Top Backend Developer Jobs in London

Design and build scalable backend services and APIs (Java, gRPC, GCP) powering Spotify's free-to-paid subscription journey. Collaborate with cross-functional teams, support global launches, mentor engineers, lead technical initiatives, and champion operational excellence for systems serving millions of users.

The Senior Backend Engineer will build key backend services for an observability platform, manage data pipelines, work with open-source contributors, and tackle scalable backend system design challenges.

Own and scale the ingestion pipeline and backend abstractions for high-throughput AI tracing data. Optimize ClickHouse schemas and queries, operate Langfuse Cloud and self-hosted deployments, and build infrastructure-heavy features that enable product engineers to ship data-heavy capabilities.

Build backend services, APIs and workflows for BJAK's finance super app across insurance, payments, wallet, savings, investing and travel. Design reliable systems for accounts, transactions, partner integrations, reconciliation, notifications and operations. Integrate with banks, payment gateways and insurers; improve reliability, observability, security and performance. Work cross-functionally with product and mobile teams to ship customer-facing journeys and ensure systems meet regulatory and operational requirements.

Join Suade's graduate programme to build backend RegTech systems: translate regulatory requirements into Python code, design and extend core reporting components, collaborate with regulatory specialists and engineers, participate in code reviews, testing strategies, and continuous product improvement.

Design, implement, test, and operate backend systems, APIs, and infrastructure at scale. Collaborate with product, UX, and engineers early in feature design, ensure performance, security, resilience, and maintainability, mentor peers, and use AI-assisted coding tools responsibly.

Design, build, and scale backend services for a global AI-first benefits platform. Own core services across benefits, payments, allowances, and reporting; ensure reliability, security, performance, and data integrity; collaborate with product, frontend, data, and customer teams; write well-tested production code and contribute to architecture and engineering standards.

Build and scale backend services for a global AI-first benefits platform. Design architecture, own core services (payments, allowances, reporting), model data, improve reliability/security/observability, automate workflows, integrate third-party services, collaborate across teams, and write well-tested production code.

Join the CX squad to build and ship backend features for recipient-facing products and integrations. Implement, test, monitor services, participate in code reviews, and collaborate with Product and UX to measure impact and improve customer experience.

Design, develop, and maintain high-performance, secure Java backend services and APIs. Ensure reliability, scalability, and cost-efficiency across microservices, databases, messaging systems, and capacity planning. Troubleshoot, profile, benchmark, and optimize systems (including ML applications) and collaborate with Kazakhstan stakeholders.

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.

Lead design, implementation, and long-term maintenance of complex backend systems. Drive architecture and technical decisions, mentor engineers, improve observability, reliability, and performance, collaborate with product and data, identify and remediate infrastructure weaknesses, and contribute to hiring and technical standards.

As a Senior Data Engineer, you will design and build data pipelines, ensure data quality, and improve pipeline reliability while collaborating with cross-functional teams.

Build and maintain backend microservices using Java 17+, Spring Boot and related technologies. Collaborate cross-functionally to design scalable, maintainable solutions, balance feature delivery with technical debt, ensure high-quality secure code, and optimise performance of live applications.

Develop and maintain backend services and APIs, ensure system reliability, and collaborate in a fast-paced team environment.

The Backend Developer will engage in application development focusing on coding, debugging, and collaborating with cross-functional teams to provide technical solutions and improve backend infrastructure.

As a Backend Engineer, you will build AI-first internal tools, develop data architecture, and automate processes for the commercial team.

The role involves developing digital solutions, working in Agile environments, and collaborating in multi-disciplinary teams, focusing on Golang coding and testing.

Build and maintain high-volume backend services and APIs using PHP (Laravel/Symfony). Optimize database queries, implement queues and event-driven patterns, write unit and feature tests, apply SOLID/OOP principles, debug across the stack, and collaborate with product and senior engineers. Participate in a paid on-call rotation to ensure global service reliability.

Build and maintain backend tools for AGI safety research: eval libraries, orchestration for parallel agentic evaluations, LLM proxy and telemetry, CI optimizations, data warehousing, and researcher-facing tooling. Lead feature development, collaborate with researchers, and promote good software design and reliability.

Build scalable backend systems to ingest, process, and store large volumes of AI agent logs in real time. Design APIs, authentication, rate limiting, webhooks, and SIEM integrations. Implement data pipelines, storage for structured and unstructured data, caching, retention policies, monitoring, observability, and reliability strategies. Collaborate with researchers and frontend engineers to translate prototypes into production-ready, secure, low-latency monitoring products.

As a Senior Backend Engineer, you will design and build scalable Java services, optimize data pipelines, and improve backend systems while collaborating with cross-functional teams at Spotify.

The Senior Back-End Software Engineer designs, develops, and maintains scalable backend systems while taking ownership of the software development lifecycle.

The Lead Backend Engineer will design scalable backend systems, mentor engineers, integrate AI, and define architecture for Midnite's back office platform.

The role involves back-end development using .NET Core and SQL, contributing to Jibble 2.0 API integrations, and collaborating with product and design teams.