138 jobs found

Senior Software Engineer / Full Stack Developer (TypeScript Node React AWS) London / WFH to £95k Are you a full stack technologist? You could be progressing your career in a hands-on Senior Software Engineer role at a well established consumer facing financial services company that help people to manage debt, as they go through a technical transformation and scale-up following recent investment. What's in it for you: Salary to £95k Bonus 25 days holiday Pension Employee Assistance Programme Onsite gym and well-being champions X2 volunteering days per year Opportunity to make an impact as part of new team in a role you can shape Your role: As a Senior Software Engineer you will design and develop customer facing applications, working across the full stack with a leaning towards TypeScript, Node and AWS on the backend but also with exposure to React on the front end, ensuring high standards of quality, security, reliability and operability across the stack. You'll also have exposure to mobile app development using React Native. Location / WFH: You'll be based in fantastic new offices in London that offer a wide range of facilities including wellness rooms and onsite gym for three days a week with flexibility to work from home twice a week. About you: You have advanced full stack development skills including TypeScript backends, microservices, APIs, React and also ideally React Native or Kotlin for mobile development You have a good understanding of distributed systems, RDBMS (Oracle) and data modelling trade-offs You have a good understanding of cloud native architecture and modern engineering practices such as CI/CD, Test Automation, monitoring and observability You have an interest in AI and agentic systems, ideally having used in a commercial setting You're collaborative and pragmatic, comfortable working closely with Product Managers to explain technical aspects and trade-offs to shape delivery plans that balance speed, quality and risk Apply now to find out more about this Senior Software Engineer / Full Stack Developer (TypeScript Node React AWS) opportunity.

Software Engineer (React) Position Description At CGI, you will play a key role in shaping intuitive, high-performing digital experiences that deliver real value to clients and end users. As a React Developer, you will contribute to building scalable front-end solutions that support business transformation and innovation across industries. Working within a collaborative and forward-thinking environment, you will have the opportunity to take ownership of your work, contribute creative ideas, and help deliver impactful outcomes. CGI empowers you to grow your expertise, work with modern technologies, and make a meaningful difference while being supported by a strong, inclusive team culture. CGI was recognised in the Sunday Times Best Places to Work List 2025 and has been named a UK 'Best Employer' by the Financial Times. We offer a competitive salary, excellent pension, private healthcare, plus a share scheme (3.5% + 3.5% matching) which makes you a CGI Partner not just an employee. We are committed to inclusivity, building a genuinely diverse community of tech talent and inspiring everyone to pursue careers in our sector, including our Armed Forces, and are proud to hold a Gold Award in recognition of our support of the Armed Forces Corporate Covenant. Join us and you'll be part of an open, friendly community of experts. We'll train and support you in taking your career wherever you want it to go. Due to the secure nature of the programme, you will need to hold UK Security Clearance or be eligible to go through this clearance. Our teams operate within a flexible hybrid working model, however on-site requirements vary by project, so the ability to travel as required to meet client needs is essential. Your future duties and responsibilities In this role, you will design, build, and enhance modern web applications using React, contributing directly to solutions that drive client success. You will take ownership of key features and components, working closely with designers, backend engineers, and product teams to translate requirements into scalable, high-quality code. You will be encouraged to deepen your technical expertise, share knowledge, and continuously improve development standards while contributing ideas that shape how solutions are delivered. You will play an important role in balancing delivery and technical development, taking responsibility for your work while being supported in progressing toward more senior responsibilities. • Develop responsive, scalable applications using React.js • Build reusable components and front-end libraries • Collaborate within cross-functional agile teams • Integrate front-end solutions with APIs and backend services • Improve application performance, accessibility, and usability • Review code quality through peer reviews and best practices • Troubleshoot technical issues effectively • Learn modern tools, frameworks, and approaches Required qualifications to be successful in this role You will bring hands-on experience in React development and modern JavaScript, with the ability to deliver high-quality front-end solutions. You should be comfortable taking ownership of your work while continuing to grow your technical depth within a collaborative team environment. • You should have commercial experience developing applications using React.js • Strong proficiency in JavaScript (ES6+) and core front-end principles • Experience with HTML5, CSS3, and responsive design techniques • Familiarity with RESTful APIs and integration patterns • Proven ability to write clean, maintainable, and testable code • Experience using Git and modern development workflows • Understanding of debugging, performance optimisation, and best practices • Ability to collaborate effectively and contribute to continuous improvement Together, as owners, let's turn meaningful insights into action. Life at CGI is rooted in ownership, teamwork, respect and belonging. Here, you'll reach your full potential because You are invited to be an owner from day 1 as we work together to bring our Dream to life. That's why we call ourselves CGI Partners rather than employees. We benefit from our collective success and actively shape our company's strategy and direction. Your work creates value. You'll develop innovative solutions and build relationships with teammates and clients while accessing global capabilities to scale your ideas, embrace new opportunities, and benefit from expansive industry and technology expertise. You'll shape your career by joining a company built to grow and last. You'll be supported by leaders who care about your health and well-being and provide you with opportunities to deepen your skills and broaden your horizons. Come join our team-one of the largest IT and business consulting services firms in the world.

Description About Engineering at Engine by Starling At Engine by Starling, we don't do "checkbox security"-we build security software. We treat security as a first-class engineering discipline, where the solution to a threat isn't a policy, but a robust, concurrent system written in Go . As a Cloud Security Software Engineer , you will be a hands-on builder responsible for the security architecture of our multi-tenant core banking platform. You'll spend your days architecting and writing Go-based tooling, automating defenses, and ensuring our infrastructure across AWS and GCP is secure by design and compliant by default. The Mission Your mission is to solve complex security problems through software engineering , focusing on three core pillars: Identity & Network Security: Engineering high-performance IAM controls and zero-trust network architectures. You will lead the way in refining edge-defense strategies and trust redirection, ensuring every request is verified and encrypted at scale. Unified Vulnerability Orchestration: Architecting a custom "single pane of glass" for security data. You will build Go-based API integrations and microservices that bridge scanning engines, dependency trackers, and internal portals into a seamless, automated ecosystem. Compliance as Code: Building the automated systems that provide real-time evidence for frameworks like SOC 2, ISO 27001 & PCI. You'll ensure we stay compliant through continuous, automated validation rather than manual overhead. The Team You will be a key member of our growing Security Engineering team, working at the intersection of Infrastructure, Cross-Cutting, and GRC. We operate like a specialized product team: we identify security friction and build the software to eliminate it. You won't work in a silo; you'll collaborate with engineers across the business to deliver a platform that is resilient by default. About You We are looking for Software Engineers who are passionate about the Go ecosystem and want to apply those skills to mission-critical security challenges. Whether you come from a Security Engineering background or you are a Backend Engineer with a "security-first" mindset, we value your ability to write clean, maintainable, and efficient code. What you'll get to do Engineering Security Tooling: Lead the design and maintenance of our internal security tool suite, written primarily in Go , to automate evidence collection and real-time remediation of security alerts. Infrastructure as Code: Write and peer-review Terraform and custom providers to manage identity and core infrastructure across AWS and GCP. Supply Chain Security: Build automated systems to manage container provenance and integrate security analysis into our CI/CD pipelines (GitHub Actions/TeamCity). Cloud Native Defense: Engineer Kubernetes security solutions leveraging Cilium , eBPF, and custom controllers to protect our microservices. Cryptographic Engineering (PKI): Build and maintain our Go-based Certificate Authority (CA) tooling and internal PKI infrastructure. Incident Response: Support the team in automated incident response, building the tools that help us investigate and mitigate threats faster. Requirements What skills are essential: Go Specialist: You are proficient in Go . You understand its concurrency models, testing patterns, and how to build idiomatic, performant services. The Builder Mindset: You find manual work a personal affront. If a task needs to be done twice, you've already started planning the automation for it. Cloud Native: Practical experience with AWS or GCP, ideally managed through Terraform . Container Expertise: You understand Kubernetes internals-from the runtime security to the service mesh. Identity & Networking: Strong understanding of cloud identity models and network protocols. What skills are desirable: Experience with Cilium or eBPF-based security monitoring. Knowledge of Sigstore/Cosign , image provenance, and SBOMs. Familiarity with hardware security modules (HSMs) or advanced cryptography. Cloud-native security certifications (AWS/GCP). Benefits 33 days holiday (including public holidays, which you can take when it works best for you) An extra day's holiday for your birthday Annual leave is increased with length of service, and you can choose to buy or sell up to five extra days off 16 hours paid volunteering time a year Salary sacrifice, company enhanced pension scheme Life insurance at 4x your salary & group income protection Private Medical Insurance with VitalityHealth including mental health support and cancer care. Partner benefits include discounts with Waitrose, Mr&Mrs Smith and Peloton Generous family-friendly policies Incentives refer a friend scheme Perkbox membership giving access to retail discounts, a wellness platform for physical and mental health, and weekly free and boosted perks Access to initiatives like Cycle to Work, Salary Sacrificed Gym partnerships and Electric Vehicle (EV) leasing

£65,000 - £80,000 (flexible depending on experience) We are looking for an experienced Senior Software Engineer to join a growing technology business. This opportunity has been created due to continued growth and increasing demand for scalable, cloud-based solutions across the organisation's product portfolio. The company is focused on building modern, high-performance platforms that enable clients to solve complex operational challenges through data-driven technology. Their systems are designed to support high-volume environments while maintaining reliability, scalability, and long-term maintainability. This role will suit someone who enjoys working in a collaborative engineering environment and wants to contribute both technically and strategically to the evolution of a modern software platform. Key Responsibilities Designing, developing, and enhancing scalable backend systems and cloud-native services Contributing to architectural decisions to ensure systems remain secure, resilient, and maintainable Developing and integrating APIs to support internal and external platform functionality Working closely with product, engineering, and operational teams to deliver robust technical solutions Driving improvements in code quality, engineering standards, and delivery processes Supporting production environments, troubleshooting complex issues, and improving system observability Mentoring and supporting other engineers within the team Key Skills Strong industry experience designing and delivering scalable cloud-based software systems High proficiency in C# and solid experience across the .NET ecosystem Experience building distributed or high-throughput systems in production environments Strong understanding of modern software engineering practices including CI/CD, automated testing, and DevOps principles Experience contributing to system architecture and technical leadership within teams Excellent problem-solving and debugging capabilities Desirable Skills Experience working within product-led or scaling technology organisations Exposure to containerisation, cloud optimisation, or infrastructure-as-code Experience improving legacy platforms or leading modernisation initiatives Understanding of performance engineering or reliability-focused system design What you get in return Salary £65,000 - £80,000 depending on experience Flexible hybrid working (3 days onsite / 2 remote) Generous annual leave allowance Professional development support and learning opportunities Enhanced family-friendly policies Health and wellbeing support Pension scheme and additional lifestyle benefits Regular team and social activities Cycle to Work scheme This company is an equal opportunity employer and values diversity. They do not discriminate on the basis of race, religion, gender, sexual orientation, age, disability, or background. Interested? Please submit your CV to Chrissie Rehman via the application link provided. Alternatively, you can contact directly to discuss the role in more detail. DCS Recruitment and all associated companies are committed to creating a working environment where diversity is celebrated and everyone is treated fairly, regardless of gender, gender identity, disability, ethnic origin, religion or belief, sexual orientation, marital or transgender status, age, or nationality

White Collar Factory (95009), United Kingdom, London, London Lead Software Development Engineer - Services About this role Capital One's mission is to change banking for good by bringing humanity, ingenuity and simplicity to banking. Sitting at the core of such values is our Software Engineering department whose primary role is to be an enabler of our ambitions. Capital One is looking for a Senior Software Development Engineer to join a backend team, based in our London office on a hybrid basis. Our Engineers are people who lead by example, build strong and valuable relationships and have the confidence to influence at all levels. We are proud of who we are and what we do and want you to join us at this particularly exciting time at Capital One. What you'll do You will lead a team or cross-functional squad in the delivery of complex and ambiguous projects that support a broader business outcome You will take end-to-end responsibility for technical design, implementation, and operational considerations Collaborate with engineers, architects, product owners, and stakeholders to ensure successful project outcomes You will play a crucial role in supporting the elevation of engineering enablement, excellence, and experience across the broader engineering community You will collaborate and contribute to the development and dissemination of standardised and sustainable best practices, tools, patterns, and frameworks that enhance the productivity and quality of engineering efforts business-wide Your focus is on a major portion of existing or new team software (e.g., significant component, set of features, mid-size application or service) You'll work to achieve the goals and vision shared by Product Management and your Tribe Leadership Innovate within your team, initiative area and contribute within your technical domain What we're looking for Proven experience in technical leadership, including leading a team or cross-functional squad Proven experience working in both backend services and mobile technologies Exceptional programming skills and knowledge of building APIs using modern OO languages preferably Java, SOLID principles, SOA, HTTP and REST Experience with AWS and strong understanding of cloud-based development Extensive, demonstrable knowledge of designing architectures that are secure and perform at scale You're able to effectively communicate and work collaboratively across engineering to maximise inner-sourcing opportunities and reduce waste Proven experience ability to deliver high quality applications at scale An advocate for quality and the ability to support the team, leveraging approaches such as Pair Programming, TDD and BDD Where and how you'll work This is a permanent position and will be based in our London office. We have a hybrid working model which gives you flexibility to work from our offices and from home. We're big on collaboration and connection, so you'll be based in our London office 3 days a week on Tuesdays, Wednesdays and Thursdays. What's in it for you Bring us all this - and you'll be handsomely rewarded with a role contributing to the product roadmap for an organisation committed to transformation We're continuing our journey into the public cloud and have problems of scale, security, availability and performance for you to help solve We love continuous learning and that's why we give you 10% of your time to work on cutting edge innovative projects that shape the way we will work in the future We offer high performers strong and diverse career progression, investing heavily in developing great people through our Capital One University training programmes (and appropriate external providers) Immediate access to our core benefits including pension scheme, bonus, generous holiday entitlement and private medical insurance - with flexible benefits available including season-ticket loans, cycle to work scheme and enhanced parental leave Open-plan workspaces and facilities designed to inspire and support you. Our Nottingham head-office has a fully-serviced gym, subsidised restaurant, mindfulness and music rooms. In London, you can heighten your mood with a run on our rooftop running track or an espresso at the Workshop Coffee café What you should know about how we recruit We are committed to creating a level playing field and seek to create teams that are representative of our customers and the communities we serve. We'd love to hear from you if you identify with a typically under-represented group in our industry and are particularly keen to hear from women and ethnic minority candidates. We pride ourselves on hiring the best people, not the same people. Building diverse and inclusive teams is the right thing to do and the smart thing to do. We want to work with top talent: whoever you are, whatever you look like, wherever you come from. We know it's about what you do, not just what you say. That's why we make our recruitment process fair and accessible. And we offer benefits that attract people at all ages and stages. We also partner with organisations including the Women in Finance and Race At Work Charters, Stonewall and upReach to find people from every walk of life and help them thrive with us. We have a whole host of internal networks and support groups you could be involved in, to name a few: REACH - Race Equality and Culture Heritage group focuses on representation, retention and engagement for associates from minority ethnic groups and allies OutFront - to provide LGBTQ+ support for all associates Mind Your Mind - signposting support and promoting positive mental wellbeing for all Women in Tech - promoting an inclusive environment in tech EmpowHER - network of female associates and allies focusing on developing future leaders, particularly for female talent in our industry Capital One is committed to diversity in the workplace. If you require a reasonable adjustment, please contact All information will be kept confidential and will only be used for the purpose of applying a reasonable adjustment. For technical support or questions about Capital One's recruiting process, please send an email to Capital One does not provide, endorse nor guarantee and is not liable for third-party products, services, educational tools or other information available through this site. Capital One Financial is made up of several different entities. Please note that any position posted in Canada is for Capital One Canada, any position posted in the United Kingdom is for Capital One Europe and any position posted in the Philippines is for Capital One Philippines Service Corp. (COPSSC). Who We Are At Capital One, we're building a leading information-based technology company. Still founder-led by Chairman and Chief Executive Officer Richard Fairbank, Capital One is on a mission to help our customers succeed by bringing ingenuity, simplicity, and humanity to banking. We measure our efforts by the success our customers enjoy and the advocacy they exhibit. We are succeeding because they are succeeding. Guided by our shared values, we thrive in an environment where collaboration and openness are valued. We believe that innovation is powered by perspective and that teamwork and respect for each other lead to superior results. We elevate each other and obsess about doing the right thing. Our associates serve with humility and a deep respect for their responsibility in helping our customers achieve their goals and realize their dreams. Together, we are on a quest to change banking for good.

We are looking for a highly motivated Software Engineer to join a well established digital solutions company based in Stonehouse, Gloucestershire. 35,000 - 40,000 - hybrid working - Immediate start! They are looking for someone who enjoys solving problems, takes pride in their work, and is keen to learn and grow. Languages and Frameworks: TypeScript JavaScript React Angular HTML/SCSS C# Daily responsibilities: Developing new features and enhancements for their platform Building modern frontend applications using Angular and React Contributing to backend development, using C# Working on bespoke development tasks for customer requirements and internal projects Writing clean, maintainable, and well-tested code Creating unit tests and automated end-to-end tests Using source control to manage and maintain code effectively Working within an Agile environment and participating in team meetings Collaborating with engineers, designers, and product owners Contributing across the full software development lifecycle What we're looking for: Essential: Frontend development experience through a commercial role Experience with JavaScript or TypeScript Experience with a modern frontend framework (React/Angular preferred, but not essential) Good understanding of HTML and CSS / SCSS Willingness to learn backend development Ability to independently problem solve, but also the temperament to work collaboratively within a team Desirable: Experience with React/Angular Experience with C# or backend development A relevant degree Full, clean driving licence Experience with agile development methodologies What we offer Mentorship and support from experienced engineers The opportunity to work on real features used by real customers The chance to develop full-stack development skills A friendly, supportive, and collaborative team environment Opportunity to progress into a senior software developer position This role will require you to work on a hybrid basis 3 days per week in the office in Stonehouse so you must be commuting distance from that location. Sponsorship will not be provided for this position. We are interviewing currently so apply now for immediate consideration for the Software Engineer position or contact Stuart Barnes at ITSS Recruitment for further information.

Senior Developer Senior Software Engineer C#, .Net, Typescript, JavaScript Hybrid, 1-2 days near Liverpool Street Salary, 85,000 to 95,000 + benefits If you enjoy solving complex engineering problems, learning from highly capable peers, and working on a product where your contribution genuinely matters, please read on. We're hiring for a growing, well-funded SaaS business building a sophisticated, data-driven platform that helps organisations understand and manage complex information at scale. The company is in an early investment phase with strong growth ambitions, offering real scope for progression and the chance to help shape both the product and engineering direction. You'll be part of a bright, collaborative team of talented software engineers and academically strong problem-solvers who value clean design and thoughtful architecture. The Role As a Full Stack Engineer, you'll design and deliver features across a modern stack, working on scalable backend services and intuitive front-end applications that present complex data clearly. Key Responsibilities: Building full-stack features using C#, .NET and TypeScript/React Developing scalable backend services for complex data workflows Creating responsive, user-friendly interfaces Exploring new technologies and contributing to technical improvements Working collaboratively in an agile engineering environment Essential Skills & Experience Strong commercial experience as a Software Developer or Full Stack Engineer 5+ years experience with C# / .NET and modern JavaScript or Typescript (React preferred) Strong problem-solving ability and a collaborative mindset A Bachelor's degree in Computer Science or Software Engineering. 2.1 or above Why Join? Technically challenging, data-driven SaaS product Strong investment for growth Work alongside a highly capable and intellectually strong team Excellent learning opportunities and clear progression as the company grows If you're looking for a role where you can learn quickly, tackle interesting technical challenges, and grow with an ambitious product business, hit apply ! Spectrum IT Recruitment (South) Limited is acting as an Employment Agency in relation to this vacancy.

Picture your next role as a Senior Backend Developer You walk into a team where most developers stayed for years. People know the platform, trust each other, and care about the work. No chaos. No constant churn. A steady engineering team that builds solid software. You focus on backend engineering. C#, .NET, Azure. You work on cloud systems that run across the business. The team improves platforms, builds new services, and keeps raising the standard. Senior developers here solve problems, share knowledge, and take ownership of the platform. Your role: Build backend services using C# and .NET Develop APIs and system integrations Deploy and run services in Azure Improve performance and reliability across the platform Contribute to CI/CD and automation Work with engineers, product managers, and UX Why Developers stay there: Chance to work with experienced developers who care about quality Contribute to real improvements across production systems Stable environment with long serving engineers 34 hour working week Quick Interview process, 2 stage interview. If you want a stable engineering team, strong technical work, and space to grow as a backend developer, apply now . Senior .NET Backend Developer, C#, .NET, Azure, Winsford, 1 day in office, Salary up to 75,000

Location: Tring (Predominately onsite with flex where project allows) Duration: 4-6 month contract IR35: Outside IR35 Role detaills: Our client, a leading entity in the Defence & Security sector, is seeking a highly motivated Senior Software Engineer to join them on a contract basis - The role will encompass the design and development of a web-based control and monitoring dashboard application for an antenna terminal system. Key Responsibilities: Design and develop a web-based control and monitoring dashboard application for an antenna terminal system. Engage in the full design life cycle from specifications generation to thorough regression testing of pre-production units. Build and maintain React/Next.js frontend applications and NestJS backend services within a shared pnpm monorepo environment. Integrate user-facing components with backend services using various communication protocols (REST, WebSockets, SNMP, MQTT, etc.). Develop the GUI using a mix of off-the-shelf UI components and custom modules. Ensure the UI code is well-structured, scalable, and testable, conforming to UX/architecture guidelines. Ensure compliance with modern accessibility standards and usability best practices across browsers and devices. Contribute to software architecture, project planning, and specification documentation. Job Requirements: Proficiency in frontend technologies including HTML5, CSS3, JavaScript, TypeScript, React, and Next.js. Experience with backend services using NestJS and related TypeScript tooling. Understanding of various communication protocols like TCP/IP, HTTP, and SNMP. Experience with containerization tools such as Docker. Ability to design, implement, integrate, and verify software applications on Linux and Windows OS. Proven product development experience from concept through deployment. Familiarity with networked applications that require low-latency and high-availability. Preferred Experience: Knowledge of communication systems design. Understanding of various communication protocols, including RS-232, I2C, CAN, SPI, USB, TCP, and UDP over IP. Familiarity with databases, web servers (e.g. Apache), and UI/UX design. Interested? Apply today via the link provided!

Senior Software Engineer (Full Stack - Angular Focus) 55,000 - 65,000 + package Cardiff (onsite approx. once/twice per month) Eligible for Security Clearance (must have resided in the UK for the last 5 years) CPS Group are working with a leading organisation to recruit a Senior Software Engineer to join a highly skilled, collaborative engineering team delivering enterprise-scale solutions in an agile environment. This is a full-stack role with a strong emphasis on frontend development. You'll be working primarily with Angular, which is essential for this position, while also contributing to backend services as the platform evolves. While Java experience is beneficial, this is not a pure Java role. Backend experience in Java or a similar language is required, with the expectation that Java will feature more prominently at certain stages of development. Key Responsibilities Design, build, and maintain high-quality frontend applications using Angular Contribute to full-stack development across modern, scalable systems Collaborate with backend engineers on API design and integration Work across the full software development lifecycle with a DevOps mindset Apply best practices including CI/CD, automated testing, and clean code principles Operate within an agile team, contributing to continuous improvement and technical decisions Ensure solutions meet security, performance, and quality standards Key Skills Required Strong commercial experience with Angular (essential) Full-stack development experience Backend experience using Java or a similar server-side language Understanding of modern software engineering best practices Experience working in agile delivery teams Familiarity with CI/CD pipelines (desirable) Exposure to cloud or containerised environments (beneficial, not essential) Contact: Zach Bennett - CPS Group Contact: Zach Bennett - CPS Group By applying to this advert you are giving CPS Group (UK) Ltd authority to hold and process your data for this specific role and any other roles we may deem suitable to you over time. We will not pass your data to any third party without your verbal or written permission to do so. All incoming and outgoing calls are recorded for training and compliance purposes. CPS Group (UK) Ltd is acting as an Employment Agency in relation to this vacancy. Our new privacy policy can be found here (url removed)

SRT Marine Systems plc (SRT) is a market leader in the domain of international marine surveillance technology and systems. We are a respected, established, and an ambitious multi-national company headquartered in the UK with a global customer base. The company has a worldwide impact in the marine sector by leading the next generation of Maritime Domain Awareness technologies "MDA", products, and systems that significantly enhance security, safety, environmental protection, and sustainability. Our customers are global and range from the largest national coast guards to individual vessel owners. SRT is an exciting company where high-quality results are rewarded. We are ambitious and constantly seek to innovate in order to deliver better products and services to our customers. We strive to make SRT a rewarding and challenging place to work, where talented, hard-working individuals have the opportunity to make a real impact across the marine industry. Role overview of our Senior Software Tester As a Senior Software Tester you will work on the continued build of our Marine Domain Awareness (MDA) platform which is used to create an operational picture of maritime activity. Our systems ingest large volumes of streaming data from both satellite and terrestrial, along with other sensor sources. You will play a key role in validating the behaviour of a distributed, event-driven system operating on real-time maritime data. Testing activities include both automation and manual testing. The role of Senior Software Tester role is a hybrid working position based from our Cardiff office, you will be required to attend office 1 day per week as per the team's requirements. How We Work Sprint Work Developmenttickets move across the Jira board through the delivery workflow Tickets reaching the Test stage are assigned to a tester Testers validate functionality using a mix of automated and manual testing approaches QA Release Cycles Every six weeks, we conduct a dedicated two-week QA phase where: Testers pause normal sprint board work The focus shifts to release-wide regression testing Both manual and automated test suites are executed to validate the full platform Senior Software Tester - Responsibilities (not exhaustive): Test new features and improvements delivered during sprint cycles Design, implement, and maintain automated tests, along with the execution of manual exploratory and regression testing when required Validate message-driven workflows across distributed services Test REST API endpoints supporting CRUD operations within the system Participate in release regression cycles and help validate production-ready builds Investigate issues, reproduce defects, and provide clear bug reports Work closely with developers and product teams to clarify requirements and ensure testability Senior Software Tester - Required Skills and Experience Strong experience as a software tester or QA engineer Experience testing complex distributed systems or backend platforms Experience creating automated tests Familiarity with tools such as Postman (or similar API testing tools) Ability to write test scripts using one or more scripting languages (e.g. Python, JavaScript, Bash) Ability to understand system behaviour through logs, messages, and APIs Strong debugging and problem-solving skills Experience working within Agile / Scrum teams Familiarity with Jira or similar issue-tracking tools Company Benefits Highly Competitive Salary and Pension Hybrid Working Development opportunities SRT Marine Systems plc are an equal opportunity employer. We are committed to creating an inclusive working environment for all employees and actively encourage applications from all sectors of the community.

Senior Software Engineer - AI SaaS Platform London (Hybrid - 2 days onsite) £90,000 - £110,000 + bonus + benefits A high-growth B2B generative AI scale-up based in central London is looking for a Senior Software Engineer to help build the next generation of its AI-powered SaaS platform. Working within a fast-moving product engineering team, you will play a key role in designing and delivering new features that enhance how customers interact with AI-driven software. This is a product-led environment where engineers collaborate closely with product managers and designers to ship high-impact features and continuously improve the platform. This role would suit an experienced engineer who enjoys building scalable systems, working across the full stack, and contributing to a product used by real customers. Key Responsibilities Design and deliver scalable features within a modern SaaS platform Build reliable backend services and customer-facing functionality Work closely with Product Managers and Designers to refine requirements and deliver solutions Contribute to system design, architecture discussions and engineering best practices Support the reliability and scalability of live production systems Required Experience Strong TypeScript / Node.js development experience Experience building full-stack applications (React / Next.js) Experience delivering cloud-based products in AWS, GCP or Azure Infrastructure knowledge such as Terraform, Docker, Kubernetes or CI/CD pipelines Experience working in startup or scale-up environments A product mindset with strong collaboration across engineering, product and design teams Nice to Have Experience using Python within product development Exposure to AI / LLM-driven products Experience with microservices architectures What s on Offer £90,000 £110,000 base salary Bonus scheme Hybrid working (2 days per week in London) Flexible working hours Private healthcare & pension Strong progression opportunities within a high-growth AI scale-up The opportunity to work on cutting-edge AI products used by global customers If you are a Senior Software Engineer looking to work on impactful AI-driven products in a fast-growing scale-up, apply now for more information.

Founding Engineer (EnergyTech / AI) London Hybrid (3 days onsite) 70k- 120k + Equity A venture-backed EnergyTech start-up is building a new type of power company designed for the electrified future. As renewable energy adoption accelerates, the challenge is no longer just generating power, but storing, managing, and intelligently dispatching it. This team is developing software that sits at the centre of that transition, enabling a new generation of energy suppliers built around flexibility, storage, and intelligent automation. Backed by leading investors and founded by operators with experience from some of the most respected names in the European energy ecosystem, the business has already launched its first product and is growing rapidly month-on-month. The next phase is building the core technology platform that will power a fully integrated energy supplier launching later this year. This is an opportunity to join a small, highly capable engineering team building core infrastructure for a next-generation energy platform. The Role You will work across the full product stack, helping design and build the systems that power both the customer experience and the operational backbone of the platform. Engineers here take ownership of problems end-to-end, from shaping early ideas through to delivering production features used by customers. Responsibilities include: Building full-stack product features across web, backend services and data systems Designing APIs and integrating with hardware and energy data platforms Developing AI-enabled capabilities, including LLM-powered workflows and operational tooling Contributing to core supplier infrastructure such as billing systems, operational tooling, and internal platforms Working closely with founders and customers to shape the product direction Tech Stack Frontend: React, React Native, TypeScript Backend: Python, FastAPI, PostgreSQL Infrastructure: GCP, Terraform, Airflow AI: LLM integrations and AI-driven automation What They're Looking For Experience as a Full-Stack Engineer building production systems Strong engineering fundamentals and the ability to work across backend and frontend systems Comfort operating in a fast-moving start-up environment where priorities evolve quickly A proactive mindset with a bias towards ownership and solutions Interest in the energy transition or climate technology is a strong plus Engineers who thrive here tend to enjoy working close to the problem, communicating clearly across technical and non-technical teams, and taking initiative rather than waiting for direction. Package 70k- 120k salary depending on experience Meaningful equity Private health insurance Meal allowance and team dinners Hybrid working (London office 3 days per week)

Senior Python Developer (Contract) 600 - 700 PD (Inside IR35) 6 Months Contract London Hybrid Overview We are seeking an experienced Lead Python Software Engineer. You will lead the technical architecture and delivery , ensuring reliable system synchronisation, improved data consistency, and scalable solutions for an amazing brand. Role & Responsibilities Lead the architecture and technical delivery of the solution Develop backend services and APIs , with occasional frontend contributions where needed Implement reliable system integrations and data synchronisation Work within established architecture patterns and engineering standards Collaborate with engineers, product managers, and other stakeholders Communicate technical decisions clearly and maintain high engineering standards Essential Skills & Experience Strong experience with Python and TypeScript Strong AWS experience (ECS, Lambda, Step Functions, API Gateway) Experience managing infrastructure with Terraform Proven experience architecting and delivering software solutions Experience integrating with third-party APIs or vendor systems Experience with data synchronisation or complex system integration Strong communication skills and ability to work effectively within existing teams Desirable - React / Next.js frontend experience

Back End Software Engineer - SC Cleared Contract Remote (occasional London travel) 450/day (inside IR35) We're recruiting on behalf of a major government technology programme for a senior software engineer to help design and evolve high-performance, cloud-based systems that support critical public services. This is a hands-on technical role with real influence - you'll contribute to architecture decisions, mentor colleagues, and own complex integrations end-to-end. Working within an Agile squad, you'll lead technical design discussions, manage CI/CD pipelines, and play an active role in incident and change management, all within a modern Azure cloud environment. What you'll need Angular - component architecture and state management Node.js - async programming and API/backend services Azure - designing and managing scalable cloud infrastructure Terraform - infrastructure as code and environment automation Jenkins - CI/CD pipelines and automated testing Git - branching strategies and collaboration workflows Jira & Confluence - Agile delivery and documentation Current active SC Clearance

Senior Full Stack Engineer PHP, Laravel, JavaScript, Vue.js Weekly visits to South Gloucestershire Salary Range: 50-70k Would you like to spend your day job helping reshape how homes across the UK consume energy? These opportunities don't come around often. I'm working with an early-stage start-up building next-generation clean energy solutions that will significantly reduce carbon consumption in households nationwide. They're currently in the pre-production stage, with an exceptional founding team already in place, and are now looking to bring in a Senior Full Stack Engineer to work closely alongside their Founding Software Engineer. Together, you'll play a key role in shaping and building multiple customer-facing interfaces, ensuring users can seamlessly interact with their product and maximise its benefits. This is a chance to influence both the technical direction and the end-user experience from the ground up. It's an incredibly exciting time to join. The business is on the cusp of major growth, and this is a genuine opportunity to leave a lasting legacy on a product set that's about to scale rapidly across the UK. We're looking for someone with full stack experience across PHP, Laravel, JavaScript (or TypeScript) & Vue.js. This is perfect for someone who wants to combine environmental impact with the thrill of building something from scratch. What you'll need Strong commercial experience across the PHP, Laravel, JavaScript/TypeScript & Vue.js Any experience with Golang & AWS would be beneficial but not essential Comfortable across both backend & frontend development, but can have a lean towards frontend development Experience in a small or early-stage start-up environment or ability to operate in such an environment A passion for environmentally-focussed products or developing clever solutions for society-wide issues Enthused by the opportunity to leave a legacy on significant products that you will be developing for users! Able to commute to South Gloucestershire on a weekly business when required Click the 'apply' button now to find out some more!

Senior Software Engineer (C# .NET, WPF, Desktop Applications) Location: Derby (On-Site Working) Salary: £55,000 - £70,000 + Benefits Overview Senior Software Engineer to design, develop and maintain a high-performance desktop application platform used for real-time monitoring, control and data visualisation in industrial environments. This role is ideal for an experienced engineer with strong expertise in C#/.NET and WPF, particularly in building responsive, real-time desktop applications. You will take ownership of the full software development lifecycle, from architecture and design through to release and ongoing optimisation. Working closely with embedded, electrical and mechanical engineering teams, you will deliver a robust, scalable and safety-aware operator interface. Key Responsibilities Software Architecture & Development Design and maintain desktop application architecture using C# (.NET) and WPF (MVVM pattern) Develop high-performance, real-time software systems with a focus on responsiveness and reliability Implement clean, maintainable code following SOLID principles and Clean Architecture Apply common design patterns (MVVM, Factory, Observer, Strategy, Decorator, Dependency Injection) Desktop & Backend Functionality Develop Windows Services for background processing, monitoring and lifecycle management Build real-time data visualisation dashboards and charting tools for live system telemetry Implement structured logging, telemetry and reporting for compliance and diagnostics Manage local data storage using SQLite, including secure/encrypted data handling Networking & Real-Time Systems Develop and optimise high-performance networking using TCP/UDP protocols Handle real-time communication with multiple distributed devices/systems Implement asynchronous and concurrent data processing Design fault-tolerant systems, including failover and degraded-mode operation Work with IPv4/IPv6, multicast and unicast communication models Performance & Quality Profile and optimise applications for CPU, memory and network performance Use tools such as Visual Studio Profiler, dotTrace, dotMemory and Wireshark Implement unit testing (xUnit/NUnit), TDD practices and code coverage Participate in code reviews and collaborative development workflows using Git Work in a trunk-based development environment with semantic versioning Skills & Experience Required Degree in Software Engineering, Computer Science or equivalent experience Strong commercial experience in C#/.NET development (preferably .NET 6+) Proven expertise in WPF desktop application development using MVVM Experience building real-time, high-performance or data-intensive applications Strong knowledge of network programming (TCP/UDP, sockets, async I/O) Solid understanding of software architecture principles and design patterns Experience with performance profiling and optimisation Proficiency with Git and modern development workflows Experience with unit testing frameworks (xUnit, NUnit) and TDD practices Strong problem-solving, communication and collaboration skills Desirable Skills Experience with industrial communication protocols (Modbus/TCP, RS232/RS422/RS485) Knowledge of Windows Services development Experience with SQLite and encrypted data storage Familiarity with data visualisation frameworks and UI styling (e.g. Material Design) Understanding of industrial systems or hardware-integrated software Ability to interpret electrical or mechanical engineering drawings

Senior RF Data Scientist / Research Engineer Near Cambridge My client, a fast-growing AI company based near Cambridge, is seeking a Senior RF Data Scientist / Research Engineer to work at the intersection of RF hardware, digital signal processing, and machine learning. This hands-on R&D role involves analysing complex RF datasets, developing advanced signal-processing pipelines, and contributing to cutting-edge UAV/drone detection technologies. You will play a key role in prototyping new sensing capabilities, working with SDRs, designing real-world RF experiments, and integrating machine-learning models into early-stage hardware software systems. This position is ideal for someone who thrives in fast-paced, iterative prototyping environments. Key Responsibilities Analysing raw IQ data from SDR platforms (e.g., bladeRF, USRP) to extract, classify, and interpret RF signal features Building diagnostic RF analysis tools (time frequency plots, cyclic spectra, EVM, autocorrelation, constellation tracking, etc.) Designing RF data-processing pipelines built around practical hardware constraints (bandwidth, ADC limits, gain stages, timing jitter) Modelling RF front-end behaviour (filters, mixers, LOs, AGC, noise figure) to improve signal integrity and inference accuracy Developing ML and statistical models for RF classification, anomaly detection, and emitter identification Prototyping real-time or batch-processing systems in Python (NumPy, SciPy, PyTorch) with potential integration via ZMQ, GNU Radio, or C++ backends Leading RF data collection, field experiments, and over-the-air testing using drones, wireless devices, and custom transmitters Requirements Strong Python proficiency for RF data analysis and prototyping (NumPy, SciPy, matplotlib, scikit-learn, PyTorch) Solid understanding of DSP fundamentals (FFT, filtering, modulation, correlation, noise modelling, resampling) Familiarity with SDR frameworks such as GNU Radio, SDRangel, osmoSDR, or SoapySDR Practical understanding of RF hardware chains (antenna filters mixers ADC) and their impact on baseband data Experience analysing wireless protocols (Wi-Fi, LTE, LoRa, etc.) and physical-layer structures Comfortable debugging SDR setups and performing field-based RF data collection Strong communication skills and ability to work effectively within an iterative R&D team Desirable Hands-on experience with SDRs (bladeRF, HackRF, USRP, PlutoSDR) and RF lab equipment (spectrum analysers, VNAs, signal generators) Experience in passive radar, beamforming, TDoA, Doppler, or direction finding Familiarity with embedded or real-time systems (FPGA pipelines, GPU acceleration, etc.) Programming experience in MATLAB, C++, Rust, or similar languages Knowledge of RF circuit principles (impedance matching, filter design, gain budgeting) Experience designing or testing antenna arrays for sensing/detection Publications, patents, or open-source RF/ML contributions Role Details Location: Cambridge area (onsite or hybrid depending on project needs) Department: Research & Prototyping Team Impact: Direct involvement in early-stage hardware software product development Interested? Please Click Apply Now! Senior RF Data Scientist / Research Engineer Near Cambridge

Lead C# Backend Developer Location: Central London (Onsite) Salary: 75,000 - 85,000 Type: Permanent Sponsorship: Not available (must be UK-based) Overview We are working with an established software house based in Central London who are looking to hire a Lead C# Backend Developer to join their growing engineering team. This is a fully onsite role, ideal for someone who thrives in a collaborative environment and enjoys working closely with both technical and non-technical stakeholders. Role & Responsibilities Lead the design and development of scalable backend systems using C# and .NET Framework Provide technical leadership and mentorship to a team of developers Take ownership of backend architecture and ensure best practices are followed Work closely with cross-functional teams including front-end, QA, and product Contribute to system design, performance optimisation, and code quality Participate in code reviews and promote clean, maintainable coding standards Troubleshoot and resolve complex technical issues Key Requirements Strong commercial experience with C# and .NET Framework Deep understanding of backend development principles and architecture Strong experience working with SQL and relational databases Proven experience in a Lead or Senior Developer position Experience building scalable, high-performance applications Strong understanding of software design patterns and best practices Excellent problem-solving and communication skills Desirable Skills Experience with modern .NET (Core / .NET 6+) Exposure to cloud platforms (Azure preferred) Experience working in an Agile environment Additional Information This role is fully onsite in Central London Candidates must already be UK-based and have the right to work in the UK (no sponsorship available) Opportunity to join a well-established software business with a strong technical team If you are a hands-on Lead Developer looking for your next challenge in a fast-paced environment, please apply or get in touch for more information.

Senior Software Engineer (Backend) Series A eCommerce x Fintech Meaningful equity Buying clothes online still isn t a great experience. Sizing is inconsistent, returns are costly, and customers are often left guessing. Yet despite all the innovation in eCommerce, this problem remains largely unsolved. We re working with a high-growth, well-funded Series A startup that s changing that enabling Try Before You Buy experiences for leading fashion retailers. The product is live, gaining traction, and now entering a critical phase of growth, including expansion into the US. To support that, they re rebuilding and scaling key parts of their platform. This is where you come in. You ll join a small, experienced engineering team and work directly with the CTO on the systems that sit at the heart of the product. This isn t about maintaining legacy code or picking up tickets. It s about building, improving, and scaling a platform that directly impacts customer experience and revenue. The environment is backend-leaning, built around Node.js, TypeScript and MongoDB, with an API-first, event-driven approach. But more important than the stack is the mindset engineers here are trusted to take ownership, think in systems, and deliver end-to-end. You ll be given the space to focus, the autonomy to make decisions, and the responsibility to get things into production quickly and properly. What they re looking for is someone who has seen scale or at least understands what it takes to get there. Someone who has worked in a startup or high-growth environment, where ambiguity is normal and ownership isn t optional. You ll likely be strongest on the backend, comfortable designing and building production systems, and thoughtful about performance, trade-offs, and long-term maintainability. You don t need to know everything, but you do need to be curious, pragmatic, and capable of figuring things out. If you ve had exposure to eCommerce, payments, or marketplace platforms, that s helpful but not essential. What makes this opportunity stand out is timing. The team is still small, but not at zero. The product is live, but not finished. The business has funding, traction, and a clear direction but plenty left to build. There s a genuine opportunity here to shape both the platform and your own role as the team grows over the next months. And importantly, you ll be part of that journey in a meaningful way, with equity that reflects early-stage impact and upside . The package includes a salary up to £85,000, flexible holiday, hybrid working (one day in the office per week), and a range of additional benefits but the real value here is the chance to build something that matters, in a team where your contribution is visible from day one. If you re an engineer who enjoys building real products, solving meaningful problems, and working in an environment where ownership and impact matter more than process, this is worth a conversation. Apply or get in touch for a confidential discussion. EHS Partners Limited, Edison Hill Search & Edison Hill Scale are operating and advertising as an Employment Agency for permanent positions and as an Employment Business for interim / contract / temporary positions. EHS Partners Limited are an Equal Opportunities employer and we encourage applicants from all backgrounds. Please apply below at your earliest convenience.