1 to 25 of 41 Permanent API Development Jobs in the UK excluding London

This is a hands-on technical leadership role with broad ownership across distributed systems and data platforms. Your remit covers: Leading the design and development of distributed, fault-tolerant systems Building and scaling reporting and analytics platforms that handle high data volumes Owning technical delivery from concept through … What We're Looking For Essential 7+ years building scalable, distributed systems Strong experience with object-oriented programming languages Experience with backend frameworks and API development Strong SQL skills and proven ability working with large datasets Experience with cloud platforms such as AWS, GCP, or Azure Experience with ...

environment, you'll collaborate closely with the wider Delivery team to design, build and maintain high-quality software solutions. You'll contribute throughout the development lifecycle, from shaping technical solutions and planning through to implementation, testing, deployment and ongoing improvement. You will work across a modern Microsoft technology stack … services while helping to influence how we design, develop, and deliver our products . We encourage developers to explore new technologies , including AI-assisted development tools and automation, where they can deliver genuine value for our customers and teams. Key Responsibilities Working under the guidance of the Team Leader ...

lead projects, mentor junior developers, and work on high-impact, secure banking solutions. You will be a key contributor to web portal and API development, ensuring performance, security, and reliability in a dynamic environment. This role is ideal for developers with strong technical expertise who are looking … portals using ASP.NET MVC/.NET Core Design and integrate REST APIs with internal and third-party services Implement secure authentication mechanisms (JWT, OAuth2, API Keys) Connect applications to relational databases using Entity Framework Core (DbContext, LINQ, Migrations) Debug and trace request flows from UI Controller API Database ...

Overview Provide technical leadership across development teams to ensure the design and delivery of high-quality, scalable, and maintainable software solutions. The role combines hands-on development expertise with leadership responsibilities, translating business requirements into robust technical solutions while driving engineering excellence, delivery consistency, and collaboration across onshore … offshore teams. Responsibilities Technical Leadership & Solution Delivery Lead the design and development of key features, components, and services across the application stack Provide hands-on guidance in building scalable applications using React, Node.js, and TypeScript Own critical technical decisions, ensuring alignment with architectural standards and long-term scalability goals ...

deployment and contribute to technical decision-making. The Role Working across a range of applications and services, you'll contribute to both new product development and the ongoing evolution of existing platforms. Responsibilities include: Building new features and functionality Developing and maintaining APIs Working across backend and frontend systems … engineers who have experience developing commercial web applications and enjoy solving technical challenges across a varied technology environment. You'll ideally have: Commercial software development experience Strong Python development skills Experience building and maintaining web applications API development experience Experience working with Git and collaborative development ...

working within embedded Linux environments, supporting build and release processes, contributing to automated testing, and helping improve how software moves from development into production. You'll work closely with colleagues developing hardware platforms and AI-driven algorithms, helping bring new capabilities into products that are already deployed in demanding … Linux environments and be comfortable owning technical work from concept through to delivery. We're particularly interested in people with experience of: Modern C++ development within Linux-based systems Embedded Linux environments, ideally involving Yocto or Buildroot Python for scripting, automation, tooling or API-related development CMake ...

deployment and contribute to technical decision-making. The Role Working across a range of applications and services, you'll contribute to both new product development and the ongoing evolution of existing platforms. Responsibilities include: Building new features and functionality Developing and maintaining APIs Working across backend and frontend systems … engineers who have experience developing commercial web applications and enjoy solving technical challenges across a varied technology environment. You'll ideally have: Commercial software development experience Strong Python development skills Experience building and maintaining web applications API development experience Experience working with Git and collaborative development ...

looking for an experienced Mid-Level Full Stack Developer to join our engineering team and play a significant role in the design, development, and delivery of our products. This role is ideal for someone at the upper end of mid-level, with strong commercial experience across both frontend … backend development who is ready to take real ownership of their work. You will deliver features end to end with minimal supervision, contribute to technical and design decisions, and help raise standards across the team. The role combines hands-on development with a growing influence ...

engineering practices, integrate AI models and agent patterns, and contribute to the evolution of our cloud-native services. You will already have strong software development experience and have a desire to grow deeper into engineering, while maintaining strong software craftsmanship and delivery discipline. As we move toward … ecosystem. You will help implement AI capabilities, support cloud-native services, and strengthen the squad’s engineering excellence as we scale. Key Responsibilities Software Development & Delivery: Design, build, test, and maintain high-quality software components and services across backend, frontend, or full-stack environments. Utilise AI Accelerated development ...

issues and claims through a single, customer-focused solution. The team is now growing and looking for another developer to contribute to both new development and the continued improvement of existing services. Software Developer Backend/Full-Stack Southampton, Hampshire - Hybrid, 2-3 days per week in the office … also be scope to work across the full stack for someone who wants broader exposure. The team is also actively exploring how AI-assisted development and agentic systems can improve the way software is built and delivered. You do not need to be an AI tooling expert ...

environment, you'll collaborate closely with the wider Delivery team to design, build and maintain high-quality software solutions. You'll contribute throughout the development lifecycle, from shaping technical solutions and planning through to implementation, testing, deployment and ongoing improvement. You will work across a modern Microsoft technology stack … design, develop, and deliver our products. You will be supported by experienced colleagues and encouraged to explore new technologies, including AI-assisted development tools and automation, where they can deliver genuine value for our customers and teams. Key Responsibilities Working under the guidance of the Team Leader and other ...

Document all solutions, as well as driving architectural decisions within the team. Demonstrate a willingness to learn and further technologies & techniques embraced by the development team. Cultivate strong working relationships both within the team and across HL as a whole. Actively participating in working groups and communities of practice … designed to support the development team. Providing engineering support for existing applications when necessary. Proactively coaching & mentoring to peers. Comfortable engaging with external stakeholders, such as security, enterprise architecture and downstream consumers of your team's services. Evangelise best practices and assist the team in avoiding anti-patterns. Experience ...

technical strategy Work within a senior, AI-first engineering environment KEY POINTS Senior technical leadership role with significant architectural ownership Leading the design and development of a modern platform rebuild Strong focus on Node.js, TypeScript, React and cloud technologies Opportunity to shape engineering standards, architecture and AI adoption ABOUT … technologies and cloud infrastructure. Working closely with Product teams, stakeholders and fellow engineers, you'll help establish engineering standards, drive adoption of AI-assisted development practices and provide technical mentorship across the team. The organisation has embraced an AI-first approach to software engineering, making extensive use of modern ...

building scalable, production-ready applications across both the frontend and backend. Working within a collaborative engineering team, you will help shape software architecture, development standards, testing practices and long-term product direction. Whilst some projects involve sophisticated physical systems and devices, prior experience with hardware-integrated software environments … commercial experience in full-stack software engineering Strong JavaScript and TypeScript experience Experience building scalable backend systems using Node.js, NestJS or similar frameworks Frontend development experience using Angular or similar modern frontend frameworks Experience designing and developing RESTful APIs Experience working within Linux-based environments Strong understanding of software ...

designing and developing high-quality software while collaborating closely with product, design, and engineering teams. The successful candidate will have strong full-stack development experience and ideally a background working with communication platforms such as Twilio. This role is based in Central Manchester 4 days a week … Developer role. Strong proficiency in JavaScript/TypeScript, Node.js, and React. Experience building and maintaining real-time, event-driven applications. Solid understanding of RESTful API development and microservices architecture. Hands-on experience with AWS serverless technologies, including Lambda, DynamoDB, and API Gateway. Experience working with CI/ ...

product from the ground up. This is an opportunity to work on a genuinely interesting product where you'll have ownership across the entire development lifecycle, helping shape both the user experience and the underlying platform architecture. The Opportunity: We're looking for a Full-Stack Developer with strong … ease. As a Full-Stack Developer, you'll contribute across the full technology stack, from creating intuitive React interfaces and workflow builders through to API development, database design and security-focused architecture. What You'll Be Doing: Building and enhancing full-stack features using Next.js, React and TypeScript ...

full stack in a modern cloud environment, building products that genuinely help people develop and progress? We're working with an ambitious training and development company that is reshaping how organisations deliver learning. As their platform continues to scale, they're looking to hire an Intermediate Software Engineer with …/CD & Version Control: Git-based workflows and automated pipelines What We're Looking For 2-4 years' commercial software development experience Strong hands-on experience with Node.js and API development Solid frontend experience with React Exposure to cloud infrastructure, ideally AWS Experience working with relational ...

JavaScript The Role As a motivated Junior Software Developer, you'll join a collaborative engineering team working on core business platforms and new product development initiatives. You'll gain exposure to the full software development lifecycle, working alongside experienced developers to build, maintain, and improve scalable applications. Requirements … Computer Science degree or equivalent commercial experience Exposure to software development through university projects, commercial work, or personal projects PHP and MVC framework experience (Laravel preferred) HTML, CSS, JavaScript, and SQL Object-Oriented Programming (OOP) Git/Version Control Ability to write clean, maintainable, and organised code Strong communication ...

promptly Experience with Copilot, Copilot Studio, and Agents Strong knowledge of Exchange Online Strong understanding of the Microsoft 365 tenant platform Experience with Graph API and API development Experience with Entra backup solutions, including Rubrik Ability to identify risk mitigation opportunities and develop new policies and procedures ...

stakeholders to turn complex requirements into real, scalable solutions. You will not be maintaining legacy systems or doing incremental work. This is greenfield AI development with serious commercial impact. What's In It For You? Up to 39 days' annual leave with service (including public holidays) Hybrid and flexible … core hours working Pension, Health Insurance, Life Assurance and Income Protection Cover Career Development Framework and Professional Certification programme Colleague Reward and Recognition scheme Volunteering opportunities, wellness sessions, and organised social events Free parking, eye care scheme, and daily fruit and cereal on-site Competitive salary based on experience ...

team on an initial 3-6 month contract. Location: Belfast (Hybrid) Contract: 3-6 Months Daily Rate Essential Skills 5+ years of commercial Python development experience Previous experience within FinTech, Banking, Payments, or Financial Services Strong knowledge of Python and API development (FastAPI, Flask, or Django) Experience ...

develop new functionality and make non-functional improvements to our products and services. Understand business requirements and how they translate into technical design and development projects and tasks. Participate in architectural and design discussions and diagnose and troubleshoot complex technical issues Work with stakeholders to progress and report … projects and tasks Building Voice Agents: Developing and maintaining our Go-based Voice Agent API Development: Contributing to our unified AI API that acts as the gateway between our telephony products and various AI providers Tool Creation: Developing "Tools" (Function Calling) that allow LLMs to interact with ...

join our engineering team. This role offers the opportunity to work on scalable systems, modern applications, and cloud-based infrastructure while contributing to the development of innovative digital products and services. As part of a collaborative Agile team, you will work closely with engineers, product managers, designers, and other … technical design, architecture, and solution planning activities. Collaborate with cross-functional teams to deliver projects and product enhancements. Troubleshoot, diagnose, and resolve issues across development and production environments. Promote high standards of code quality, testing, and engineering best practice. Participate in Agile ceremonies and contribute to continuous improvement initiatives. ...

production systems and own their reliability Tech Stack Skills: Language: C# on .NET (primary, and what youll write every day) Frameworks: ASP.NET Core (Web API), Azure Functions (isolated worker) Database: SQL Server, accessed via Entity Framework Core and/or Dapper (youll write queries, design schemas, and optimise performance … foundation . The Azure-specific skills can be learned on the job. Requirements: You Must Have 7+ years professional software development experience, primarily in C#/.NET, including time leading, mentoring, or coaching other engineers People leadership: youve coached, mentored, or line-managed developers, and you get satisfaction from ...

BENEFITS £50-60k salary depending on experience Hybrid working - 4 days per week on-site, 1 day remote Modern technology stack and greenfield development opportunities Opportunity to mentor and lead a growing engineering team High level of ownership and influence across architecture and delivery Collaborative and ambitious engineering … .NET MAUI mobile applications - contributing from concept through to deployment. ESSENTIAL SKILLS Strong commercial experience with C#/.NET Modern .NET 8/10 development experience Blazor/Razor Components ASP.NET Core REST API development Entity Framework Core AWS infrastructure experience MySQL CI/CD pipelines using ...