Top Full Stack Developer Jobs in London

Build end-to-end features, design intuitive interfaces, manage asynchronous backend jobs, and contribute to open-source efforts, while leading project development from concept to monitoring.

Own end-to-end features across Java backends and a TypeScript/Angular frontend for a multi-tenant SaaS platform. Design APIs, schema and queries (MySQL/ClickHouse), build performant UIs, write unit/integration/e2e tests, deploy via containers/CI-CD, and integrate LLM/agentic workflows to help users find and fix data quality issues.

Lead frontend work on a TypeScript/Angular product, owning component architecture, state management, performance, and tests. Build data-dense UIs and Storybook-driven components, ship agentic (LLM) features, shape APIs and implement backend Java endpoints, write SQL, mentor engineers, and work directly with product, design, and customers to deliver end-to-end features.

Build and maintain scalable full‑stack, cloud‑native applications and microservices. Develop REST APIs with Node.js/Express, responsive Angular frontends, automated tests (Jest), and CI/CD (GitLab). Support containerisation, serverless AWS services, Terraform IAC, performance tuning, and collaborate in Agile multidisciplinary teams.

Design, build, and maintain scalable full-stack applications and microservices using Node.js/Express and Angular. Develop secure REST APIs, implement Jest automated tests, contribute to GitLab CI/CD pipelines, support cloud-native/containerised and serverless deployments on AWS, participate in Agile teams, perform code reviews, and optimise application performance and reliability.

Build and evolve Groove, a fullstack platform using React, TypeScript, Java, GraphQL, PostgreSQL, and GKE. Deliver features for planning, tracking, and dependencies, ensure production reliability, participate in on-call rotations, mentor engineers, and lead end-to-end design and architecture for scalable systems.

Lead a small squad to design, build, and ship new origination product categories and deep integrations. Translate ambiguous commercial goals into deliverable technical plans, mentor engineers, make risk judgments for deal-gating tooling, and represent technical direction to commercial and international stakeholders. Stay hands-on on the hardest technical work and ensure new products drive origination pipeline outcomes.

Build and maintain full-stack features across frontend and backend in TypeScript. Shape architecture, support onboarding and migrations, fix bugs, and support customer success. Work across devops, testing, and shipping production systems for charity-focused product features.

As a Full-Stack Software Engineer, you'll lead the technical strategy for AI applications in the public sector, architecting frameworks, guiding development, and mentoring staff.

As a Senior Full-Stack Software Engineer, you will develop AI applications for public sector clients, design full-stack solutions, and manage cloud infrastructure while collaborating with cross-functional teams to address complex challenges.

Lead enterprise Java full-stack strategy and modernization (cloud, microservices, event-driven, API platforms). Champion AI-driven development and LLM/GenAI tooling. Oversee backend (Java) and frontend (React/Angular) delivery, ensure secure scalable design, CI/CD and DevSecOps practices, reduce technical debt and vulnerabilities, and lead large-scale programs for velocity, reliability, and cost efficiency.

As the primary engineer for Aperture OS, you will own the full codebase, drive feature development, manage API and AI integrations, and ensure security and scalability in a multi-tenant SaaS environment.

Build and ship end-to-end product features across frontend, backend, APIs and databases. Create customer and internal workflows (onboarding, payments, accounts, KYC, FX, rewards, support automation). Turn ambiguous product problems into reliable systems, collaborate with product, design, mobile, backend and AI teams, build internal tools and automation, and own production monitoring, debugging and improvement post-release.

Build core AI platform capabilities (agent runtimes, model routing, tool registries) and production-grade services and tooling using Node.js, TypeScript, NestJS and React. Develop reusable AI infrastructure, work with LLMs and LangChain/LangGraph, and own features end-to-end to enable secure, scalable AI across the company.

As a founding full-stack engineer you'll build end-to-end product features, craft high-performance frontend UX with TypeScript/React, design scalable PostgreSQL schemas and RLS via Supabase, create edge APIs, backend services and workers, integrate smart contracts and blockchain indexing, implement modern auth (e.g., WebAuthn), and make architecture decisions to drive product-market fit while upholding security and engineering best practices.

The Senior Full-Stack Engineer will build end-to-end features, create APIs, write requirement documents, and learn Rust while improving product experiences for users.

As a Full Stack Developer on the AI Team, you will build production-ready backend and full-stack features, integrating AI functionality into the think-cell product while collaborating with C++ and AI engineers.

Design, build, and maintain scalable backend systems and APIs using Go/Python. Integrate enterprise services, data pipelines, event-driven tech (Temporal, Kafka), and LLMs (OpenAI, Gemini, Claude). Ensure security, high availability, multi-tenant SaaS deployments, and improve engineering practices across the stack.

Part-time full‑stack developer to maintain and extend a global Laravel backend and modern frontend (Angular/React/Vue). Responsibilities include architecture, DevOps tasks, code reviews, using MySQL, PHP/JavaScript/TypeScript, GitLab workflows, and AI-assisted coding tools. Work in one-week Scrum sprints, ~10+ hours/week, equity-based compensation; applicant must hold a full‑time job.

As a Fullstack Engineer at Proton, you will design, build, and operate systems related to mail delivery and security, collaborating on user-facing features and leading development processes.