1 to 25 of 143 API Development Jobs in the UK excluding London

Senior Fullstack Developer 50-55k + benefits React, ReactJS, Rest API Development, Node, C#, TypeScript Birmingham - Hybrid Working (1 day/week in-office) Salary: Competitive, dependent on experience, with top-notch employee benefits Join a leading organisation based in Birmingham, West Midlands, offering a fantastic opportunity for a Senior Fullstack Developer with solid experience in RESTful … API development . As a Senior Developer, you will be instrumental in constructing high quality features into their software suite featuring advanced UI functionalities. We seek Fullstack Developers who consider themselves experts in crafting high-quality features for bespoke, world-leading technology organisations. Key Skills for this Fullstack Developer role include: Experience in RESTful API development … Strong expertise in HTML 5, CSS UI Design capabilities Familiarity with AGILE, CI/CD, and DevOps working environments The ideal candidate will possess 5 years plus of commercial development experience in web development, demonstrating a proven ability to deliver highly functional and visually stunning applications and websites. This role offers an excellent career path within a forward More ❯

as a specialist consultant, working on a wide array of complex projects across multiple industries. The Role: We are looking for a Software Engineer with a strong foundation in API development and C# to join our data engineering team in a highly regulated industry. In this role, you’ll be instrumental in designing and building scalable, secure software … strict regulatory standards. We’re seeking candidates with over 5 years of relevant experience, a solid understanding of software system design, and a strong command of C# and modern API development patterns. A background in working with data systems, cloud integrations, and secure, large-scale applications will be highly advantageous. Responsibilities: Design, develop, and maintain scalable APIs and … decisions, and system documentation. Stay current with best practices and emerging technologies in software engineering and data systems. Skills & Experience: You will have the following skills or proven experience: API Development: Proven experience designing and building RESTful APIs and services at scale. Experience with authentication, authorization, and secure API communication (OAuth2, JWT, etc.). Familiarity with API More ❯

solutions that transform digital marketing? Want a better work-life balance with our groundbreaking 4 day week model? We are seeking a Senior Backend Python Developer to support the development of our AI-driven marketing platform, with a strong focus on performance, scalability, and data pipeline architecture. This role is ideal for someone experienced in backend API development … co-founder of SkyScanner. Profits with Purpose - 10% of profits donated to 1moreChild orphanage yearlyMarkets: Marketing & eCommerce Agencies. eCommerce retailers. Your Expertise: Highly experienced Developer with experience of backend API development and working with modern data infrastructure. At ASK BOSCO , part of Modo25, we’re building a smarter, faster, people-first marketing tech business. We're entering a … of key technical decisions, mentor a talented team of developers, and help build a culture of engineering excellence. What You’ll Be Doing: You’ll support the design and development of scalable Python applications that power our AI-driven marketing platform. From architecting robust systems to guiding our technical roadmap, you’ll work cross-functionally to turn strategy into More ❯

solutions that transform digital marketing? Want a better work-life balance with our groundbreaking 4 day week model? We are seeking a Senior Backend Python Developer to support the development of our AI-driven marketing platform, with a strong focus on performance, scalability, and data pipeline architecture. This role is ideal for someone experienced in backend API development … co-founder of SkyScanner. Profits with Purpose - 10% of profits donated to 1moreChild orphanage yearlyMarkets: Marketing & eCommerce Agencies. eCommerce retailers. Your Expertise: Highly experienced Developer with experience of backend API development and working with modern data infrastructure. At ASK BOSCO , part of Modo25, we’re building a smarter, faster, people-first marketing tech business. We're entering a … of key technical decisions, mentor a talented team of developers, and help build a culture of engineering excellence. What You’ll Be Doing: You’ll support the design and development of scalable Python applications that power our AI-driven marketing platform. From architecting robust systems to guiding our technical roadmap, you’ll work cross-functionally to turn strategy into More ❯

solutions that transform digital marketing? Want a better work-life balance with our groundbreaking 4 day week model? We are seeking a Senior Backend Python Developer to support the development of our AI-driven marketing platform, with a strong focus on performance, scalability, and data pipeline architecture. This role is ideal for someone experienced in backend API development … co-founder of SkyScanner. Profits with Purpose - 10% of profits donated to 1moreChild orphanage yearlyMarkets: Marketing & eCommerce Agencies. eCommerce retailers. Your Expertise: Highly experienced Developer with experience of backend API development and working with modern data infrastructure. At ASK BOSCO , part of Modo25, we’re building a smarter, faster, people-first marketing tech business. We're entering a … of key technical decisions, mentor a talented team of developers, and help build a culture of engineering excellence. What You’ll Be Doing: You’ll support the design and development of scalable Python applications that power our AI-driven marketing platform. From architecting robust systems to guiding our technical roadmap, you’ll work cross-functionally to turn strategy into More ❯

solutions that transform digital marketing? Want a better work-life balance with our groundbreaking 4 day week model? We are seeking a Senior Backend Python Developer to support the development of our AI-driven marketing platform, with a strong focus on performance, scalability, and data pipeline architecture. This role is ideal for someone experienced in backend API development … founder of SkyScanner. Profits with Purpose - 10% of profits donated to 1moreChild orphanage yearly Markets: Marketing & eCommerce Agencies. eCommerce retailers. Your Expertise: Highly experienced Developer with experience of backend API development and working with modern data infrastructure. At ASK BOSCO® , part of Modo25, we’re building a smarter, faster, people-first marketing tech business. We're entering a … of key technical decisions, mentor a talented team of developers, and help build a culture of engineering excellence. What You’ll Be Doing: You’ll support the design and development of scalable Python applications that power our AI-driven marketing platform. From architecting robust systems to guiding our technical roadmap, you’ll work cross-functionally to turn strategy into More ❯

SoftwareDeveloper(API Development/Backend Node.js, C#, Fullstack) Birmingham, West Midlands (Hybrid 1 day onsite a week) 55k + Benefits Were partnering with a leading enterprise software house in Birmingham that is expanding its engineering team. Theyre looking for a Software Engineer with strong API and backend development experience to work on complex, high-performing systems … CD. Optimise performance, security, and maintainability of backend services. Support occasional front-end integration using React (desirable, not essential). Skills & Experience 4+ years commercial experience in backend/API development. Strong expertise in Node.js and C#. Solid understanding of REST API design and implementation. Experience with cloud computing and CI/CD pipelines. Knowledge of automated testing … a forward-thinking Software engineering team based in Birmingham, focused on quality and innovation, where you will work on high-impact enterprise software projects. Keywords : Software Developer, Backend Developer, API development, Rest Api, Node.js, C#.React, Fullstack, Birmingham, West Midlands To apply, please send your CV to Bethany at or call 0161 438 1177 for more details. Follow More ❯

be responsible for designing, developing, and maintaining robust, scalable, and secure server-side solutions for PRA’s web, mobile and CRM applications. You will play a key role in API development and integration, supporting key platforms and product channels, and collaborating with cross-functional teams to deliver high-quality digital products. Main Duties and Responsibilities Back-End Development … readiness and compliance. Collaboration & Agile Delivery Work closely with Product Owners, Business Analysts, Developers, and Testers to deliver integrated features. Participate in sprint ceremonies, technical reviews, and cross-functional development teams. Contribute to BAU transition planning and documentation for mobile and web platforms. Continuous Improvement Stay abreast of best practices, modern technologies, and technical approaches to back-end and … backlog and DevOps readiness. Participate in environment setup and device matrix testing for mobile app back-end support. Experience and Qualifications 3+ years of professional experience in back-end development (C#, .NET, API development). Experience supporting mobile app back-end (API integration, secure data handling, payments, authentication). Solid understanding of OOP, design principles, and More ❯

C# Developer - .NetCore, C# C# .NET Developer to write clean reliable code. Core Web API development needed for an excellent, fast paced, innovative tech driven client. Working on real-time payment software you will be working on exciting tech electric vehicle software and joining a small professional, highly talented SW dev team. Expertise in C# .NET. It would … microservices, DevOps working in a clopud AWS environment with exposure to Kubernetes, CI/CD, Containerisation, pipelines, deployment. Writing functioning code, crafting solutions, with the following tech stack: C# development .NET Core Web API development ORM - Linq2DB, Entity framework Core .Net5 Docker, CI/CD Git Agile Coding and programming in C# and .NetCore, .Net5+ developing new … existing systems which are web, microservices. You will be involved writing Nuget packages, developing unit and integration tests, performing code reviews, and debugging systems! Working in an Agile software development environment, working with CI/CD pipeline tech, ORM Technologies, Docker composer, Kubernetes, and cloud AWS/Azure. This an excellent opportunity for someone who has a drive for More ❯

edge AI and data-driven applications. Be part of an innovative and collaborative new team. Gain continuous learning and career growth opportunities. Competitive compensation and benefits package. AI & Software Development Design, develop, and maintain AI-powered applications using .NET, C#, Python, and Azure cloud technologies. Build scalable, maintainable, and high-performance AI solutions for enterprise integration. AI Solution Integration … Integrate AI services and frameworks to enhance applications with automation, analytics, and advanced decision-making. Develop smart applications using Azure Open AI, Cognitive Services, and AI-driven APIs. API Development & Cloud Solutions Develop secure, efficient, and scalable RESTful APIs for AI and enterprise applications. Deploy and manage AI/data solutions using Azure Open AI, Azure Kubernetes Service … the following skills and experience: Strong communication and problem-solving skills. Proficiency in C#, .NET, or Python for AI-driven solutions and automation. Experience in AI solution integration and API development (REST, GraphQL). Hands-on experience with Azure cloud services, including Azure OpenAI, AKS, and Azure Container Apps. Strong knowledge of SQL and NoSQL databases (Azure Cosmos More ❯

. You'll be instrumental in designing, developing, and maintaining the backend services that manage multiple payment gateways, methods, and related functions. Your expertise in TypeScript/Node.js , backend development, and database integration is crucial for building efficient and secure payment processes. What You'll Be Doing (Key Responsibilities) Backend Development: Play a key role in developing robust … server-side applications and core payment flows. API Development: Design and optimize high-performing APIs. Database Management: Assist in designing and optimizing database schemas (relational and NoSQL). Code Quality: Execute thorough tests to ensure code quality, reliability, and security. Scalability & Performance: Contribute to designing scalable infrastructure and optimizing performance. Collaboration: Work closely with cross-functional teams, providing … technical input and assisting with frontend development (UX best practices). Support: Be on standby to promptly troubleshoot and resolve system-related issues with agility. Continuous Improvement: Engage in continuous learning, skill improvement, and project documentation. What You'll Bring (Required Skills) Proficiency in JavaScript/TypeScript and strong scripting/coding ability, particularly with Node.js . Experience with More ❯

and detail-oriented Junior IT Analyst to support our IT operations, data reporting, and infrastructure. This entry-level role is ideal for candidates with foundational knowledge in IT systems, API development, and data visualization using Power BI. Key Responsibilities: Provide first-level technical support to end-users via phone, email, or in person. Troubleshoot hardware, software, connectivity issues … related to Microsoft Dynamics NAV and/or Business Central, escalating complex problems as needed. Document technical issues, resolutions, and system changes in the helpdesk system. Assist in the development and testing of basic APIs for internal system integrations. Create and maintain Power BI dashboards and reports to support business decision-making. Support onboarding processes including setting up user … IT support or analyst role. Familiarity with Windows operating systems, Microsoft Dynamics NAV and/or Business Central. Experience with Power BI for data visualization and reporting. Exposure to API development using tools or languages such as Postman, Python, or JavaScript. Strong Excel and Microsoft Office Suite skills. Strong problem-solving and communication skills. Ability to review processes More ❯

Join our product team in the Cardiff office, we are looking for someone with extensive API working experience. You are expected, if successful, to work 50% of the week in the office. To be eligible to work our Hybrid working pattern you must be living within a 35 mile radius of the office. WHO ARE WE? Privately owned and … need to make important prioritization decisions to meet current and future customer needs (including fit-for-use for LLMs). Key to the role will be working with the API Architect and development team to ensure we are building the right thing at the right time. You will work closely with engineering, product, marketing, sales and support teams … and customers across the globe to ensure smooth product development, go-to-market and day-to-day customer experience. KEY DUTIES AND RESPONSIBILITIES Champion the customer perspective, gathering feedback to inform API product decisions. Own and prioritize the product roadmap to maximize business value and reduce delivery friction. Partner with the API Architect to provide a clear More ❯

Overview About Certara is a growing company that provides a dynamic and exciting place to work. Our purpose is to assist in accelerating the development of meaningful medicines that make an impact on our society and the people that need them most. Innovation and creativity are highly valued, and everyone is given the opportunity for training and continuous development. … Our portfolio spans the discovery, preclinical, clinical and post marketing phases of drug development, working with 1,200 commercial companies, 250 academic institutions, and numerous regulatory agencies. As a Senior Software Developer at Certara, you will lead the design, development, and optimization of cloud native, scalable, web applications, APIs and services. Collaborating with developers, IT, DevOps, and science … and customer needs in a dynamic, forward thinking environment. This role is remote in the UK, but occasional attendance in the Sheffield office is required. Responsibilities Lead the design, development, testing, and deployment of cloud native scalable, high performance solutions and platforms, including web applications, APIs, services, databases, event busses and other infrastructure. Provide collaborative expertise and consultancy on More ❯

Mid Level & Senior .NET Developer (Azure/API Experience) Location: Hybrid Type: Full-time, Permanent Industry: Software Development About Us My client is an award-winning software development company specialising in innovative cloud-based solutions designed for accountants . Their mission is to simplify financial management through scalable software products that help professionals to focus on what … they do best. As they continue to grow, we're looking for both Mid level & Senior .NET Developer's with strong Azure and API development experience to join our talented, collaborative engineering team. The Role You’ll play a key role in the design, development, and delivery of high-quality software solutions that support thousands of accounting … professionals nationwide. Working closely with our product managers, architects, and QA specialists, you’ll help shape our technology roadmap and contribute to the continuous improvement of our development practices. This is a hybrid position , with flexibility to work remotely and occasional on-site collaboration (1–2 times per month) at our Warwick office. Key Responsibilities Design, develop, and maintain More ❯

you’ll be part of a well-established, collaborative team building a feature-rich platform that’s evolving rapidly as the EV market matures. You’ll contribute to the development and maintenance of a wide range of features using modern .NET technologies, helping shape the future of sustainable transport. We’re seeking someone who writes clean, reliable code, enjoys … solving real-world business problems, and thrives in a global team of skilled professionals. You’ll be encouraged to stay current with emerging technologies, adopt modern development practices, and actively participate in planning, architecture discussions, and code reviews. This role reports to the Team Lead and offers flexibility with either full-time office-based work or a hybrid model … and managing internal NuGet packages Writing robust unit and integration tests Participating in peer code reviews Diagnosing and resolving system issues Qualifications 2–4 years’ commercial experience in C# development Solid understanding of .NET Core and Web API development Experience working in Agile software development teams Familiarity with relational databases and basic knowledge of key-value More ❯

as React, Angular, or Vue.js. Collaborate with architects and other developers to design robust, scalable, and secure architectures for new projects and enhancements to existing systems. Participate in agile development processes, including sprint planning, daily stand-ups, and retrospectives. Conduct thorough code reviews to ensure code quality, performance, and adherence to best practices. Contribute to improving our teams’ development … expectations. Stay up to date with the latest industry trends and technologies, and drive continuous learning and innovation within the team. Preferred Experience Proven experience in full stack JavaScript development, with a strong focus on Node.js and server-side development. Experience of at least one leading Node framework (Express.js, Nest.js, Hapi.js) Expertise in at least one modern front-end … framework (Nest.js, Remix.js). Proficiency in HTML5, CSS3, and JavaScript (ES6+). Experience with TypeScript and modern development tools and practices. Experience of Test Driven or Behaviour Driven Development. Knowledge of (Cloud-Native) development and serverless architectures (AWS, Azure, Google Cloud). Familiarity with CI/CD pipelines and DevOps practices. Experience with version control systems (Git). More ❯

of developers, testers, product managers and architects to build secure, scalable systems and help guide technical direction across your team. You'll also mentor colleagues and contribute to improving development processes and standards across the Software Development Practice. HMLR's Developers work on a variety of projects that are central to their digital transformation. This includes rebuilding core … geospatial data initiatives, developing new cloud-native services and modernising legacy applications into scalable, containerised solutions. If you would like to find out more about the role, The Software Development profession and what it's like to work at HMLR, a Hiring Manager Q&A session where you can virtually 'meet the team' will be held via Teams on … Responsibilities Lead the design, build, and maintenance of complex digital services and APIs Deputise for the Lead Developer, providing technical leadership and mentorship Influence and improve the team's development practices, CI/CD pipelines, and tooling Collaborate with architects and product managers to ensure technical solutions meet user and business needs Take a holistic view of delivery, ensuring More ❯

of developers, testers, product managers and architects to build secure, scalable systems and help guide technical direction across your team. You'll also mentor colleagues and contribute to improving development processes and standards across the Software Development Practice. HMLR's Developers work on a variety of projects that are central to their digital transformation. This includes rebuilding core … geospatial data initiatives, developing new cloud-native services and modernising legacy applications into scalable, containerised solutions. If you would like to find out more about the role, The Software Development profession and what it's like to work at HMLR, a Hiring Manager Q&A session where you can virtually 'meet the team' will be held via Teams on … Responsibilities Lead the design, build, and maintenance of complex digital services and APIs Deputise for the Lead Developer, providing technical leadership and mentorship Influence and improve the team's development practices, CI/CD pipelines, and tooling Collaborate with architects and product managers to ensure technical solutions meet user and business needs Take a holistic view of delivery, ensuring More ❯

of developers, testers, product managers and architects to build secure, scalable systems and help guide technical direction across your team. You'll also mentor colleagues and contribute to improving development processes and standards across the Software Development Practice. HMLR's Developers work on a variety of projects that are central to their digital transformation. This includes rebuilding core … geospatial data initiatives, developing new cloud-native services and modernising legacy applications into scalable, containerised solutions. If you would like to find out more about the role, The Software Development profession and what it's like to work at HMLR, a Hiring Manager Q&A session where you can virtually 'meet the team' will be held via Teams on … Responsibilities Lead the design, build, and maintenance of complex digital services and APIs Deputise for the Lead Developer, providing technical leadership and mentorship Influence and improve the team's development practices, CI/CD pipelines, and tooling Collaborate with architects and product managers to ensure technical solutions meet user and business needs Take a holistic view of delivery, ensuring More ❯

delivery. This is a hands-on leadership role where you’ll combine people management with technical delivery, taking the lead on architecture, coding, and innovation while supporting the professional development of your team. Location: Hybrid – Milton Keynes (2–3 days per week on-site) Salary: £65,000 – £75,000 + benefits + bonus Requirements for Software Engineering Team Leader … from inception to completion while maintaining high technical standards Adaptability to new tools, technologies, and methodologies Solid technical skills in: .NET (C#) Unit & integration testing CI/CD pipeline development (GitHub or similar) AWS services (IAM, Lambda, API Gateway) Angular, REST APIs, Web API development SpecFlow (BDD), Postman, OpenAPI MS SQL Server (SQL) & MongoDB (NoSQL) Docker … Experience with CQRS and Event Bus architecture is highly desirable Responsibilities for Software Engineering Team Leader Lead, mentor, and support a team of engineers, driving both technical and personal development Oversee architectural design and code reviews, ensuring high standards and consistency Plan and deliver work in line with Scaled Agile Framework (SAFe) principles Embed robust quality assurance practices to More ❯

world-class cloud solutions used by clients around the globe. As part of their continued growth, theyre looking for a Fullstack TypeScript Developer to join their cross-functional, agile development team. The Role As a Fullstack Developer, youll play a key role in designing and building intuitive, data-rich, and user-friendly applications. Youll work across the full stack … with a particular focus on Node.js backend development , while also creating high-quality front-end interfaces in React . Core Responsibilities for this Developer role: Develop, maintain, and enhance cloud-based applications and services . Focus on Node.js backend development and RESTful API design. Collaborate with designers, product owners, and fellow developers in an agile environment . … Build and optimise front-end features using React. Apply Test-Driven Development (TDD) principles to deliver reliable, maintainable code. Use Git for version control and Azure DevOps for tracking progress and estimations. Core Skills & Experience 5+ years experience developing commercial software and web applications . Strong proficiency in TypeScript for building data-heavy applications. Skilled in Node.js backend and More ❯

Senior PHP Software Engineer Annual Salary: Competitive Location: Swindon (hybrid) Job Type: Full-time Our client is looking for a PHP Software Engineer to join our in-house development team. This role offers the chance to take ownership of key technical components within our modern software ecosystem, which is crucial for our core business operations and client solutions. Day … to-day of the role: Lead the design and development of new features and modules within our Laravel-based applications. Refactor and optimise existing codebases for performance, scalability, and maintainability. Implement and maintain RESTful APIs and integrations with internal and third-party systems. Write clean, well-documented, and testable code following modern PHP standards. Contribute to architectural planning, sprint … with DevOps and front-end teams to deliver seamless end-to-end solutions. Provide technical guidance and mentoring to other developers. Required Skills & Qualifications: 7+ years of professional PHP development experience, including Laravel. Strong understanding of object-oriented programming, design patterns, and application architecture. Proficiency with MySQL and SQL Server. Hands-on experience with Docker and containerised development More ❯

software ecosystem. You’ll design, develop, and maintain scalable, secure applications while mentoring junior developers and collaborating closely with teams across the business. Key Responsibilities: Lead the design and development of new features and modules within Laravel-based applications. Refactor and optimise existing codebases to enhance performance, scalability, and reliability. Develop and maintain RESTful APIs and integrations with internal … front-end teams to deliver seamless end-to-end solutions. Provide technical leadership and mentoring to other developers. Requirements About You Essential Skills & Experience: 7+ years of professional PHP development experience, including strong knowledge of Laravel. Strong understanding of object-oriented programming, design patterns, and application architecture. Proficiency with MySQL and SQL Server. Hands-on experience with Docker and … containerised development environments. Proven experience in API development and third-party integrations. Strong understanding of testing practices and CI/CD workflows using Git. Excellent problem-solving, debugging, and communication skills. Desirable Skills: Experience deploying applications to AWS or other cloud platforms. Familiarity with microservices or event-driven architectures. Exposure to front-end frameworks such as React More ❯

Senior Software Engineer - Building APIs - RESTful API - AI Services - C# .Net - SQL - Azure We are seeking an experienced Senior API Developer with solid experience in designing and implementing API Infrastructure. This is an opportunity to work on cutting-edge AI infrastructure, make a significant impact on how to leverages AI technology at scale. The role suits a … technically strong Senior Software API Developer who enjoys building new solutions, solving complex integration challenges. Working with autonomy and technical ownership, you'll architect scalable, secure APIs that handle sensitive data while enabling rapid deployment of AI capabilities across the business. As a senior member of the team, you'll set architectural direction, establish API standards, and mentor … other engineers while building production-grade integrations that power real customer value. Key Responsibilities API Architecture & Design Design and implement RESTful APIs that expose the product capabilities to AI services and third-party integrations Architect scalable, secure API infrastructure serving multiple products and consumers Establish API design standards, patterns, and best practices across the engineering organization Design More ❯