Top Backend Developer Jobs in London

Design, architect, and develop scalable Go-based microservices and REST APIs for threat detection, case management, and incident response. Lead system design, own technical initiatives, mentor engineers, integrate AI/LLM capabilities, operate cloud-native services on Docker/Kubernetes and cloud platforms, participate in on-call rotation, and drive reliability and architectural improvements.

As a Principal Backend Engineer, you will build scalable backend services with Java, design APIs, implement microservices, and work with AWS cloud technologies.

Design and build production-grade backend services and APIs for contact center systems using serverless AWS (Lambda, API Gateway). Implement observability (OpenSearch, CloudWatch, Kibana, Snowflake), integrate third-party telephony platforms, create AI-enabled automation and migration tooling to modernize legacy contact center workflows.

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 client accounts as a senior technical advisor, identifying opportunities and driving account growth. Translate business needs into scalable, secure full-stack architectures across cloud, data, integration, and DevOps. Support proposal development, oversee solution design and delivery, mentor engineers and architects, and contribute to practice IP and engineering best practices. This is a billable, client-facing director role focused on strategic technical influence and delivery quality.

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.

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

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 Staff Backend Engineer at GitLab, you'll enhance backend infrastructure for CI, integrate AI features, and ensure reliability and performance in CI/CD workflows.

Build, ship, and maintain backend features enabling AI agents to interact with GitLab. Design GraphQL/REST APIs, extend tests (RSpec), work with PostgreSQL, troubleshoot production issues, and collaborate cross-functionally to integrate AI tooling responsibly.

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.

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.

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 scale Wise's Acquiring Platform to receive international payments. Design and implement backend services and RESTful APIs, integrate payment methods (Google Pay, Apple Pay, PIX, UPI), expand platform into ecommerce stores and PSPs, work on distributed systems, collaborate with stakeholders, and deliver shippable milestones.

Lead and build scalable backend services for European accounts using Java/Kotlin and Spring Boot. Design account-level features, work with product and analytics, drive architecture, mentor engineers, and deliver data-driven solutions for local payment methods and account products.

As a Senior Backend Engineer, you'll oversee the Secrets Manager's architecture and development, ensuring secure handling of credentials and collaborating on backend solutions.

Senior PHP backend engineer to develop and maintain the Xodo Sign eSign platform. Work in a Scrum team across requirements, design, implementation, testing, and maintenance; build and scale REST APIs; optimize performance and security; perform code reviews; research and propose product enhancements; and promote engineering best practices.

Lead and design backend platform architecture, build data integrations and automations, guide a small multidisciplinary team, partner with Product, mentor engineers, unblock delivery, and ensure scalable, fault-tolerant systems for low-carbon tech deployments.

Lead development and production deployment of proprietary LLM-based algorithms and high-scale evaluation pipelines. Implement advanced prompt engineering, ship evaluation frameworks, and work across the stack (Python, Postgres, TypeScript/React) to translate research into production-ready AI products.

Own, design, build and maintain backend services for neobanking features (transfers, open banking, savings, payments). Lead end-to-end delivery, migrations, observability, incident response, architecture and code quality. Collaborate with product, design, data, security and operations to ship reliable, regulated fintech features.