Backend Developer Jobs in United Kingdom

OrganOx is a commercial-stage organ technology company, part of the Terumo Group, pioneering normothermic machine perfusion (NMP) with its metra® platform to improve outcomes for patients with organ failure. The Backend Developer is a hands-on role within the Digital team, designing, developing, testing, and maintaining secure cloud services, APIs, databases, and Microsoft Azure cloud-native solutions that underpin OrganOx digital products and directly impact clinical outcomes.

Backend Engineering at Bjak builds the core systems behind the AI Neobank app, enabling reliable APIs, workflows and financial product infrastructure at scale. The role designs and implements backend services for onboarding, payments, cards, transfers, rewards, travel, FX, KYC and risk, while ensuring reliability, security and observability.

Engineering team at Yapily builds a secure, scalable open banking platform that powers leading companies. The Senior Backend Developer designs and implements high‑performance Java/Spring microservices, integrates AI coding agents to boost developer velocity, and collaborates with product and support to resolve critical issues.

Waracle's digital technology consultancy drives intelligent product innovation for ambitious clients. As a Principal Backend Developer you will lead architecture design, cloud‑native strategy and data solutions across multiple squads, mentor senior engineers and shape technical standards.

The role is part of the Accounting team at Subcompany1, focusing on building and maintaining backend services using PHP. The developer will design APIs, integrate with databases, and ensure high performance and reliability of financial applications. Based in London with an on-site work model.

At Mustard Systems, we leverage statistical modeling to dive into sports events and help us make informed predictions about future outcomes. By utilising our unique datasets, advanced statistical models, and custom-built software, we strive to accurately forecast sports results.

Zaizi's Backend Development team builds robust digital solutions for UK government services. The Senior Software Developer designs, codes, and debugs Golang systems, integrates Docker/Kubernetes, and collaborates in multi‑disciplinary Agile teams.

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.

BLP Digital is redefining ERP automation with agentic AI, building AI agents that automate finance, procurement, logistics, and sales for large enterprises. The Platform Team owns shared services, APIs, the data access layer, and the component and design system.

Token Factory at Nebius builds a next‑generation platform that lets companies seamlessly integrate AI into products and workflows. The senior backend engineer designs and scales distributed systems in Go and Python, ensuring high‑performance inference and reliability across cloud infrastructure.

Methods Business and Digital Technology Limited builds end-to-end business and technical solutions for public and private sector clients. The Backend Java Developer will develop and enhance Market Risk applications, shape tooling for risk management, and work within an Agile squad applying DevOps practices.

Principal Backend Engineer leading Java architecture for global financial platforms. Drives secure, scalable microservices on AWS, mentors teams, champions engineering excellence, and shapes enterprise strategy.

Methods is a £100M+ IT Services Consultancy partnering with central government departments and agencies to transform public sector operations in the UK. As a Backend Developer, you will join a digital delivery team to design, develop, and maintain secure, scalable backend services and APIs using TypeScript, AWS, and serverless architectures. You will work collaboratively within an agile multidisciplinary team to deliver robust solutions for public-facing digital services.

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.

Semiconductor Manufacturing Team at Lumentum develops advanced thin‑film and metal deposition processes for photonic devices. The Senior Process Development Engineer (Backend) leads new process creation, qualification and continuous improvement across backend wafer processing, leveraging SPC, Six Sigma and Lean methodologies.

Palantir seeks a Backend Software Engineer to build scalable, high‑performance services that power data‑driven decision making. The engineer will design and maintain distributed systems, craft robust APIs, and collaborate with cross‑functional teams to deliver seamless user experiences.

Zaizi's Platform Engineering team builds secure, high‑performance backend services for UK government digital projects. As a Software Developer you will design, code and test Go‑based systems, maintain CI/CD pipelines with Docker and Kubernetes, and collaborate with product owners, UX designers and platform engineers.

Backend Java Developer – Data Fabric / Platform Engineering role at NextWave Consulting focuses on building core backend services for a Data Fabric platform, implementing deterministic policy engines, SQL parsing and transformation, integrating with distributed data platforms, owning API contracts, building production‑grade pipelines, driving observability, reliability, performance, and contributing to architecture decisions.

Principal Backend Engineer – Java. Lead design and development of secure, scalable backend systems for global financial clients. Architect distributed microservices and event‑driven AWS solutions, guide technical decisions, champion engineering excellence, and coach teams to deliver high‑performance platforms.

Updraft, a fast‑growing UK fintech, seeks a Senior Backend Developer to build scalable, secure server‑side components that power its credit and lending products. The role involves designing microservices, integrating third‑party APIs such as Modulr, Truelayer and Checkout.com, and automating operational workflows.