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        723



        1,331 Contract API jobs in UK + 20 miles

        Software Engineer with AI Integration

        Alexander Mae (Bristol) Ltd
        BS1, Bristol
        From £30,000 to £35,000 per annum
        Integrate external AI services (e.g., OpenAI API) into prototypes and production features.
        Integrate external AI services (e.g., OpenAI API) into prototypes and production features.

        Senior Solution Architect

        UK Health Security Agency
        Canary Wharf, E14 4PU
        From £54,416 to £68,344 per annum
        The United Kingdom Health Security Agency (UKHSA) is a system leader for health security; taking action internationally to strengthen global health security, providing trusted advice to government and the public and reducing inequalities in the way different communities experience and are impacted by infectious disease, environmental hazards, and other threats to health. UKHSAs remit, as an agency with a global-to-local reach, is to protect the health of the nation from infectious diseases and other external threats to health. * Prevent: anticipate threats to health and help build the nations readiness, defences and health security * Detect: use cutting edge environmental and biological surveillance to proactively detect and monitor infectious diseases and threats to health * Analyse: use world-class science and data analytics to assess and continually monitor threats
        The United Kingdom Health Security Agency (UKHSA) is a system leader for health security; taking action internationally to strengthen global health security, providing trusted advice to government and the public and reducing inequalities in the way different communities experience and are impacted by infectious disease, environmental hazards, and other threats to health. UKHSAs remit, as an agency with a global-to-local reach, is to protect the health of the nation from infectious diseases and other external threats to health. * Prevent: anticipate threats to health and help build the nations readiness, defences and health security * Detect: use cutting edge environmental and biological surveillance to proactively detect and monitor infectious diseases and threats to health * Analyse: use world-class science and data analytics to assess and continually monitor threats
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        NEW

        Lead .Net Software Developer

        Hireful
        Milton Keynes, Buckinghamshire
        £65k - £75k base salary plus Bonus and awesome benefits
        Are you a hands-on Lead or Senior .Net Developer ready to shape architecture and guide talented developers? Want a hybrid role with 3 days WFH? This is your chance to stay close to the code while making key technical decisions that drive real business impact. You'll join a collaborative, forward-thinking team building cutting-edge products — with the support, tools, and flexibility to thrive. Role: Lead Software Developer, Senior .Net Developer, Software Engineering Manager, Senior Full Stack Developer, Lead .Net Developer, Lead Software Engineer, Senior C# Developer - Salary: £65k - £75k base + Bonus - Benefits: 5% pension, 25 days holiday, 2 wellbeing days, Christmas shutdown, private healthcare, life assurance, cinema tickets & more - Location: Milton Keynes – Hybrid (2 days a week in office) If you’ve got strong .Net (C#) experience and skills in GitHub, APIs, Pos
        Are you a hands-on Lead or Senior .Net Developer ready to shape architecture and guide talented developers? Want a hybrid role with 3 days WFH? This is your chance to stay close to the code while making key technical decisions that drive real business impact. You'll join a collaborative, forward-thinking team building cutting-edge products — with the support, tools, and flexibility to thrive. Role: Lead Software Developer, Senior .Net Developer, Software Engineering Manager, Senior Full Stack Developer, Lead .Net Developer, Lead Software Engineer, Senior C# Developer - Salary: £65k - £75k base + Bonus - Benefits: 5% pension, 25 days holiday, 2 wellbeing days, Christmas shutdown, private healthcare, life assurance, cinema tickets & more - Location: Milton Keynes – Hybrid (2 days a week in office) If you’ve got strong .Net (C#) experience and skills in GitHub, APIs, Pos
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        NEWFEATURED
        Location: Manchester (Hybrid - 2-3 days in the office) Type: Permanent - Salary: £80,000 - £90,000 + Benefits - Eligibility: Must be UK-based. Unfortunately, sponsorship is not available. Are you an experienced Node.js Developer with a passion for building scalable, cloud-based applications? Our client, a fast-growing SaaS company in Manchester, is seeking a Senior / Lead Node.js Developer to join their engineering team and play a key role in shaping their product roadmap. What You'll Do * Lead the design and development of high-quality, scalable backend solutions using Node.js and TypeScript * Mentor and support other developers, driving best practices and technical excellence * Work in a modern cloud environment with GCP / AWS / Azure services * Contribute to DevOps adoption, CI/CD pipelines, and containerisation with Docker
        Location: Manchester (Hybrid - 2-3 days in the office) Type: Permanent - Salary: £80,000 - £90,000 + Benefits - Eligibility: Must be UK-based. Unfortunately, sponsorship is not available. Are you an experienced Node.js Developer with a passion for building scalable, cloud-based applications? Our client, a fast-growing SaaS company in Manchester, is seeking a Senior / Lead Node.js Developer to join their engineering team and play a key role in shaping their product roadmap. What You'll Do * Lead the design and development of high-quality, scalable backend solutions using Node.js and TypeScript * Mentor and support other developers, driving best practices and technical excellence * Work in a modern cloud environment with GCP / AWS / Azure services * Contribute to DevOps adoption, CI/CD pipelines, and containerisation with Docker
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        Code quality and API-First principles are at the heart of all our development. * Deliver high efficiency, high availability, concurrent and fault tolerant software systems using API-First principles. * An interest in setting strategy and direction, backed by real-work experience, ideally in an API-First setting. * Experience designing, building, and deploying scalable micro-services using API-First principles using at least one of REST/gRPC. * Strong understanding of RESTful API design principles and best practices. * Experience with API authentication and authorization mechanisms (e.g., OAuth, JWT). * Experience with API gateway technologies (e.g., Apigee, Kong) is beneficial.
        Code quality and API-First principles are at the heart of all our development. * Deliver high efficiency, high availability, concurrent and fault tolerant software systems using API-First principles. * An interest in setting strategy and direction, backed by real-work experience, ideally in an API-First setting. * Experience designing, building, and deploying scalable micro-services using API-First principles using at least one of REST/gRPC. * Strong understanding of RESTful API design principles and best practices. * Experience with API authentication and authorization mechanisms (e.g., OAuth, JWT). * Experience with API gateway technologies (e.g., Apigee, Kong) is beneficial.
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        NEW

        Global Claims, IT Solutions Leader

        MARSH CORPORATE SERVICES LIMITED
        The City, EC3R 5BU
        Discretionary Bonus, Pension Scheme & Private Healthcare
        Being a cross-functional collaborator interfacing with MMC Enterprise Technology partners, Marsh-Operations, and Transformation Office will come naturally to you building a new set of reusable IT Microservices connected via a well-defined API structure.
        Being a cross-functional collaborator interfacing with MMC Enterprise Technology partners, Marsh-Operations, and Transformation Office will come naturally to you building a new set of reusable IT Microservices connected via a well-defined API structure.
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        NEWPREMIUM
        Performing automation and API testing when required. * API automation testing using JavaScript * Experience in API and integration testing
        Performing automation and API testing when required. * API automation testing using JavaScript * Experience in API and integration testing
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        NEW

        Student Systems Developer

        London School of Science & Technology Ltd T/a LSST
        Park Royal, W3 0XA
        Unspecified
        Authentication & Integration Services API integrations, SSO (Single Sign-On), and system interoperability with University IT infrastructure.
        Authentication & Integration Services API integrations, SSO (Single Sign-On), and system interoperability with University IT infrastructure.
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        You'll drive key capabilities like multi-tenancy, RBAC, and API experiences to meet the needs of our largest enterprise customers and MSSP partners. As a Lead Product Manager, your primary responsibility will be to own critical enterprise capabilities including multi-tenancy experiences, user access management (RBAC and data access control), API experiences, and foundational account infrastructure. * Strong understanding of enterprise platform requirements, particularly in multi-tenant environments, role-based access control (RBAC), identity and access management (IAM), and API development.
        You'll drive key capabilities like multi-tenancy, RBAC, and API experiences to meet the needs of our largest enterprise customers and MSSP partners. As a Lead Product Manager, your primary responsibility will be to own critical enterprise capabilities including multi-tenancy experiences, user access management (RBAC and data access control), API experiences, and foundational account infrastructure. * Strong understanding of enterprise platform requirements, particularly in multi-tenant environments, role-based access control (RBAC), identity and access management (IAM), and API development.
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        NEW

        Senior Software Engineer - Pensions, ISA and Investments

        Hargreaves Lansdown
        BS1, Bristol
        £65000 - £80000 per annum + generous bonus, pension and more
        Understanding of Microservices & principles of RESTful API development, including structuring, documenting, versioning, testing and stubbing/mocking.
        Understanding of Microservices & principles of RESTful API development, including structuring, documenting, versioning, testing and stubbing/mocking.
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        NEWFEATURED

        HR & Payroll Systems Developer - ResourceLink, Compensate.

        Solus Accident Repair Centres
        S10, Sheffield
        From £45,000 to £55,000 per annum + bonus and benefits
        A keen understanding of security and of integrations with other platforms through the use of APIs, webhooks, SSO and Azure connectors; a proficiency in using the ZIP API suite
        A keen understanding of security and of integrations with other platforms through the use of APIs, webhooks, SSO and Azure connectors; a proficiency in using the ZIP API suite
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        NEW

        Data Platform Lead

        Pertemps Thames Water
        Reading, Berkshire
        Up to £100,000 per annum depending on experience.
        Wide range of strong platform support and technical skills. (i.e. Azure DevOps, API creation, PowerShell, Python, SQL)
        Wide range of strong platform support and technical skills. (i.e. Azure DevOps, API creation, PowerShell, Python, SQL)
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        NEWFEATURED
        Extensive Salesforce development experience (including Apex triggers, classes, asynchronous Apex, API Integrations, Platform Events, LWCs and Sites)
        Extensive Salesforce development experience (including Apex triggers, classes, asynchronous Apex, API Integrations, Platform Events, LWCs and Sites)
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        NEW

        Data Integration Developer

        Gregory Distribution
        Cullompton, Devon, EX15 1BS
        £38000 - £42000 per annum + Please see benefits.
        Extract and ingest data using multiple methods, including structured database queries, API Calls, and the processing of flat files across various formats, ensuring data integrity and consistency. * Familiarity with cloud-based data integration and management tools such as Azure Logic Apps, API Management, or similar platforms.
        Extract and ingest data using multiple methods, including structured database queries, API Calls, and the processing of flat files across various formats, ensuring data integrity and consistency. * Familiarity with cloud-based data integration and management tools such as Azure Logic Apps, API Management, or similar platforms.
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        NEWFEATURED

        Senior Software Engineer

        AJ BELL BUSINESS SOLUTIONS LIMITED
        Salford Quays, M5 3EE
        From £70,000 to £80,000 per annum Competitive plus bonus and benefits
        Experience/Familiarity with communications technologies (Web API, Google Protocol Buffers) and message queues (e.g. RabbitMQ, SQS)
        Experience/Familiarity with communications technologies (Web API, Google Protocol Buffers) and message queues (e.g. RabbitMQ, SQS)
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        NEWFEATURED

        BI Developer

        Conferma Ltd
        North West
        From £45,000 to £50,000 per annum
        Experience of using Power Query to extract, transform and load data from a variety of sources into Power BI and Excel e.g. Microsoft Fabric, SQL Server, Excel, API
        Experience of using Power Query to extract, transform and load data from a variety of sources into Power BI and Excel e.g. Microsoft Fabric, SQL Server, Excel, API
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        NEWPREMIUM

        Solution Architect

        Stott & May Professional Search Limited
        NN1, Northampton
        £415 - £467.50 per day
        Role Title: Banking Solution Architect - Location: Knutsford or Northampton - Duration: Until 31/12/2025 - Day Rate: £467.50 Inside IR35 - We are seeking an experienced Solution Architect to provide technical leadership across core banking programmes, focusing on current account journeys, including loans, account switching, and related operational platforms. The successful candidate will be responsible for designing, developing, and implementing scalable, resilient, and secure technology solutions to address complex business challenges within the banking landscape. This role requires close collaboration with stakeholders across business and technology functions, ownership of architectural delivery, and guidance on integration strategies, balancing cloud adoption, automation, and regulatory compliance. Lead the design and technical architecture for current accounts, lo
        Role Title: Banking Solution Architect - Location: Knutsford or Northampton - Duration: Until 31/12/2025 - Day Rate: £467.50 Inside IR35 - We are seeking an experienced Solution Architect to provide technical leadership across core banking programmes, focusing on current account journeys, including loans, account switching, and related operational platforms. The successful candidate will be responsible for designing, developing, and implementing scalable, resilient, and secure technology solutions to address complex business challenges within the banking landscape. This role requires close collaboration with stakeholders across business and technology functions, ownership of architectural delivery, and guidance on integration strategies, balancing cloud adoption, automation, and regulatory compliance. Lead the design and technical architecture for current accounts, lo
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        NEW
        Solution Architect - Contract Opportunity - We're hiring a Solution Architect to support a major platform transformation programme focused on pension products. This role involves working closely with the IT teams and internal stakeholders to design and deliver an integrated administration platform. Key Details * Location: Hybrid - Leeds (2 days/week on-site) * Rate: £500-£600 per day (Outside IR35) * Contract Length: 6 months (likely extension) * Start Date: ASAP * Working Arrangements: Hybrid (2-3 days on site) Role Summary - You'll be responsible for defining solution architectures, guiding implementation, and ensuring alignment with business and technical goals. The role requires strong collaboration with internal teams and external vendors, with a focus on cloud-native design, integration, and enterprise governance. Skills & Experience Required
        Solution Architect - Contract Opportunity - We're hiring a Solution Architect to support a major platform transformation programme focused on pension products. This role involves working closely with the IT teams and internal stakeholders to design and deliver an integrated administration platform. Key Details * Location: Hybrid - Leeds (2 days/week on-site) * Rate: £500-£600 per day (Outside IR35) * Contract Length: 6 months (likely extension) * Start Date: ASAP * Working Arrangements: Hybrid (2-3 days on site) Role Summary - You'll be responsible for defining solution architectures, guiding implementation, and ensuring alignment with business and technical goals. The role requires strong collaboration with internal teams and external vendors, with a focus on cloud-native design, integration, and enterprise governance. Skills & Experience Required
        more
        NEW

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        What is the average salary for API in UK?

        Average salary per year
        £57,499

        The average salary for a API in UK is £57,499. API in UK salaries range from £47,499 to £77,499.

        Frequently Asked Questions

        How many contract API jobs are there in UK?
        There are 1,331 contract API jobs within 20 miles of UK available on CWJobs right now.

        Where in UK are these contract jobs?
        You can find contract jobs in South East, North West, Midlands.

        What other similar jobs are there to contract API jobs in UK?
        As well as contract API jobs in UK, you can find contract IT, Software Development, Testing, amongst many others.