Top Backend Developer Jobs in London

Lead backend platform engineer to design, build, and maintain Java/Spring Boot libraries and frameworks for asynchronous, distributed microservice ecosystems. Drive standardisation, tooling, SDLC practices, security and compliance, mentor engineers, collaborate with SDLC/infrastructure teams, and govern enterprise AI-assisted engineering practices to improve delivery, quality, and automation.

As a Backend Engineer, you'll build and improve technology for small businesses, focusing on developing reliable code, collaborating on projects, participating in code reviews, and enhancing operational efficiency.

The role involves designing and building cloud-native applications using Java and Spring Boot, focusing on scalable microservices for financial institutions while leading agile practices.

Lead backend engineering for Consumer Onboarding: shape roadmap, deliver high-impact projects end-to-end, ensure system health, coach and mentor engineers, and collaborate with product, design, and analytics to improve onboarding flows at scale.

The Senior Backend Engineer at Teya will design, develop, and maintain core backend systems supporting various aspects of the business, ensuring scalability and reliability while collaborating with cross-functional teams and mentoring developers.

Design, build, and own backend pricing services end-to-end for Personal & Business products. Contribute to architecture, code reviews, reliability, scalability, observability, incident response, and collaborate with product, compliance and stakeholder teams to enable pricing features and experiments.

The Senior Backend Software Engineer will design, develop, and maintain scalable backend services, optimize applications, build APIs, and collaborate across teams to improve user workflows and product efficiency.

The Senior Backend Software Engineer collaborates in teams to design and build scalable infrastructure systems, optimizing data-driven applications across sectors.

Backend Software Engineers at Palantir build scalable software solutions, collaborate across teams, and develop systems for data processing and storage, enhancing product capabilities.

Backend Software Engineers at Palantir build and maintain scalable backend services, develop APIs, optimize applications for performance, and collaborate across teams to shape user workflows.

As a Backend Engineer, you'll enhance accounting integrations, improve workflows, expand global offerings, and build a scalable platform architecture.

Lead backend engineering work using JVM languages to design scalable, reliable, secure, cloud-native, multi-cloud solutions. Drive domain modeling, performance optimization, zero-downtime releases, incident resolution, and operational excellence. Champion adoption and governance of enterprise-authorized AI-assisted engineering practices and SDLC toolchain automation while coaching teams on responsible, secure AI use.

Lead backend engineering efforts to design, build, operate and secure cloud-native microservices. Deliver reliable, tested, scalable systems, manage stakeholders, coach engineers, support production incidents, and drive adoption of approved AI-assisted development practices.

Design, build and operate cloud-native backend microservices (Java) for banking products. Ensure secure, reliable, scalable systems with strong testing, performance tuning, zero-downtime releases, and production support including incident management.

Design, build, and maintain scalable, secure, cloud-native backend systems using JVM languages. Ensure reliability, performance, and zero-downtime releases; use domain modeling, automated testing, and enterprise AI-assisted tools to improve code quality and delivery.

Lead backend engineering efforts to design, build, and operate scalable, reliable, and secure cloud-native services using JVM languages. Drive domain modeling, performance optimization, zero-downtime releases, incident remediation, automated testing, and adoption of approved AI-assisted engineering practices while mentoring teammates and promoting reusable patterns.

Lead design and deliver cloud-native backend microservices with reliable, secure, and scalable architectures. Build and test end-to-end solutions, operate production systems, drive AI-assisted engineering practices, coach engineers, manage stakeholders, and ensure high availability, performance, and secure data handling across the product lifecycle.

Design, build, test, and maintain backend services and REST APIs (Java/Kotlin, Spring Boot) on AWS. Work on high-volume payment flows (card pay-in), event-driven systems with Kafka, PostgreSQL schema and query optimisation, payment orchestration across providers, automated testing, code reviews, on-call rotations, and cross-team collaboration to ensure secure, scalable financial systems.

Build scalable, reliable backend services for global shared-finance products (international joint accounts, kid accounts). Design asynchronous microservice systems, collaborate with product/design/research, influence architecture, ensure scalability, reliability, and compliance, and deliver customer-facing features used by millions.

As a Senior Backend Engineer at DuckDuckGo, you'll lead backend projects, mentor engineers, and develop AI-enhanced features for the company's privacy-centric product line.

Ownership of backend features for Agentic Tools: design and implement GraphQL/REST APIs, build secure scalable Ruby on Rails services, improve RSpec automated tests, collaborate across product and AI teams, participate in Tier 2 on-call, and shape architecture for AI agent interactions with GitLab.

Lead development projects focusing on customer experiences and operational management. Mentor other engineers, make strategic tech decisions, and solve complex challenges while contributing high-quality code.

Build and maintain a fraud detection backend (fraud engine) for Acquiring products. Design scalable, low-latency microservices, integrate messaging and relational databases, and collaborate with Product, Data Science, and fraud teams to balance risk mitigation and seamless customer experience.

As a Backend Engineer, you'll improve Git and Gitaly by contributing features, bug fixes, and performance improvements, collaborating with the open source community, and participating in architectural discussions.

Build and maintain the Payin Platform that handles how money enters Wise. Design Payin Session and Payment abstractions, ensure reliability and scalability for high-volume transactions, collaborate across teams, write testable code, drive end-to-end ownership, and improve APIs and systems for excellent customer experience.