11 of 11 Part-Time API Design Jobs in the UK

Principal Web Engineer at MHR, you're not just writing code you're architecting the future of software solutions. You'll drive excellence in every aspect, from user interface design to maintaining a high-quality code base, collaborating with like-minded Web Developers, shaping innovative solutions, and coaching the team to tackle complex business challenges head-on. Working hybrid … proof of concepts to de-risk delivery and elucidate intricate concepts. Elevate coding standards by automating processes, ensuring extensive test coverage for sustainable delivery. Provide essential guidance during planning, design reviews, and incident management to empower web engineers. Cultivate consensus among peers on cutting-edge technologies and best practices. Play a vital role in recruitment campaigns, hiring highly skilled … working on and building modern enterprise Angular applications. Solid understanding of HTML/HTML5, JavaScript/Typescript, CSS/SASS Good understanding of the following: Accessibility, Responsive and Adaptive design, working with UX/UI design documents Knowledge of the following: Web security, RESTful Web Services Experience with modern unit testing frameworks and methodologies. Strong understanding of RESTful More ❯

and stakeholders to deliver clean, efficient, and maintainable code that supports business goals and enhances user experience. Key Responsibilities Build and maintain .NET Core/ASP.NET applications and APIs Design and optimize database structures (SQL Server or equivalent) Implement best practices for coding, testing, and deployment Participate in code reviews, sprints, and agile ceremonies Collaborate with a distributed team … solutions on time and to spec What Youll Need 3+ years of professional experience in .NET development Strong proficiency in C#, ASP.NET Core, Entity Framework Solid understanding of RESTful API design and software architecture principles Experience with Azure or other cloud environments preferred Good communication skills and ability to work independently in a remote setup Nice to Have More ❯

AWS) Location: London or Manchester Employment Type: Full-time, Permanent About the Role Were looking for a Senior Software Engineer with deep experience in Python and AWS to help design, build, and scale distributed, data-driven Ad-Tech systems. Youll lead the delivery of cross-service features within a modern cloud platform, making pragmatic architectural choices and setting high … key role in shaping technical direction, mentoring engineers, and ensuring the systems you build are secure, observable, and resilient. Key Responsibilities Lead complex delivery: Drive the end-to-end design and implementation of Python-based microservices and cloud-native solutions hosted on AWS. Architect and optimise systems: Define service boundaries, data ownership, and failure-recovery patterns for scalable, high … and drive continuous improvement. Mentor and grow others: Support engineers through pairing, feedback, and documentation to strengthen technical capability across the team. Contribute to technical roadmap: Collaborate with Product, Design, and Data teams to align on priorities and ensure value is delivered incrementally. Core Tech Stack Languages: Python (FastAPI, Flask, or Django) Cloud: AWS (Lambda, ECS/Fargate, S3 More ❯

AWS) Location: London or Manchester Employment Type: Full-time, Permanent About the Role Were looking for a Senior Software Engineer with deep experience in Python and AWS to help design, build, and scale distributed, data-driven Ad-Tech systems. Youll lead the delivery of cross-service features within a modern cloud platform, making pragmatic architectural choices and setting high … key role in shaping technical direction, mentoring engineers, and ensuring the systems you build are secure, observable, and resilient. Key Responsibilities Lead complex delivery: Drive the end-to-end design and implementation of Python-based microservices and cloud-native solutions hosted on AWS. Architect and optimise systems: Define service boundaries, data ownership, and failure-recovery patterns for scalable, high … and drive continuous improvement. Mentor and grow others: Support engineers through pairing, feedback, and documentation to strengthen technical capability across the team. Contribute to technical roadmap: Collaborate with Product, Design, and Data teams to align on priorities and ensure value is delivered incrementally. Core Tech Stack Languages: Python (FastAPI, Flask, or Django) Cloud: AWS (Lambda, ECS/Fargate, S3 More ❯

Engineer to help lead the next phase of growth. The Role Were looking for an experienced Full Stack Engineer to take ownership of full lifecycle development from architecture and design through to deployment and optimisation. Youll be working across both the front and back end, collaborating with a multi-disciplinary team to build products that directly impact the future … This is a hands-on, high-impact role with real autonomy and room to grow. Key Responsibilities Build and Own Develop scalable web applications using React, Next.js, and Node.js Design and maintain secure, high-performance RESTful APIs Lead architectural decisions across the full stack Own features end-to-end, from planning through to production Collaborate Work closely with UI … Stay current with industry trends and recommend new technologies What Were Looking For Strong commercial experience with React, Next.js, Node.js, and JavaScript Solid understanding of back-end development and API design Experience working with cloud platforms (preferably AWS) Familiarity with both SQL and NoSQL databases (e.g. PostgreSQL, MongoDB) Understanding of Git, CI/CD pipelines, and secure coding More ❯

unlock new alpha opportunities. This is a chance to join a globally respected firm where AI isnt an experiment, its a business driver. What Youll Get The opportunity to design and deploy world-class AI systems used across global investment teams. A high-impact seat within a team driving technological and analytical innovation across the firm. A collaborative environment … ML libraries and frameworks. Solid background in data architecture, with proven experience across SQL, NoSQL, and graph databases such as Neo4j or Amazon Neptune. Strong understanding of distributed systems, API design, and modern deployment practices using Docker, Kubernetes, and CI/CD pipelines. Comfort working in cloud-based environments (AWS preferred), including data connectivity and infrastructure-as-code More ❯

plus excellent benefits Cheshire (hybrid) Shape the next generation of software architecture for critical medical services, with worldwide reach and millions of customers benefiting from the new technology. Design and build multi-tenant SaaS solutions, working closely with engineering squads, product owners and the senior management team, to create a first class architecture. Full application, database, security architecture. Leveraging …/large environments Experience designing and delivering cloud platform solutions, ideally with the AWS well architected framework Domain driven architecture and hexagonal architecture knowledge and experience Strong background in API design, multi-tenant applications, data structures, design patterns, testing methodologies.. Get in touch for a more detailed spec please MandyKettle@unitingambition.com Hybrid working, offices are very smart More ❯

seamlessly via APIs. This is the opportunity to make a real impact in a rapidly growing team, while working on cutting-edge AI technology. What You'll Work On: Design and implement scalable backend systems using Python (FastAPI, Flask, or Django) Integrate AI-generated code into production-ready services Take ownership of projects from idea to production collaborating across … teams Experiment with LLM- and agentic-coding workflows to accelerate development Who You Are: 5+ years of experience in back-end development (Python based stack ideally) Strong understanding of API design and systems architecture Strong communication and collaboration skills Exposure to AI, LLMs or modern ML-backed systems is a plus! Apply now or reach out directly: hhandelman More ❯

role serves as a trusted advisor to both internal and external partners within the Java ecosystem. As a Java Solution Architect, one must possess knowledge of overall architecture/design for Java implementations across multiple projects or one large complex project under the leadership of a lead Architect. Your responsibilities: Driving discussion with Client and Business Users on Solution … Design. Retrofitting Business Requirement in Java landscape based on the current architecture and Solution Design . Documenting Functional Requirement, with Solution Design. Designing and implementing scalable and flexible program architectures that support point-based tiered, and personalized structures . Integrate solutions with POS systems, e-commerce platforms, and mobile apps for seamless customer experience. Define architecture for marketing automation … platforms, campaign management systems, and CRM solutions. Design API-driven architectures for integrating third-party marketing platforms, ad networks, and analytics tools. Leverage cloud-native technologies (AWS/GCP) for scalability, performance, and cost-efficiency. Collaborate with cross-functional teams to determine the best implementation strategies for Java solutions. You must Lead and prioritization/scoping of business More ❯

of the mobile app (React Native) and backend (Node.js or Python/FastAPI). Integrate with Open Banking APIs (TrueLayer, Yapily, etc.) to securely connect and manage financial data. Design and implement pipelines to analyse transaction data and user conversations using embeddings and vector databases (Pinecone, Qdrant, etc.). Ensure best practice in data security and compliance, including OAuth2 … technical ownership in a fast-paced startup. Proficient with React Native (or strong React + mobile experience). Backend experience with Node.js or Python (FastAPI/Django) and RESTful API design. Experience integrating Open Banking APIs (TrueLayer, Yapily, Salt Edge, etc.). Hands-on experience with AI/LLM-powered systems especially embedding models (OpenAI, Cohere, Sentence Transformers) and More ❯

transformation and is looking for a Senior Security Engineer with a specialism within Cloud to help shape and secure its modern cloud infrastructure. Youll work across engineering teams to design scalable, secure cloud infrastructure and embed best practices from day one. Youll be joining at a pivotal time as the company invests heavily in scaling its security capabilities. This … wants to influence how secure, scalable systems are built in a fast-moving, AWS native environment. Senior Security Engineer, Cloud Responsibilities: Apply software development and security engineering expertise to design secure, scalable cloud solutions. Develop and maintain security baselines for cloud infrastructure (primarily AWS), including automation for configuration scanning and remediation. Act as a subject matter expert on cloud … security within engineering, providing guidance during design reviews and threat modelling sessions. Harden Kubernetes environments and enforce secure cluster configurations. Secure and manage infrastructure using Infrastructure-as-Code, with a focus on Terraform. Senior Security Engineer, Cloud Requirements: 5+ years of hands-on experience in cloud security, with deep expertise in AWS. Strong background in secure infrastructure design More ❯