Jack & Jill/External ATS

Job Title: Site Reliability Engineer Salary: £90k Equity Company Description: EQUALS - World's largest social music network Job Description: As the sole SRE, you will own the infrastructure powering a social network of over a million users. You will manage a high-scale AWS environment using Pulumi, optimize PostgreSQL 17 for massive datasets, and ensure system reliability during exponential growth. This is a high-impact role where you control the platform's operational health. Location: London, UK Why this role is remarkable: Take full autonomy as the sole infrastructure owner for a platform with 1M+ users and exponential monthly growth. Tackle massive scale challenges, including music catalog ingestions of over 1 billion rows and real-time chat infrastructure. Enjoy a high-impact environment with direct replacement status for a departing senior lead and a significant £100k+ equity package. What you will do: Manage and evolve AWS infrastructure via Pulumi (TypeScript), covering ECS/Fargate, RDS, ElastiCache, and Lambda. Own the monitoring and observability stack using Datadog APM to reduce alert fatigue and lead incident response. Optimize data pipelines and performance, including Airbyte replication and PostgreSQL tuning for high-concurrency music streaming. The ideal candidate: Deep expertise in AWS (ECS/Fargate, RDS, SQS) and Infrastructure-as-Code using Pulumi, Terraform, or CDK. Strong PostgreSQL and Redis knowledge, specifically regarding performance tuning, indexing, and connection pooling at scale. Proven experience in incident response and CI/CD management, with the ability to stay calm and diagnose issues in production.

A fintech infrastructure company is looking for a Senior Frontend Engineer to join its Cards team. You will design and build robust APIs and UI components for secure card data tokenization. The role involves working with customers to understand complex payment stacks and shipping features end-to-end using Rust and TypeScript. Candidates should have 3-10 years of software engineering experience and a strong foundation in CS, math, or physics. The company offers a dynamic work environment in London with significant growth opportunities.

A seed-stage AI startup is seeking a Staff AI Engineer to lead its technical direction. You will orchestrate specialized agents to solve complex challenges in financial services, ensuring accuracy and compliance. The role requires extensive production-grade AI systems experience, particularly in NLP and document intelligence. Join a talented team backed by Salesforce Ventures and work on groundbreaking AI technologies in a high-stakes environment. This position is based in London, UK with competitive salary offerings.

Job Title: Security Engineer Salary: £110K - £200K + Offers Equity Company Description: Incident.io - Series B AI incident response platform backed by Index Ventures and Insight Partners. Job Description Join Incident.io as our first Security Engineer to lead application security for a 60+ person product team. You will partner with engineers to design secure systems from the ground up, identifying vulnerabilities through white-box and black-box testing. This foundational role shapes the security culture at a rapidly scaling, high-trust engineering organization. Location: London, UK Why this role is remarkable Foundational hire opportunity to build the security function from scratch without inheriting tech debt or rigid legacy processes. Join a high-growth Series B startup that has raised $100M from world-class investors like Index Ventures and Insight Partners. Work within a high-trust, ex-Monzo leadership culture that prioritizes shipping quality product daily and values engineering excellence. What you will do Partner directly with product teams to design and review features with security deeply integrated from the initial architecture phase. Identify and mitigate vulnerabilities using a mix of code reviews, architecture analysis, penetration testing, and automated fuzzing techniques. Implement pragmatic security tooling and automation across the CI/CD pipeline and GCP infrastructure to strengthen defenses without slowing delivery. The ideal candidate Senior or Staff-level professional with a deep track record in application security, vulnerability research, or specialized red teaming. Hands on experience with modern web stacks, specifically Go, TypeScript, React, and cloud security within Google Cloud Platform (GCP). Collaborative mindset that thrives when embedded in product teams, acting as a coach rather than a gatekeeper for secure coding practices.

Job Title: Staff AI Engineer Salary: £120k-150k + Equity Company Description: Covecta - Seed-stage Agentic AI platform backed by Salesforce Ventures Job Description: As the most senior AI hire, you will lead the technical direction of a purpose-built platform orchestrating dozens of specialized agents across the financial services lifecycle. Moving beyond simple wrappers, you will solve complex document intelligence and multi-agent coordination challenges for major institutions like Metro Bank in a highly regulated, high-stakes environment. Location: London, UK Why this role is remarkable Lead AI engineering at a startup that scaled from MVP to paying enterprise customers across the UK and US in under a year. Work on high-stakes technical challenges including multi-agent orchestration, hallucination detection, and auditable AI for a $36 trillion industry. Join a talent-dense team founded by former Mambu and McKinsey leaders, backed by a recent $6.5M seed round led by Salesforce Ventures. What you will do Design and own the agentic orchestration layer that coordinates 50+ specialized financial agents with human-in-the-loop oversight. Architect robust evaluation and alignment frameworks to ensure accuracy, explainability, and policy compliance in regulated banking workflows. Build intelligent document processing pipelines to extract structured data from complex financial paperwork like regulatory filings and credit memos. The ideal candidate Extensive hands-on experience shipping production-grade AI systems, specifically within NLP, document intelligence, or agentic systems. Strong research instinct with the ability to translate emerging techniques into reliable systems using structured reasoning and guardrail design. High-velocity startup mindset with the architectural judgment to make consequential build-versus-buy decisions and shape a growing engineering culture.

Job Title: Full Stack Engineer Salary: £60k-£80k + Equity Location: Cambridge, UK Company Description: Lichen AI - Early stage agentic platform for AI discovery Job Description: As the first full time engineer, you will transform a working prototype into a production grade enterprise SaaS. You'll build robust backends, design intuitive interfaces for complex AI outputs, and establish foundational engineering practices. Working directly with an expert founding team, you will ensure the platform is secure, reliable, and ready for global enterprise customers. Why this role is remarkable Join as the first founding engineer with a significant equity stake and a clear path to technical leadership as the company scales. Work alongside a world class founding team including the former Chair of the UK Government's AI Council and Amazon Alexa's speech recognition lead. Build a mission driven platform that uses agentic AI to amplify human insight rather than replacing it, solving a critical adoption gap for enterprise clients. Responsibilities Transition a high potential prototype to a production grade platform by building secure, scalable backend systems and automated deployment pipelines. Lead the end to end development of the user interface, making complex AI generated insights legible and actionable for non technical business users. Implement enterprise grade security and compliance standards including ISO 27001 and GDPR to ensure safe handling of sensitive client data. The ideal candidate Has 3 8 years of experience shipping production web applications using modern JavaScript/TypeScript (React) and Python (FastAPI). Demonstrates strong proficiency in cloud infrastructure, specifically AWS, and designing robust database structures and data pipelines. Thrives in a small, fast paced startup environment and possesses a genuine interest in human centered AI that enhances domain expertise.

Job Title: Senior Data Scientist at Faculty Salary: £85,000-£105,000 Company Description: Faculty - Applied AI Leader Job Description Join Faculty's Frontier team to build Computational Twins-sophisticated AI replicas of complex organizational systems. You will lead the design and deployment of production-grade decision intelligence solutions for high-stakes sectors like healthcare and life sciences. This role blends deep technical ML expertise with strategic client leadership to solve critical real-world challenges at scale. Location: London, UK Why this role is remarkable Work at the forefront of Decision Intelligence creating "Computational Twins" that simulate entire business processes for organizations like the NHS and global pharma leaders. Join a PhD-heavy technical culture recently recognized by Gartner as a Visionary, now backed by Accenture's global infrastructure to scale your impact internationally. Enjoy high-end benefits including an unlimited annual leave policy, private healthcare, dental, and specialized professional coaching through Sanctus. What you will do Design and build AI-driven digital reflections of complex systems using supervised learning, time-series, and Bayesian methods to optimize critical decision processes. Lead cross-functional squads of engineers and designers to deliver end-to-end production-grade AI solutions directly to senior stakeholders. Mentor and develop emerging data science talent through technical leadership, code reviews, and potential line management responsibilities. The ideal candidate Possesses 4+ years of professional experience in data science or quantitative research with a strong foundation in statistics and mathematics. Demonstrates expert-level Python proficiency (NumPy, Pandas) and deep familiarity with frameworks like TensorFlow or PyTorch for production environments. Exhibits a business-focused mindset with the communication skills required to translate complex technical strategies into actionable value for commercial clients.

Job Title Senior Full-Stack Engineer (Front-End Leaning) at Encord Salary £80-150k + Equity Company Encord - Series C AI infrastructure platform backed by CRV and Y Combinator Location London, UK Job Description You will lead development of Encord's sophisticated editor interface, solving high-performance rendering challenges for multimodal AI datasets. Operating with end-to-end ownership, you'll build systems that visualize complex 3D scenes and LiDAR data in the browser. This role is perfect for engineers who enjoy the intersection of computer vision, graphics-heavy front-end development, and physical AI infrastructure. Why this role is remarkable Work on cutting-edge browser-based visualization for massive datasets including LiDAR, 3D point clouds, and medical imaging at a scale of 5+ petabytes. Join a high-growth leader that recently raised $60M in Series C funding at a $550M valuation to power the next generation of physical AI and robotics. Enjoy high autonomy and end-to-end ownership in a small, elite engineering team composed of veterans from Oxford CS, Meta, and top-tier startups. What you will do Design and implement complex, performance-critical UI components for rendering thousands of objects in 3D/4D scenes at 60fps using TypeScript and React. Lead full-stack projects from architectural decisions and product design through to deployment, monitoring, and measuring direct customer impact. Collaborate with a high-performing team to build simple, robust solutions for managing multimodal data used by industry giants like Toyota and Skydio. The ideal candidate Deep expertise in TypeScript and React with a proven track record of building complex, rendering-intensive web interfaces or graphics tools. Strong foundation in Computer Science with experience in canvas rendering, WebGL, or GPU-accelerated graphics within a production environment. A proactive builder mentality, comfortable navigating ambiguity and moving across the stack (Python/Rust) to ensure reliable, performant product delivery.

A leading AI firm in London is looking for a Senior Data Scientist to join their Frontier team. The role involves designing AI-driven solutions, mentoring talent, and collaborating with stakeholders to tackle complex organizational challenges. Candidates should have over 4 years of experience, expert-level proficiency in Python, and familiarity with ML frameworks like TensorFlow or PyTorch. The position offers competitive salary and high-end benefits, including unlimited annual leave and private healthcare.

A cutting-edge AI infrastructure platform is seeking a Senior Full-Stack Engineer (Front-End Leaning) to lead the development of complex visualization tools for AI datasets. You will design and implement high-performance UI components using TypeScript and React, manage full-stack projects, and collaborate with an elite engineering team. Ideal candidates possess deep expertise in front-end technologies and a strong foundation in computer science. Competitive salary and equity are offered, along with high autonomy and the opportunity to work on innovative projects.

Job Title Tech Lead - Fullstack Developer Salary £80k Company Description Nourish Care Systems Limited - UK-leading digital care management platform Location Remote, UK Job Description Lead a cross functional product triad to revolutionise social care through technology. As a hands on Tech Lead, you will spend 70% of your time writing production code and 30% mentoring developers. You'll architect scalable systems using Ruby on Rails and Vue.js that empower over 425,000 carers to deliver person centred care daily. Why this role is remarkable Impact life at scale by building tools used by nearly a million people daily to improve the quality of residential and nursing care. Join a market leader backed by Livingbridge, offering the stability of an NHS assured provider with the ambitious growth mindset of a scale up. Work in a high trust, polyglot environment that prioritises clean code, automated testing, and developer enablement over rigid project deadlines. What you will do Write production code across the full stack including Ruby on Rails, PHP (Symfony), Vue.js/TypeScript, and AWS infrastructure. Lead a product triad alongside a Product Owner and Designer, owning technical delivery and architectural decisions for your team's domain. Mentor and develop three direct reports through regular pair programming, code reviews, and career growth planning. The ideal candidate Extensive professional experience in object oriented development, particularly with backgrounds in Ruby, Java, or C#. Proven track record of leading technical delivery and managing the technical risks of long lived, scalable SaaS systems. Strong product engineering mindset with a focus on observability, CI/CD pipelines, and designing for long term maintainability.

Jack & Jill/External ATS is seeking a Senior Machine Learning Engineer in London to lead the development of AI systems optimizing drug discovery and clinical development. You will architect MLOps pipelines and scalable cloud infrastructure while mentoring junior engineers and translating complex AI strategies into actionable roadmaps. Ideal candidates will have significant experience in operationalizing ML models, familiarity with AWS/Azure/GCP, and strong leadership skills. Enjoy perks like unlimited annual leave and private healthcare.

Job Title: Senior Machine Learning Engineer - Life Sciences Company Description: Faculty - Applied AI scaleup and Decision Intelligence leader Job Description: Lead the development of production-grade AI systems that optimize drug discovery and clinical development for global pharma giants and MedTech startups. You will architect end-to-end MLOps pipelines and scalable cloud infrastructure, ensuring complex models move from research to real-world healthcare impact. This is a technical leadership role driving life changing medical innovation. Location: London, UK Why this role is remarkable Work on mission critical healthcare challenges, using AI to accelerate the delivery of life changing therapies to patients faster than ever before. Join a prestigious, PhD heavy engineering culture recently recognized by Gartner and slated for a strategic acquisition by Accenture in early 2026. Benefit from a high variety consulting style environment while enjoying world class perks like an unlimited annual leave policy and private healthcare. What you will do Lead technical scoping and architectural decisions for high impact ML systems, moving models from experimentation into production grade software. Build and manage scalable infrastructure using Docker, Kubernetes, and cloud platforms like AWS, Azure, or GCP to support global operations. Mentor junior engineers and act as a trusted technical advisor to senior stakeholders, translating complex AI strategies into actionable engineering roadmaps. The ideal candidate Extensive experience operationalizing machine learning models at scale using Python and frameworks like TensorFlow or PyTorch within robust CI/CD workflows. Proven expertise in cloud architecture and container orchestration (Kubernetes/Docker) for building reliable, production ready infrastructure. Strong technical leadership skills with the ability to navigate fast paced environments and communicate complex engineering concepts to non technical client partners.

A fintech startup is seeking a Senior Full-Stack Engineer to own the technical architecture for a platform revolutionizing cross-border finance. You will lead the development of a high-performance React/TypeScript dashboard and build multi-currency wallets using cutting-edge technologies. The ideal candidate has 5+ years of full-stack experience with proven success in AI feature development, and will have significant equity stake in this pre-seed startup founded by experienced professionals.

Job Title: Senior Full-Stack Engineer Company Description: SYSTM - VC-backed fintech building the stablecoin financial OS Job Description: As the most critical hire of 2026, you will own the technical architecture of a platform revolutionizing cross-border finance. Working directly with a founder from Plutus, you will build the infrastructure for stablecoin payments and an AI powered Agentic CFO layer, transitioning the product from early design partners to global scale. Location: London, UK Why this role is remarkable: Significant equity stake (1-5%) in a pre seed startup founded by Jasper Tay, the former Co Founder & COO of Plutus with a decade of regulated fintech experience. You will be the primary technical leader, making all build vs buy decisions and shaping the engineering culture from the ground floor as the company closes its funding round. Direct exposure to the cutting edge of finance, integrating Stellar and USDC with autonomous AI agents to automate treasury management for 25+ signed design partners. What you will do: Architect and build multi currency wallets, stablecoin on/off ramps, and yield optimization infrastructure using Stellar and USDC rails. Develop the Agentic CFO layer, implementing LLM powered financial intelligence with autonomous action capabilities and observable AI pipelines. Lead the development of a high performance React/TypeScript merchant dashboard and robust Node.js/Python backend services that meet high compliance standards. The ideal candidate: 5+ years of full stack experience with React/TypeScript and Node.js or Python, demonstrating high senior level ownership of complex product architectures. Proven track record shipping production grade AI/LLM features, including agentic workflows, RAG pipelines, or prompt engineering at scale. Entrepreneurial background as an early engineer or CTO, ideally with domain expertise in fintech, payments, or blockchain infrastructure like Stellar.

A VC-backed AI startup is seeking a Software Engineer to join a high-velocity team focused on building synthetic populations that influence critical decision-making. You'll work directly with influential founders, owning features end-to-end while applying your skills in React, Python, and collaboration. The ideal candidate will thrive in an ambiguous environment and seek to make a meaningful impact through engineering in a London-based office setting, enjoying high autonomy and flexibility.

A tech startup seeks a Full Stack Engineer to transform a prototype into a production-grade enterprise SaaS platform. As the first full-time engineer, you will have significant equity and work closely with an expert founding team. Key responsibilities include building a secure backend, developing a user interface, and ensuring compliance with enterprise security standards. Ideal candidates have 3-8 years of experience with JavaScript/TypeScript (React) and Python (FastAPI), strong AWS proficiency, and a passion for human-centered AI.

A high-growth startup in London is seeking a Security Engineer to lead application security for its product team. The role involves designing secure systems, identifying vulnerabilities, and building the security function from scratch. The ideal candidate will have extensive experience in application security and modern web technologies, fostering a collaborative approach within product teams. The position offers the chance to shape the security culture in a rapidly evolving company that values engineering excellence.

Job Title Senior Platform Engineer (DevSecOps) Company Description - Series C AI platform for debt markets Job Description Join 9fin's high-seniority Platform team to lead the security function from the ground up. You will design and implement the automated guardrails, policy-as-code, and secure-by-default systems that allow engineers to move fast while protecting a platform used by 300+ blue-chip institutions across the $145 trillion global debt market. Location Remote, UK Why this role is remarkable Opportunity to build a security function from a "cold start," defining the standards, tooling, and culture for a unicorn-stage fintech. 9fin just closed a $170M Series C at a $1.3B valuation, providing massive growth trajectory and stability with 300+ institutional clients. Work in a high-autonomy, low-ego environment within a senior Platform team that functions as an internal product group rather than a ticket-based service. What you will do Design and implement automated security guardrails across a multi-account AWS environment using Terraform and policy-as-code. Build and maintain secure CI/CD pipelines in GitHub Actions, including secret scanning, dependency analysis, and build integrity checks. Partner with the Head of InfoSec to translate SOC 2 compliance requirements into pragmatic, engineering-led platform features and automated gates. The ideal candidate Proven experience owning or significantly improving cloud security posture, ideally building security functions from scratch in a startup/scale-up environment. Expert-level proficiency with AWS, Infrastructure as Code (Terraform), and modern application security patterns like decentralized authentication. Strong communicator who can balance security requirements with developer experience to influence engineering teams across the entire organization.

A fintech unicorn is seeking a Senior Platform Engineer (DevSecOps) to build a security function from scratch. This role involves designing automated security guardrails in the AWS environment using Terraform, and creating secure CI/CD pipelines. The ideal candidate will possess significant cloud security expertise and strong communication skills to work with the engineering team effectively. Join a high-autonomy environment and help shape the future of security in the fintech space.