Top Backend Developer Jobs in London

Design, develop, and optimize high-performance Java backend systems. Contribute to architecture, implement core modules, troubleshoot production issues, perform code reviews, and improve scalability, availability, and reliability of distributed financial or blockchain systems.

Design, build, and maintain backend API and database services for a cloud PBX platform. Drive architecture, performance optimization, debugging, CI/CD and test automation, and collaborate with QA. Mentor peers and raise engineering standards while safely evolving high-load, networked systems.

Lead technical delivery for a high-profile, cloud-native advertising and audience insights platform. Hands-on coding in Java and React, design scalable AWS-based microservices, mentor distributed teams, own CI/CD and architecture decisions, and collaborate with product and senior stakeholders.

Maintain and support client websites by writing clean, scalable C# back-end code (MVC). Troubleshoot and profile applications, follow security best practices, participate in code reviews, contribute to planning and estimations, and collaborate with support and technical teams.

Design, build, and maintain distributed backend systems powering real-time and analytical data processing. Optimize data pipelines for low latency and high throughput, drive architecture and reliability decisions, collaborate with cross-functional teams, and mentor engineers through reviews and knowledge sharing.

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.

Design and build core on-chain and backend systems for a perpetual futures DEX, focusing on performance and simplicity. Responsibilities include implementing exchange logic and optimizing systems for efficiency.

The Staff Backend Engineer will lead design, development, and deployment of software solutions against identity fraud, mentoring junior engineers and managing complex engineering projects while ensuring scalability and security in architectures.

The Senior Backend Developer designs and develops server-side logic for web applications, optimizes performance, mentors juniors, and translates business needs into technical solutions.

Lead and mentor engineering teams, design and build Python microservices, ensure system resilience and scalability, and improve CI/CD processes.

The Full-Stack Engineer will enhance backend functionality, collaborate with teams, and maintain platform performance and security, requiring expertise in Python.

Develop and maintain the xAI API for high-throughput inference, managing model serving infrastructure, request routing, and scaling.

The Staff Backend Engineer will own the Economic Core of Voyagu's Radar platform, focusing on financial systems architecture and ensuring revenue correctness and financial logic implementation across the system.

The Backend Engineer will implement new SDK and Indexer features, automate testing, support integration, and oversee production releases.

Join the Grafana Backend Services squad to design, build, and operate backend APIs and orchestration infrastructure for Grafana Cloud and On‑Prem. Deliver new features end-to-end, participate in design reviews, run on‑call rotations, mentor teammates, contribute to open-source, and collaborate across squads to improve reliability, developer experience, and operational scalability.

The role involves owning product feature development, participating in system design, and maintaining software performance in an agile setting.

Develop and maintain server-side components for Tempo's flagship Jira Cloud products using Kotlin/Java. Design scalable distributed systems and APIs, write unit/integration/performance tests, optimize performance and database queries, collaborate with product, design, QA and docs teams, and contribute to code reviews with a focus on security, UX, and maintainability.

The Senior Backend Engineer will develop reliable cloud services, engage in teamwork, and address complex challenges primarily using Golang, Java, and Python.

As a Backend Engineer, you will design scalable APIs, create Engineering Requirement Documents, and build test suites for product analytics and performance.

Work as a senior backend engineer on cross-functional teams building APIs, tools and integrations. Design, ship and maintain secure, reliable, scalable production systems; propose and implement agentic/automation workflows with verification loops; participate in code reviews, mentoring, support rotations, and cross-team initiatives; contribute to platform improvements, observability, and product feedback.

The role involves leading the mk8s Core Team, managing technical projects, coaching engineers, and participating in hands-on coding and incident response.

The backend developer will build backend software focusing on reliable APIs, ensure high-quality output, and collaborate with teams.

As a Senior Python Backend Engineer at VidRush, you'll build AI-driven video production systems, ship production-level ML/LLM services, and work closely with product teams while ensuring high autonomy and delivery speed.

Build and scale core observability services for high-volume telemetry ingestion, distributed storage, query engines, alerting pipelines, and AI-assisted troubleshooting. Work on reliability, performance, and production incident resolution across a cloud AI platform.

Design and develop scalable applications and services, translating business requirements into technical solutions while ensuring code quality and performance. Collaborate within an Agile team, participate in code reviews, and mentor junior developers.