Top Full Stack Developer Jobs in London

Build end-to-end full‑stack products: design and ship frontend, backend, and infrastructure; integrate AI/ML and LLMs; own production systems for performance, reliability, and iteration; prototype, run experiments, and lead technical decisions alongside engineering leadership.

Senior individual-contributor role owning architecture for the companys most complex systems. Lead design and production of full-stack, AI-native platforms (LLM workflows, intelligent pipelines), set engineering standards, mentor engineers, and translate ambiguous product bets into concrete technical plans while preventing systemic technical risk.

Design, build, and maintain production-grade microservices and web applications to power personalization and recommendations. Implement model-serving and inference integrations, ensure resiliency, observability, and low-latency performance, work with event-driven and caching patterns, collaborate with AI/ML and data teams, drive technical designs, mentor engineers, and operationalize services for production readiness.

Full‑stack software development for Tempo flagship products: implement frontend and backend features, write tests, review code, design APIs, optimize performance and scalability, work with product, design, QA, and docs teams, and operate in a remote, collaborative environment using cloud and Kubernetes.

Own and build Zalos' core agent architecture and production-grade LLM pipelines to turn natural-language intents into reliable, auditable cross-system workflows. Implement context management, tool/function calling, failure handling, and tests; collaborate with founders and customers to improve AI reliability in enterprise systems.

As a Senior Full Stack Engineer, you will build and optimize features for a fintech web platform while leading and mentoring junior developers.

Lead architecture and deliver end-to-end, scalable full-stack systems and developer tooling. Hands-on coding across backend and frontend, prototype AI-driven workflows, collaborate with product and design, mentor engineers, and drive engineering best practices to accelerate product delivery and scale.

Hands-on engineering leader responsible for designing, building, and operating cloud-native, event-driven platforms and user interfaces. Lead backend microservices (Java/Spring, Python), real-time data pipelines (Kafka), APIs (REST/OpenAPI/GraphQL/gRPC), and frontend components (Angular/React). Own end-to-end delivery, production support, CI/CD, observability, and mentor engineers while partnering with product and business stakeholders.

Hands-on lead full-stack engineer who designs scalable architecture, ships production SaaS features, integrates AI tools, mentors senior engineers, improves deployment pipelines, and drives engineering quality.

Lead design and development of large-scale, cloud-native full-stack applications. Shape architecture and engineering standards, build frontend and backend services, mentor engineers, ensure scalability, availability, performance, security, and apply DevOps and Agile practices across products.

Lead full-stack development of a cloud-native industrial emissions AI platform. Design scalable APIs and UIs, modernize legacy systems, deliver observable secure production software, champion DevOps/CI-CD, mentor engineers, and drive architectural and operational excellence across front-end and back-end.

As a Senior Software Engineer, you'll architect, build, and deliver features, collaborate with teams, maintain CI/CD pipelines, and support team members in technical matters.

The Senior Full-Stack Engineer will build scalable web applications, design APIs, mentor team members, and ensure high-quality software development following agile methodologies.

Design and build scalable backend services and APIs for high-volume multi-chain transaction flows, lead DeFi and node integrations, optimize production systems for performance and security, and drive features from architecture through deployment.

Develop and maintain front-end and back-end components of AI-driven products, collaborating with teams to enhance user experience and build proof of concept products.

The Full-Stack Engineer will enhance backend functionality, collaborate with teams, and maintain platform performance and security, requiring expertise in Python.

12-month maternity cover Fullstack role owning features end-to-end across a dual TypeScript and C# backend. Build React microfrontend apps, work with event-driven AWS services (ECS/Fargate, Lambda, SQS, DynamoDB, DocumentDB), use AI coding agents to accelerate delivery, collaborate with product and customers, and shape architecture and developer workflows.

Design, build, deploy and maintain secure, scalable identity and authentication solutions; act as technical authority; mentor engineers; own end-to-end development and deployment; ensure quality and compliance while collaborating with product, engineering, and enterprise clients.

Develop and maintain scalable backend and frontend systems for revolving credit products. Design and implement features, fix bugs, write automated tests, follow coding standards, document technical solutions, and collaborate with product teams to deliver high-quality web platforms with automation in mind.

Develop and maintain scalable web applications using React/Next.js and Node.js. Build REST/GraphQL APIs, optimize performance, collaborate in agile teams, perform code reviews, and resolve production issues.

Build and scale AI-driven automation solutions using LLMs and agent frameworks. Design multi-step workflows, integrate AI with internal systems (HR, finance, legal, ticketing), automate document processing and data extraction, and train internal teams. Collaborate with technical leads, product, and IT to deliver practical, production-ready automation and iterate quickly.

Design and build next-generation AI-assisted interfaces for complex IP workflows. Lead front-end architecture, rapidly prototype and ship features from user feedback, integrate advanced WYSIWYG editors, and contribute across the full stack to ensure robust, high-performance delivery as a founding engineering hire.

Build and own full-stack platform systems around AI models: design APIs, database schemas, frontend components, shared libraries, connectors, and data pipelines. Collaborate with design and AI teams, drive features end-to-end from design to production, and shape technical direction and engineering practices.

Design, build, and maintain full-stack web applications using React and .NET Core. Collaborate with data science, product, and design to deliver scalable cloud solutions, APIs, and UI prototypes. Contribute across discovery, delivery, QA, DevOps, and CI, applying SOLID principles and automated testing.

The Full-Stack Engineer will develop core components of a trading system, support production systems, and contribute to trading logic design.