Top Backend Developer Jobs in London

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

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.

Leads engineering across multiple full-stack web, backend, and mobile squads within Trainline’s Customer Growth pillar. Manages Engineering Managers, develops talent, oversees complex delivery, guides technical strategy and architecture, and connects railcard, subscription, retention, and customer value domains. Partners with Product, Design, Data, and Commercial teams to drive business outcomes. Champions engineering quality, innovation, monitoring, alerting, incident management, operational excellence, and a high-performing, inclusive culture.

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.

Develop and improve backend pricing, discounting, subscription, payment, and financial reporting systems for a large-scale electric vehicle charging platform. Monitor and debug applications and infrastructure, maintain asynchronous processing systems, support payment issue resolution, and collaborate with cross-functional teams to deliver robust, scalable software.

Build and maintain scalable backend systems, APIs, and partner integrations for embedded lending flows. Own projects from scoping through production, collaborate with engineers and stakeholders, improve customer conversion through experiments, and use data to guide product decisions. The role emphasizes robust system design, clear documentation, pragmatic delivery, AI-assisted development, and measurable impact for partners and small-business customers.

Develop and scale Lightning AI’s backend platform using Go, spanning APIs, infrastructure, billing, security, and integrations. Own features end to end, design reliable and scalable systems, improve architecture and performance, maintain software quality and continuous delivery, reduce technical debt, and mentor engineers. Collaborate with engineering, product, and design teams in a fast-changing SaaS environment.

Backend Engineer responsible for designing systems, developing Python backend services, APIs, data processing, automation, and web application functionality. The role includes technical leadership on projects, code reviews, mentoring, experimentation, refactoring, documentation, and collaboration with product, financial, legal, and editorial teams. The engineer will work primarily with Flask, FastAPI, PostgreSQL, AWS, Lambda, Docker, and ECS.

Build Python-based backend services, APIs, and integrations that embed AI capabilities into a SaaS platform. Develop scalable customer-facing features, connect AI outputs to workflows and dashboards, collaborate with product, design, and platform teams, and implement observability, monitoring, and error handling. Contribute to the AI integration stack, including SDKs, MCP servers, and LLM orchestration.

Designs and maintains scalable Ruby on Rails backend services, performant REST APIs, database schemas, and complex business logic. Optimizes PostgreSQL queries, caching, and background jobs while ensuring reliability, security, and code quality. Partners with product and frontend teams, leads system design, mentors engineers, reviews code, owns features through deployment, and resolves production issues. The role also drives engineering standards, technical improvements, testing, and continuous delivery.

Set long-term technical strategy for backend identity systems, lead major distributed-system initiatives, ensure operational availability, establish engineering quality standards, collaborate cross-functionally, and mentor engineers. Build and launch highly available systems supporting international expansion, KYC verification, identity data management, decisioning, regulatory compliance, and global risk models.

Build and operate high-traffic backend services for Universal Wallet, supporting fiat and stablecoin deposits, withdrawals, balances, integrations, and settlement. Develop across Python and Kotlin/Java stacks, design APIs and event-driven systems, improve architecture and observability, review code, and participate in on-call production support. Collaborate asynchronously across teams, influence technical decisions, and deliver reliable financial infrastructure.

Own and improve the company’s backend data and orchestration platform, including external integrations, event-driven pipelines, storage, monitoring, backend services, infrastructure, security, and access management. Build reliable systems with freshness and quality checks, simplify a rapidly grown data environment, document processes, communicate trade-offs, and guide junior engineers. The role requires hands-on production ownership in a remote, fast-paced company.

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

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 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.

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.

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.

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.

Leads backend architecture and streaming services for high-volume maritime tracking and trade data. Builds Python and PHP microservices, Kafka pipelines, and PostgreSQL and ClickHouse data systems. Owns production reliability, observability, CI/CD, and containerized deployments while collaborating with product, platform, and client-facing teams. Mentors engineers, drives modernization, and establishes technical standards.

Lead cross-functional Developer Experience initiatives across six teams, contributing hands-on backend code in Ruby and Go. Improve testing reliability, test coverage, CI/CD pipelines, logging standards, and development environments. Partner with engineering, platform, product, and infrastructure teams to identify friction, remove systemic bottlenecks, shape the Developer Experience Platform strategy, and foster continuous engineering improvement.

Manage end-to-end firmware feature delivery for residential EV chargers: define scope, coordinate cross-functional stakeholders, own release readiness and rollouts across variants and markets, set success metrics, oversee testing, monitoring and multi-market launches, and translate local requirements into firmware scope.

Own technical direction and execution for major products and systems. Design scalable backend, frontend, API, database, and infrastructure solutions; write code; prototype; review code; debug production issues; make architecture trade-offs; convert ambiguous problems into execution plans; improve engineering quality; lead critical initiatives; and mentor engineers.

Build and own backend services, APIs, workflows, and financial infrastructure for an AI neobank. Responsibilities include supporting onboarding, payments, accounts, cards, transfers, rewards, travel, FX, KYC, and risk flows; integrating with financial partners and third-party platforms; and ensuring reliability, security, scalability, observability, and data integrity. The role collaborates with product, frontend, mobile, and AI teams to deliver production systems for millions of users.

Build and ship end-to-end product features across web, mobile, and backend systems. Own product functionality, improve code quality, testing, reliability, and engineering practices, and participate in on-call rotations. Collaborate with product and design, contribute to technical discussions and code reviews, mentor junior engineers, and use AI-powered tooling to improve development effectiveness.