Top Backend Developer Jobs in London

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.

Join as the second backend engineer to build scalable infrastructure for real-time voice interpretation, owning the core API platform, and architecting systems for high concurrency.

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.

The Senior Backend Engineer will design and deliver backend solutions for Depop's product discovery and personalization systems, improving search relevance and recommendation quality, while working alongside cross-functional teams in an innovative 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.

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

Join Userled.io as a Senior Product Engineer, where you'll design backend systems, develop REST APIs, and collaborate on strategic decisions in a PM-free environment.

As a Senior Back-end Engineer, lead development of scalable microservices and RESTful APIs for a fintech B2B SaaS platform, with a focus on integration and performance.

Design and scale backend systems for an AI-native fashion marketplace, integrating complex payment workflows and mentoring junior engineers.

The Senior Staff Backend Engineer will lead technical direction for systems, manage engineering standards, mentor teams, and ensure alignment with broader company goals. Responsibilities include hands-on coding, architecture, and partnership with product teams to maximize impact.

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

Lead backend architecture and cross-functional projects, build scalable Python/Django services and integrations, mentor engineers, improve performance and observability, and drive data-informed product decisions.

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.

Work in a cross-functional team to design, build, and own backend features and services (primarily Python/Django), implement A/B tests, ensure monitoring and reliability, troubleshoot production issues, and guide technical decisions to improve quality and scalability.

The Staff Backend Engineer will lead the technical vision for Depop's data platform, focusing on data ingestion, scalability, observability, and architecting data solutions while mentoring team members.

The role involves providing backend technical support for gaming projects, developing online services, and collaborating with global game studios to optimize backend performance and stability.

The Senior Backend Engineer will develop scalable systems using Rust, optimize performance, contribute to architectural direction, and ensure security and product quality in a collaborative environment.

Develop and optimize secure, scalable backend systems using Rust, collaborating with cross-functional teams. Focus on performance, security, and maintaining engineering standards.

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.

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.

Design, implement and maintain scalable, performant microservices; write automated unit and integration tests; manage deployments from testing to production; collaborate with engineering teams; translate customer requirements into deliverables and tickets.

Back-end engineer to build and scale NLPatent's AI-first patent research platform. Work with CTO and senior engineers to develop Python/Django services, containerized deployments, and relational database-backed features. Collaborate on integrating NLP/LLM capabilities and ensure production-ready systems. Hybrid role requiring three days onsite weekly.

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

The intern will participate in backend architecture design, develop backend components for overseas games, and ensure service availability.