26 to 50 of 180 API Design Jobs in the UK

Technology Team committed to delivering strategic technology decisions, innovative solution designs, and maintaining architecture information across the organisation. Our architecture team plays a crucial role in the assurance and design of key products, working collaboratively with multiple squads responsible for product development and liaising with key business stakeholders to ensure designs meet their needs. We are seeking a Solutions … This role involves shaping the strategic direction for easyJet Holidays' customer technology architecture and documenting our customer technology landscape. You will also participate in our Architecture Guild, which aligns design decisions with technology patterns, standards, and the wider enterprise technology strategy. What you'll be doing: As a Solutions Architect, you will lead the technology strategy for end-to … Customer team in technology discovery for new business ideas, providing conceptual solutions, options analysis, and guidance to realise our customer vision. Your role includes producing high-quality, comprehensive solution design artefacts that demonstrate a balance of different functional and non-functional drivers and requirements. You will provide architectural guidance to product teams and third-party vendors to ensure the More ❯

Technology Team committed to delivering strategic technology decisions, innovative solution designs, and maintaining architecture information across the organisation. Our architecture team plays a crucial role in the assurance and design of key products, working collaboratively with multiple squads responsible for product development and liaising with key business stakeholders to ensure designs meet their needs. We are seeking a Solutions … This role involves shaping the strategic direction for easyJet Holidays' customer technology architecture and documenting our customer technology landscape. You will also participate in our Architecture Guild, which aligns design decisions with technology patterns, standards, and the wider enterprise technology strategy. What you'll be doing: As a Solutions Architect, you will lead the technology strategy for end-to … Customer team in technology discovery for new business ideas, providing conceptual solutions, options analysis, and guidance to realise our customer vision. Your role includes producing high-quality, comprehensive solution design artefacts that demonstrate a balance of different functional and non-functional drivers and requirements. You will provide architectural guidance to product teams and third-party vendors to ensure the More ❯

is a dynamic group of practical and pragmatic architects responsible for making strategic technology decisions, designing solutions, and safeguarding architecture information across the organisation. We ensure the assurance and design of key products being developed, collaborating with multiple squads and liaising with key business stakeholders to meet their needs effectively. We are seeking a Solutions Architect specialised in the … Product teams in technology discovery for new business ideas, providing conceptual solutions, options analysis, and guidance to realise our customer vision. Your responsibilities include producing high-quality, comprehensive solution design artefacts that balance different functional and non-functional drivers and requirements. You will provide architectural guidance to product teams and third-party vendors to ensure the delivered solution realises … Product Inventory Management Platforms, Order Management Platforms, and Caching & Search Solutions. Experience with AWS solution architecture components, building internal and external third-party integration architectures, and Event Driven Architecture Design & API Design is essential. A practical understanding of Generative and Agentic AI technology, a background in software development, and experience in the travel, retail, or e-commerce More ❯

is a dynamic group of practical and pragmatic architects responsible for making strategic technology decisions, designing solutions, and safeguarding architecture information across the organisation. We ensure the assurance and design of key products being developed, collaborating with multiple squads and liaising with key business stakeholders to meet their needs effectively. We are seeking a Solutions Architect specialised in the … Product teams in technology discovery for new business ideas, providing conceptual solutions, options analysis, and guidance to realise our customer vision. Your responsibilities include producing high-quality, comprehensive solution design artefacts that balance different functional and non-functional drivers and requirements. You will provide architectural guidance to product teams and third-party vendors to ensure the delivered solution realises … Product Inventory Management Platforms, Order Management Platforms, and Caching & Search Solutions. Experience with AWS solution architecture components, building internal and external third-party integration architectures, and Event Driven Architecture Design & API Design is essential. A practical understanding of Generative and Agentic AI technology, a background in software development, and experience in the travel, retail, or e-commerce More ❯

Requirements: 4 - 8 years of commercial experience designing and developing applications both individually and as part of a team. Proven experience of working within commodities trading or financial services. Design, develop, enhance, and maintain applications using agreed coding standards and quality targets. Liaise with immediate scrum team, other scrum/project teams, line manager and development lead to ensure … complete delivery. Required Skills: C# and .NET6+ Rest APIs incorporated with SQL Server or Sybase DB Angular 13+ with Dev Extreme UI library desirable, Typescript, HTML5, CSS3 Playwright, Ready API, and Spec flow. Restful API Design and development fundamentals. Modern UI design principles. i.e. Able to take initial design direction and interpret those guidelines to … finalise the design through to a solution. Good SQL knowledge. Functional and functional-reactive programming in Typescript. If this sounds like an interesting opportunity please feel free to apply or reach me at More ❯

sectors. Key Responsibilities: Full stack developer with around 8-10 years development experience, working in a agile development team to deliver robust enterprise-wide solutions utilising industry standard practices Design, develop, enhance and maintain applications using agreed coding standards and quality targets. Ensure quality via code reviews and thorough unit testing. Liaise with immediate scrum team, other scrum/… Experience and expertise with the following technical stack Angular 13+ with DevExtreme UI library desirable Playwright, ReadyAPI and Specflow. Jira, Github, Confluenc Nice to have - C# and .NET6+ Rest API's and Microservice architecture SQL Server Database, NHibernate or Entity Framework Demonstrate expertise of: Building modern-web applications Modern UI design principles. i.e. Able to take initial design direction and interpret those guidelines to finalise the design through to a solution Restful API Design and development fundamentals Good SQL knowledge Test case preparation and execution EDUCATION & EXPERIENCE REQUIREMENTS 8-10 years' experience designing and developing applications both individually and as part of a team Familiarity with energy or financial trading environment Strong inter-personal More ❯

these software platforms offer a comprehensive set of business capabilities across eCommerce, customer relationship management, quoting, product catalogue, orchestration, service assurance, and IDAM. Your focus will be on developing API-driven integrations for the new IT, supported by Microservices, to underpin core integration capabilities. This involves building a standardised set of integration capabilities across the value and volume IT … will be key to understanding and interpreting priorities, working with value stream product owners to prioritise their demands into your backlogs. You will be the subject matter expert for API and Microservices-driven integration work. Responsibilities Technical Solutions : Create and implement technical solutions for a domain or cross-domains/portfolios of work within a specific technology area autonomously … a technical solution within a specific domain or cross-domain. Quality Assurance : Provide technical quality assurance over the work of other engineers through a matrix team structure. Integration Capabilities : Design and deliver strategic integration capabilities using Microservices and TMF open APIs where appropriate, or BT-defined open APIs as part of the Enterprise services/Integration squad. Software Engineering More ❯

technology-driven organisation looking for an experienced Senior Full-Stack Engineer with strong skills across both frontend and backend development. This is a high-impact role where you’ll design and build modern, secure, and scalable web applications using React (with TypeScript), Node.js/.NET Core, and cloud-native technologies on Azure. You will contribute to every stage of … 37.5 hrs/week). TOIL or overtime may apply Clearance: Must be eligible and willing to undergo DBS, NPPV Level 3, and HMPPS Cat A vetting Key Responsibilities Design, develop, and maintain scalable, secure full-stack applications Build modern, responsive frontend interfaces using React, TypeScript, and Tailwind CSS Develop backend services and APIs using Node.js, Python, or .NET … performance with Azure Monitor, Grafana, and Application Insights Ensure secure authentication and access control using OAuth2, RBAC, and Azure IAM Participate in Agile processes, code reviews, mentoring, and solution design Candidate Profile Essential: 5+ years of full-stack development experience with modern web technologies Strong knowledge of JavaScript/TypeScript and modern frontend frameworks (e.g., React) Backend development experience More ❯

challenge of doing more with less. Full Ownership : Take end-to-end ownership of internal platforms, from conception through deployment and ongoing optimization. Core Responsibilities Technical Integration & Platform Development Design and implement robust API integrations between Intercom, internal systems, and third-party platforms Build and maintain our internal web-based admin tools and dashboards Develop scalable, maintainable full … tools that measure system performance and effectiveness Create analytics features that help identify patterns and opportunities for improvement Build data visualization components that make insights accessible to business stakeholders Design and maintain database schemas that support efficient querying and reporting Cross-Functional Engineering Collaboration Reporting directly to the Head of Customer Support to translate business requirements into technical solutions … automation Resolution Impact : Technical contribution to reducing customer issue resolution time What You'll Bring Essential Requirements Full-stack development experience with proven ability to ship production applications Strong API development expertise including REST, GraphQL, and third-party integrations Proficiency in JavaScript, HTML, and CSS with modern framework experience Database design and implementation experience (SQL and NoSQL) Experience More ❯

are committed to maintaining an inclusive, and supportive place for you to do your very best work. We're looking for a Principal Software Engineer to lead the architecture, design, and evolution of our secure, distributed, cloud-native systems. This is a hands-on leadership role where you'll shape engineering strategy while designing and delivering scalable platforms across … example, and helping teams achieve engineering excellence in complex, high-assurance environments. Key Responsibilities Lead the architecture and delivery of secure, scalable microservices in a multi-cloud, containerized environment Design and implement solutions using Java/Kotlin, Spring Boot, Kafka, and other cloud-native tools Champion Domain-Driven Design (DDD), clean architecture, and event-driven paradigms Guide engineers … through code reviews, design sessions, and architecture governance Mentor team members and maintain a culture of technical excellence, continuous learning, and collaborative delivery Define and uphold engineering best practices, including documentation, testing, observability, and CI/CD integration Collaborate with Product, DevOps, and Security teams to translate business needs into reliable technical solutions Drive infrastructure automation and deployment consistency More ❯

up—within a startup-style venture backed by the strength and stability of an established business. Key Responsibilities End-to-end development of high-quality, scalable SaaS platforms from design through deployment and maintenance. Architect and implement robust backend services primarily using Python and PostgreSQL. Develop and maintain responsive, performant front-end applications with TypeScript and modern frameworks (e.g. … development productivity and platform capabilities. Provide technical mentorship and leadership to development teams, fostering best practices in coding, testing, and deployment. Participate in code reviews, architecture discussions, and system design decisions. Troubleshoot and resolve complex technical issues across the full stack. Ensure software security, scalability, and performance are maintained at all times. Keep abreast of emerging technologies and industry … Proven expertise in full-stack development using: TypeScript (and JavaScript frameworks such as NextJS, Node, or Tailwind) Python (including frameworks like Django, Flask, or FastAPI) PostgreSQL and relational database design, optimization, and maintenance. AI Development Tools such as Windsurf, Aider or Augment. Demonstrable experience building and scaling SaaS platforms in a production environment. Strong understanding and practical application of More ❯

up-within a startup-style venture backed by the strength and stability of an established business. Key Responsibilities End-to-end development of high-quality, scalable SaaS platforms from design through deployment and maintenance. Architect and implement robust backend services primarily using Python and PostgreSQL. Develop and maintain responsive, performant front-end applications with TypeScript and modern frameworks (e.g. … development productivity and platform capabilities. Provide technical mentorship and leadership to development teams, fostering best practices in coding, testing, and deployment. Participate in code reviews, architecture discussions, and system design decisions. Troubleshoot and resolve complex technical issues across the full stack. Ensure software security, scalability, and performance are maintained at all times. Keep abreast of emerging technologies and industry … Proven expertise in full-stack development using: TypeScript (and JavaScript frameworks such as NextJS, Node, or Tailwind) Python (including frameworks like Django, Flask, or FastAPI) PostgreSQL and relational database design, optimization, and maintenance. AI Development Tools such as Windsurf, Aider or Augment. Demonstrable experience building and scaling SaaS platforms in a production environment. Strong understanding and practical application of More ❯

for complex energy systems and market modelling. Key Responsibilities Contribute to the development and evolution of their analytical capability, working alongside a highly skilled team of energy market experts. Design, build and maintain robust database infrastructure to optimise internal data workflows and enable scalable access to data to consultants and to our in-house modelling software. Develop and maintain … computational infrastructure, including cloud-based solutions, to enable efficient and scalable stochastic modelling of power systems and energy assets across European and global markets. Lead the design and improvement of UI/UX components of our internal modelling tools, ensuring ease of use, accessibility, and scalability across the company. Collaborate closely with our power and gas/LNG consulting … Cloud computing & DevOps: e.g. AWS (EC2, Lambda, S3), Docker, CI/CD, serverless architecture Frontend development: JavaScript/TypeScript, React, Dash, or similar frameworks Backend APIs: FastAPI, Flask, RESTful API design UI/UX design for data tools (e.g. streamlining internal workflows and dashboards) Experience with energy systems modelling/optimisation, quantitative risk modelling, or stochastic simulation More ❯

for complex energy systems and market modelling. Key Responsibilities Contribute to the development and evolution of their analytical capability, working alongside a highly skilled team of energy market experts. Design, build and maintain robust database infrastructure to optimise internal data workflows and enable scalable access to data to consultants and to our in-house modelling software. Develop and maintain … computational infrastructure, including cloud-based solutions, to enable efficient and scalable stochastic modelling of power systems and energy assets across European and global markets. Lead the design and improvement of UI/UX components of our internal modelling tools, ensuring ease of use, accessibility, and scalability across the company. Collaborate closely with our power and gas/LNG consulting … Cloud computing & DevOps: e.g. AWS (EC2, Lambda, S3), Docker, CI/CD, serverless architecture Frontend development: JavaScript/TypeScript, React, Dash, or similar frameworks Backend APIs: FastAPI, Flask, RESTful API design UI/UX design for data tools (e.g. streamlining internal workflows and dashboards) Experience with energy systems modelling/optimisation, quantitative risk modelling, or stochastic simulation More ❯

Role Title: Senior Consultant Work Mode: FULLY REMOTE Contract duration: 6 Months Location: UK REQUIRED SKILLS: Minimum 8 years of development, design experience with multiple industries At least 5 years of solution design, covering technical integration Experience on API Design First approach, knowledge on API Blueprint/OpenAPI specifications Hands on experience in Oracle SOA …/SQL Following best practices while implementation and giving a confidence to the customer with quality deliverables Performing code review activities Proposing new solutions through PoCs Experience on any API management platform. Experience and knowledge on REST, SOAP, JSON, XML, XSD Knowledge on DevOps methodologies and tooling - Monitoring/ELK, APM , collaboration, ALM, dashboard etc. Knowledge on WebLogic application … in effective manner Strong analytical, logical skills and team leading skills Good understanding of project domain Ability to translate functional/non-functional requirements to systems requirements Ability to design and code complex programs Good understanding of SDLC is a pre-requisite Experience on Agile methodology Strong desire to explore, evaluate and understand new technologies Logical thinking and problem More ❯

Working Hours: 8 per day/40 per week Role Overview: Work directly with subject matter experts, Product owners. designers, technical leads and other architects to re-architect/design needs of next generation Gas and Power trading platform with modern technologies, consistent with business and technology strategies. Deep knowledge of energy trading and risk management processes across front … back-office functionalities with an emphasis on physical trading. What you will do: Expert in designing the architecture of modern, bespoke Energy trading systems, including documenting and agreeing key design decisions and trade-offs across diverse stakeholders. Perform requirement gathering, analysis and design across functional, non-functional technical, and operational domains. Thought leader in respective domain, will be … the key advisor to delivery and design reviews. Handling business changes and managing stakeholder expectations Manage communication across multiple teams, vendors, and consulting staff Knowledge of deal lifecycle What you will have: Strong functional understanding of physical trading preferably Gas and/or Power, ideally including complex contract optionality and portfolio and schedule optimization, Knowledge of Options modelling and More ❯

possibility of extension Working hours: 40 hrs/week Role Overview Work directly with subject matter experts, Product owners. designers, technical leads and other architects to re-architect/design needs of next Gas and Power trading platform with modern technologies, consistent with business and technology strategies. Deep knowledge of energy trading and risk management processes across front, middle … and back-office functionalities with an emphasis on physical trading. 1) Expert in designing the architecture of modern, bespoke Energy trading systems, including documenting and agreeing key design decisions and trade-offs across diverse stakeholders. 2) Perform requirement gathering, analysis and design across functional, non-functional technical, and operational domains. 3) Thought leader in respective domain, will be … the key advisor to delivery and design reviews. 4) Handling business changes and managing stakeholder expectations 5) Manage communication across multiple teams, vendors, and consulting staff 6) Knowledge of deal lifecycle Qualifications Numerate degree Key Skills 1) Strong functional understanding of physical trading preferably Gas and/or Power, ideally including complex contract optionality and portfolio and schedule optimization More ❯

testing Good experience within the AWS ecosystem including, ECS, RDS, Lambda, SQS and Streaming services Familiarity with Terraform and/or other IaaS models Good understanding of OOP principles, design patterns, API design and event-driven architecture Strong experience in modern development practices, such as agile, lean and continuous delivery Perks that spark joy: Access for you More ❯

platform is built for scale, reliability, and agility — and we're looking for a Senior .NET Developer who shares our drive to deliver engineering excellence. What You'll Do Design and implement high-performance, scalablemicroservicesusing.NET 6+ and C# Own features end-to-end: from concept, design, architecture, to deployment in production Collaborate with cross-functional teams on system … architecture, design reviews, and best practices ChampionSOLID, clean code, anddomain-driven design (DDD),etc. Work withAzure services, CI/CD pipelines, and containerised environments (Docker, Kubernetes) Help mentor and guide developers, contributing to a culture of technical excellence What You Bring 5+ years of hands-on experience in modern .NET (Core/6/7+) Deep understanding ofmicroservices … architectureand RESTful API design Strong grasp ofobject-oriented principles, SOLID, and clean architecture patterns Experience withcloud platforms(ideally Azure) Proficient in SQL and/or NoSQL databases, caching strategies, and performance tuning Passion for best practices: TDD, CI/CD, code reviews, and documentation A team-first mindset and the ability to lead small teams More ❯

AWS, Azure, GCP) Proficiency in front end e.g., React, Angular, Vue.js and frameworks such as e.g., Node.js or FastAPI. Experience with databases such as MongoDB and MySQL. Familiarity with API design and development, including serverless technologies, e.g. AWS ECS/API Gateway/Lambda. A passion for space technology and a genuine interest in the space sector More ❯

AWS, Azure, GCP) Proficiency in front end e.g., React, Angular, Vue.js and frameworks such as e.g., Node.js or FastAPI. Experience with databases such as MongoDB and MySQL. Familiarity with API design and development, including serverless technologies, e.g. AWS ECS/API Gateway/Lambda. A passion for space technology and a genuine interest in the space sector More ❯

to connect with great developers ready to grow with us Location: Soho, London (onsite 4 days a week) Salary: Approx. £50.000 annually, depending on experience Main responsibilities Development and Design: Write clean, efficient, and maintainable code using TypeScript, JavaScript, Node.js, and React. Design and implement robust applications and services to meet predefined requirements. Code Review and Quality Assurance … Experience with modern development tools and practices, such as Git, CI/CD pipelines, automated testing frameworks (e.g., Jest, Mocha), and containerisation technologies (e.g., Docker). Knowledge of RESTful API design and development, and familiarity with web services architecture. Ability to write efficient, secure, well-documented, and clean JavaScript code. Familiarity with database technologies, both SQL (e.g., PostgreSQL More ❯

ready to grow with us Location: Soho, London (onsite 4 days a week) Salary: Based on experience Must hold right to work in the UK. Main responsibilities Development and Design: Write clean, efficient, and maintainable code using TypeScript, JavaScript, Node.js, and React. Design and implement robust applications and services to meet predefined requirements. Code Review and Quality Assurance … Experience with modern development tools and practices, such as Git, CI/CD pipelines, automated testing frameworks (e.g., Jest, Mocha), and containerisation technologies (e.g., Docker). Knowledge of RESTful API design and development, and familiarity with web services architecture. Ability to write efficient, secure, well-documented, and clean JavaScript code. Familiarity with database technologies, both SQL (e.g., PostgreSQL More ❯

implementing, and optimizing SaaS applications in a microservices-based environment. As a member of our team, you will contribute to all aspects of the software development lifecycle, including estimation, design, coding, test automation, code reviews, deployment, and support. Teams are responsible for specific services or products. Our solutions help airlines manage safe and high-performance flight operations. Responsibilities: Develop … testing, covering both functional and non-functional aspects Hands-on experience with Python in testing area Applying best practices to keep code maintainable Hands on experience with ASP.NET Web API Experience working with databases and good understanding of Entity Framework Solid understanding of DevOps practices, including CI/CD pipelines (e.g., GitHub Actions, GitLab CI, Jenkins), containerization with Docker … field Proficiency in English spoken and written Nice-to-Haves: Hybrid work environment with up to 2 days working from home weekly Hands-on experience with RESTful/SOAP API design, development, optimization, testing, and security Deep expertise in implementation of automated functional tests using Python Broad and in-depth understanding of software testing concepts and methodologies, including More ❯

implementing, and optimizing SaaS applications in a microservices-based environment. As a member of our team, you will contribute to all aspects of the software development lifecycle, including estimation, design, coding, test automation, code reviews, deployment, and support. Teams are responsible for specific services or products. Our solutions help airlines manage safe and high-performance flight operations. Responsibilities: Develop … testing, covering both functional and non-functional aspects Hands-on experience with Python in testing area Applying best practices to keep code maintainable Hands on experience with ASP.NET Web API Experience working with databases and good understanding of Entity Framework Solid understanding of DevOps practices, including CI/CD pipelines (e.g., GitHub Actions, GitLab CI, Jenkins), containerization with Docker … field Proficiency in English spoken and written Nice-to-Haves: Hybrid work environment with up to 2 days working from home weekly Hands-on experience with RESTful/SOAP API design, development, optimization, testing, and security Deep expertise in implementation of automated functional tests using Python Broad and in-depth understanding of software testing concepts and methodologies, including More ❯