1 to 25 of 259 API Development Jobs in the UK

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 ❯

We are looking for Software Engineers 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 systems that support seamless data movement between internal systems, third-party platforms, and cloud services. Your core focus … 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. Core Responsibilities: •Design, develop, and maintain scalable APIs … approach to diagnosing and resolving issues. •Detail-oriented with a mindset geared toward continuous improvement. •Able to prioritize and manage multiple projects simultaneously in a dynamic environment. Technical Skills: • 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 ❯

We are looking for Software Engineers 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 systems that support seamless data movement between internal systems, third-party platforms, and cloud services. Your core focus … 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. Core Responsibilities: •Design, develop, and maintain scalable APIs … approach to diagnosing and resolving issues. •Detail-oriented with a mindset geared toward continuous improvement. •Able to prioritize and manage multiple projects simultaneously in a dynamic environment. Technical Skills: • 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 ❯

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 ❯

for fueling, EV charging, and parking directly from their vehicles. What you will do Maintain and expand our serverless card payment infrastructure built with TypeScript, Node.js, and AWS (Lambda, API Gateway, DynamoDB). Ensure continued PCI DSS compliance. Work with others to fix bugs, implement minimal new features, trace errors, and ensure security patches are applied in production and … resilience. Who are you Strong hands-on experience with TypeScript and Node.js. Frontend familiarity is helpful (e.g. React). Proficiency with AWS services in a serverless context, especially CloudFront, API Gateway, Lambda, DynamoDB and CloudWatch. Commercial experience with Infrastructure-as-Code tools such as Terraform, SST, CDK or CloudFormation. Strong understanding of API development, RESTful design, and … secure authentication. Demonstrated knowledge of API security and OWASP Top 10 vulnerabilities. Experience with Docker, Linux, Git, and container-based environments. Hands-on development experience with PCI DSS, payment systems, or other regulated environments is essential Excellent communicator with a self-starter attitude and comfort working autonomously. Demonstrable expertise and understanding of API development/design More ❯

for fueling, EV charging, and parking directly from their vehicles. What you will do Maintain and expand our serverless card payment infrastructure built with TypeScript, Node.js, and AWS (Lambda, API Gateway, DynamoDB). Ensure continued PCI DSS compliance. Work with others to fix bugs, implement minimal new features, trace errors, and ensure security patches are applied in production and … resilience. Who are you Strong hands-on experience with TypeScript and Node.js. Frontend familiarity is helpful (e.g. React). Proficiency with AWS services in a serverless context, especially CloudFront, API Gateway, Lambda, DynamoDB and CloudWatch. Commercial experience with Infrastructure-as-Code tools such as Terraform, SST, CDK or CloudFormation. Strong understanding of API development, RESTful design, and … secure authentication. Demonstrated knowledge of API security and OWASP Top 10 vulnerabilities. Experience with Docker, Linux, Git, and container-based environments. Hands-on development experience with PCI DSS, payment systems, or other regulated environments is essential Excellent communicator with a self-starter attitude and comfort working autonomously. Demonstrable expertise and understanding of API development/design More ❯

for fueling, EV charging, and parking directly from their vehicles. What you will do Maintain and expand our serverless card payment infrastructure built with TypeScript, Node.js, and AWS (Lambda, API Gateway, DynamoDB). Ensure continued PCI DSS compliance. Work with others to fix bugs, implement minimal new features, trace errors, and ensure security patches are applied in production and … resilience. Who are you Strong hands-on experience with TypeScript and Node.js. Frontend familiarity is helpful (e.g. React). Proficiency with AWS services in a serverless context, especially CloudFront, API Gateway, Lambda, DynamoDB and CloudWatch. Commercial experience with Infrastructure-as-Code tools such as Terraform, SST, CDK or CloudFormation. Strong understanding of API development, RESTful design, and … secure authentication. Demonstrated knowledge of API security and OWASP Top 10 vulnerabilities. Experience with Docker, Linux, Git, and container-based environments. Hands-on development experience with PCI DSS, payment systems, or other regulated environments is essential Excellent communicator with a self-starter attitude and comfort working autonomously. Demonstrable expertise and understanding of API development/design More ❯

Senior C# Developer - .NetCore, API, NuGet, ORM, Linq2DB Talented, Senior C# .NET Developer to work on a feature rich platform. Developing features modern .NET helping shape the future of sustainable transport. Participate in planning, architecture discussions, code reviews to ensure clean reliable code. Core Web API development needed for an excellent, fast paced, innovative tech driven client. … software and joining a small professional, highly talented SW dev team. Expertise in C# .NET. Experience of enhancing web and microservices systems, AWS, creating managnig internal NuGet packages. C# development .NET Core .Net Core Web API development ORM - Linq2DB, Entity framework .Net5 Docker, CI/CD Git Agile Coding and programming in C# and .NetCore, .Net5+ developing … 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 ❯

of engineers dedicated to developing AI-powered search and Retrieval-Augmented Generation (RAG) pipelines within DataStax-based architecture. This role is perfect for someone with expertise in Open-source, API development, fine-tuning LLMs, and integrating AI into scalable applications. If you thrive in an AI-driven development environment, enjoy working on cutting-edge retrieval models, and … specific performance. Optimize embedding models for better semantic search and document retrieval. Integrate AI-driven solutions with vector databases such as DataStax Astra DB, Weaviate, or FAISS. Implement secure API authentication (OAuth2, JWT) and manage access controls. Collaborate with AI/ML, data engineering, and DevOps teams to ensure seamless system integration. Monitor API performance and AI search … efficiency, implementing optimizations where necessary. Stay up to date with advancements in LLM fine-tuning, RAG methodologies, and vector search techniques. Essential Skills & Experience: Programming: Strong proficiency in Opensource. API Development: Experience with FastAPI, Flask (Python) OR Express.js for microservices. RAG Development: Hands-on experience building retrieval-augmented AI search solutions. LLM Fine-Tuning: Experience fine-tuning More ❯

seeking a Full Stack Software Engineer to join our team! We're particularly looking for someone with strong Golang experience and with some experience of TypeScript and React frontend development . If you also have a knack for Kubernetes/containerisation, that's a significant bonus! In this role, you'll be a key contributor to the development … We're excited to have you contribute to our mission! Responsibilities : As a Safe Intelligence Full Stack Software Engineer, you will: Engineering of Golang-based backend systems , focusing on API development and integration. Contribute significantly to software development on our TypeScript-based frontend systems , primarily utilizing React to craft intuitive and highly functional user interfaces. Productize and … dataset management, verification workflows, and result/metric aggregations. Collaborate closely with our scientific and technical teams to interface with and containerize our PyTorch-based verification toolkit. Champion an API-first development approach to deliver feature-rich, versioned interfaces that support both our TypeScript user interface and Python-based SDKs. Develop and maintain Infrastructure as Code (IaC) and More ❯

seeking a Full Stack Software Engineer to join our team! We're particularly looking for someone with strong Golang experience and with some experience of TypeScript and React frontend development . If you also have a knack for Kubernetes/containerisation, that's a significant bonus! In this role, you'll be a key contributor to the development … We're excited to have you contribute to our mission! Responsibilities : As a Safe Intelligence Full Stack Software Engineer, you will: Engineering of Golang-based backend systems , focusing on API development and integration. Contribute significantly to software development on our TypeScript-based frontend systems , primarily utilizing React to craft intuitive and highly functional user interfaces. Productize and … dataset management, verification workflows, and result/metric aggregations. Collaborate closely with our scientific and technical teams to interface with and containerize our PyTorch-based verification toolkit. Champion an API-first development approach to deliver feature-rich, versioned interfaces that support both our TypeScript user interface and Python-based SDKs. Develop and maintain Infrastructure as Code (IaC) and More ❯

shaping the design and delivery of Ofsted's digital services. You will work collaboratively with colleagues and partners across Ofsted and the wider public sector. You will lead the development and enhancement of Ofsted's Common Data Platform Service - a suite of .Net applications hosted in Microsoft Azure, using Rest and GraphQL APIs with SQL Server and CosmosDB databases. … Big Picture Making Effective Decisions Communicating and Influencing Working Together Technical skills We'll assess you against these technical skills during the selection process: Experience of leadership, motivation and development of technical teams. Demonstrable credibility with senior business and technical stakeholders. Ability to explain, persuade and influence. Demonstrable commercial awareness in the context of procurement and supplier management. Experience … and practical knowledge of common cloud platforms, patterns and services, specifically Microsoft Azure. Experience and practical knowledge of .Net (C#) based API development with an understanding of GraphQL as a query language. Knowledge and experience of working with Microsoft Azure SQL Server and/or Cosmos DB. Knowledge and experience of CI/CD Pipelines, Infrastructure as Code More ❯

shaping the design and delivery of Ofsted's digital services. You will work collaboratively with colleagues and partners across Ofsted and the wider public sector. You will lead the development and enhancement of Ofsted's Common Data Platform Service - a suite of .Net applications hosted in Microsoft Azure, using Rest and GraphQL APIs with SQL Server and CosmosDB databases. … Big Picture Making Effective Decisions Communicating and Influencing Working Together Technical skills We'll assess you against these technical skills during the selection process: Experience of leadership, motivation and development of technical teams. Demonstrable credibility with senior business and technical stakeholders. Ability to explain, persuade and influence. Demonstrable commercial awareness in the context of procurement and supplier management. Experience … and practical knowledge of common cloud platforms, patterns and services, specifically Microsoft Azure. Experience and practical knowledge of .Net (C#) based API development with an understanding of GraphQL as a query language. Knowledge and experience of working with Microsoft Azure SQL Server and/or Cosmos DB. Knowledge and experience of CI/CD Pipelines, Infrastructure as Code More ❯

shaping the design and delivery of Ofsted's digital services. You will work collaboratively with colleagues and partners across Ofsted and the wider public sector. You will lead the development and enhancement of Ofsted's Common Data Platform Service - a suite of .Net applications hosted in Microsoft Azure, using Rest and GraphQL APIs with SQL Server and CosmosDB databases. … Big Picture Making Effective Decisions Communicating and Influencing Working Together Technical skills We'll assess you against these technical skills during the selection process: Experience of leadership, motivation and development of technical teams. Demonstrable credibility with senior business and technical stakeholders. Ability to explain, persuade and influence. Demonstrable commercial awareness in the context of procurement and supplier management. Experience … and practical knowledge of common cloud platforms, patterns and services, specifically Microsoft Azure. Experience and practical knowledge of .Net (C#) based API development with an understanding of GraphQL as a query language. Knowledge and experience of working with Microsoft Azure SQL Server and/or Cosmos DB. Knowledge and experience of CI/CD Pipelines, Infrastructure as Code 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 ❯

We are currently seeking an experienced Senior Developer to join our established Client Digital Solutions team responsible for the development, implementation, and maintenance of software solutions across both our UK and NL services sectors and our wider international clients. As an experienced Senior Developer, you will become a key member of a core team developing market leading cloud based … digital solutions to our clients. Your Responsibilities: Develop, deploy, test and support cloud applications. Working as part of a dedicated software development team, under the guidance of technical lead members on all aspects of the software development lifecycle Involvement in the development of new external software solutions. Use Microsoft Azure to develop and deploy software solutions in … acceptance criteria are met. Testing and deploying cloud applications using continuous integration, code quality checks and distribution pipelines. Ensuring non-functional requirements including security considerations are met in the development of the solutions. Supporting existing solutions and assisting in their maintenance and support. Providing additional application troubleshooting and support where necessary. Producing suitable end user/technical documentation and 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 ❯

As a Senior Software Engineer, you will play a pivotal role in architecting and developing our next-generation web application and API. This role requires technical leadership, hands-on development, and mentoring of junior developers. You will drive the adoption of best practices, ensuring scalability, security, and performance. If you are passionate about software development, enjoy solving complex … tangible impact. This role will be eligible for visa sponsorship only for candidates that are already based in the UK. Key Responsibilities Technical Leadership: Lead the technical design and development of scalable, secure web applications and APIs, driving best practices across the development lifecycle. Architecture & Design: Oversee system architecture decisions, ensuring alignment with business goals and scalability requirements. … Mentorship: Mentor and guide junior developers, fostering a collaborative learning environment. API Development: Design and build RESTful API endpoints using NodeJS and Express, including detailed API documentation. Database Management: Design, optimize, and maintain complex SQL data models, ensuring efficient data structures, query performance, and reliability. Full-Stack Development: Develop responsive and performant front-end applications More ❯

As a Senior Software Engineer, you will play a pivotal role in architecting and developing our next-generation web application and API. This role requires technical leadership, hands-on development, and mentoring of junior developers. You will drive the adoption of best practices, ensuring scalability, security, and performance. If you are passionate about software development, enjoy solving complex … tangible impact. This role will be eligible for visa sponsorship only for candidates that are already based in the UK. Key Responsibilities Technical Leadership: Lead the technical design and development of scalable, secure web applications and APIs, driving best practices across the development lifecycle. Architecture & Design: Oversee system architecture decisions, ensuring alignment with business goals and scalability requirements. … Mentorship: Mentor and guide junior developers, fostering a collaborative learning environment. API Development: Design and build RESTful API endpoints using NodeJS and Express, including detailed API documentation. Database Management: Design, optimize, and maintain complex SQL data models, ensuring efficient data structures, query performance, and reliability. Full-Stack Development: Develop responsive and performant front-end applications 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 ❯