Backend Developer Jobs in Wales, United Kingdom

The FollowScores team at bet365 builds the technology behind its popular football scores app, scaling the platform to serve millions of fans with real-time updates. As a Backend Developer in Stoke-on-Trent, you will build high-performance Golang microservices and manage systems delivering data via web sockets and REST APIs.

Backend Java Developer with deep expertise in Java 17/21, Spring, JDBC, and SQL parsing. Builds deterministic policy engines, data‑governance services, and high‑throughput pipelines for a Data Fabric platform.

Digital Transformation Team builds enterprise-grade digital experiences using Adobe Experience Manager. The Senior AEM Backend Developer designs, develops and maintains scalable AEM solutions, creates custom components, services and integrations, and ensures high performance and code quality.

The FollowScores team at bet365 builds technology for its popular football scores app, scaling the platform to serve millions of users with real-time updates. As a Backend Developer, you will build high-performance Golang microservices and manage systems delivering data via web sockets and REST APIs.

Turnblock.io backend team builds modular services for a tokenization platform. The Backend Developer (NodeJS) designs, implements, and maintains NodeJS/Express APIs, integrates third‑party RESTful services, and collaborates with frontend and blockchain engineers to deliver scalable products.

Engineering team at Boxbar Tech builds the technology platform that powers automated self‑service drinks across stadiums and events. The role develops Android kiosk features, backend services and payment integrations, and contributes to architecture and reliability improvements.

Engineering Team at payabl. builds scalable, high‑performance backend services for fintech and payments platforms. The Senior Backend Python Developer designs and implements Python microservices, integrates third‑party APIs, and drives performance improvements using AWS, Docker, and CI/CD pipelines.

Internal Platforms team at YourCode builds and maintains core internal services for the company. The Senior Backend Developer designs, implements, and optimizes backend solutions using C#, Azure, and Kubernetes, writes testable code, and guides technical direction.

GitLab's Flow Components team builds the Flow Registry, providing reusable primitives for agentic flows on the GitLab Duo Agent Platform. As a Senior Backend Engineer, you will develop secure, scalable Python backend capabilities using LangChain and LangGraph across the Duo Workflow Service and GitLab monolith, while collaborating across the stack with JavaScript and frontend work to support the Duo Agent Platform client and CLI. This is a full-time, remote role based in the United Kingdom.

Developer Publications team at Apple builds and maintains the backend services that power content creation, distribution, and analytics for Apple platforms. The role designs, implements, and optimizes server-side components, collaborates with cross-functional engineers, and ensures high performance and reliability.

Engineering team at Monzo builds scalable financial products for millions of customers. As a Staff Backend Engineer you will design and implement resilient Go services, collaborate with product, design, and data teams, and contribute to open‑source projects while supporting core banking, payments, or fintech collectives.

Engineering Teams at Monzo design and build the in‑house banking platform, enabling customers to manage money securely and intuitively. As a Senior Backend Engineer you’ll collaborate in a squad to develop resilient services using Go, Java, Cassandra and Kafka, contributing to core banking, payments and AI‑driven fraud detection.

Engineering team at Monzo builds and scales the in‑house banking platform serving millions of customers. The Backend Engineer III designs, implements and maintains resilient Go services using Cassandra, Kafka, Kubernetes and cloud infrastructure, collaborating across product and data teams.

Grafana Alerting squad builds the core alerting platform for Grafana Cloud, enabling users to manage and scale alerts across on‑prem and cloud environments. The Staff Backend Engineer designs, builds, and operates distributed systems for alert ingestion, evaluation, and delivery, driving projects from ideation to production while mentoring teammates.

Digital team at Lush focuses on building a robust digital platform for global e‑commerce. The Backend QA Engineer ensures APIs, databases, and microservices are reliable, secure, and performant by designing automated test suites and conducting load and security testing.

Engineering at Obsidian Security builds the SaaS security platform that protects enterprises worldwide. As a Senior Backend Engineer you will design and implement high‑performance backend services, APIs and multithreaded processing systems, and evolve existing infrastructure for scalability and resilience.

Predictive Intelligence engineering team at Anaplan builds the backend services powering the Syrup platform and forecasting solutions. As an Associate Backend Software Engineer, you will develop and maintain Python APIs, data processing pipelines, and integrate ML models into production, collaborating with data scientists and platform partners.

Observability Platform team at Nebius builds a unified ecosystem for logs, metrics, traces and alerting to help engineers operate systems at scale. The Senior Backend Software Engineer will design and scale core services for high‑volume telemetry ingestion, distributed storage and query engines, and enhance AI‑assisted troubleshooting features.

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.

Senior Backend Engineer to build petabyte‑scale observability platform at HyperDX, focusing on high‑throughput data pipelines, API design, and developer experience. Own backend services in TypeScript/Node.js, collaborate with open‑source community, and design scalable systems ingesting petabytes of telemetry.