Top Backend Developer Jobs in London

Design, build, and operate backend systems for an AI platform: agentic workflows, document ingestion and search at scale, streaming execution, APIs and data models. Own features end-to-end from ideation to production, measure impact, and maintain services in production.

As a Product Engineer, you'll build, iterate, and maintain scalable software systems, collaborating with cross-functional teams to deliver impactful products.

As a Backend Engineer, you will build payment infrastructure, tax engines, and systems for international commerce while collaborating with a team of experienced engineers.

Own and architect high-throughput Node.js payment microservices handling fiat transactions across multiple currencies and regulatory jurisdictions. Design resilient, traceable, idempotent, and reconciliable systems; lead banking and payment-partner integrations; and operate AWS infrastructure, CI/CD pipelines, databases, caching, monitoring, and on-call processes. Drive technical roadmaps, author design documents, mentor engineers, collaborate with Risk, Compliance, Product, and Operations, and maintain security and compliance standards for financial data.

Design, build and maintain backend services for real-time and analytical data processing. Own features end-to-end, optimise for low latency and high throughput, ensure observability and incident response, contribute to design reviews, and collaborate cross-functionally to maintain service health and scalability.

Lead the Managed Kubernetes Core team while remaining hands-on with backend engineering. Responsibilities include writing and reviewing code, leading technical projects, maintaining technical vision, participating in on-call and incident response, coaching 4–8 engineers, and collaborating on product strategy. The role focuses on Kubernetes control planes, cluster autoscaling, platform integrations, add-ons, GPU infrastructure, and managed cloud services.

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, build, and scale Node.js backend services for a MERN-based, real-time platform. Improve performance, reliability, and fault tolerance; design APIs and database schemas; collaborate on architecture, code reviews, and operational ownership. Mentor peers, contribute to hiring, and drive engineering standards.

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.

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

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

The Senior Backend Software Engineer will design, build, and maintain scalable backend systems. Responsibilities include collaboration with teams, API implementation, and ensuring best practices in software engineering.

Design, build, and maintain high-scale backend systems and data APIs. Implement new endpoints and data feeds, write automated tests, monitor and operate cloud-native infrastructure, and collaborate with product and engineering to deliver and upgrade services.

Own and deliver large-scale backend infrastructure projects end to end, including architecture, deployment, monitoring, and impact measurement. Build reliable distributed systems, performant APIs, database and processing systems, and production services that operate under heavy load. Contribute to code reviews, testing, rollouts, and mentoring while solving complex problems autonomously and planning for significant future scale.

As a Product Engineer focused on Backend, you'll enhance backend infrastructure, design APIs, improve reliability, and support innovative features at Granola.

You will build backend infrastructure for a digital energy platform, working on real-time systems and customer energy pipelines while adapting to business needs

As a Senior Product Engineer, you'll build AI-powered workflows, enhance billing infrastructure, and ensure the reliability of production backend systems while collaborating with a small cross-functional team in a fast-paced environment.

Design and develop scalable server-side components, integrate APIs, automate workflows, and collaborate with teams on financial solutions.

Join Databricks as a Staff Software Engineer focusing on backend development, responsible for building reliable, high-performance services and features for data platforms, tackling challenges in distributed systems and service architecture.

The Senior Backend Engineer will develop features, improve code quality, mentor others, and manage the development lifecycle while focusing on customer priorities and technical decisions.

Design, build, and maintain transaction-related backend services using Java and Spring Boot. Develop core order and transaction workflows, ensure data consistency and system reliability under high concurrency, participate in requirements, design, and code reviews, and document technical solutions. Work onsite in London.

Build scalable backend systems for BJAK’s AI Finance Agent, including APIs, workflows, multi-provider insurance integrations, quote comparison and ranking, customer data systems, secure audit trails, cloud infrastructure, CI/CD, observability, and security controls. The role requires reliable handling of timeouts, retries, partial failures, sensitive data, and integrations across markets and partners.

Build and operate a storage access platform: design and implement storage abstractions, database automation, client SDKs/proxies, CDC pipelines, caching, and hot/cold storage management for a multi-region, highly available system, enabling internal developer onboarding and platform reliability.

Design, build, test, and operate scalable backend services, APIs, and microservices. Work on distributed systems, asynchronous workflows, messaging, and event-driven architectures. Troubleshoot production issues, improve reliability and observability, participate in code reviews, CI/CD, and collaborate cross-functionally from design through production.

Develop and maintain FortiDLP server-side services, building APIs, databases, and integrations. Own features from design through delivery, write and review code and tests, ensure code quality and secure practices, collaborate cross-functionally, and support high-volume data pipelines and operational tasks as needed.