Top Backend Developer Jobs in London

As a Senior Backend Engineer, you will design solutions, produce quality code, manage production incidents, mentor colleagues, and work with diverse tech stacks.

Design, build and deliver scalable, secure backend services and microservices-based systems on Azure. Lead architecture, ensure code quality and testing, promote DevOps/CI-CD practices, mentor junior engineers, and collaborate with cross-functional teams to deliver production-ready, high-performance solutions.

The Senior Backend Engineer will develop backend features for an AI product in healthcare, focusing on systems architecture, data storage, and API integration, while ensuring code quality and scalability.

Build and own backend platform systems around AI models: design APIs, data models and schemas, implement integrations and data pipelines, create internal libraries/tooling, and drive features end-to-end from design to production while collaborating with engineers and AI specialists.

Design and build scalable backend services and data pipelines in Python, deploy with Docker/Kubernetes, integrate enterprise systems (ERP, APIs, SFTP, event buses), process multi‑terabyte datasets, implement CI/CD and infra-as-code, ensure observability and reliability, and collaborate with customers and ML teams to deliver production enterprise features.

Design, build, deploy, and operate API-based backend services for a data-visualization platform. Work with Product, Design, and Data to deliver scalable, reliable solutions using Node.js, TypeScript, PostgreSQL, Terraform and AWS. Improve reliability via testing, observability, CI/CD, and automate deployments. Participate in support rotations and incident management, and contribute to team processes and decision-making.

The Senior Backend Engineer will design and build scalable backend systems, manage projects from design to deployment, write clean code, and collaborate with product teams to address customer problems.

Build and maintain scalable Python backend microservices: productionize data science prototypes, fix production issues, improve monitoring, and ensure tested, well-documented code following engineering best practices.

Build and iterate backend services and front-end facing features to improve B2C EV charging experiences. Enable rapid delivery via feature flags, A/B testing, CI/CD, and robust monitoring. Collaborate cross-functionally with product, mobile, and web teams to design, propose, and deliver user-focused, fault-tolerant solutions.

Design, build, and operate scalable, secure backend systems powering subscriptions, billing, entitlements, pricing, and promotions. Own monetization funnel reliability and performance, ensure compliance and correctness, enable experimentation via feature flags and analytics, and partner with Data to instrument reporting and detect and resolve revenue-impacting incidents.

Design, build, and operate Rive's backend services powering core APIs, real-time collaboration, asset storage, marketplace, authentication/billing, observability, and large-scale background processing. Focus on database architecture, scaling, reliability, security, and performance while collaborating across teams.

The Founding Product Engineer will build and scale tech solutions for the NHS, focusing on automating administrative processes and ensuring quality user experiences. Responsibilities include coding, working in cross-functional teams, and influencing product direction with autonomy.

Lead architecture and delivery across the Consumer domain, specialising in search. Drive scalable, resilient system design, influence cross-team product decisions, mentor senior engineers, and raise engineering standards and observability.

Design and build backend systems for Quadrivia's clinical AI platform, ensuring reliability, high availability, and compliance with healthcare regulations while collaborating with cross-functional teams.

Build and maintain low latency trading services using Rust, ensuring efficient order management and performance optimization in a high-frequency trading environment.

The Senior Backend Developer will drive impact by collaborating with stakeholders, design and develop high-quality software, shape architecture, and lead technical direction while promoting innovation and collaboration within the team.

Implement and migrate core backend systems to Java Spring Boot on GCP. Develop and optimize connectors for marketplaces and social/quick-commerce, rebuild catalog publication flows, migrate legacy business logic into new services, and ensure real-time, accurate stock and price synchronization. Work with PostgreSQL, Redis/Valkey, REST and event-driven architectures running on Kubernetes.

Develop and maintain scalable Java microservices powering Rightmove's iOS and Android apps. Design APIs, troubleshoot production issues, apply TDD and automated testing, collaborate with product, design, and data, and improve performance, reliability and system architecture.

Build and maintain backend services for Depop's shipping journey. Design scalable systems, own features end-to-end, handle production incidents, contribute to architecture, collaborate cross-functionally, mentor teammates, and support CI/CD and testing practices.

Lead technical strategy and architecture for Learning Teams, drive end-to-end strategic initiatives, evolve core services for scalability and reliability, improve engineering practices and developer experience, mentor senior engineers, and make build-vs-buy and tooling decisions.

The role involves developing and maintaining back-end systems for e-commerce platforms using .Net technologies, ensuring data delivery and optimizing application logic. Responsible for integrating API services and enhancing application performance.

Lead the architecture and development of backend services and APIs for e-commerce platforms, ensuring scalability and security while collaborating across teams.

Design, build, and operate low-latency multi-agent LLM systems. Ensure high-quality real-time communication and optimize prompt programming and retrieval processes.

Design and build critical IAM and billing infrastructure for Langfuse, enabling secure user management and accurate usage-based invoicing. Collaborate with teams to ensure seamless integration of authentication and authorization systems, while supporting self-hosted deployments for enterprise clients.

As a Staff Backend Engineer, you'll lead the technical vision for Payments and Fulfilment systems, mentor engineers, and ensure scalability and security.