Backend Developer Jobs in United Kingdom

Backend Developer (Java) at Capco. Join Capco’s Engineering team in Edinburgh to build scalable backend services for financial services and energy domains. Design and implement Java (11/17+) APIs and microservices, deploy on AWS, and contribute to architecture discussions.

Backend team at Bjak builds the core systems behind the AI Neobank app, delivering reliable APIs and financial product infrastructure at scale. The role designs, implements, and maintains services for onboarding, payments, cards, transfers, KYC, and risk flows while ensuring security, latency, and observability.

Data Engineering (DE) team at Optimove builds AI‑powered Positionless Marketing. The Backend Developer designs and deploys scalable data pipelines, micro‑services, and data tools for product teams.

Autodoc seeks a Backend developer for Marketplace integration. Join the MPC team to manage auto parts listings on eBay and Amazon.

Backend Developer (Java) at Capco in Glasgow. Join a hybrid engineering team focused on financial services and energy.

TransPerfect seeks a Backend Developer (.NET C#) to join its global TechOps team in London. The role focuses on building scalable, secure backend services and APIs for web and mobile applications.

Conduct Platform Engineering builds the AI operating system that powers enterprise-scale LLM workloads. As a Backend Engineer you will design and own core infrastructure, developer tooling, and production systems that keep product teams fast and unblocked.

Developer Experience (DX) team at UserTesting builds internal platforms and tools that enable engineers to ship high‑quality software quickly. As a backend engineer, you’ll build and maintain backend services and internal tools, contribute to CI/CD systems, and automate friction points in the development lifecycle.

Skinandme Engineering builds the core commerce and clinical journey for Skin+Me, Hair+Me and Renew+Me, delivering personalized skincare at consumer scale. As a Backend Engineer you will design and implement Python/Flask APIs, data models and services that power consultations, prescriptions and order generation, while collaborating with senior engineers and occasionally making React front‑end tweaks.

Skin + Me engineering team builds a personalised skincare commerce and clinical platform that scales consultations, prescriptions and order fulfilment. As a Backend Engineer you will design and implement Node.js/TypeScript APIs, data models and services, ship features from ticket to production and ensure reliability at consumer scale.

xAI seeks a Backend Engineer to build and maintain scalable production systems for grok.com and its API. The role focuses on designing reliable distributed services, ensuring observability, and managing databases like PostgreSQL, Clickhouse, and MongoDB. Candidates should have deep expertise in Rust or C++, and experience with distributed systems, observability, and container orchestration.

Affinidi Elements Platform team builds secure, high‑performance backend services for decentralized identity solutions. The Senior Backend Engineer leads Rust‑based system design, performance optimization, and cloud‑native deployment on AWS, while mentoring peers and driving architectural standards.

Backend Engineer (Monitoring) at Apollo Research focuses on building scalable, real‑time systems to process AI agent logs, design secure APIs, and integrate with SIEM tools. The role requires strong Python expertise, cloud and containerization skills, and experience with large‑scale data pipelines.

Backend Engineer at Miro’s AI Platform team will architect and build the core services that power AI across the company. You’ll design scalable, high‑performance backend systems for model training, inference, and experimentation, and create tooling that accelerates reliability, reproducibility, and speed of AI delivery.

Backend Engineer at 9fin focuses on designing, building, and maintaining scalable backend services using Python, Flask, and FastAPI. The role leads technical initiatives, mentors junior developers, and collaborates across product and client teams to deliver robust APIs and data processing pipelines.

Monzo is a UK digital bank dedicated to simplifying banking for everyone. We’re looking for a Backend Engineer III to join our squads across Core Banking, Business Banking, Wealth, and more.

Backend Engineer at Sana will design and maintain scalable, resilient systems powering the company’s AI and learning platforms. Working with Node.js (TypeScript) or Kotlin backends, the role focuses on data flow, cloud deployment, and orchestration to deliver value to users worldwide.

Reteam is looking for a Backend Engineer to develop and maintain scalable backend services, collaborate with product and frontend teams, and ensure high code quality and performance. The role involves designing APIs, optimizing database queries, and contributing to DevOps practices.

Proveden Ltd, a London-based voice AI startup building real-time interpretation infrastructure, seeks a Backend Engineer to design and build the core API platform that powers instant, tone‑accurate translation across languages. The role involves architecting high‑concurrency systems on Azure, implementing usage metering, billing pipelines, and monitoring dashboards.

Data, Technology and Analytics team at WPP Media builds the fastest, most connected data platform to bridge marketing strategy to scaled activation. As a Backend Engineer you’ll design and build APIs and services using C#, .NET Core, TypeScript and React, deploy to Azure with Terraform, and collaborate with product, UX and DevOps to deliver secure, performant solutions.