Top Full Stack Developer Jobs in London

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.

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.

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.