Top Full Stack Developer Jobs in London

Build and operate scalable full-stack systems that protect customer accounts from takeovers, scams, and financial crime. Partner with Product, Design, Data Science, and Investigations teams to develop customer-facing controls, improve fraud detection, and increase automation. Responsibilities include Java and React development, distributed system design, database optimization, CI/CD, testing, independent project ownership, and mentoring junior engineers.

Build and own polished full-stack product features from problem definition through production. Responsibilities include making interface decisions, developing with Python, FastAPI, PostgreSQL, Next.js, and TypeScript, using AI and LLM tooling, modeling production data, writing SQL, safely changing live data, and working autonomously with users and stakeholders. The engineer will maintain quality, handle ambiguity, and deliver software for theatrical rights and royalty operations.

Design, develop, and deliver frontend (React) and backend services; produce architecture artifacts; analyze large data sets and visualizations; improve code quality and system resiliency; mentor junior engineers; use enterprise-authorized AI-assisted development tools; contribute to engineering communities and continuous improvement of infrastructure platform services.

Develop full-stack travel experiences using React, Kotlin, and APIs. Build reusable UI components, backend capabilities, and configurable platform features across web, iOS, Android, and B2B products. Collaborate with product, engineering, platform, and brand teams to own features from requirements through delivery. Improve clickstream data collection, support server-driven UI, migrate legacy traffic, and apply sound API design, traffic management, and error handling practices.

Leads full-stack software development across React or Angular frontends and Node.js/TypeScript backends while owning application lifecycle, risk, controls, resiliency, security, compliance, and operational governance. Designs, tests, deploys, and supports production systems; coordinates disaster recovery and technology refresh activities; mentors engineers; promotes AI-assisted development; and partners with risk, controls, and product stakeholders in an agile environment.

Build and maintain full-stack SaaS features across backend and frontend: develop scalable Python and .NET services, create React/TypeScript UIs, design and integrate REST/gRPC APIs, support cloud-native deployments, production monitoring, incident resolution, and apply security, CI/CD, and testing best practices while collaborating with product and business stakeholders.

Design and deliver enterprise-grade machine learning systems and AI-powered applications for banking. Build scalable, secure, distributed applications and automated cloud, desktop, and ML pipelines. Apply MLOps practices for versioning, reproducibility, and observability while collaborating with cloud and site reliability engineering teams. Develop reusable libraries and business-critical, data-intensive solutions, aligning machine learning problems with business objectives. The role may include mentoring or people leadership.

Lead technical strategy, architecture, and delivery for a large-scale risk analytics and reporting platform. Design scalable Java and React-based applications, govern frontend architecture and design systems, integrate enterprise platforms and data sources, and drive reliability, resiliency, observability, security, and compliance. Partner with Risk, Product, Data, Architecture, and Engineering stakeholders while evaluating AI, machine learning, and generative AI capabilities for analytics, automation, and decision support.

Hands-on senior full-stack engineer delivering Java (Spring Boot) and TypeScript applications in complex, cloud-native environments. Lead modernisation, apply DDD and microservices, improve tooling, testing, and developer workflows, collaborate with stakeholders and platform teams, and embed AI-assisted development practices.

Build and maintain scalable marketplace and identity products using TypeScript, Next.js, and React. Deliver impactful, tested features; collaborate with product managers and engineering leaders; communicate technical risks; and support system availability, monitoring, incident response, performance, security, and observability. Contribute code reviews, pair programming, maintainability improvements, pragmatic AI use, and alignment between engineering work, user needs, and business goals.

Design, develop, test, and maintain full-stack web services for a platform automating complex private-asset management. Build Java Spring Boot back-end services and Angular TypeScript front-end components, ensuring usability, scalability, resilience, high availability, and seamless integration. Collaborate with product and engineering teams, document APIs, conduct code reviews, and support Agile delivery. Blockchain, Solidity, and EVM experience is advantageous.

Build and maintain backend services, APIs, data layers, and frontend features for a multi-tenant cash forecasting SaaS platform. Work with Ruby on Rails, React, PostgreSQL, Docker, AWS, and RSpec while improving scalability, observability, performance, and data integrity. Collaborate with product, design, and engineering teams, contribute to technical decisions and code reviews, automate tooling and migrations, and participate in an on-call rotation.

Build and optimize full-stack platform experiences at scale. Responsibilities include improving Angular frontend performance, optimizing PHP, Python, and Go backend services, developing reusable TypeScript UI components, contributing to design systems, improving APIs and architecture, and supporting performance monitoring, testing, accessibility, and usability initiatives.

Build and maintain full-stack product features across Ruby backend services and Angular/TypeScript frontend applications. Collaborate with engineers, designers, and product managers from ideation through production release. Apply accessibility, performance, testing, and design-system practices while learning from experienced engineers. Use authorized AI coding tools responsibly and contribute to a supportive, inclusive engineering culture.

Develop, test, deploy, and own full-stack software features for frontline unmanned-systems operators. Work across backend Python, frontend, embedded systems, networking, machine learning, and DevOps. Translate customer feedback into reliable production updates, conduct field testing, and improve operational performance while expanding into unfamiliar technical areas as needed.

Build and operate client-facing web applications with a front-end focus using React and Next.js, alongside Node.js services, REST APIs, integrations, data systems, and .NET services. Collaborate with designers, shape product and technical solutions, maintain component libraries, implement secure authentication, and contribute to architecture, testing, code reviews, CI/CD, and production releases in an agile Kanban environment.

Design, develop, and maintain scalable full-stack applications using C#, TypeScript, and React. Build microservices and APIs, implement CI/CD and automated testing, optimize performance and security, troubleshoot production issues, contribute to architecture, mentor junior engineers, and work in Agile teams using cloud and container technologies.

Develop and maintain full-stack software using Java or Kotlin, Spring Boot, REST APIs, databases, and modern web technologies. Contribute to front-end development, automated testing, code reviews, CI/CD, security, accessibility, and performance improvements. Collaborate with product, QA, design, DevOps, and engineering teams in an agile environment while supporting reliable software for public-sector and operational systems.

Leads hands-on development of enterprise-scale, AI-powered full-stack applications and developer platforms. Establishes architecture and technical direction across frontend, backend, APIs, cloud, and platform systems. Drives Generative AI adoption, DevSecOps, automation, scalability, and engineering standards across teams while partnering with senior stakeholders and mentoring engineering leaders and senior technical talent.

Lead technical direction and hands-on development for full-stack products across C#/.NET, Node/TypeScript, React, and PostgreSQL. Own architecture, delivery planning, code quality, backend design, and feature delivery while collaborating with Product, Design, and QA. Mentor engineers, facilitate Agile ceremonies, review code, document processes, and promote AI-assisted development and engineering best practices.

Design, develop, and maintain scalable full-stack applications using Python and React. Build RESTful APIs, backend services, and third-party integrations; deploy and manage applications on AWS; use AI-assisted coding tools such as Claude Code and Cursor; and ensure performance, security, scalability, and maintainability. Collaborate on architecture, code reviews, CI/CD, testing, troubleshooting, and production optimization.

Build and deploy full-stack software for business clients, including AI-assisted workflows that extract meaning from unstructured documents, spreadsheets, and email. Own deployments from scoping through production, collaborate with founders and technical leaders, incorporate client feedback into reusable product improvements, and improve output accuracy, reliability, and adoption. The role requires strong product judgment, client communication, end-to-end engineering ownership, and on-site work five days per week in London.

Build and ship full-stack software for client teams, owning delivery from specification through production. Responsibilities include leading customer conversations, designing frontend and backend systems, modeling data, integrating AI components, developing AI-assisted workflows for unstructured inputs, and rapidly iterating based on user feedback. The role requires close collaboration with clients and company leadership, product judgment, and on-site work in London five days per week.

Develop and maintain full-stack features, APIs, web applications, data layers, integrations, and cloud-based services for investment products. Design secure, scalable solutions using Node.js, TypeScript, React, MongoDB, SQL, AWS, containers, and CI/CD tools. Collaborate with Product, UX, Business, and engineering teams; contribute to architecture, testing, deployment, monitoring, DevOps ownership, and continuous improvement.

Build Java backend tooling that integrates AI into coding, testing, deployments, defect triage, observability, and CI/CD workflows. Evaluate and safely integrate LLM developer tools with Jira, Confluence, GitLab, and internal systems. Automate manual engineering processes, improve testing and release practices, track delivery metrics, support responsible AI adoption, collaborate with security and compliance, and mentor engineers.