Top Backend Developer Jobs in London

Lead end-to-end projects for Pyroscope: design, build, and operate ingestion, storage, and query for a distributed profiling database. Drive product decisions, participate in customer calls, own on-call rotations, improve operational excellence and cost, collaborate across Grafana teams, and contribute to the open-source Pyroscope project.

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

Design, build, and operate core backend systems powering the Curie platform (APIs, data pipelines, graph databases, integrations with AI models). Own feature lifecycle from design through deployment and monitoring, improve observability and reliability, write well-tested maintainable code, collaborate with ML researchers and domain experts, and mentor peers.

As a Senior Product Engineer (Backend), you'll design and develop APIs and SDKs for embedded insurance and retirement benefits, focusing on system architecture, incident response, and enhancing developer experiences.

Lead backend architecture and delivery for large-scale multiplayer game services. Architect distributed systems, write code, deploy infrastructure, mentor engineers, liaise with clients, design cost estimates, enforce best practices, and drive CI/CD, security, and production readiness.

Design, build and maintain backend services for multiplayer games. Implement distributed systems, CI/CD, containerised microservices, databases (SQL/NoSQL), cloud infrastructure, and documentation. Collaborate on estimates, support teammates, and ensure high-quality deployments and operational standards.

Design, build, deploy and maintain backend services for large-scale multiplayer games. Collaborate with peers and stakeholders on estimates, implement features, ensure CI/CD, docs, security, and support team members while operating autonomously in a remote environment.

As a Senior Backend Engineer, you'll design and maintain core libraries for blockchain transactions, enforce security boundaries, and contribute to best practices in a post-quantum environment.

Design, build, operate, and maintain multi-tenant telemetry databases (metrics, logs, traces) for Grafana Cloud. Deliver features end-to-end, participate in on-call rotations, contribute to open-source projects, collaborate remotely, and improve reliability, performance, and scalability of distributed systems running on Kubernetes and major cloud providers.

As a Junior Backend Software Engineer, you will design and implement scalable backend services, collaborate on features, and optimize performance while gaining mentorship and experience in a supportive environment.

Build and maintain scalable backend and platform infrastructure powering enterprise-grade LLM workloads. Design systems across APIs, data flows, job orchestration, observability, and reliability to accelerate product teams and ensure high-throughput, low-fragility LLM processing for large customers.

The role involves developing digital solutions, leading teams in Agile and DevOps environments, and mentoring while ensuring high-quality Java-based systems development and testing.

Join the Payments cross-functional team to design and build scalable backend services used by millions. Produce high-quality code, collaborate with product and design, follow agile practices, own testing and reliability, and iterate using A/B testing and data-informed decisions.

Design, build, and maintain cloud-native, scalable backend services. Write clean, tested Python (with occasional Go/Rust), operate production systems on AWS, use IaC (Terraform), containerization (Docker, Kubernetes), and observability tools (Prometheus, Loki). Collaborate with product, research, and engineering teams to define requirements and ensure reliability, security, and performance.

Design, develop, and maintain highly scalable microservices and backends (Java/Spring) for millions of users. Collaborate with product owners, perform code reviews, respond to production incidents, mentor junior engineers, participate in team ceremonies, and potentially share on-call duties.

Mid-level .NET backend engineer responsible for delivering new features, owning the development lifecycle from code to production, ensuring quality, improving the codebase, mentoring teammates, working on high-volume transactional systems with asynchronous processing, and supporting deployment, CI/CD and monitoring.

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, 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.

Design and build core backend systems for an agent platform: orchestration, durable execution, memory, tool integration, observability, and evaluation. Create scalable services/APIs, develop retrieval and long-term memory solutions, monitor and improve agent behavior, and help drive technical direction and team growth for AI-driven collaboration features.

Lead design and implementation of backend services and distributed systems for real-time AI automation. Build scalable, observable microservices, streaming data pipelines, and async event-driven architectures. Collaborate across frontend, product, and DevOps to ensure performance, reliability, and seamless integration at scale.

Develop and maintain the backend ecosystem for the Alta Video Management System, focusing on cloud-based distributed systems and coding quality.

Design, build and maintain backend microservices using Java 17+, Spring Boot and related stack. Integrate third-party platforms, ensure performance and scalability, own technical decisions end-to-end, balance feature work with technical debt, and mentor junior engineers.

Lead a platform team owning shared backend services and frameworks used across engineering. Balance hands-on development, architectural ownership, roadmap delivery, and line management to improve developer experience, service health, and reliability.

Build and maintain production Golang backend services and data pipelines for an AI-driven investment platform. Design APIs, improve performance, reliability, and observability, debug production issues, and collaborate with AI and product teams to ship scalable, low-latency systems.

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