51 to 75 of 498 API Development Jobs

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 – Accounting & Bookkeeping Solutions About Us My client is an award-winning software development company specialising in innovative cloud-based solutions designed for accountants and bookkeepers across the UK . Their mission is to simplify financial management through intuitive, reliable … empower 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 … 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 More ❯

Mid Level & Senior .NET Developer (Azure/API Experience) Location: Hybrid Type: Full-time, Permanent Industry: Software Development – Accounting & Bookkeeping Solutions About Us My client is an award-winning software development company specialising in innovative cloud-based solutions designed for accountants and bookkeepers across the UK . Their mission is to simplify financial management through intuitive, reliable … empower 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 … 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 More ❯

We are looking for a Senior/Lead Front-end JavaScript Developer to join our consulting client. We have multiple locations available In this role, you will lead the development of an impactful web application for a public sector programme, ensuring high performance, scalability, and maintainability. You will work closely with cross-functional teams to deliver engaging solutions that … HTML, CSS & JavaScript Collaborate with architects and other developers to design robust, scalable, and secure architectures for new projects and enhancements to existing systems. Lead and 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. Continuously improve our teams' development … the GOV.UK Design System Familiarity with the GOV.UK CASA UI framework Experience with MongoDB and NoSQL variants writing robust and scalable queries and operations Experience with TypeScript and modern development tools and practices. Knowledge of Cloud-Native development on the AWS Platform (IAM, SQS, S3, Secrets Management, KMS). Familiarity with CI/CD pipelines and DevOps practices. More ❯

data and providing self-serve access, transforming raw information into usable data services through well-designed APIs and intuitive frontend components. In this role, you'll own the application development across the full stack from designing APIs, contributing to frontend features, and guiding how data is represented and queried efficiently. You'll partner closely with data engineers and other … performance. Key Responsibilities What you will do: Design and develop APIs that standardise access to complex internal datasets (ideally using NestJS, TypeScript, and Kong) Bring thoughtful design practices to API development including versioning, authentication, and security Work on the frontend stack (React/Redux, TypeScript) to surface and display data in clear, user-friendly and intuitive ways Work … requirements and optimise queries to keep costs down Contribute to data visualisation strategy through intuitive dashboards and tools for exploring complex datasets Take full ownership of your code from development through production, help enhance our processes, and foster a collaborative, problem-solving engineering culture Collaborate with other application engineers across chapters and teams Skills, Knowledge & Expertise You will be More ❯

Job Title: Lead Java API Developer (Spring Boot) Location: Plano, TX (Onsite Local Candidates Only) Client: In-person interview required Position Summary We are seeking a Lead Java API Developer with deep expertise in Spring Boot and microservices architecture to lead the design and development of scalable, cloud-ready backend systems. In this hands-on leadership role … enterprise-level performance, security, and maintainability standards. The ideal candidate is a strong technical leader who excels in domain-driven design, CI/CD practices, and cloud-native application development, with a proven ability to mentor and influence technical direction in an agile environment. Key Responsibilities Lead the design and development of high-performance microservices using Java Spring … GitLab CI, or Azure DevOps. Champion agile practices, mentor junior developers, and foster a culture of continuous improvement and learning. Maintain high-quality technical documentation and ensure adherence to development standards. Required Qualifications 10+ years of professional software development experience. 5+ years of hands-on experience building and leading microservice-based applications using Java 8+ and Spring Boot. 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 ❯

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 ❯

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 ❯

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 ❯

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 ❯

presents significant problem solving opportunities for developers who are keen to gain experience working in London’s fast growing fintech ecosystem. Revenir’s core product is a white label API, which enhances the capabilities of banking apps, automatically refunding VAT (Value Added Tax) to customers, typically within 48 hours. Banks are now collaborating with fintechs more than ever to … customer experience through their marketplace. Summary: We are looking for a highly motivated and self-driven engineer to join our Technology team, reporting to the CTO to support the development of our proprietary AI technology and product development. This individual should have knowledge of computer science principles and software engineering to support development of Revenir’s technology. This … supporting role to our experienced technology team who have built and developed an innovative product which utilises a range of AWS services, including Lambda, SQS, Step Functions (Express & Standard), API Gateway, DynamoDB, Bedrock, and SageMaker. Responsibilities: Support API Development: Collaborate with the team to research and contribute to the design documentation of APIs, assisting in understanding requirements More ❯

presents significant problem solving opportunities for developers who are keen to gain experience working in London’s fast growing fintech ecosystem. Revenir’s core product is a white label API, which enhances the capabilities of banking apps, automatically refunding VAT (Value Added Tax) to customers, typically within 48 hours. Banks are now collaborating with fintechs more than ever to … customer experience through their marketplace. Summary: We are looking for a highly motivated and self-driven engineer to join our Technology team, reporting to the CTO to support the development of our proprietary AI technology and product development. This individual should have knowledge of computer science principles and software engineering to support development of Revenir’s technology. This … supporting role to our experienced technology team who have built and developed an innovative product which utilises a range of AWS services, including Lambda, SQS, Step Functions (Express & Standard), API Gateway, DynamoDB, Bedrock, and SageMaker. Responsibilities: Support API Development: Collaborate with the team to research and contribute to the design documentation of APIs, assisting in understanding requirements More ❯

presents significant problem solving opportunities for developers who are keen to gain experience working in London’s fast growing fintech ecosystem. Revenir’s core product is a white label API, which enhances the capabilities of banking apps, automatically refunding VAT (Value Added Tax) to customers, typically within 48 hours. Banks are now collaborating with fintechs more than ever to … customer experience through their marketplace. Summary: We are looking for a highly motivated and self-driven engineer to join our Technology team, reporting to the CTO to support the development of our proprietary AI technology and product development. This individual should have knowledge of computer science principles and software engineering to support development of Revenir’s technology. This … supporting role to our experienced technology team who have built and developed an innovative product which utilises a range of AWS services, including Lambda, SQS, Step Functions (Express & Standard), API Gateway, DynamoDB, Bedrock, and SageMaker. Responsibilities: Support API Development: Collaborate with the team to research and contribute to the design documentation of APIs, assisting in understanding requirements 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 ❯

Responsibilities: Design, develop, and maintain high-quality Java applications and microservices. Collaborate with cross-functional teams including product, UX, and QA to deliver innovative solutions. Participate in full software development lifecycle: analysis, design, development, testing, deployment, and support. Ensure code quality through unit testing, code reviews, and adherence to best practices. Troubleshoot, debug, and optimize applications for performance … programming and design patterns. Experience with Spring Framework (Spring Boot, Spring MVC, Spring Data) . Experience with relational databases (e.g., MySQL, PostgreSQL) and writing SQL queries. Knowledge of RESTful API development and integration. Familiarity with version control systems, preferably Git . Understanding of Agile/Scrum methodologies. Desirable Skills: Experience with cloud platforms (AWS, Azure, or GCP). … to £80,000. Hybrid working with 3 days in the London office. Opportunity to work on innovative projects in the travel industry. Collaborative and supportive team environment. Learning and development opportunities to grow your career. More ❯

Responsibilities: Design, develop, and maintain high-quality Java applications and microservices. Collaborate with cross-functional teams including product, UX, and QA to deliver innovative solutions. Participate in full software development lifecycle: analysis, design, development, testing, deployment, and support. Ensure code quality through unit testing, code reviews, and adherence to best practices. Troubleshoot, debug, and optimize applications for performance … programming and design patterns. Experience with Spring Framework (Spring Boot, Spring MVC, Spring Data) . Experience with relational databases (e.g., MySQL, PostgreSQL) and writing SQL queries. Knowledge of RESTful API development and integration. Familiarity with version control systems, preferably Git . Understanding of Agile/Scrum methodologies. Desirable Skills: Experience with cloud platforms (AWS, Azure, or GCP). … to £80,000. Hybrid working with 3 days in the London office. Opportunity to work on innovative projects in the travel industry. Collaborative and supportive team environment. Learning and development opportunities to grow your career. More ❯

Responsibilities: Design, develop, and maintain high-quality Java applications and microservices. Collaborate with cross-functional teams including product, UX, and QA to deliver innovative solutions. Participate in full software development lifecycle: analysis, design, development, testing, deployment, and support. Ensure code quality through unit testing, code reviews, and adherence to best practices. Troubleshoot, debug, and optimize applications for performance … programming and design patterns. Experience with Spring Framework (Spring Boot, Spring MVC, Spring Data) . Experience with relational databases (e.g., MySQL, PostgreSQL) and writing SQL queries. Knowledge of RESTful API development and integration. Familiarity with version control systems, preferably Git . Understanding of Agile/Scrum methodologies. Desirable Skills: Experience with cloud platforms (AWS, Azure, or GCP). … to £80,000. Hybrid working with 3 days in the London office. Opportunity to work on innovative projects in the travel industry. Collaborative and supportive team environment. Learning and development opportunities to grow your career. More ❯

Responsibilities: Design, develop, and maintain high-quality Java applications and microservices. Collaborate with cross-functional teams including product, UX, and QA to deliver innovative solutions. Participate in full software development lifecycle: analysis, design, development, testing, deployment, and support. Ensure code quality through unit testing, code reviews, and adherence to best practices. Troubleshoot, debug, and optimize applications for performance … programming and design patterns. Experience with Spring Framework (Spring Boot, Spring MVC, Spring Data) . Experience with relational databases (e.g., MySQL, PostgreSQL) and writing SQL queries. Knowledge of RESTful API development and integration. Familiarity with version control systems, preferably Git . Understanding of Agile/Scrum methodologies. Desirable Skills: Experience with cloud platforms (AWS, Azure, or GCP). … to £80,000. Hybrid working with 3 days in the London office. Opportunity to work on innovative projects in the travel industry. Collaborative and supportive team environment. Learning and development opportunities to grow your career. More ❯