Top Backend Developer Jobs in London

Build and operate scalable backend services and data pipelines for Spotify’s music content ingestion platform. Responsibilities include ingesting and validating audio, metadata, lyrics, and partner content; designing stable APIs and schemas; improving data quality, real-time validation, reliability, and operational tooling; leading technical projects; participating in planning, code reviews, and on-call; and mentoring engineers while collaborating with content, partner, operations, and product teams.

Build and scale backend systems for Wise’s Product Eligibility platform, determining which products and features are available to customers. Responsibilities include shaping technical vision, developing distributed systems, designing APIs and database schemas, optimizing queries, supporting platform and back-office tooling, contributing to customer-facing flows, and collaborating in an agile team with product and analytics partners.

Designs and develops backend services for Trainline’s insurance products using C# and .NET. The role includes making technical decisions, mentoring engineers, owning software from development through deployment and monitoring, improving code quality, and removing delivery blockers. Responsibilities involve building scalable microservices and event-driven systems, working with AWS and infrastructure tooling, maintaining observability and reliability, and collaborating across engineering and product disciplines.

Build and operate AI backend systems, agentic workflows, RAG pipelines, evaluations, and LLM-powered data pipelines. Develop data-layer capabilities, monitoring, inspection interfaces, and production-grade software across Python, Dagster, PostgreSQL, Elasticsearch, and Iceberg. Collaborate with product, research, and commercial teams, own technical projects and PoCs, and balance security, quality, and delivery speed in a high-ownership startup environment.

Build scalable backend systems and customer-facing financial products for Wise’s shared-finance offerings, including international joint accounts and kid accounts. Collaborate with product, design, data, and research teams to shape ambiguous ideas, influence architecture and product direction, and deliver reliable systems globally. Work includes money movement, spending, authorization, compliance-related systems, shared-account infrastructure, greenfield development, and infrastructure scaling.

Build and maintain backend services and APIs supporting disputes, returns, refunds, auto-cancellation, and AI-driven customer support. Develop integrations with order, payment, shipping, and support systems; design reliable, secure, event-driven solutions; and own monitoring, on-call, testing, deployments, and technical debt. Collaborate with Product, Design, Data Science, Payments, Shipping, and CX Operations while running experiments and feature-flagged releases to improve customer issue resolution.

Develop Rust software for managing and adapting cloud resources in Kubernetes environments. Collaborate on architecture, infrastructure, and feature design while debugging distributed systems and engaging directly with users. The role requires production Rust experience, cloud-native infrastructure knowledge, and familiarity with datastores, message brokers, and GitOps tooling. Experience with developer tools, Kubernetes operators, or DevOps platforms is preferred.

Develop and maintain scalable .NET backend services, REST and GraphQL APIs, and microservices. Design SQL Server schemas, optimize queries, implement Entity Framework Core data access, and build secure authentication flows. Collaborate in Agile teams with product, frontend, and QA stakeholders. Write automated tests, apply Clean Architecture and DDD, resolve performance and production issues, maintain API documentation, and support Azure DevOps CI/CD, Docker, monitoring, and structured logging.

Build backend systems that make automated biology labs programmable. Responsibilities include architecting data pipelines for protein characterization data, developing APIs integrating laboratory instruments and robotics, and translating molecular biology workflows into reliable, scalable software. The role involves collaborating with scientists and automation engineers, processing heterogeneous physical-instrument data, and supporting highly autonomous AI-driven experimentation infrastructure.

Develop and maintain scalable Atlassian cloud products using Kotlin, Java, and server-side technologies. Responsibilities include writing clean, testable code, creating unit and integration tests, conducting code reviews, designing APIs, optimizing performance, and collaborating with product, design, QA, and technical writing teams. The role requires building distributed systems using Kubernetes and AWS, working with SQL and NoSQL databases, and solving complex customer and product challenges autonomously in a remote environment.

Design, build and operate backend services in AWS for a multi-service hospitality platform. Implement new features, payment and EPOS integrations, improve performance, monitoring and deployment automation using TypeScript/Node.js and databases like Mongo Atlas, Postgres RDS or DynamoDB. Collaborate in a UK development team and automate infrastructure, CI/CD and QA.

Architect and develop high-load backend systems in Elixir, design scalable distributed solutions, and improve ticketing and event-management platforms. Lead technical discussions, translate requirements into specifications, mentor engineers, conduct code reviews, and promote testing, documentation, maintainability, and production ownership. Optimize PostgreSQL and Redis performance, integrate third-party services, understand Linux internals, and address system bottlenecks and traffic spikes.

Leads high-impact backend and financial operations projects involving payments, transactions, middleware, GraphQL schemas, APIs, and data models. Provides staff-level technical leadership, drives architectural decisions, partners cross-functionally with Product and Design, and improves engineering standards such as testing, code review, documentation, and SDLC practices. Works hands-on across project delivery while shaping company-wide engineering culture and technical direction.

Design, develop, and maintain high-performance C++ backend services for real-time sensor data processing. Build distributed, containerized applications, APIs, analytics pipelines, and cloud-connected systems across Linux and Windows. Integrate Python algorithms, improve scalability and reliability, support CI/CD and testing, remediate vulnerabilities, and contribute to architecture and technical direction. Collaborate internationally with engineers, data scientists, product managers, and domain experts throughout the software lifecycle.

Build and scale Teton’s backend infrastructure for real-time data from thousands of healthcare edge devices. Responsibilities include distributed ingestion systems, event pipelines, APIs, databases, MQTT communication, cloud deployment, reliability, observability, performance optimization, and production debugging. The role supports critical alerts and operational workflows used by healthcare staff.

Build scalable backend infrastructure and distributed systems for Palantir’s data platforms. Responsibilities include developing search and indexing systems, data processing libraries, container orchestration, APIs, observability, storage, authentication, asset serving, and automated deployment of technologies such as Cassandra, Elasticsearch, Kafka, and Kubernetes. Collaborate with technical and non-technical stakeholders while delivering reliable, secure, high-performance software.

Build and operate scalable AWS cloud infrastructure centered on Amazon EKS, networking, infrastructure-as-code, and self-hosted services. Automate shard deployments, implement Terraform guardrails and secure ingress, support multi-region growth, and meet reliability, disaster recovery, compliance, and security requirements. Partner cross-functionally, troubleshoot application and infrastructure issues, participate in on-call and incident response, and use AI tools to improve engineering workflows.

Lead hands-on backend engineering using Java, Spring Boot, REST APIs, and Kafka-based services. Own technical direction, delivery, architecture, testing, integrations, and DevOps practices while mentoring engineers and championing AI-assisted development. Manage workstream risks, timelines, bottlenecks, client communication, estimation, and delivery planning in a fast-paced consultancy environment.

Build, maintain, and scale e-commerce backend services using Python and Django. Develop REST APIs and features for catalogs, inventory, carts, checkout, orders, payments, and customer accounts. Integrate external services, optimize databases and performance, implement security and access controls, write tested code, resolve production issues, and contribute to architecture, code reviews, deployment, and CI/CD.

Lead the technical direction and architecture of the Foundations platform team, owning authentication, authorization, SSO, secrets management, tenancy, and core platform services. Design APIs, drive services through launch, make technical decisions, establish engineering standards, and mentor engineers without formal management authority. Partner with engineering and product leaders to align execution with priorities.

Design, build, and operate high-throughput backend services, APIs, real-time streaming applications, and data pipelines. The role includes using Kafka, Flink, and cloud infrastructure; monitoring system health and data freshness; investigating incidents; improving observability, testing, CI/CD, and maintainability; and collaborating with product and platform teams to deliver scalable maritime intelligence solutions.

Build and maintain scalable backend services primarily in Go, develop microservices, migrate legacy systems, and collaborate with product and data teams on technical designs. Optimize systems for latency, reliability, and heavy-load performance while applying clean code, TDD, domain-driven design, and continuous delivery practices.

Build and maintain scalable backend services and microservices primarily in Go. Collaborate with product, design, and data science teams to create technical solutions, migrate legacy services, and optimize systems for latency, reliability, and heavy workloads using TDD, DDD, and continuous delivery.

Build and maintain high-performance backend services for mapping, including road matching, ETA prediction, geospatial processing, and routing. Develop Go microservices, migrate legacy systems, collaborate on technical designs, and optimize latency and reliability under heavy load. The role requires scalable backend experience, database and messaging expertise, and hands-on mapping or geospatial experience. Work involves TDD, domain-driven design, continuous delivery, AWS, Kubernetes, and infrastructure managed with Terraform.

Build and maintain scalable backend services primarily in Go. Develop microservices, migrate legacy systems, collaborate with product and data teams on technical designs, and optimize systems for performance, latency, reliability, and heavy-load responsiveness using modern cloud and infrastructure technologies.