126 to 150 of 202 API Design Jobs in the UK excluding London

Senior Software Engineer

Location
Slough, England, United Kingdom
skilled Java Software Engineer with a growing interest and demonstrated exposure to AI/ML integration. This role is primarily Java-centric — you will design and build cloud-native microservices on our BPA (Beyond Policy Administration) platform — with the expectation that you actively apply AI tooling and patterns … prototype level. Role Details Location: London Experience: 4–7 years of overall software engineering experience Engagement Model: Full-time, Product Engineering Job Responsibilities Design and implement RESTful APIs and microservices using Java 17+ and Spring Boot 3.x. Build and maintain business logic within the BPA platform, ensuring correctness, performance ...

Senior .NET Developer

Hiring Organisation
Pontoon
Location
Bromley, Kent, United Kingdom
Employment Type
Full-Time
Salary
£700.00 - £750.00 per day
development role. You will be expected to have years of experience of commercial development experience utilising: TECHNICAL SKILLS: Deep functional knowledge or hands on design experience with Web Services (REST, SOAP, etc) Understanding of API design and documentation .NET 8.0/10 (C#) .Net CORE (C#) .NET … Framework 4.7+ Angular (v2+), JavaScript Net MVC 5.0 & Web Api 2 ORM (EntityFramework/nhibernate/Dapper) MS SQL Server 2008+, DB2 Dependency injection and frameworks, e.g. Unity Practical experience with TDD and CI/CD OTHER SKILLS: An aptitude for problem analysis and resolution and eye for details. ...

Full-Stack Data Engineer

Location
Glasgow, Scotland, United Kingdom
seeking someone to join our Data Obfuscation team as a Full Stack Developer – Data Engineering to design and deliver scalable, secure, and reusable data platforms and services that support enterprise data protection and obfuscation initiatives.In the Technology division, we leverage innovation to build the connections and capabilities that power … management in parallel execution environments.Deliver secure, high-performance and efficient database and ETL capabilities using Java Collections Framework, data structures, algorithms, and object-oriented design principles, while ensuring scalability, governance, and reliability.Design and develop full-stack applications, including responsive web user interfaces, RESTful APIs, backend services, and integrations with ...

Senior Java Backend Engineer - Leeds-Based

Location
Leeds, England, United Kingdom
distributed video recording systems and advanced reporting/analytics applications. In this role, you will be deeply involved in hands‐on development, architectural design, and cross‐studio collaboration to advance our internal ecosystem. Key Responsibilities Design & Implementation: Architect and develop robust backend solutions to meet the fast‐paced … challenges of global game development. Technical Leadership: Contribute to the team’s software design guidelines, coding standards, and architectural blueprints. Global Collaboration: Partner and collaborate with other Rockstar technology teams across our worldwide studios. Continuous Innovation: Develop a deep understanding of existing systems while researching and adopting new technologies ...

Full Stack Developer – Manchester, UK – Full Time – Manchester

Location
Manchester, England, United Kingdom
Significant experience building and running production systems on AWS (or major public cloud). Architecture: Deep understanding of Microservices and event-driven architectures, including API design and contract management. Engineering Best Practices: Strong grounding in testing (Unit/Integration/E2E), CI/CD, and Observability. Communication: Excellent ...

Full Stack Developer - Manchester, UK

Hiring Organisation
Randstad Technologies Recruitment
Location
Manchester, United Kingdom
Employment Type
Contract
Contract Rate
£46 - £90/hour
Significant experience building and running production systems on AWS (or major public cloud). Architecture: Deep understanding of Microservices and event-driven architectures, including API design and contract management. Engineering Best Practices: Strong grounding in testing (Unit/Integration/E2E), CI/CD, and Observability. Communication: Excellent ...

Full Stack Developer - Manchester, UK

Hiring Organisation
Randstad Technologies
Location
Manchester, Lancashire, United Kingdom
Employment Type
Full-Time
Salary
£46.00 - £90.00 per hour
Significant experience building and running production systems on AWS (or major public cloud). Architecture: Deep understanding of Microservices and event-driven architectures, including API design and contract management. Engineering Best Practices: Strong grounding in testing (Unit/Integration/E2E), CI/CD, and Observability. Communication: Excellent ...

AI Platform Engineer

Hiring Organisation
Addition
Location
London, South East England, United Kingdom
Employment Type
Full-Time
Salary
£475.00 per day
production-quality code. Key Responsibilities You’ll play an important role in designing, building and delivering the AI platform by: Building and evolving the API gateway and routing layer connecting teams to multiple LLM providers. Developing failover, load-shedding and resilience capabilities for periods of provider degradation. Designing orchestration … registration and discovery tooling for reusable AI capabilities. Establishing API design, versioning and promotion workflows to move capabilities from experimentation into production. Implementing RBAC and OIDC-based access controls. Supporting secure API key issuance, rotation and revocation. Applying high standards across testing, observability and technical documentation. Using ...

Mid-Level Data Engineer (Python/ AWS)

Location
Belfast, Northern Ireland, United Kingdom
cloud-based data platform. This is a hands-on role focused on designing, building, and improving data pipelines and services, while also contributing to API design and occasional frontend work where needed. You’ll work across the stack, primarily in Python and AWS, helping to deliver reliable, well … data through APIs, and supporting a platform that removes bottlenecks and enables better use of data across the organisation. What You’ll Be Doing Design, build, and maintain ETL/ELT pipelines in production environments Develop ingestion and egress patterns to support reliable data access and integration Work with ...

Staff Software Engineer (Provenance)

Hiring Organisation
Cloudsmith
Location
Belfast, UK
Employment Type
Full-time
/CD approach, deploying multiple times per day, and we support a global set of customers who are engineers like us. Key ResponsibilitiesBuild: Design, implement, and ship the provenance ingestion service — capable of accepting provenance and attestation payloads from CI/CD systems, public registries, signed bundles, and customer … designing pipelines that handle varied, schema-evolving, high-volume payloads reliably and at scale — including robust error handling and observability. Data Modelling: Ability to design storage schemas that efficiently represent signed metadata envelopes, artefact graphs, and queryable relationships. API Design: Experience building and versioning APIs consumed ...

Senior Software Engineer – Data Visualisation & Graphics | London

Location
Slough, England, United Kingdom
working on the underlying systems that make complex visualisations fast, accurate, and scalable. The challenges range from rendering performance and interaction design through to algorithms, graphics, API design, and numerical correctness. What you’ll be doing Designing and building core charting features used by developers around … exceptionally high technical standards High levels of ownership and autonomy Small team, significant impact Opportunity to deepen expertise in performance, graphics, visualisation, and systems design Package Salary up to £200,000 Hybrid working (London) Private healthcare Pension Additional benefits If you’re interested in building the technology behind modern ...

Application Architect

Hiring Organisation
Fourth
Location
Macclesfield, Cheshire, UK
Employment Type
Full-time
architecture of key strategic initiatives across Fourth. Working as an embedded member of delivery teams, you will provide hands-on architectural leadership, helping engineers design, build and evolve scalable, maintainable and resilient software solutions. You will apply Fourth's application architecture standards, patterns and engineering principles, whilecontributing to their … practical delivery experience.· Produce architectural designs, decision records, and technical documentation that clearly communicate solution intent and support long-term maintainability.· Participate in architecture, design, and code reviews, providing constructive feedback and helping ensure consistency with established architectural principles.· Collaborate with business, product, engineering, and fellow architects to understand ...

Senior Software Engineering Manager (Active Savings)

Location
Bristol, England, United Kingdom
Strong engineering background with the ability to communicate architectural decisions to both technical and non-technical stakeholders. You create guardrails based on scope, technical design, NFRs, and quality—then empower your team to innovate within them. Client- and product-focused mindset, with experience partnering closely with Product Managers … business teams. You embrace ambiguity, foster collaboration, and promote psychological safety to help teams navigate change. Hands-on knowledge of secure API design, authentication services, and mobile development (Swift/Kotlin, React Native). Knowledge and experience of modern DevOps tools and practices. Exposure to Figma and Vercel ...

Solution Architect

Location
Manchester, England, United Kingdom
history of technical leadership. Experience across the entire solutions development lifecycle from inception, through build to Production. Appreciate and acknowledge the impact of system design decisions on scalability, resilience, and supportability. Experience of API design and architecture patterns. Experience with Public&Private Cloud Solutions, (Google CloudPlatformand Open ...

Java Backend Engineer | Spring Boot, Microservices, Kafka

Location
Glasgow, Scotland, United Kingdom
GlobalLogic in Scotland is seeking an experienced Backend Engineer to design and build robust microservices using Java 17+ and Spring Boot 3. You’ll work across the full backend stack—from API design through production-grade integration testing—delivering scalable services. You will design, implement … test REST APIs, apply domain-driven design, and work with Kafka, Gradle, MapStruct and Feign to deliver resilient services in a hybrid work environment. #J-18808-Ljbffr ...

Full Stack Engineer

Hiring Organisation
Randstad Digital
Location
Manchester Area, United Kingdom
will deliver end-to-end features, working across enterprise Java and Node.js backend services while building responsive frontends using React and TypeScript. Key Responsibilities Design and deploy scalable microservices using Java (Spring Boot) and Node.js (Express/NestJS). Build modern, modular web interfaces using React and TypeScript . … week alongside cross-functional team members. Requirements Tech Stack: Demonstrated production experience across Java, Node.js, React, and TypeScript. Architecture: Strong understanding of microservices, API design, and asynchronous communication patterns. Database & Tooling: Hands-on experience with SQL/NoSQL databases, Git, Docker, and CI/CD pipelines. Location: Must ...

Principal Software Developer

Location
Cambridge, England, United Kingdom
vendor offerings and appropriate architectures and patterns for those offerings. A deep understanding of cloud-compatible architectures (such as microservices and SoA), RESTful API design considerations, and ideally, a good awareness of security and authentication considerations (OAuth is relevant). A strong academic track record including a good … addition to tailored package elements. Keywords: Principal engineer, principal software developer, C#, .NET, cloud, Azure, AWS, cloud native, containers, microservice, service-oriented, REST, API, intelligence, security, authentication, OAuth, sustainability, Cambridge, hybrid. #J-18808-Ljbffr ...

Principal Software Developer

Hiring Organisation
ECM Selection Ltd
Location
Cambridge, Cambridgeshire, East Anglia, United Kingdom
Employment Type
Permanent, Work From Home
Salary
£95,000
vendor offerings and appropriate architectures and patterns for those offerings. A deep understanding of cloud-compatible architectures (such as microservices and SoA), RESTful API design considerations, and ideally, a good awareness of security and authentication considerations (OAuth is relevant). A strong academic track record including a good … addition to tailored package elements. Keywords: Principal engineer, principal software developer, C#, .NET, cloud, Azure, AWS, cloud native, containers, microservice, service-oriented, REST, API, intelligence, security, authentication, OAuth, sustainability, Cambridge, hybrid. Another top job from ECM, the high-tech recruitment experts. Even if this job's not quite right ...

Senior AI Engineer

Location
Maidenhead, England, United Kingdom
Service Operations, Data & Analytics, Security & Quality Compliance, Transformation, Application Development, and Enterprise Platforms. Key Responsibilities Job Overview Architecture and technical strategy Contribute to the design and architecture of core platform components and evaluation systems, making the load‐bearing technical decisions and bearing accountability for their reliability, scalability, and long … capabilities are built, evaluated, and deployed across the company, and define a coherent platform vision that scales beyond your immediate team. Design reusable abstractions, SDKs, and services for model integration, prompt management, experimentation, and deployment that establish organization‐wide patterns and reduce duplicated effort. Research and delivery excellence Help ...

Senior Product Security Engineer

Location
Cambridge, England, United Kingdom
them at scale. You will work on tool integration, results processing, and the services that make analysis outputs usable by engineering teams. Key Responsibilities Design, build, and maintain core backend services for centralised security analysis and data processing. Develop Python services, APIs, and workflow components that support tool onboarding … comfortable in scripting (e.g. bash). Proven experience designing, building, and operating backend services or internal platforms in production environments. Strong understanding of API design, service-to-service integration, and backend architecture. Experience working in cloud environments, ideally AWS. Experience with containers and related tooling, for example Docker. ...

.Net Developer

Hiring Organisation
Appcast
Location
Newcastle upon Tyne, UK
C# and WebAPIProficiency in writing object-oriented code that is clear, robust, efficient, high-performing, testable, extendable, and well-encapsulatedA deep understanding of proper API design principles, coupled with experience in REST/JSON interfacesFamiliarity with MySQL databases, Memcached, RabbitMQ, and Ceph would be advantageousPrior experience in developing ...

Senior Full Stack Software Engineer

Location
Glasgow, Scotland, United Kingdom
platform into something scientists can drive — the services that schedule and execute runs across racks of robotic hardware, and the interfaces chemists use to design, launch, and monitor experiments. You will partner with firmware, hardware, manufacturing, and chemistry teams, and own meaningful slices of the platform end to end. … real-world robotic platform sounds like the right shape of job for you, we’d love to welcome you to our team. Key Responsibilities Design, build, and ship full-stack features across backend services and web front-ends, owning them from spec to production. Build and harden the systems ...

IT Software Engineer Developer

Location
Wolverhampton, England, United Kingdom
contribute to technical decisions within a collaborative team. Key Responsibilities Develop and maintain web applications using Next.js/React, focusing on performance and scalability. Design and build integrations between applications, APIs, and databases, particularly using MySQL. Write clean, maintainable, well-tested code using JavaScript, TypeScript, and C#. Take ownership … features from design through to deployment and support. Participate actively in code reviews both giving and receiving constructive feedback. Support and mentor more junior members of the team where appropriate. Report to and work closely with the Lead Software Engineer to meet project goals and timelines. This ...

Senior Java Backend Engineer: Microservices & Kafka Hybrid

Location
Glasgow, Scotland, United Kingdom
GlobalLogic in United Kingdom is seeking an experienced Backend Engineer to design and build robust, scalable microservices using Java 17+ and Spring Boot 3. You will work across the full backend stack — from API design through to production‐grade integration testing — using modern Java and Spring technologies. … will design REST APIs, implement event-driven solutions with Kafka, and collaborate with cross-functional teams. #J-18808-Ljbffr ...

Wireless Protocol Software Engineer – System API configuration

Location
Fleet, England, United Kingdom
Overview Keysight is at the forefront of technology innovation, delivering breakthroughs and trusted insights in electronic design, simulation, prototyping, test, manufacturing, and optimization. Our ~15,000 employees create world‐class solutions in communications, 5G, automotive, energy, quantum, aerospace, defense, and semiconductor markets for customers in over 100 countries. Learn … quality solutions. This position sits at the intersection of protocol standards, software engineering, and system configuration APIs, within a multi‐site international environment. Responsibilities Design, develop, integrate, and optimize APIs for system‐level configurability . Validate 3GPP protocol configurations , with specific focus on RRC configuration . Support both ...