1 to 25 of 90 API Development Jobs in the North of England

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 ❯

API Architect Location - Edinburgh ( Weekly 2days Onsite and 3 days remote) Inside Ir35 Contract Job Summary: Looking for an Technical Architect that shall define, develop and maintain the Application Programming Interfaces for specific business functional/technical areas and provide high-level roadmaps for the implementation of the robust API solutions, aligning to a common technical direction ensuring … accomplishment of the roadmaps. Key Responsibilities Design and define API architecture and standards. Collaborate with development teams to implement scalable API solutions. Ensure API security, reliability, and performance. Establish and enforce best practices for API development. Evaluate and select appropriate technologies and tools. Document architectural decisions and API specifications. Mentor and guide software engineers … on API-related topics. Review and improve existing API implementations. Work with stakeholders to gather requirements and align API strategy. Monitor API usage and optimize for scalability and efficiency. Requirements Bachelor’s or master’s degree in computer science or related field. Proven experience designing and implementing APIs. Strong knowledge of RESTful and GraphQL API 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 ❯

operating from 52 countries. Founded in 1976, HCL is one of India's original IT garage start-ups. For more on HCL, please visit www.hcl.com Job Title: Technical Architect – API Location: Edinburgh, UK Experience Level: 15+ years Mode of Hiring- Permanent Position Job Description- Looking for a Technical Architect that shall define, develop and maintain the Application Programming Interfaces … for specific business functional/technical areas and provide high-level roadmaps for the implementation of the robust API solutions, aligning to a common technical direction ensuring accomplishment of the roadmaps. Key Responsibilities- Design and define API architecture and standards. Collaborate with development teams to implement scalable API solutions. Ensure API security, reliability, and performance. … Establish and enforce best practices for API development. Evaluate and select appropriate technologies and tools. Document architectural decisions and API specifications. Mentor and guide software engineers on API-related topics. Review and improve existing API implementations. Work with stakeholders to gather requirements and align API strategy. Monitor API usage and optimize for scalability and More ❯

who will define, develop, and maintain Application Programming Interfaces (APIs) for specific business functional and technical areas. This role involves creating high-level roadmaps for the implementation of robust API solutions, ensuring alignment with a common technical direction to achieve these objectives. Key Responsibilities Design and define API architecture and standards. Collaborate with development teams to implement … scalable API solutions. Ensure API security, reliability, and performance. Establish and enforce best practices for API development. Evaluate and select appropriate technologies and tools. Document architectural decisions and API specifications. Mentor and guide software engineers on API-related topics. Review and improve existing API implementations. Work with stakeholders to gather requirements and align API strategy. Monitor API usage and optimize for scalability and efficiency. Requirements Bachelor’s or master’s degree in computer science or related field. Proven experience designing and implementing APIs. Strong knowledge of RESTful and GraphQL API design principles. Experience with microservices architecture and cloud platforms. Familiarity with API security standards and best practices. Excellent problem-solving 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 ❯

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 ❯

Greater Manchester My client is hiring for a .NET Developer to work on new and evolving products used by major UK brands. You will be involved in the full development lifecycle, from system design and implementation to deployment and optimisation. This is a hands-on technical role focused on scalable API development, cloud integration, and continuous delivery. … Building and maintaining services using ASP.NET Core, C#, MVC, and Razor Designing and integrating RESTful APIs for both internal and third-party systems Writing tested, maintainable code using modern development practices Working across SQL Server for data design and access Collaborating within Agile teams using sprints or Kanban Deploying to cloud platforms (primarily Azure ) using CI/CD pipelines … Requirements 5+ years of .NET development experience , with full-stack exposure Practical experience with ASP.NET Core, C#, Web API, HTML/CSS/JavaScript Strong understanding of software design principles (SOLID, design patterns) Experience with Git , version control workflows, and CI tools Exposure to cloud technologies , ideally Azure (App Services, DevOps, etc.) Bonus if you’ve worked with More ❯

Work With: Our client is a leading global technology and engineering solutions company, delivering next-generation digital transformation initiatives. You will work as part of a high-performing Agile development team focused on building a credit decisioning engine powered by scalable microservices and cloud-native solutions. About the Role: As a Java Fullstack Engineer , you will play a pivotal … and frontend features focused on performance and reliability. Work closely with architects and product owners to define and implement technical solutions aligned with business goals. Required Skills & Experience: Backend Development: 8–15 years of experience with Java, Spring Boot , and microservices architecture . Java 17: Hands-on experience is mandatory . DevOps & Cloud: Proven experience with GCP , AWS , or … Azure , and familiarity with CI/CD pipelines . API Development: Expertise in RESTful API design and development. Frontend: Working knowledge of ReactJS or Angular . Testing: Strong background in automated testing , including JUnit . Mindset: Excellent communication skills and a commitment to continuous learning in a collaborative Agile environment. Good to Have: Experience with GCP Data More ❯

Senior API/PHP Developer – Fully Remote (UK) – £80,000+ Venchr is partnering with a fast-growing SaaS company that’s redefining financial management in the luxury and yachting sector. Their platform unites accounting, payments, FX, and project management into a single, powerful ecosystem — helping clients worldwide streamline complex operations with ease. They’re now seeking a Lead PHP … Developer with a strong focus on API architecture and backend systems to join their fully remote UK-based engineering team. In this role, you’ll take ownership of designing, developing, and optimizing APIs that power mission-critical services. You’ll collaborate closely with product, DevOps, and frontend teams to ensure the platform remains scalable, secure, and future-proof. Beyond … hands-on coding, you’ll play a key part in setting technical standards, mentoring other engineers, and driving forward the API and integration strategy that underpins the company’s growth. What You’ll Bring Proven experience leading backend/API development using PHP and Laravel Expertise in RESTful API design, versioning, authentication, and performance optimization Strong More ❯

Senior API/PHP Developer – Fully Remote (UK) – £80,000+ Venchr is partnering with a fast-growing SaaS company that’s redefining financial management in the luxury and yachting sector. Their platform unites accounting, payments, FX, and project management into a single, powerful ecosystem — helping clients worldwide streamline complex operations with ease. They’re now seeking a Lead PHP … Developer with a strong focus on API architecture and backend systems to join their fully remote UK-based engineering team. In this role, you’ll take ownership of designing, developing, and optimizing APIs that power mission-critical services. You’ll collaborate closely with product, DevOps, and frontend teams to ensure the platform remains scalable, secure, and future-proof. Beyond … hands-on coding, you’ll play a key part in setting technical standards, mentoring other engineers, and driving forward the API and integration strategy that underpins the company’s growth. What You’ll Bring Proven experience leading backend/API development using PHP and Laravel Expertise in RESTful API design, versioning, authentication, and performance optimization Strong More ❯

Senior API/PHP Developer – Fully Remote (UK) – £80,000+ Venchr is partnering with a fast-growing SaaS company that’s redefining financial management in the luxury and yachting sector. Their platform unites accounting, payments, FX, and project management into a single, powerful ecosystem — helping clients worldwide streamline complex operations with ease. They’re now seeking a Lead PHP … Developer with a strong focus on API architecture and backend systems to join their fully remote UK-based engineering team. In this role, you’ll take ownership of designing, developing, and optimizing APIs that power mission-critical services. You’ll collaborate closely with product, DevOps, and frontend teams to ensure the platform remains scalable, secure, and future-proof. Beyond … hands-on coding, you’ll play a key part in setting technical standards, mentoring other engineers, and driving forward the API and integration strategy that underpins the company’s growth. What You’ll Bring Proven experience leading backend/API development using PHP and Laravel Expertise in RESTful API design, versioning, authentication, and performance optimization Strong More ❯

Senior API/PHP Developer – Fully Remote (UK) – £80,000+ Venchr is partnering with a fast-growing SaaS company that’s redefining financial management in the luxury and yachting sector. Their platform unites accounting, payments, FX, and project management into a single, powerful ecosystem — helping clients worldwide streamline complex operations with ease. They’re now seeking a Lead PHP … Developer with a strong focus on API architecture and backend systems to join their fully remote UK-based engineering team. In this role, you’ll take ownership of designing, developing, and optimizing APIs that power mission-critical services. You’ll collaborate closely with product, DevOps, and frontend teams to ensure the platform remains scalable, secure, and future-proof. Beyond … hands-on coding, you’ll play a key part in setting technical standards, mentoring other engineers, and driving forward the API and integration strategy that underpins the company’s growth. What You’ll Bring Proven experience leading backend/API development using PHP and Laravel Expertise in RESTful API design, versioning, authentication, and performance optimization Strong More ❯

Senior API/PHP Developer – Fully Remote (UK) – £80,000+ Venchr is partnering with a fast-growing SaaS company that’s redefining financial management in the luxury and yachting sector. Their platform unites accounting, payments, FX, and project management into a single, powerful ecosystem — helping clients worldwide streamline complex operations with ease. They’re now seeking a Lead PHP … Developer with a strong focus on API architecture and backend systems to join their fully remote UK-based engineering team. In this role, you’ll take ownership of designing, developing, and optimizing APIs that power mission-critical services. You’ll collaborate closely with product, DevOps, and frontend teams to ensure the platform remains scalable, secure, and future-proof. Beyond … hands-on coding, you’ll play a key part in setting technical standards, mentoring other engineers, and driving forward the API and integration strategy that underpins the company’s growth. What You’ll Bring Proven experience leading backend/API development using PHP and Laravel Expertise in RESTful API design, versioning, authentication, and performance optimization Strong More ❯

Senior API/PHP Developer – Fully Remote (UK) – £80,000+ Venchr is partnering with a fast-growing SaaS company that’s redefining financial management in the luxury and yachting sector. Their platform unites accounting, payments, FX, and project management into a single, powerful ecosystem — helping clients worldwide streamline complex operations with ease. They’re now seeking a Lead PHP … Developer with a strong focus on API architecture and backend systems to join their fully remote UK-based engineering team. In this role, you’ll take ownership of designing, developing, and optimizing APIs that power mission-critical services. You’ll collaborate closely with product, DevOps, and frontend teams to ensure the platform remains scalable, secure, and future-proof. Beyond … hands-on coding, you’ll play a key part in setting technical standards, mentoring other engineers, and driving forward the API and integration strategy that underpins the company’s growth. What You’ll Bring Proven experience leading backend/API development using PHP and Laravel Expertise in RESTful API design, versioning, authentication, and performance optimization Strong More ❯

Senior Backend or Full Stack Developer (Contract, AI-Driven Environment) I'm looking for an experienced full stack or backend-focused senior developer to support API development and backend delivery for a high-traffic consumer platform. You'll work alongside front-end engineers to build scalable, secure, and performant systems using modern tools and AI-assisted development. You … if you: Deliver production-ready APIs fast and independently Have proven experience with consumer-facing platforms Use AI coding tools (Cursor, Claude Code, Codex, or similar) to speed up development (this can be personal projects if no commercial experience) Make confident technical decisions with minimal guidance Follow clear architectural standards and established development patterns Understand backend performance, scalability … traffic environments We're not looking for: Developers needing extensive supervision or mentoring Anyone without production experience in consumer-facing systems Core Technical Requirements: Node.js (extensive production experience) RESTful API design and development (production experience) Database design and optimization (SQL and/or NoSQL) Authentication, authorization, and security best practices AI coding tools (GitHub Copilot, Claude, Cursor, or More ❯

Senior Backend or Full Stack Developer (Contract, AI-Driven Environment) I'm looking for an experienced full stack or backend-focused senior developer to support API development and backend delivery for a high-traffic consumer platform. You’ll work alongside front-end engineers to build scalable, secure, and performant systems using modern tools and AI-assisted development. You … if you: Deliver production-ready APIs fast and independently Have proven experience with consumer-facing platforms Use AI coding tools (Cursor, Claude Code, Codex, or similar) to speed up development (this can be personal projects if no commercial experience) Make confident technical decisions with minimal guidance Follow clear architectural standards and established development patterns Understand backend performance, scalability … traffic environments We’re not looking for: Developers needing extensive supervision or mentoring Anyone without production experience in consumer-facing systems Core Technical Requirements: Node.js (extensive production experience) RESTful API design and development (production experience) Database design and optimization (SQL and/or NoSQL) Authentication, authorization, and security best practices AI coding tools (GitHub Copilot, Claude, Cursor, or More ❯

Senior Backend or Full Stack Developer (Contract, AI-Driven Environment) I'm looking for an experienced full stack or backend-focused senior developer to support API development and backend delivery for a high-traffic consumer platform. You’ll work alongside front-end engineers to build scalable, secure, and performant systems using modern tools and AI-assisted development. You … if you: Deliver production-ready APIs fast and independently Have proven experience with consumer-facing platforms Use AI coding tools (Cursor, Claude Code, Codex, or similar) to speed up development (this can be personal projects if no commercial experience) Make confident technical decisions with minimal guidance Follow clear architectural standards and established development patterns Understand backend performance, scalability … traffic environments We’re not looking for: Developers needing extensive supervision or mentoring Anyone without production experience in consumer-facing systems Core Technical Requirements: Node.js (extensive production experience) RESTful API design and development (production experience) Database design and optimization (SQL and/or NoSQL) Authentication, authorization, and security best practices AI coding tools (GitHub Copilot, Claude, Cursor, or More ❯

Senior Backend or Full Stack Developer (Contract, AI-Driven Environment) I'm looking for an experienced full stack or backend-focused senior developer to support API development and backend delivery for a high-traffic consumer platform. You’ll work alongside front-end engineers to build scalable, secure, and performant systems using modern tools and AI-assisted development. You … if you: Deliver production-ready APIs fast and independently Have proven experience with consumer-facing platforms Use AI coding tools (Cursor, Claude Code, Codex, or similar) to speed up development (this can be personal projects if no commercial experience) Make confident technical decisions with minimal guidance Follow clear architectural standards and established development patterns Understand backend performance, scalability … traffic environments We’re not looking for: Developers needing extensive supervision or mentoring Anyone without production experience in consumer-facing systems Core Technical Requirements: Node.js (extensive production experience) RESTful API design and development (production experience) Database design and optimization (SQL and/or NoSQL) Authentication, authorization, and security best practices AI coding tools (GitHub Copilot, Claude, Cursor, or More ❯

Senior Backend or Full Stack Developer (Contract, AI-Driven Environment) I'm looking for an experienced full stack or backend-focused senior developer to support API development and backend delivery for a high-traffic consumer platform. You’ll work alongside front-end engineers to build scalable, secure, and performant systems using modern tools and AI-assisted development. You … if you: Deliver production-ready APIs fast and independently Have proven experience with consumer-facing platforms Use AI coding tools (Cursor, Claude Code, Codex, or similar) to speed up development (this can be personal projects if no commercial experience) Make confident technical decisions with minimal guidance Follow clear architectural standards and established development patterns Understand backend performance, scalability … traffic environments We’re not looking for: Developers needing extensive supervision or mentoring Anyone without production experience in consumer-facing systems Core Technical Requirements: Node.js (extensive production experience) RESTful API design and development (production experience) Database design and optimization (SQL and/or NoSQL) Authentication, authorization, and security best practices AI coding tools (GitHub Copilot, Claude, Cursor, or More ❯

transformation. What You’ll Get: Access to a dedicated wellbeing hub and staff support networks Flexible working arrangements to suit your lifestyle Generous annual leave and pension scheme Professional development through extensive training programmes Salary sacrifice schemes for childcare, electronics, and savings Opportunities to work on innovative projects that impact real lives The Role: As a Senior Front-End … Developer, you’ll lead the design and development of secure, scalable web applications using modern Typescript/JavaScript frameworks. You’ll work in an agile, cross-functional team, contributing to strategic digital initiatives and mentoring junior developers. Key Responsibilities: Develop and maintain high-quality front-end solutions using React. Collaborate with designers, back-end developers, and stakeholders to deliver … APIs and manage CI/CD pipelines Write robust unit tests using tools like Jest Contribute to architectural decisions and technical strategy Support continuous improvement and innovation across the development lifecycle Essential Skills: Expert-level proficiency in HTML, CSS, JavaScript Strong experience with React. Familiarity with cloud platforms (Azure or AWS) Experience with CI/CD and API More ❯

/BDD principles Create and maintain RESTful and GraphQL APIs Collaborate with POs, BAs, and stakeholders to define solutions Mentor junior developers and promote best practices Drive improvements in development processes and tools What You Bring 5+ years of backend development experience Expertise in C#, .NET (preferably .NET 6+), and SQL Server Deep understanding of SOLID and OOP … principles Skilled in Git, Unit Testing (NUnit), and API development Familiarity with CI/CD pipelines and agile methodologies Strong communication and problem-solving skills Desire to grow within a dynamic and evolving team Why Join? This is an incredible opportunity to make your mark in a company that prioritises purpose, innovation, and professional growth. You'll be … part of a team where your ideas are welcomed, your development is encouraged, and your work truly matters. Ready to build something that helps others-and builds your career in the process? Apply today. 48954MSR2 INDMANS More ❯

a sophisticated core platform built with .NET (C#) and hosted on Microsoft Azure , applying modern microservices architecture at scale. You’ll also gain exposure to Node.js and TypeScript for API development and integration work, plus Angular for front-end experiences. The environment includes modern DevOps practices with Terraform (IaC) , GitHub Actions (CI/CD) , and Kubernetes for scalability More ❯

Manchester (3 days per week in office, Tuesday–Thursday), the successful candidate will be responsible for designing, developing, and maintaining modern cloud-based systems. You will work across backend development, DevOps, and infrastructure as code, collaborating closely with global teams in Australia, the U.S., and locally in Manchester. Key Responsibilities: Backend Development (50%) Design, develop, and enhance backend … requirements into technical solutions in collaboration with Product Owners. DevOps/Cloud Operations (40%) Work with AWS to manage, optimise, and secure cloud infrastructure. Deploy and maintain services across development, testing, and production environments. Detect and prevent security threats, including account takeover attempts. Drive continuous improvement in technical standards, tools, and processes. Infrastructure as Code (10%) Deploy and manage … architects and global teams to implement reusable and maintainable infrastructure components. Required Qualifications: Strong expertise in cloud computing and services (AWS experience preferred). Proficiency in TypeScript and REST API development ; experience with NestJS preferred. Deep understanding of cloud security principles , including IAM, networking, and encryption. Experience with web services and microservices-based architectures . Excellent communication skills More ❯

Manchester (3 days per week in office, Tuesday-Thursday), the successful candidate will be responsible for designing, developing, and maintaining modern cloud-based systems. You will work across backend development, DevOps, and infrastructure as code, collaborating closely with global teams in Australia, the U.S., and locally in Manchester. Key Responsibilities: Backend Development (50%) Design, develop, and enhance backend … requirements into technical solutions in collaboration with Product Owners. DevOps/Cloud Operations (40%) Work with AWS to manage, optimise, and secure cloud infrastructure. Deploy and maintain services across development, testing, and production environments. Detect and prevent security threats, including account takeover attempts. Drive continuous improvement in technical standards, tools, and processes. Infrastructure as Code (10%) Deploy and manage … architects and global teams to implement reusable and maintainable infrastructure components. Required Qualifications: Strong expertise in cloud computing and services (AWS experience preferred). Proficiency in TypeScript and REST API development ; experience with NestJS preferred. Deep understanding of cloud security principles , including IAM, networking, and encryption. Experience with web services and microservices-based architectures . Excellent communication skills More ❯