26 to 50 of 133 API Design Jobs in the UK

pragmatic decision making Act as an escalation point for complex cross team technical challenges Ensure architectural decisions are clearly communicated, understood, and consistently applied Design and Innovation Define and maintain architectural patterns across backend services, APIs, data platforms, and front end systems Design scalable, resilient systems for analytics … data stores, favoring open standards and long term maintainability Architect distributed systems with focus on reliability, fault tolerance, and scalability Standards & Governance Establish API design standards ensuring consistency, discoverability, and ease of integration Define front end standards prioritizing web platform capabilities, progressive enhancement, and accessibility (WCAG) Create governance ...

Tailwind CSS to deliver end-to-end features. Data Architecture: Deep experience with diverse data stores, specifically PostgreSQL , ElasticSearch , and NoSQL (MongoDB), including schema design and performance tuning. System Design: Expert knowledge of RESTful API design and complex asynchronous request handling . Technical Leadership: Experience ...

will be a hands-on technical leader who defines direction, raises engineering standards, and delivers measurable product outcomes, all while remaining deeply involved in design and development. This is not a traditional people-management or delivery-management role—here, you will write code, architect solutions, lead complex projects … role is perfect for leaders seeking high-growth, product-driven environments, who are passionate about distributed systems, and who want to directly influence the design of secure, scalable, and resilient infrastructure while cultivating top engineering talent. What You'll Do: Architect and design scalable, resilient, high-performance backend ...

play a key role in shaping Bidwells’ digital transformation! Working closely with our Director of Technology & Innovation and Senior Solutions Architect, you’ll design, build and deploy modern web applications that drive efficiency, enhance client service and enable data‐driven decision making across the business. A key part … modern JavaScript (ES6+). Hands-on experience with Microsoft Azure services (App Service, Functions, Container Apps, SQL Database). Strong understanding of RESTful API design, microservices architecture and enterprise system integrations. Experience working with SQL databases and ORM frameworks. Familiarity with Git and CI/CD pipelines (Azure ...

. You will be responsible for:- Providing expert level technical direction for complex MarTech projects involving AEM, AEP, Adobe Target, and related integrations. Leading design, development, and implementation efforts across multiple platforms. Leading services and direction, providing technical expertise and completing complex development, design, implementation, architecture design … following skills, then LETS TALK! Full stack development background with Java, JavaScript, HTML, CSS, SQL and modern frameworks Familiarity with microservice architecture, API design, and integration patterns Knowledge of AWS services and cloud-based deployment models Strong understanding of CI/CD pipelines (GitHub), OOP/SOLID, Agile ...

GraphQL specialist ready to lead the integration layer of a major HR systems programme? Our client is seeking a Hasura DDN Integration Engineer to design and deliver a centralised integration platform connecting a core HR system with several external services. The project requires expertise in Hasura, GraphQL, and microservices … This is a hands-on contract role, ideally suited to a senior integration engineer with strong experience in Hasura DDN (or Hasura v2), GraphQL API design, and complex system integrations . The Role Working within a multi-vendor delivery environment, the successful candidate will take ownership ...

Senior Developer, Back End, API, .Net SQL, NW London to £80K (office based role) A Senior Back End Developer is required to join this established financial software house based in North London. They work with some of the leading brands in retail and media, offering financial management systems developed … required with expertise in .NET, C#/VB, SQL Server, and SAP Business One integration. The ideal candidate should have strong skills in RESTful API development, database optimization, and Azure DevOps pipeline management. Knowledge of API security, CI/CD automation, and Swagger documentation is recommended. Responsibilities API ...

consulting company focused on building innovative solutions that address clients’ most complex digital transformation needs. Leveraging our holistic portfolio of capabilities in consulting, design, engineering, and operations, we help clients realize their boldest ambitions and build future-ready, sustainable businesses. With over 230,000 employees and business partners across … ever-changing world. Role Summary We are seeking an AI Architect with deep hands-on experience in AI/ML and Generative AI to design and govern end‐to‐end solutions across application, data, and infrastructure layers. The Architect will own reference architectures , lead solution shaping , and ensure responsible ...

What you’ll do: Design, build, and maintain DDI Automations: Develop robust automation solutions for DNS, DHCP, and IP Address Management, ensuring scalability and reliability. Develop dashboards and alerting: Create and maintain dashboards and alerting mechanisms to monitor DDI automation health and performance. Champion engineering best practices: Establish … Kubernetes, Docker). DevOps Mindset: Strong track record in DevOps, including hands-on experience with CI/CD pipelines, automated testing, and observability tools. API & Gateway Experience: Solid understanding of REST API design principles and experience configuring API gateways (such as Kong). Python Development: Advanced ...

autonomy over how things get built. You'll also play a mentorship role - raising the engineering bar across the team as we scale. Responsibilities Design scalable, secure, and fault-tolerant full-stack architectures, ensuring high availability and resilience across Azure-hosted environments Architect robust backend services in Python using … modern frameworks (FastAPI, Pydantic), implementing clean API design, efficient data pipelines, and integration patterns within our Azure ecosystem Establish and enforce best practices for the TypeScript/React frontend, ensuring a highly performant, accessible, and intuitive user experience, including real-time interfaces and interactive data visualisations Lead ...

agile squad, responsible for the end-to-end delivery of scalable web applications. What You’ll Do (Responsibilities) End-to-End Development: Design and develop high-volume, low-latency applications for mission-critical systems. Back-End Excellence: Write clean, maintainable code using Java and the Spring Boot ecosystem. Front … Innovation: Build responsive, user-friendly UI components using React, Angular, or Vue.js . Database Management: Design and optimize schemas for relational ( PostgreSQL/MySQL ) and NoSQL databases. API Design: Build and consume secure RESTful APIs to integrate with internal and third-party services. Collaboration: Participate in code ...

comfortable identifying problems and driving solutions independently. You will take end-to-end ownership of features, contributing across both backend and frontend to design, build, and deliver high-quality product experiences. In this role, you will primarily work on Purchase Warrior, helping to develop and scale the platform … platform used by thousands of businesses across the UK Opportunities for growth as the engineering team and platform continue to expand Key Responsibilities Design, build, and maintain scalable backend services and APIs Develop frontend features to deliver complete product functionality Take end-to-end ownership of features from design ...

will coordinate with the rest of the team working on different layers of the infrastructure. Therefore, a commitment to collaborative problem solving, sophisticated design, and quality product is important. Responsibilities Working in a team of Front-End engineers Writing clear & concise code Working closely with Back-End engineers Participate … architecture design code reviews API design with the Back-End engineers and other team members to establish more functional, cohesive code Create, maintain documentation while implementing the best coding practices standards Hands-on approach Participation in sprint rituals What you’ll need 6+ years experience developing large ...

backend microservices using TypeScript, Node.js, and Express, with MongoDB for persistent storage and Redis for caching, session management, and pub/sub messaging. Design scalable, well-bounded services that support the throughput and reliability demands of a live-service MMO: player accounts, social systems, marketplace, mail, inventory, and platform … orchestration and deployment. Establish deployment practices that support rapid iteration without compromising stability. Make architectural decisions about service boundaries, data models, caching strategies, and API design that balance immediate delivery needs with long-term scalability. Establish monitoring, alerting, and incident response practices using Grafana and Uptime Kuma ...

that integrate development finance datasets (e.g. OECD, IATI, World Bank, IMF, WHO, etc.) into a unified knowledge graph. Scaling the Knowledge Graph, including schema design, data integration, and optimisations. Developing the data quality framework, implementing provenance tracking, quality indicators, coverage metrics, and automated testing so that every data point … Spanner through the Data Commons infrastructure, alongside BigQuery for internal analytical workloads and MySQL for supporting services. Key responsibilities: Data infrastructure and pipelines Design, build, and maintain open-source ETL/ELT pipelines that ingest, clean, transform, and deliver development finance data from multiple sources. Contribute to data modelling ...

APIs, managing infrastructure with Cloudformation, and building modern user interfaces with React. You will work on a high-traffic system that handles billions of API calls, requiring strong attention to scalability, performance, and reliability. Key Responsibilities Design, develop, and maintain microservices and RESTful APIs (Node.js + AWS Lambda … Handle data and queries using relational databases (e.g., PostgreSQL) Collaborate in designing and developing the user interface using React Integrate and monitor AWS services (API Gateway, S3, CloudWatch, RDS, CloudFront, etc.) Ensure testability, code quality, and DevOps best practices Technical Requirements Minimum of 5 years of experience in full ...

seeking a Senior Java Developer to join a modern engineering team building high-performance, cloud-native services. You will take ownership of backend design and delivery, mentor engineers, and help elevate engineering standards. A key focus of this role is accelerating team capability with GitHub Copilot —we are looking … genuine enthusiast who uses it daily, understands the newest features, and can coach others to use it safely and effectively. Key Responsibilities Design, build, and optimise microservices and APIs using Java 21 . Drive best practice in code quality, testing, secure coding, and performance tuning. Build and integrate with ...

expertise in Corporate Payments and major payment schemes (SEPA, FPS, CHAPS, SWIFT). Regulatory change experience (PSD2/3, ISO 20022, Open Banking). API design, microservices, integration platforms. Cloud experience (AWS/Azure/GCP), DevOps, CI/CD, Docker/Kubernetes. Knowledge of Java, .NET, Python ...

core stack includes: The Engine: Expert-level C# and .NET Core mastery. Architecture: Deep understanding of SOA (Service Oriented Architecture) and complex Object-Oriented design patterns. System Dynamics: Specialized knowledge of concurrency, asynchrony, and parallelism —essential for real-time transactional processing. Data & Web: High proficiency in SQL Server … API design, and modern front-end fundamentals (HTML/CSS/JS). Reliability: A strict practitioner of TDD (Test Driven Development) and robust CI/CD processes. Desired Innovations Our client is actively modernizing. Exposure to the following is highly valued: Cloud & Orchestration: Azure ecosystems, Docker ...

Onsera's core product platforms, from wearables integration and health data pipelines to member payments and AI workflows. As a player-coach, you'll design and implement full-stack solutions while setting engineering standards and help build and mentor our engineering team as we scale. This role offers … opportunity to shape API-first architectures, lead complex integrations with healthcare partners and SaaS platforms, and transition into engineering leadership as the organization scales. What You'll Do Own technical delivery of multiple Onsera products from design through production and iteration Design and implement full-stack solutions ...

suited to an experienced consultant who enjoys setting technical direction, mentoring engineers, and acting as a trusted technical partner to clients. Responsibilities Lead the design and delivery of full stack JavaScript solutions Set technical direction, standards, and best practices across projects Remain hands-on, contributing to critical areas … Required Experience Extensive commercial experience with JavaScript/TypeScript Strong front-end experience with React (or equivalent) Strong back-end experience with Node.js and API design Proven experience in a Lead/Tech Lead/Senior Consultant role Experience designing and delivering scalable systems Strong stakeholder management ...

Software Engineer | Remote | Django | SaaS 📍 UK Remote (Quarterly team meet-ups) 💰 £60,000–£70,000 (DOE) Tech Stack: Python - Django Authentication methods - OAuth2, JWT, API keys AWS SR2 are partnering with a growing SaaS platform used by organisations across global markets. They are looking for a Senior Software Engineer … with strong API integration experience to help expand and scale their platform. This is a backend-focused role where you will design and build integrations that connect the platform with a wide range of external systems, while helping evolve both their public API and internal integration framework. ...

ambiguity and proposing simple, robust solutions Contributing to architectural documentation and decision records Tech Stack & Experience Core technologies: .NET 10/ASP.NET Core Web API Entity Framework Core with Azure SQL .NET MAUI (iOS & Android) - offline-first design Angular 21 (strict TypeScript) DevExpress DevExtreme (v25) Microsoft Azure … experience with modern Angular (v15+) Hands-on Azure architecture and deployment experience Experience implementing Infrastructure as Code Experience integrating Azure Entra ID Strong REST API design knowledge Experience implementing CI/CD pipelines Security-first mindset with strong attention to detail Ability to work independently within defined architectural ...

ambiguity and proposing simple, robust solutions Contributing to architectural documentation and decision records Tech Stack & Experience Core technologies: .NET 10/ASP.NET Core Web API Entity Framework Core with Azure SQL .NET MAUI (iOS & Android) - offline-first design Angular 21 (strict TypeScript) DevExpress DevExtreme (v25) Microsoft Azure … experience with modern Angular (v15+) Hands-on Azure architecture and deployment experience Experience implementing Infrastructure as Code Experience integrating Azure Entra ID Strong REST API design knowledge Experience implementing CI/CD pipelines Security-first mindset with strong attention to detail Ability to work independently within defined architectural ...

ambiguity and proposing simple, robust solutions Contributing to architectural documentation and decision records Tech Stack & Experience Core technologies: .NET 10/ASP.NET Core Web API Entity Framework Core with Azure SQL .NET MAUI (iOS & Android) - offline-first design Angular 21 (strict TypeScript) DevExpress DevExtreme (v25) Microsoft Azure … experience with modern Angular (v15+) Hands-on Azure architecture and deployment experience Experience implementing Infrastructure as Code Experience integrating Azure Entra ID Strong REST API design knowledge Experience implementing CI/CD pipelines Security-first mindset with strong attention to detail Ability to work independently within defined architectural ...