1 to 25 of 127 API Development Jobs in the UK

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, youll be instrumental in designing and building scalable, secure software systems … with strict regulatory standards. Were seeking candidates with over 5 years of relevant experience, a solid understanding of software system design, and a strong command of C# and modern API development patterns. A background in working with data systems, cloud integrations, and secure, large-scale applications will be highly advantageous. Responsibilities: Design, develop, and maintain scalable APIs and … decisions, and system documentation. Stay current with best practices and emerging technologies in software engineering and data systems. Skills & Experience: You will have the following skills or proven experience: API Development: Proven experience designing and building RESTful APIs and services at scale. Experience with authentication, authorization, and secure API communication (OAuth2, JWT, etc.). Familiarity with API More ❯

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

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

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

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

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

Contract Developer - Node.js development, REST API design, and SIP-based communications Duration: 3 months (Outside IR35) Location: Bracknell/Hybrid Contract Developer with deep expertise in Node.js development, REST API design, and SIP-based communications. This role is crucial for supporting the migration of legacy device management, call control, and configuration workflows to a secure, scalable … Cloud Migration & Refactoring: Analyse existing applications to identify dependencies on on-prem infrastructure and design cloud-native solutions. Refactor services to enhance scalability and reliability in the cloud. Service & API Development: Develop and maintain secure REST APIs for functionalities such as SIP authentication, call control, and real-time data interactions. Real-Time Communication Integration: Implement and maintain robust … Compliance: Oversee the migration of sensitive data to secure cloud storage solutions, ensuring compliance with GDPR and other regulatory standards. Required Skills & Qualifications: Experience: Minimum 3 years of backend development experience using Node.js/Express. Proven track record in building and deploying REST APIs. Experience with SIP/TLS integration and managing real-time communications. Familiarity with cloud services More ❯

Contract Developer - Node.js development, REST API design, and SIP-based communications Duration: 3 months (Outside IR35) Location: Bracknell/Hybrid Contract Developer with deep expertise in Node.js development, REST API design, and SIP-based communications. This role is crucial for supporting the migration of legacy device management, call control, and configuration workflows to a secure, scalable … Cloud Migration & Refactoring: Analyse existing applications to identify dependencies on on-prem infrastructure and design cloud-native solutions. Refactor services to enhance scalability and reliability in the cloud. Service & API Development: Develop and maintain secure REST APIs for functionalities such as SIP authentication, call control, and real-time data interactions. Real-Time Communication Integration: Implement and maintain robust … Compliance: Oversee the migration of sensitive data to secure cloud storage solutions, ensuring compliance with GDPR and other regulatory standards. Required Skills & Qualifications: Experience: Minimum 3 years of backend development experience using Node.js/Express. Proven track record in building and deploying REST APIs. Experience with SIP/TLS integration and managing real-time communications. Familiarity with cloud services More ❯

Contract Developer - Node.js development, REST API design, and SIP-based communications Duration: 3 months (Outside IR35) Location: Bracknell/Hybrid Contract Developer with deep expertise in Node.js development, REST API design, and SIP-based communications. This role is crucial for supporting the migration of legacy device management, call control, and configuration workflows to a secure, scalable … Cloud Migration & Refactoring: Analyse existing applications to identify dependencies on on-prem infrastructure and design cloud-native solutions. Refactor services to enhance scalability and reliability in the cloud. Service & API Development: Develop and maintain secure REST APIs for functionalities such as SIP authentication, call control, and real-time data interactions. Real-Time Communication Integration: Implement and maintain robust … Compliance: Oversee the migration of sensitive data to secure cloud storage solutions, ensuring compliance with GDPR and other regulatory standards. Required Skills & Qualifications: Experience: Minimum 3 years of backend development experience using Node.js/Express. Proven track record in building and deploying REST APIs. Experience with SIP/TLS integration and managing real-time communications. Familiarity with cloud services More ❯

Lead Customer Integration Team Join a fast-growing HR software company as a Technical Lead for their Integration team with Client Facing experience, leading/mentoring technical teams and API development & integrations experience (C#, .NET, SQL Server). Their cutting-edge HRIS platform streamlines everything from recruitment, onboarding to payroll and performance management. With 25% growth last year … and mentoring/leading junior team members. In this Customer-Facing role you will help customers understand and scope their requirements, coach and support software engineers through the design, development and testing of robust and maintainable solutions and oversee the technical strategy for integrations. Location: Remote-first but UK-based for essential company events. Travel to London or Glasgow … and environments Create and maintain AWS Cloud infrastructure with Infrastructure as Code principles Contribute to shaping the technical strategy and improving engineering practices Experience Required 4+ years experience in API development and integrations (REST, SOAP, GraphQL) Development experience in .NET (C#) and cloud platforms 2+ years experience leading and/or mentoring technical teams 2+ years experience More ❯

the wider community Contribute to ensuring all IT change is appropriately governed and aligns to application roadmaps and the overall IT Strategy, Standards and Practices Engage actively in business development activities to maintain a holistic view of the portfolio of change, in order to stay current with most effective solutions to address them Experience we need from you: A … global IT and business related teams, with a solid technology background, experience in capability and data models, domain driven design for application strategy, across all phases of the software development lifecycle. Additional responsibilities include ensuring IT Infrastructure and application design are secure, reliable, and regularly reviewed. This role will also develop and enhance relationship management with key service partners … They are now looking to recruit a Senior Solutions Architect to be based at the Company's Central London Offices. You will extensive and deep expertise in following Application Development areas: Expertise in application architecture using modern technologies such as cloud native development, 12 factor apps, microservices, serverless, API management, Kafka, etc. Deep knowledge of Microservices, Containers More ❯

Scrum ) and thrive in a fast-paced, dynamic setting. They should have a keen interest in emerging technologies , staying ahead of industry trends, and be committed to continuous skill development . A professional and approachable demeanor is key, as is the ability to champion the adoption of innovative technologies within the team. Experience Good knowledge of Microsoft development technologies Visual Studio 2022 onwards Strong C#/.NET experience Net/.Net Core Web API development experience API documentation generation tools Experience using IoC containers SQL Server experience Experience using Entity Framework OOAD skills and good understanding of Design Patterns and Practices Web services (SOAP and/or WCF) Unit testing/Test Driven Development Distributed WinForms systems development Desirable Familiarity with DevOps tools for managing work items and source control, with TFS experience being a plus. Alternatively, experience working in a source-controlled, continuous integration (CI) environment. Background in the finance or pensions sector, with an understanding of industry-specific requirements and practices. Proficient in SQL Server query optimisation, including performance tuning More ❯

Scrum ) and thrive in a fast-paced, dynamic setting. They should have a keen interest in emerging technologies , staying ahead of industry trends, and be committed to continuous skill development . A professional and approachable demeanor is key, as is the ability to champion the adoption of innovative technologies within the team. Experience Good knowledge of Microsoft development technologies Visual Studio 2022 onwards Strong C#/.NET experience Net/.Net Core Web API development experience API documentation generation tools Experience using IoC containers SQL Server experience Experience using Entity Framework OOAD skills and good understanding of Design Patterns and Practices Web services (SOAP and/or WCF) Unit testing/Test Driven Development Distributed WinForms systems development Desirable Familiarity with DevOps tools for managing work items and source control, with TFS experience being a plus. Alternatively, experience working in a source-controlled, continuous integration (CI) environment. Background in the finance or pensions sector, with an understanding of industry-specific requirements and practices. Proficient in SQL Server query optimisation, including performance tuning More ❯

They are now looking to recruit a Senior Solutions Architect to be based at the Company's Central London Offices. You will extensive and deep Expertise in following Application Development areas: " Expertise in application architecture using modern technologies such as cloud native development, 12 factor Apps, microservices, serverless, API management, Kafka, etc. " Deep knowledge of Microservices, Containers … REST APIs development, API Management tools (e.g. MuleSoft, Apigee), Kafka " Solution architect with broad expertise in wide range of digital technologies in areas of application platform development, web and mobile development, cloud, integration, security, etc. " Application dev experience with at least one of the cloud providers - Amazon AWS or MS Azure " Understanding of distributed computing paradigm … and exposure to building highly scalable systems. " Experience with platform modernization and cloud migration projects " Expertise in Agile development methodologies like TDD, BDD, Performance/Load testing etc. " DevOps experience - CI/CD, Test Automation, Containerization - tools and processes " Should be conversant with emerging technologies - chatbots, voice/conversational interfaces, RPA, Machine Learning, etc. " In-depth, hands-on experience More ❯

needs and aligning it to technology solutions Experience delivering solutions using an Agile/Scrum methodology Technical Requirements Expertise in application architecture using modern technologies such as cloud native development, 12 factor Apps, microservices, serverless, API management, Kafka Deep knowledge of Microservices, Containers, REST APIs development, API Management tools (e.g. MuleSoft, Apigee), Kafka Solution architect with … broad expertise in wide range of digital technologies in areas of application platform development, web and mobile development, cloud, integration, security, etc. Application dev experience with at least one of the cloud providers - Amazon AWS or MS Azure Understanding of distributed computing paradigm and exposure to building highly scalable systems Experience with platform modernization and cloud migration projects … Expertise in Agile development methodologies like TDD, BDD, Performance/Load testing etc. DevOps experience - CI/CD, Test Automation, Containerization - tools and processes Should be conversant with emerging technologies - chatbots, voice/conversational interfaces, RPA, Machine Learning, etc. In-depth, hands-on experience in developing web/mobile applications or platform with either Java/J2EE or .NET 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 … removed) Design System Familiarity with the (url removed) 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 ❯

organisation in the manufacturing industry who are embarking on an exciting transformation project to develop a brand-new B2B solution that will replace our existing platform. While the core development will be outsourced, they're building a strong internal capability to support ongoing enhancements and ensure the solution evolves with our business needs. This is a fantastic opportunity to … be involved from the ground up and make a lasting impact. Your new role Collaborate closely with external development partners and internal stakeholders to ensure the new B2B solution is aligned with business requirements, scalable, and maintainable. Provide technical oversight during the development lifecycle and build in-house capabilities to support future enhancements, integrations, and continuous improvement initiatives. … What you'll need to succeed 1+ years in a similar role within a fast-paced warehousing or logistics environment. Web Development: Proficiency in HTML, CSS, JavaScript (React, Vue.js, or similar). Experience with Liquid templating (used in BigCommerce themes). Responsive design and accessibility standards. API Development & Integration: RESTful API design and consumption. Experience with More ❯

organisation in the manufacturing industry who are embarking on an exciting transformation project to develop a brand-new B2B solution that will replace our existing platform. While the core development will be outsourced, they're building a strong internal capability to support ongoing enhancements and ensure the solution evolves with our business needs. This is a fantastic opportunity to … be involved from the ground up and make a lasting impact. Your new role Collaborate closely with external development partners and internal stakeholders to ensure the new B2B solution is aligned with business requirements, scalable, and maintainable. Provide technical oversight during the development lifecycle and build in-house capabilities to support future enhancements, integrations, and continuous improvement initiatives. … What you'll need to succeed 1+ years in a similar role within a fast-paced warehousing or logistics environment. Web Development: Proficiency in HTML, CSS, JavaScript (React, Vue.js, or similar). Experience with Liquid templating (used in BigCommerce themes). Responsive design and accessibility standards. API Development & Integration: RESTful API design and consumption. Experience with More ❯

s client is recruiting for a AI Engineer on a 6 month contract. Main Responsibilities Experienced software engineers are required to provide hands-on technical leadership to an agile development team seeking to leverage document processing and ML to realise new automation opportunities for the organisation. Enhance and expand automation services using OCR, Object Detection and LLMs. Design, develop … debugging. Data Processing: Proficient with Pandas, NumPy, SQLAlchemy/psycopg2, AWS Boto3. Cloud & Infrastructure: Hands-on AWS (Lambda, S3, CloudWatch, IAM, CDK, SQS, EKS/ECS/Kubernetes). API Development: FastAPI, REST API design, external integrations, authentication (JWT/OAuth). Software Engineering: Building production AI/ML systems, collaborative development, service/serverless architectures. … Development Practices: Agile (Scrum/Kanban), TDD, pair programming, infrastructure-as-code, monitoring tools (Grafana). This role falls outside of IR35 and is hybrid working with the expectation to attend the Edinburgh or Glasgow office as and when required. Please note that for this role you must have or be happy to get a Basic Disclosure Scotland. To More ❯

opportunity for a talented Full-Stack Developer or AI Software Engineer with strong experience in Node.js, PHP, and Python to take ownership of innovative projects that blend AI, web development, and scalable cloud systems . This role is ideal for a developer who enjoys working across the stack from building APIs and scalable back-end systems to creating user … Kubernetes, and AWS/GCP/Azure Taking the technical lead reviewing code, mentoring others, and ensuring software quality What were looking for: Strong experience with Node.js and backend development Proven background in PHP (for backend services and integrations) Knowledge of Python for AI/ML integration and data processing Experience in Full-Stack Development including front-end … AI technology, innovation, and problem-solving Whats on offer: Salary £55,000 £70,000 DOE A key role in a growing, innovative digital team Exposure to cutting-edge AI development projects Opportunity to shape architecture and lead development strategy Career progression within a forward-thinking company This is an outstanding opportunity for a Full-Stack Developer/Node.js More ❯

goals. ? Ensure product & service quality following internal and external standards. ?? Improve software processes & tooling for efficiency. ?? Ensure technical standards, documentation & processes are consistently applied. ?? Assist in refining requirements into development backlogs and demo working software in iteration reviews. ?? Support and sustain CI/CD pipelines using tools like Bitbucket, Jenkins, and Artifactory. ?? Write and lead software designs , presenting clear … solutions and guiding developers. ?? Review code & resolve issues across the project lifecycle. ?? Support technical sales & effort estimation for new initiatives. ? Essential Experience ?? 5+ years C#/.NET development (including Android). ?? 5+ years REST/RESTful API development . ?? Strong OOP, UML, Design Patterns, SOLID principles. ?? 5+ years in Agile (Scrum, Kanban, agile mindset) . ?? Hands-on … experience with SonarQube & addressing security vulnerabilities. ?? CI & automated testing (TDD/BDD). ?? Unit testing & coverage tools (e.g., NUnit, SonarQube, AltCover). ? Desired Experience ?? Embedded software development knowledge. ?? Android development (Xamarin is a plus). ??? Windows CE/Embedded & .NET Compact Framework. ?? C/C++ on Linux (embedded). ?? JavaScript technologies. ??? Database technologies. ?? JIRA for workflow management. ??? Source More ❯

exciting and rapidly evolving area of the business, they are looking for an Integration Developer to drive innovation and integration across their systems. Responsibilities: Design and develop scalable, efficient API features while ensuring best practices in security, architecture, and data governance. Collaborate with technical and non-technical stakeholders to align development with business and technology strategies. Participate in … code reviews and continuously identify opportunities for enhancement and innovation. Drive agile development by prioritising and refining the product backlog with key stakeholders. Establish and maintain best practices, development workflows, and team standards. Develop and maintain platform designs, process documentation, and solution overviews. Skills & Experience: Enterprise API Development - Experience building API Gateway solutions using REST More ❯

API Develoiper - SC Cleared + 6 month initial contract + Fully remote + £650 to £690 per day + Inside IR35 Key Skills: + Strong background in API Development - ideally Axway + SC Clearance + WebMethods Responsibilities Designing, developing and deploying of Axway policies and containers using Axway Policy Studio v7.7 Working with DevOps toolset for develop … and maintain Automated Testing and Code Deployment Provide Assistance to Axway support team to resolve technical issues Administrating the Axway Environment, using Axway Policy Studio, Axway API Manager, Cassandra and API Gateway for Deployment of Axway Patches, monitor capacity, providing service improvements Liaise with customers to define project requirements, document and design solutions Knowledge of: SFTP HTTPS SSL More ❯

range of £30,000 - £50,000 The chance to contribute to an organisation making a meaningful social impact. Working within a supportive and mission-driven environment. Opportunities for professional development and career progression. Key Responsibilities Design, development, and implementation of modern, web-based applications. Drive improvements across codebases, development practices, and deployment processes. Build and manage APIs … and cloud platforms. Work within Agile and DevOps methodologies to deliver high-quality solutions. About You Proven experience in software development with expertise in C#, .NET, Azure, and SQL . Strong background in API development, cloud adoption frameworks, and modern architectures. Excellent problem-solving skills with the ability to thrive under pressure. Skilled in CI/CD More ❯

range of £30,000 - £50,000 The chance to contribute to an organisation making a meaningful social impact. Working within a supportive and mission-driven environment. Opportunities for professional development and career progression. Key Responsibilities Design, development, and implementation of modern, web-based applications. Drive improvements across codebases, development practices, and deployment processes. Build and manage APIs … and cloud platforms. Work within Agile and DevOps methodologies to deliver high-quality solutions. About You Proven experience in software development with expertise in C#, .NET, Azure, and SQL . Strong background in API development, cloud adoption frameworks, and modern architectures. Excellent problem-solving skills with the ability to thrive under pressure. Skilled in CI/CD More ❯