Top Backend Developer Jobs in London

Lead cross-functional Developer Experience initiatives across six teams, contributing hands-on backend code in Ruby and Go. Improve testing reliability, test coverage, CI/CD pipelines, logging standards, and development environments. Partner with engineering, platform, product, and infrastructure teams to identify friction, remove systemic bottlenecks, shape the Developer Experience Platform strategy, and foster continuous engineering improvement.

Own technical direction and execution for major products and systems. Design scalable backend, frontend, API, database, and infrastructure solutions; write code; prototype; review code; debug production issues; make architecture trade-offs; convert ambiguous problems into execution plans; improve engineering quality; lead critical initiatives; and mentor engineers.

Manage end-to-end firmware feature delivery for residential EV chargers: define scope, coordinate cross-functional stakeholders, own release readiness and rollouts across variants and markets, set success metrics, oversee testing, monitoring and multi-market launches, and translate local requirements into firmware scope.

Build and ship end-to-end product features across web, mobile, and backend systems. Own product functionality, improve code quality, testing, reliability, and engineering practices, and participate in on-call rotations. Collaborate with product and design, contribute to technical discussions and code reviews, mentor junior engineers, and use AI-powered tooling to improve development effectiveness.

Design and build scalable backend systems for Spotify’s commerce platform, supporting purchases, billing, invoicing, receipts, and payments. Develop high-scale distributed services and data pipelines, improve performance, reliability, and observability, and contribute to architecture decisions. Collaborate with engineering, product, and data teams, participate in code reviews and technical discussions, and modernize legacy systems while maintaining stability.

The Backend Engineer will build secure, scalable backend solutions for Tether, ensuring high performance and security while utilizing Node.js and microservices architecture.

Design, develop, and maintain scalable, secure backend systems for fintech products. Build REST APIs and microservices supporting card payments, treasury management, transaction booking, and crypto liquidity. Work primarily with Java, PostgreSQL, and Spring Boot while applying clean code, TDD, DDD, and CI/CD practices. Collaborate with a high-performing team to deliver greenfield and existing-system improvements.

Leads technical direction and hands-on execution for major products and systems. Designs scalable backend, frontend, API, database, and infrastructure solutions; writes code; drives architecture decisions; solves production issues; improves engineering quality, reliability, security, testing, and observability; and mentors engineers across teams.

Own technical direction and execution for major products and systems. Design scalable and reliable architectures, write production code, lead architecture decisions, solve complex engineering problems, and drive initiatives from concept through production. Improve engineering quality across testing, security, observability, and development practices while mentoring engineers and coordinating work across teams and products.

Lead the technical direction and hands-on development of Push, a regulated non-custodial financial product. Design resilient backend services for payment initiation, transaction tracking, settlement, exceptions, notifications, partner integrations, blockchain execution, and customer wallets. Establish secure architecture, testing, observability, incident response, deployment, and on-call standards while leading engineers through complex, high-impact work and partnering with product, compliance, legal, security, operations, and finance teams.

As a Senior Backend Engineer at DuckDuckGo, you'll lead backend projects, mentor engineers, and develop AI-enhanced features for the company's privacy-centric product line.

Own an AI-agent-driven backend engineering workflow for multi-tenant data platform services. Create precise specifications, operate agentic delivery pipelines, build MCP and sandbox infrastructure, and engineer behavioral verification systems. Evaluate generated solutions for scalability, reliability, performance, and security; diagnose production data issues; and collaborate with engineering, support, analytics, and product teams. The role requires strong .NET/C#, PostgreSQL, SQL, architecture, specification writing, agent infrastructure, and scenario-based testing expertise.

Design and scale backend services, REST APIs, microservices, data pipelines, database schemas, caching layers, and event-driven systems for AI-powered media workflows. Integrate machine learning models into production, optimize performance and reliability, implement observability, resolve incidents, and collaborate with ML, DevOps, frontend, and product teams.

Build and operate backend services, APIs, infrastructure, integrations, and automation for business intelligence platforms. Own platform lifecycle management, identity and access automation, observability, reliability, security, CI/CD, and developer experience. Collaborate with data, analytics, engineering, product, and business teams to deliver scalable self-service capabilities. Use AI engineering tools and potentially develop governed LLM-backed features.

Lead development projects focusing on customer experiences and operational management. Mentor other engineers, make strategic tech decisions, and solve complex challenges while contributing high-quality code.

The role involves hiring exceptional engineers who can handle ambiguous problems, build end-to-end solutions, and ensure production-grade quality. Candidates should thrive in evolving environments.

Build and operate GitLab’s Gitaly backend storage systems, focusing on distributed storage, Git repository management, reliability, scalability, performance, and observability. Own complex technical initiatives end to end, lead system design, collaborate across engineering and customer-facing teams, mentor engineers, improve development practices, respond to incidents, participate in on-call duties, and implement operational improvements for production systems.

Design, build and operate backend services in AWS for a multi-service hospitality platform. Implement new features, payment and EPOS integrations, improve performance, monitoring and deployment automation using TypeScript/Node.js and databases like Mongo Atlas, Postgres RDS or DynamoDB. Collaborate in a UK development team and automate infrastructure, CI/CD and QA.

Build and maintain scalable backend services for neobanking features including transfers, open banking, savings, and payments. Own projects end to end, lead infrastructure migrations, shape architecture, review code, and improve reliability through observability and incident response. Collaborate with product, design, data science, security, and operations teams while supporting engineering best practices in a regulated fintech environment.

Build and maintain the Payin Platform that handles how money enters Wise. Design Payin Session and Payment abstractions, ensure reliability and scalability for high-volume transactions, collaborate across teams, write testable code, drive end-to-end ownership, and improve APIs and systems for excellent customer experience.

Design and build scalable backend systems and microservices using Go. Lead testing, security, code quality, and continuous delivery practices; collaborate with clients, present technical solutions, mentor colleagues, and balance delivery speed with long-term system maintainability and performance.

Build and maintain backend AI capabilities for GitLab Duo Chat: design flow components and agentic flows in Python/LangGraph, integrate LLMs and multi-agent orchestration, implement and maintain APIs in the Rails monolith, improve observability and reliability, and participate in on-call rotations and cross-functional collaboration to deliver safe, scalable AI chat features.

Build tooling, workflows, and guidance to make GitLab easier to deploy, validate, and operate across cloud-native and self-managed environments. Evolve deployment guidance, improve production-like ephemeral environments, and maintain consistent deployment artifacts and environment contracts across development through production.

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.

Design, build, and maintain Aalyria’s cloud-native Spacetime platform for 5G non-terrestrial networks and Direct-to-Cell services. Develop distributed backend systems using C++, Golang, Java, gRPC, Protocol Buffers, and Kubernetes. Translate 3GPP and O-RAN specifications into tested software, build orchestration and federation APIs, integrate platform components, document implementations, and troubleshoot production issues.