2721 jobs found

In Short: Our Direct to Consumer business is performing and growing strongly, which is why we - within the Commercial Platform team at On - are looking for a Senior Backend Engineer to scale On's online business to the next level. As an experienced engineer, you will be responsible to design, build, deploy, test and operate our digital services. You will be sitting in our office in London and collaborating closely with the cross-functional Digital teams across our key locations. The Senior Software Engineer role will report to the relevant Senior Lead - Engineering Manager within Commercial Technology. Your Mission As a Senior Backend Engineer in our Commercial cluster, you will be at the heart of On's digital ecosystem. You will design, build, and scale the critical services that power our global e-commerce platform, B2B partner portals, and retail experiences. Your work will directly impact how we deliver product information, checkout process and end-to-end e-com user experience, to our customers and partners, ensuring a seamless and premium experience that drives our commercial success. What You'll Do Design, develop, and maintain robust and scalable backend services using our modern tech stack, with a primary focus on NestJS, TypeScript, and GraphQL. Take ownership of key components within our Commercial cluster, ensuring they are performant, reliable, and meet the needs of various client applications (web, mobile, and third-party integrations). Collaborate closely with frontend engineers, product managers, and other stakeholders to deliver end-to-end features. Agentic engineering, comfortable using AI in your daily workflow. Deploy and operate your services in a cloud-native environment on Google Cloud Platform (GCP), using Kubernetes and Docker. Engage with and contribute to our distributed systems landscape, helping to build resilient systems that can handle our growing scale. Your Story A strong background in backend development, with proven experience building and shipping high-quality software. Proficiency in Node.js and TypeScript, with a deep understanding of modern backend frameworks. Hands-on experience with NestJS is a significant advantage. Solid experience in designing, building, and consuming GraphQL APIs. Strong knowledge of relational databases (e.g., PostgreSQL) and data modeling. Hands-on experience with cloud platforms (GCP is a plus) and containerization technologies (Docker, Kubernetes). You are a collaborative team player with excellent communication skills, comfortable working in an agile environment. Bonus points for experience with: ORM tools like MikroORM Event-driven systems (e.g., Kafka, BullMQ, Pub/Sub) E-com ecosystems Your Team: As you might expect from a running brand, the wider E-commerce team at On is a fast-paced place to be. You will work in the diverse Commercial Technology domain, collaborating with Software Engineers, QA Engineers, Product Managers, Data Analytics, Marketing and others of stream-aligned or platform teams that are located inthe Berlin, Zurich and London. What We Offer At On, we are a team of explorers, dreamers, and innovators. We live and breathe our mission to ignite the human spirit through movement. We offer a dynamic, fast-paced, and collaborative environment where you can make a real impact. You'll be surrounded by passionate and talented colleagues, with plenty of opportunities for professional growth and development. On is an Equal Opportunity Employer. We are committed to creating a work environment that is fair and inclusive, where all decisions related to recruitment, advancement, and retention are free of discrimination.

TechTree in London is seeking a Senior Backend Engineer to design and scale robust backend systems for an AI-enabled financial platform. You will build high performing services, optimize data pipelines, and ensure enterprise grade security and compliance while collaborating with ML engineers and product teams. You will mentor junior engineers, drive technical decisions, and help shape engineering culture as we scale to serve leading financial institutions worldwide from our London office.

CreateFuture is seeking a Lead Backend Java Engineer in England to define technical direction and inspire engineering teams. This role combines technical expertise with leadership to build world-class backend systems. Successful candidates will leverage their experience with Java, Spring, and cloud technologies to drive architectural decisions while mentoring a diverse group of engineers. The position offers hybrid working options and comprehensive benefits.

Jobgether is seeking a Senior Software Engineer (AI Agents) based in the United Kingdom to design and build the core infrastructure powering AI agents and orchestration systems. You will work on tool execution, context management, evaluation pipelines, and reliability layers for a scalable AI product in a remote-first environment. This is ideal for engineers who thrive in ambiguity, own projects, and mentor peers while delivering high-impact backend solutions.

London Stock Exchange Group (LSEG) is seeking a Senior Java Developer to join our FX trading support team in London. You will help develop and improve mission-critical backend systems, focusing on speed, reliability and scalability, in collaboration with engineers, product partners, and operations. The role emphasizes ownership of features from development to production and adherence to secure coding practices, with opportunities to shape how our trading platforms are designed and built.

Overview Execute hands-on quality assurance activities, primarily manual testing, to ensure stable and reliable product releases. Collaborate closely with Developers, Product Owners, and Business Analysts to ensure solutions meet functional, non-functional, performance, and scalability requirements. Design, maintain, and execute test artefacts including test plans, test cases, acceptance criteria, and regression test suites. Manage the full defect lifecycle, including accurate logging, prioritisation, investigation, escalation, and verification through to resolution. Validate backend data integrity and test outcomes using SQL queries and database checks. Analyse application behaviour and performance using logs and metrics (e.g. Splunk) to identify quality risks. Perform API validation using tools such as Postman. Support deployments to test and staging environments using SSH and Git. Work within AWS environments (including S3, EC2, RDS, and Lambda) to support QA and testing activities. Design and execute complex test scenarios across multiple browsers and platforms. Prepare, manage, and maintain appropriate test data to support functional and end-to-end testing. Ensure effective fault reporting, monitoring, and communication throughout the testing lifecycle. Participate in root cause analysis of defects and incidents. Contribute to improving QA processes, standards and best practices. Foster a positive, solution-focused approach, providing clear, constructive, and open feedback. Requirements Degree-level education in Computer Science, Information Technology, or a related technical discipline, or equivalent practical experience Minimum of 3 years' experience working as a QA Engineer in a fast-paced Agile environment Strong understanding of Agile methodologies, including Scrum and Kanban Experience across the Software Development Lifecycle (SDLC) and Software Testing Lifecycle (STLC) Proven experience in manual testing across functional and non-functional requirements Hands-on experience testing APIs using tools such as Postman or Swagger Comfortable working with Unix/Linux command line environments Experience working closely with developers and coordinating test and release branches using Git Strong verbal and written communication skills ISTQB Certified Tester - Foundation Level (or equivalent) - Desirable Exposure to non-functional testing areas such as performance, scalability, load, or security testing - Desirable Experience with Git version control, including Gitflow branching strategies - Desirable Knowledge of media file formats and metadata (e.g. XML) - Desirable Familiarity with Digital Cinema Industry (DCI) file types and standards - Desirable Awareness of scripting or programming languages such as PHP, Python, or JavaScript - Desirable Note: Remove any promotional or ATS-related content that is not part of the job description.

You will need to download, save and complete a copy of the application form using Microsoft Word or preparea copy of your CV that contains all the information requested in the application form. Applications are invited for a Senior Developer to join the Research Faculty at the Earlham Institute, based in Norwich, UK. Background: Help build the platform behind some of the largest biodiversity genomics programmes ever attempted. COPO (Collaborative OPen Omics) is a Django-based metadata brokering platform developed at the Earlham Institute. It helps researchers describe, manage and publish biological data in line with the FAIR principles (Findable, Accessible, Interoperable, Reusable). COPO captures standards-compliant metadata and brokers submissions to public repositories including the European Nucleotide Archive (ENA), BioSamples, Zenodo and DataCite, and packages research outputs as RO-Crates. COPO is the metadata backbone for projects of international scientific significance, including the Darwin Tree of Life programme and Biodiversity Genomics Europe, supporting the description and submission of samples, sequencing data and derived analyses from biodiversity genomics at scale. The role: We are seeking a talented Senior Developer to deliver the next phase of COPO's evolution. The work will evolve COPO's existing Python/Django codebase, establishing a cleaner, more maintainable architecture with improved APIs and user-facing components. You will enhance the platform's ability to support new use cases and integrations while preserving the metadata handling excellence that makes COPO invaluable to the research community. Working across the full technology stack, you will develop dashboards, data portals, APIs and the services that support COPO's metadata validation, curation and submission workflows. Data visualisation and API design sit at the heart of the role, transforming complex, multi-source scientific metadata into clear, reliable and well-documented interfaces that researchers can depend on. Ideal candidate: The ideal candidate will have a degree (or equivalent professional/practical experience) in computer science, software engineering, bioinformatics or a related discipline. You will have experience delivering full-stack web applications using modern frontend and backend technologies, with a strong track record in designing, building and documenting RESTful APIs. Comfortable working in collaborative engineering environments, you will be confident with version control, code review practices, containerisation and CI/CD workflows. The post holder will have a talent for turning complex or ambiguous requirements into intuitive, user-focused solutions, and an appreciation of FAIR data principles, ontologies or controlled vocabularies. Experience with data visualisation and dashboard development, scientific data or metadata standards, cloud or research-computing environments, or domains such as genomics, biodiversity or ecology would be advantageous. Additional information: Salary on appointment will be within the range £47,450 to £58,000 per annum depending on qualifications and experience. This is a full-time post for a contract until 31 August 2028. This role does not meet the full salary requirements set by UKVI to allow for visa sponsorship. However, some individuals may still be eligible for visa sponsorship depending on their personal circumstances. Please note, the occupation code for this role is 2134, which is not on the immigration salary list. As a Disability Confident employer, we guarantee to offer an interview to all disabled applicants who meet the essential criteria for this vacancy. The closing date for applications will be 19 August 2026.

IBM is seeking entry-level software engineers in Greater London to contribute to backend services and distributed systems. The role emphasizes learning, collaboration, and delivering clean, well-tested code across a small agile team. Ideal candidates will have strong fundamentals in data structures, algorithms, and operating systems, plus experience with at least one modern language (Java or Go). Exposure to Kafka and cloud tooling is a plus.

Mid-Level Full-Stack Engineer at Volteras - build across the full stack at an early-stage connected vehicle data company. Remote from Europe or the UK. We're looking for a Full-Stack Engineer who can own work end-to-end - from API and backend through to shipping production frontend features. You'll work across Python, TypeScript, and AWS, contributing to the infrastructure and practices that scale with us. You'll be joining a small, ambitious team at an early stage. That means real ownership - scoping problems, proposing solutions, and driving them to production without waiting on detailed specs. You'll collaborate closely with world-class senior engineers and report to the Principal Software Engineer. Your work will shape how we build. This is a remote role open to candidates based in Europe or the UK, with a salary of £40-60k. The connected vehicle data platform Our collaborative approach ensures your integration is perfectly aligned with your use case. Begin a partnership built on reliable, OEM-grade connected vehicle data.

Junior Full Stack Developer: AI-Assisted Engineering Help build the AI-powered platform giving young people real earning power. MyPocketSkill is looking for a Junior Full Stack Developer to join our engineering team and help build our fintech/edtech platform for 13-25-year-olds. This is a hands-on role for someone early in their software career who wants to learn quickly, ship fast and make real progress using modern AI coding tools such as Claude, Cursor, Augment, GitHub Copilot or similar. About MyPocketSkill MyPocketSkill helps young people: Find paid work in areas like tutoring, social media and photography Earn, Save and Learn about money Build financial confidence through AI-powered tools and education We are now developing new AI features, partner integrations and improved product journeys. The role You will work closely with our founders and product team to build features, fix bugs and improve the platform. You will: Build backend, frontend and internal product features Use AI coding tools to write, test, debug and refactor code faster Support development of AI-powered matching, recommendations and learning tools Review AI-generated code carefully before it is shipped Write clean, maintainable code with appropriate tests Learn the codebase quickly and take on more ownership over time About you We are looking for someone with strong fundamentals, high learning velocity and genuine curiosity about AI-assisted software development. Must-have Some commercial, internship, freelance or strong project experience Familiarity with web development and databases Experience using, or strong interest in using, AI coding tools Good problem-solving skills Clear communication and willingness to ask questions Attention to detail when testing and shipping code Interest in fintech, edtech, marketplaces or AI products Nice-to-have Django, Vue, React or PostgreSQL experience Familiarity with GCP, CI/CD or cloud deployment Experience with LLM APIs, RAG or AI agents Product or UX interest What success looks like You will succeed if you: Learn quickly and ship useful improvements Use AI tools to move faster without sacrificing quality Communicate clearly and take feedback well Show ownership from brief to deployment Grow into responsibility for defined product areas Location: Hybrid. Minimum 2 days/week in Clerkenwell, London Hours: Full-time, typically 40 hours/week Right to work: You must have the right to work in the UK and you must not be on any form of visa scheme. We treat all applicants fairly regardless of gender, sexual orientation, marital status, race, religion, age or disability.

Volteras Technologies Ltd seeks a Mid-Level Full-Stack Engineer to build across the full stack at an early-stage connected vehicle data company. Remote from Europe or the UK. You'll own work end-to-end-from API and backend through to shipping production frontend features. You'll work across Python, TypeScript, and AWS, contributing to scalable infrastructure and practices. You'll join a small, ambitious team, receive real ownership, scope problems, propose solutions, and push them to production

Jobtailor is seeking a QA Engineer to execute hands-on manual testing across functional and non-functional areas, collaborating closely with Developers, Product Owners, and Business Analysts to ensure releases meet requirements. You will design test artefacts, manage the defect lifecycle, and validate backend data with SQL queries. API validation will be performed using Postman, with testing across multiple browsers and platforms.

Your role and responsibilities Strong coding fundamentals: Proficient in at least one programming language with solid understanding of data structures, algorithms, and time/space complexity. Problem solving ability: Can independently solve medium complexity coding problems, debug issues, and break down ambiguous requirements into actionable tasks. Clean engineering practices: Writes readable, maintainable code, uses Git effectively, and follows code review and testing best practices. Backend/API and database basics: Understands REST APIs, HTTP fundamentals, SQL, and basic system design concepts such as client server architecture and caching. Ownership and learning mindset: Takes initiative, seeks feedback, learns quickly, and can deliver assigned tasks with minimal supervision. Strong communication and collaboration: Communicates progress, asks thoughtful questions when blocked, and works effectively within an agile team. Required technical and professional expertise Hands on software development experience (new grads welcome) Solid fundamentals in data structures, algorithms, concurrency, networking, and operating systems Ability to write clean, maintainable, well tested code in at least one modern language (Java, Go, or similar) Curiosity about distributed systems and how large scale services like Kafka are designed and operated A self starter mindset - comfortable asking questions, seeking feedback, and iterating based on code review Strong communication skills and willingness to collaborate closely with a small team Preferred technical and professional experience Coursework or projects involving Apache Kafka, distributed systems, or cloud infrastructure Exposure to Kubernetes, Docker, or cloud platforms (AWS/GCP/Azure) Contributions to open source projects. - Interest in observability or platform engineering IBM is committed to creating a diverse environment and is proud to be an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, gender, gender identity or expression, sexual orientation, national origin, caste, genetics, pregnancy, disability, neurodivergence, age, veteran status, or other characteristics. IBM is also committed to compliance with all fair employment practices regarding citizenship and immigration status.

Responsibilities Perform exploratory data analysis on a range of complex business problems. Interpret business processes into data requirements. Define and enforce key data attribute governance strategies. Act as geographical data leader, reporting directly to the Data Architecture Manager. Collaborate on data team initiatives impacting Ontic's global strategic pillars. Administer and maintain the Snowflake Data Warehouse. Devise and maintain data engineering development standards in line with best practice. Contribute to data pipelines that clean, transform and aggregate data from disparate data sources into reporting data stores. Provide input on the company data strategy by suggesting and proving new technologies and innovations. Contribute to the translation of data into valuable insights that inform data driven decisions. Develop dashboards and reports to present data insights to stakeholders around the business. Support end-user technical questions and assist in data education. Host on-site data quality clinics. Participate in and audit data governance activities. Requirements Proven experience of administering and working in a Data Warehouse (experience of Snowflake highly preferred) Ability to influence a team of technical and non-technical stakeholders Experience building data models and flows from various sources using Kimball Dimensional Modelling techniques. Proven knowledge of data warehousing and data modelling principles. Experience of DBT Strong SQL programming experience in a commercial setting. Experience of using BI reporting tools (i.e. Power BI) with an ability to develop reports and dashboards. Awareness and familiarity with AI tool and technologies - preference for tools such as OpenAI Codex, Snowflake Cortex, Snowflake Intelligence Experience of administering, creating, and maintaining data pipelines in an ELT application that cleans, transforms, and aggregates data from disparate data sources into reporting data stores. Experience documenting ELT specifications such as source to target mappings, business rules and data validation requirements, ETL functional and non-functional requirements. Strong analytical and problem-solving skills with a keen attention to detail. Excellent oral and written communication skills for translating data insights into concise executive summaries and presentations. Ability to present findings in a structured, clear manner with actionable insights. Possess ability to both multi-task and manage priorities effectively with the ability to work proactively and independently in meeting stakeholder needs whilst adhering to tight deadlines. Appreciation of data security, CCPA, GDPR and PII data handling principles. A willingness to be utilised as a developer across other enterprise applications. Experience of working in the Aerospace, Engineering, Manufacturing sectors Experience with below toolset preferred: Snowflake cloud platform, Dbt, FiveTran, Precog, Microsoft Fabric/Power BI Analytics, GitHub, SDLC, Kimball Dimensional Modelling, Dynamics 365 Backend, Infor Syteline and/or Infor Visual ERP Backend, SQL

Frontend DeveloperApplyremote type: Hybridlocations: London, UKtime type: Full timeposted on: Posted Yesterdayjob requisition id: JR101611This role will focus on User Interface implementation. What this role will do: • Build and maintain responsive, high-quality user interfaces using React.js, Material UI, HTML, and CSS, ensuring seamless integration of design and functionality. • Work closely with backend and frontend engineering teams to ensure designs are implemented with precision, maintaining high performance and usability standards. • Collaborate with Product Managers to understand complex requirements in the financial and climate risk domains and create intuitive, user-focused designs that address these needs. • Balance visual appeal with usability by adhering to design principles, ensuring consistency across the platform, and optimizing for performance and responsiveness. • Continuously refine and improve the user experience by incorporating feedback, staying updated on UX best practices, and iterating on designs to meet evolving user needs. Skills required: • Strong proficiency in React.js, along with strong skills in HTML, CSS, and JavaScript. • Demonstrated experience developing and maintaining production-level code. • Solid experience in UI and visual design for modern web applications. • Proven hands-on experience in UX design and implementation. • Proficiency in Figma components, prototyping, and design systems. • A keen eye for visual hierarchy, accessibility, and responsive design principles. • Comfort working in agile, cross-functional teams alongside designers, developers, and product managers. • Proactive stakeholder management and ability to clearly communicate the reasoning of design choices. • Previous data visualisation designs and data centric UX experience is preferred but not required.Commitment to create positive environmental value for our clients across sectors, helping them shape the future of their sustainability transition About us SLR are global leaders in Sustainability Solutions, helping our clients achieve their sustainability goals. We are a consultancy with 4500+ employees across 6 regions in over 125 countries. Our 'one team' culture is at the heart of our business, providing a collaborative and supportive environment for professional development. Culture & Inclusion at SLR We are committed to being an equal opportunities employer, and our expectations go beyond purely complying with legislation. Through our Regional C&I Committees, Global Council and Employee Networks, we foster an inclusive environment where all people regardless of their background can thrive.We welcome applications from all individuals, regardless of their background, including those from groups that are currently under-represented at SLR, such as people identifying as 2SLGBTQI+, Indigenous peoples, ethnic minority groups, women, and people with visible or invisible disabilities, including those who are neurodivergent. About UsWe're Making Sustainability Happen.We don't have all the answers to the complex sustainability challenges faced by humanity today. But we're working on it. We are a consultancy with 4,500+ employees, working on projects in over 125 countries around the world.When you join SLR, you'll work alongside some of the world's leading advisors and technicians on projects of global importance in the environmental space.We know sustainability starts from within. And no matter how good we are today, we can always do better. We continually work on our internal ethics to set the standard for organisations and reflect the advice we give to clients.

Lloyds Banking Group in the United Kingdom seeks a Senior Software Engineer to design, build and improve backend software within the Loans & Affordability Platform, collaborating with product and engineering teams in an agile environment. You will lead backend microservices and RESTful APIs, mentor junior engineers, and ensure high-quality engineering practices across the delivery lifecycle. Strong Java (17+) with Spring, SpringBoot, Kubernetes and cloud experience (GCP) are preferred.