Top Backend Developer Jobs in London

Design and develop cloud services using JVM technologies, focusing on high availability and scalability while implementing automated delivery with CI/CD pipelines.

Build and maintain high‑reliability backend services for clearing and payments. Design APIs and domain logic, ensure scalability, observability, security and compliance, participate in on‑call and incident response, write comprehensive tests, and collaborate with Product and Cross‑functional teams to deliver production systems.

Nango is hiring Senior and Staff Backend Engineers to design, build, and optimize backend systems and APIs, collaborating with customers and driving product strategy.

Take end-to-end ownership of backend features and SaaS services in a microservices architecture. Design, implement, deploy, and operate scalable, reliable Node.js services. Work with Redis Streams, MongoDB, Kubernetes, and ensure test coverage, performance tuning, and collaboration with cross-functional teams.

Lead technical execution and micro-architecture for backend platform services. Own design, implementation, and operation of scalable, resilient blockchain-integrated backend and indexing systems. Mentor engineers, enforce engineering standards, drive AI-first practices, write production Go and TypeScript code, and collaborate with Product, Security, DevOps, and Infrastructure teams.

Lead development of ICE's copyright product: design and implement scalable AWS-based microservices, collaborate with product teams, conduct code reviews, own technical decisions, mentor engineers, champion quality and testing, and explore AI-assisted engineering to improve productivity.

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.

The Software Engineer (Python) role involves developing and maintaining an AI platform, building scalable APIs, and collaborating with cross-functional teams to enhance AI workflows for financial firms.

As a Software Engineer, you'll design and build backend systems, develop APIs and microservices, and ensure system reliability while collaborating with cross-functional teams.

As a Senior Engineer at NALA, you will drive the architecture and implementation of the collections and treasury foundation, design APIs, and ensure quality in financial-grade systems.

As a Backend Engineer, you will design and maintain scalable backend systems, focusing on performance and reliability, primarily using Rust or C++. You will work with distributed systems and various databases while contributing directly to production infrastructure.

As a Senior Backend Engineer at Contentful, you will develop AI integrations and platform features to enhance the internal AI ecosystem while collaborating with cross-functional teams to innovate AI-driven solutions.

Build, operate, and extract guest-facing backend services for a high-traffic booking platform using PHP and Go. Design APIs for agentic interfaces, improve performance and page speed, collaborate with Product and Design, and leverage AI coding tools to accelerate delivery while contributing to architecture and migration from a monolith to service-oriented systems.

Lead design and delivery of a greenfield trust accounting backend: build secure, scalable, auditable financial services, enforce quality and observability, collaborate with product/finance/legal, and mentor engineers.

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 Backend Engineer will write high-quality Go code, implement microservices, manage legacy service migration, and optimize system performance.

Develop and maintain scalable backend services, focusing on TDD, DDD, and CI/CD. Collaborate with teams to optimize systems and code quality.

The Senior Backend Engineer will develop scalable backend services using Go, optimize systems for performance, and collaborate with teams on technical designs.

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.

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 own backend systems powering matters, documents, permissions, agent actions, and workflows. Design core product APIs, data models and pipelines, agent-facing primitives, and ensure production reliability through deployments, observability, and performance work.

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.

As a Backend Engineer at Trust Wallet, you'll develop backend features for multiple platforms, maintain infrastructure, ensure system monitoring, and foster team growth.

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

Design and build high-performance backend services and APIs in Go to manage datasets, model assets, metadata, and workflow orchestration. Ensure scalability, reliability, observability, and CI/CD-driven deployments. Collaborate with frontend, product, and platform teams, contribute to architecture, resolve production issues, and support AI/ML evaluation pipelines and human-in-the-loop workflows.