Top Backend Developer Jobs in London

Own the strategy, vision, and roadmap for Depop’s internal API platform and backend enablement capabilities. Partner with engineering, platform, and product teams to understand developer needs, identify service gaps, shape scalable technical solutions, and define success metrics. The role requires strong API knowledge, technical product management experience, stakeholder influence, and the ability to communicate complex initiatives clearly to technical and non-technical audiences.

Own and evolve iwoca’s German Lending API, developer portal, partner integration tools, broker workflows, and CRM automation. Define API architecture, versioning, and technical direction while delivering features such as pre-qualification. Collaborate with product managers, commercial teams, and UK engineers; mentor teammates, support partner onboarding, and participate in support rotations. The role requires hands-on Python backend engineering, production API ownership, AI-enabled workflows, and clear communication.

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 and manage a cross-functional engineering team to deliver and scale customer-facing products. Own architecture, delivery, reliability, observability, and production outcomes. Coach engineers, run reviews, improve processes and tooling, and drive technical decisions across frontend, backend, APIs, databases, integrations, and infrastructure.

Lead and manage a cross-functional engineering team to design, build, and operate production systems. Own technical architecture, delivery, reliability, and processes. Coach engineers, run reviews, resolve incidents, and drive product outcomes while balancing speed, scalability, and quality.

Lead and manage a cross-functional engineering team to deliver reliable, scalable wealth-management products. Drive architecture, code quality, observability, incident response, and engineering culture while coaching engineers and improving processes to increase delivery speed and reliability.

Develop and maintain integrations between voize and German senior care/hospital software. Design scalable REST APIs and data models, take end-to-end ownership from architecture to implementation, collaborate with partners, and improve caregiver workflows. Remote across Germany with occasional travel to Berlin; minimum 3+ month freelance engagement.

Design and implement APIs, data pipelines, and services powering digital-asset trading experiences. Build and aggregate trading protocols, aggregators, and trade types; develop features for Phantom’s web platforms; support new blockchain integrations and complementary products; engage directly with users and developers; and contribute to team growth and hiring standards.

Build and maintain backend services for Octopus Energy’s global retail technology platform. Collaborate with marketing, operations, data, and engineering teams to deliver reliable, fault-tolerant products that support affordable and sustainable energy. Responsibilities include backend development using Python and Django or equivalent frameworks, domain modeling, GraphQL, asynchronous processing with Celery, and PostgreSQL. AWS and Kubernetes experience is beneficial.

Build and own event-driven microservices for M-KOPA Mobility’s electric-mobility financing platform. Responsibilities include designing C#/.NET backend solutions, managing production systems, applying DevOps and infrastructure-as-code practices, implementing automated testing and continuous delivery, and using observability tools such as Prometheus and Grafana. The role involves collaborating across global teams, contributing to architecture decisions, monitoring services, and leveraging AI coding tools such as Claude Code.

Build and maintain backend systems and APIs powering real-time accounting logic. Design architecture, ship features end to end, manage CI/CD, testing, monitoring, integrations, and production readiness. The role requires strong database expertise, complex business logic experience, AWS deployment skills, and a pragmatic, fast-moving approach to engineering.

Design and build highly available, low-latency payment services for iwoca’s business credit card. Own backend projects end to end across authorization, transaction monitoring, rewards, testing, ledger integration, and production launch. Shape platform architecture, build microservices and APIs, work with asynchronous messaging and databases, and collaborate with product, fraud, ledger, and customer teams. The role requires expertise in production payment systems, card authorization and clearing flows, distributed systems, object-oriented backend development, and responsible use of AI engineering tools.

Design, develop, and maintain scalable backend applications using TypeScript, Node.js, and NestJS. Collaborate across engineering and product teams throughout the software development lifecycle, integrate APIs and cloud services, troubleshoot performance issues, and apply security best practices. Contribute to REST, event-driven, and microservice architectures while writing tests and documentation. Provide technical guidance to junior developers and help shape architectural and technology decisions.

Lead backend development of Aether's core platform: design and build high-performance APIs, implement complex business logic, scale services for 3D modeling, simulation, and proposal workflows, and influence system architecture in an early-stage environment.

Build and evolve scalable backend services, infrastructure, and product features for Too Good To Go’s international marketplace. The role involves Java and Spring Boot development, API design, quality-focused coding, agile collaboration, and maintaining reliable systems in AWS and Kubernetes. Engineers will work with cross-functional teams, contribute to architectural decisions, and help establish a new London engineering hub while supporting product scalability, maintainability, and sustainability.

Design, implement, and evolve complex backend capabilities for GitLab’s global DevSecOps platform. Drive architecture and technical direction, improve quality, security, availability, performance, and operational readiness, and participate in incident response. Mentor engineers, lead through technical influence, collaborate asynchronously across product and infrastructure teams, and integrate reliable agentic AI systems into production engineering workflows.

Designs, builds, deploys, monitors, and supports backend services powering an enterprise AI platform. Responsibilities include developing APIs, AI gateway and orchestration capabilities, multi-tenant systems, entitlements, metering, integrations, data access patterns, and platform services. The engineer owns services end to end while addressing reliability, distributed-system failure modes, testing, operational support, and developer experience.

Design, build, and optimize Phantom’s streaming blockchain data platform, including scalable ETL pipelines, data models, schemas, quality frameworks, observability, and high-availability systems. The role delivers accurate, low-latency token, price, and spam data to engineering teams, collaborates cross-functionally, and contributes to team growth. Experience with backend systems, modern data engineering, and Web3 or on-chain data is expected.

Build scalable backend services, APIs, microservices, and event-driven solutions supporting personalization, recommendations, search, and AI-driven consumer experiences. Integrate AI/ML capabilities, develop React components, implement search using Elasticsearch or OpenSearch, and work with Kafka, databases, Redis, and cloud-native architectures. Ensure systems are secure, observable, resilient, and low latency while collaborating with AI/ML, data, and engineering teams.

Build and operate scalable backend APIs, microservices, and integration services powering personalization, recommendations, search, and AI-driven consumer experiences. Own features from design through deployment, monitoring, and support. Collaborate with AI/ML and data engineering teams, improve service performance and reliability, contribute to system design and engineering standards, and mentor junior engineers.

Owns global technical recruiting for AI/ML, software engineering, infrastructure, web, and mobile teams. Responsibilities include developing recruiting strategy, leading critical searches, partnering with engineering leadership, setting hiring standards, building and coaching a technical recruiting team, improving recruiting processes through data and market intelligence, and expanding talent networks across the US, Europe, and Asia.

Designs, builds, and operates scalable backend services, APIs, microservices, and event-driven systems supporting personalization, recommendations, search, and AI-driven consumer experiences. Partners with AI/ML, data, product, and engineering teams; integrates search and generative AI capabilities; improves performance, reliability, observability, security, and operational excellence. Leads technical delivery, mentors engineers, contributes to architecture reviews, and promotes engineering best practices.

Build and maintain payments infrastructure, including usage tracking, pricing, billing, payment providers, and stream-processing services. Collaborate with Finance, Tax, Growth, Sales, and engineering teams to support compliance, reporting, experiments, and customer payments. Plan migrations, debug complex production billing issues, and safely evolve live systems handling money. Requires Python expertise, backend development experience, software and system design knowledge, testing and security fundamentals, and strong problem-solving ability.

Build and operate core platform systems for users, workspaces, permissions, APIs, authentication, and resource management. Deliver full-stack features with a backend focus, including admin and settings interfaces. Scope work within large existing systems, plan migrations, manage safe rollouts, debug production issues, and collaborate across product and engineering teams. Candidates need strong Python and backend development expertise, software and system design knowledge, testing and security fundamentals, and the ability to navigate ambiguity.