Backend Developer Jobs in Wales, United Kingdom

Telematics team at Radius builds a multi‑environment SaaS platform that powers connected vehicle solutions worldwide. As a Backend Developer you design, build, and maintain secure microservices in NodeJS/Typescript, collaborate with cross‑functional teams, and drive CI/CD pipelines on AWS. The role is based in Crewe, UK, with a hybrid work model (remote and onsite).

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.

Obsidian Security, founded 2017, builds a SaaS security platform protecting Microsoft 365, Salesforce, and other cloud apps. As a Backend Engineer, you will develop scalable, reliable backend systems powering the core product, build APIs, and collaborate with product managers, designers, and senior engineers.

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 Engineering team building and scaling backend systems that power advanced AI-driven capabilities for enterprise applications. The role designs reliable, high‑performance distributed workflows, collaborates with data scientists to turn predictive models into production services, and ensures observability, scalability and performance of extension capabilities.

Prograd, an innovative fintech platform empowering the next generation with financial knowledge, is building scalable backend systems for its digital education services. The Backend Engineer will design and implement high‑performance Node.js services, GraphQL/REST APIs, and AWS cloud infrastructure while managing PostgreSQL databases and event‑driven architectures.

Security & IT – IT team builds a high‑scale, real‑time digital platform serving millions of active users. The Backend Engineer designs and builds robust microservices, implements system logic, and ensures performance and reliability in a cloud‑native, containerized environment.

AppCore Stacks squad at Grafana Labs builds the control‑plane services that create, reconcile, and operate Grafana Cloud stacks at scale. The role designs and maintains stateful systems that keep stack configuration aligned across grafana.com, Hosted Grafana, and cloud regions, ensuring reliable customer provisioning and safe rollouts.

Backend Engineering team delivering advanced software solutions for global enterprise clients. Leads the design, building, and scaling of modern backend systems, integrating AI/ML capabilities and guiding engineering practices across distributed cloud platforms.

Backend Engineering team builds scalable backend services for high‑performance digital products. The Senior Backend Developer will maintain and enhance existing PHP and Golang services, design and deploy new microservices, and optimize databases and caching for high‑load environments.

Backend Engineering team at Piktochart builds the core services for a global visual storytelling SaaS platform. The Lead Backend Engineer designs and evolves scalable, secure, high‑performance architecture, mentors engineers, and collaborates with product, design, and frontend teams to deliver integrated solutions.

Backend Engineering Team builds high‑impact backend systems powering internal operations and client‑facing products. The role designs, develops, and maintains robust Ruby on Rails services, integrates distributed technologies like Kafka, GraphQL, Docker, and Kubernetes, and collaborates with product and infrastructure engineers to ship scalable features.

ABS seeks a skilled Backend Engineer for its AI Practice Team to design and scale high‑performance backend systems powering real‑time analytics and RAG pipelines.

Barclays Capital Securities seeks a Junior Backend Engineer to design, develop and improve scalable software that powers business and platform capabilities for customers and colleagues. The role focuses on building Python‑based services, leveraging AWS, Docker/Kubernetes, and CI/CD pipelines, while collaborating closely with product managers, designers and fellow engineers to deliver high‑quality, secure solutions.

Parser’s core backend engineering collective builds high‑performance data processing platforms. The Senior C++ Engineer designs and implements scalable, resilient systems, modernizes legacy components, and collaborates with data scientists and cloud architects.

Methods Business and Digital Technology LimitedMethods is a £100M+ IT Services Consultancy who has partnered with a range of central government departments and agencies to transform the way the public sector operates in the UK. Established over 30 years ago and UK-based, we apply our skills in transformation, delivery, and collaboration from across the Methods Group, to create end-to-end business and technical solutions that are people-centred, safe, and designed for the future.Our human touch sets us apart from other consultancies, system integrators and software houses - with people, technology, and data at the heart of who we are, we believe in creating value and sustainability through everything we do for our clients, staff, communities, and the planet.We support our clients in the success of their projects while working collaboratively to share skill sets and solve problems. At Methods we have fun while working hard; we are not afraid of making mistakes and learning from them.Predominantly focused on the public-sector, Methods is now building a significant private sector client portfolio.Methods was acquired by the Alten Group in early 2022.Methods is currently recruiting for a Senior Back End Developer to join our team on a permanent basis.

voize UK Market squad builds integrations that connect voize with senior care and hospital software platforms. As a Freelance Senior Backend Engineer you will develop scalable APIs, design data models and own end‑to‑end integration projects.

Liberty Blume seeks a Senior Backend Engineer to lead the design, development, and deployment of Python‑based microservices on Google Cloud. The role is a 12‑month fixed‑term contract with potential for permanent placement, operating in a hybrid model with two days in the Leeds or Bradford office and three days remote.

Submission Processing team builds advanced AI-powered systems that transform complex industry decision-making. As a Staff Backend Engineer you will design, build and scale backend services and LLM-based workflows handling billions of unstructured data points, own architecture and drive technical direction.

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.