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        493 Contract API jobs in London + 20 miles

        292 exact matches jobs are outside your preferred location

        Senior DevOps Engineer

        Ultromics
        Oxford, Oxfordshire
        Competitive
        About Ultromics - Picture yourself at one of the world's most innovative companies, providing life-saving AI solutions that can make a real difference in helping to combat one of the world's biggest health burdens. Surrounded by teams and people who challenge you, support you, and inspire you to be extraordinary. Are you ready to join the fight against heart failure? We are redefining Cardiovascular Medicine through transformational AI solutions and work alongside major collaborations such as Mayo Clinic and the NHS England, with one shared ambition, to save lives. Ultromics is a global leader in AI-powered cardiovascular imaging diagnostics, transforming how heart disease is detected, assessed, and managed. Spun out from the University of Oxford, UK and built on a decade of world-leading research, Ultromics is redefining echocardiography with solutions that deliver .
        About Ultromics - Picture yourself at one of the world's most innovative companies, providing life-saving AI solutions that can make a real difference in helping to combat one of the world's biggest health burdens. Surrounded by teams and people who challenge you, support you, and inspire you to be extraordinary. Are you ready to join the fight against heart failure? We are redefining Cardiovascular Medicine through transformational AI solutions and work alongside major collaborations such as Mayo Clinic and the NHS England, with one shared ambition, to save lives. Ultromics is a global leader in AI-powered cardiovascular imaging diagnostics, transforming how heart disease is detected, assessed, and managed. Spun out from the University of Oxford, UK and built on a decade of world-leading research, Ultromics is redefining echocardiography with solutions that deliver .
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        Graduate/Junior Web Developer Location: Head Office, The Stables, Chorley, PR7 4AT - A Glimpse into the Role awaiting You - At Glendale we are developing state-of-the-art technology leveraging the use of Google Cloud Platform. Combining, optimising and integrating various Google Cloud services such as Google App Engine, Google Cloud SQL, Google Compute Engine, Google Cloud Storage we have developed multiple solutions to assist all aspects of our business. We are looking for a Graduate / Junior developer to join our team based in our Head Office in Chorley, with the opportunity for hybrid / remote working. This position is a varied role supporting the business in continuously improving efficiency, productivity and safety through the implementation and optimisation of in-house software solutions. We're looking for a graduate or someone who has some programming experienc
        Graduate/Junior Web Developer Location: Head Office, The Stables, Chorley, PR7 4AT - A Glimpse into the Role awaiting You - At Glendale we are developing state-of-the-art technology leveraging the use of Google Cloud Platform. Combining, optimising and integrating various Google Cloud services such as Google App Engine, Google Cloud SQL, Google Compute Engine, Google Cloud Storage we have developed multiple solutions to assist all aspects of our business. We are looking for a Graduate / Junior developer to join our team based in our Head Office in Chorley, with the opportunity for hybrid / remote working. This position is a varied role supporting the business in continuously improving efficiency, productivity and safety through the implementation and optimisation of in-house software solutions. We're looking for a graduate or someone who has some programming experienc
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        Why Babble? Babble is a Customer Experience-led growth business. As the ultimate Trusted Advisor for cloud-based technologies, we specialize in empowering businesses with the best solutions from the world's leading providers. * Microsoft Modern Work * Cybersecurity * Contact Centre Technology * Mobile Solutions * Communications & Connectivity - With nearly 15,000 customers, we're just scratching the surface of our potential. Many of our clients currently benefit from one or two of our technologies, presenting an incredible opportunity to introduce them to our full suite of market-leading solutions. Join us on this exciting journey and let's achieve greatness together! Job Description - Join Our Dynamic Team as a Key Accounts - Contact Centre as a Service Support Engineer! Are you passionate about telecoms? Do you thrive in a fast-paced, innovative environment?
        Why Babble? Babble is a Customer Experience-led growth business. As the ultimate Trusted Advisor for cloud-based technologies, we specialize in empowering businesses with the best solutions from the world's leading providers. * Microsoft Modern Work * Cybersecurity * Contact Centre Technology * Mobile Solutions * Communications & Connectivity - With nearly 15,000 customers, we're just scratching the surface of our potential. Many of our clients currently benefit from one or two of our technologies, presenting an incredible opportunity to introduce them to our full suite of market-leading solutions. Join us on this exciting journey and let's achieve greatness together! Job Description - Join Our Dynamic Team as a Key Accounts - Contact Centre as a Service Support Engineer! Are you passionate about telecoms? Do you thrive in a fast-paced, innovative environment?
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        Company Description - Why Babble? Babble is a Customer Experience-led growth business. As the ultimate Trusted Advisor for cloud-based technologies, we specialize in empowering businesses with the best solutions from the world's leading providers. * Microsoft Modern Work * Cybersecurity * Contact Centre Technology * Mobile Solutions * Communications & Connectivity - With nearly 15,000 customers, we're just scratching the surface of our potential. Many of our clients currently benefit from one or two of our technologies, presenting an incredible opportunity to introduce them to our full suite of market-leading solutions. Join us on this exciting journey and let's achieve greatness together! About Us | Leading UK Cloud Solutions Provider | Babble - Job Description - Join Our Dynamic Team as a Key Accounts - Contact Centre as a Service Support Engineer! Are you passionat
        Company Description - Why Babble? Babble is a Customer Experience-led growth business. As the ultimate Trusted Advisor for cloud-based technologies, we specialize in empowering businesses with the best solutions from the world's leading providers. * Microsoft Modern Work * Cybersecurity * Contact Centre Technology * Mobile Solutions * Communications & Connectivity - With nearly 15,000 customers, we're just scratching the surface of our potential. Many of our clients currently benefit from one or two of our technologies, presenting an incredible opportunity to introduce them to our full suite of market-leading solutions. Join us on this exciting journey and let's achieve greatness together! About Us | Leading UK Cloud Solutions Provider | Babble - Job Description - Join Our Dynamic Team as a Key Accounts - Contact Centre as a Service Support Engineer! Are you passionat
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        Software Engineer

        Gigaclear Ltd
        Abingdon, Oxfordshire
        £45,000 - £55,000 a year
        A Full Stack Software Engineering role. A role that will build your technical capabilities, providing a foundation for growth into more senior technical leadership roles. The Software Engineer is a hands-on contributor responsible for delivering secure, maintainable, and performant software as part of a cross-functional Agile team. Working closely with Product, QA, DevOps, and fellow engineers, this role helps shape technical solutions and contributes to quality practices. Essential Skills & Experience * Strong Python Development Capability 3 years+ * Experienced with front-end frameworks (React.js and Next.js) * Experience with TypeScript * Experience implementing and integrating with REST APIs * SQL experience (preferably PostgreSQL and/or MySQL) * Experience with responsive web design * Understanding of SEO strategies and security standards
        A Full Stack Software Engineering role. A role that will build your technical capabilities, providing a foundation for growth into more senior technical leadership roles. The Software Engineer is a hands-on contributor responsible for delivering secure, maintainable, and performant software as part of a cross-functional Agile team. Working closely with Product, QA, DevOps, and fellow engineers, this role helps shape technical solutions and contributes to quality practices. Essential Skills & Experience * Strong Python Development Capability 3 years+ * Experienced with front-end frameworks (React.js and Next.js) * Experience with TypeScript * Experience implementing and integrating with REST APIs * SQL experience (preferably PostgreSQL and/or MySQL) * Experience with responsive web design * Understanding of SEO strategies and security standards
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        Senior Software Engineer

        Gigaclear Ltd
        Abingdon, Oxfordshire
        £55,000 - £60,000 a year
        A role to put your Software Engineering problem solving skills to the test, translating complex technical concepts to cross-functional audiences. You will play a key role in delivering robust, secure, and scalable software systems. Working closely with Product, QA, and DevOps, you will balance hands-on development with architectural contribution, promote Agile best practices, and help raise the engineering bar through coaching, code quality, and continuous improvement initiatives. You will support the teams technical evolution while ensuring reliable product delivery aligned to business needs. * Strong Python Development Capability 5 years+ * Experience implementing and integrating with REST APIs * SQL experience (preferably PostgreSQL and/or MySQL) * Passionate about building quality software * Experience of developing in Rust.
        A role to put your Software Engineering problem solving skills to the test, translating complex technical concepts to cross-functional audiences. You will play a key role in delivering robust, secure, and scalable software systems. Working closely with Product, QA, and DevOps, you will balance hands-on development with architectural contribution, promote Agile best practices, and help raise the engineering bar through coaching, code quality, and continuous improvement initiatives. You will support the teams technical evolution while ensuring reliable product delivery aligned to business needs. * Strong Python Development Capability 5 years+ * Experience implementing and integrating with REST APIs * SQL experience (preferably PostgreSQL and/or MySQL) * Passionate about building quality software * Experience of developing in Rust.
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        Job Summary - IQGeo is seeking a Senior Full Stack Software Engineer to enhance our Developer Experience and Developer Tools for our Web and Mobile Software engineering efforts, supporting both domestic and international enterprise customers. This role joins a dynamic team that enjoys working with complex applications and products that utilize software, GIS, engineering, and problem-solving skills. Our flexible scheduling and outstanding benefits support success in a highly creative, innovative, and energetic company. About Us - Achieving universal broadband equity and meeting net zero carbon emissions are two of the biggest social and environmental challenges that the IQGeo team is tackling. To achieve this, more than 500 innovative telecommunications and utility companies around the world are building better networks using our award-winning geospatial software to de
        Job Summary - IQGeo is seeking a Senior Full Stack Software Engineer to enhance our Developer Experience and Developer Tools for our Web and Mobile Software engineering efforts, supporting both domestic and international enterprise customers. This role joins a dynamic team that enjoys working with complex applications and products that utilize software, GIS, engineering, and problem-solving skills. Our flexible scheduling and outstanding benefits support success in a highly creative, innovative, and energetic company. About Us - Achieving universal broadband equity and meeting net zero carbon emissions are two of the biggest social and environmental challenges that the IQGeo team is tackling. To achieve this, more than 500 innovative telecommunications and utility companies around the world are building better networks using our award-winning geospatial software to de
        more
        Job Description Summary - Join us at GE Vernova Grid Software to be part of the team leading the digital transformation of the energy market. As the worlds energy sector moves away from fossil fuels toward renewable energy sources, industrial companies are challenged with addressing this transition in transformative ways. Digitization will be key to making power-generating assets more efficient and the electric grid more secure and resilient. Our Geospatial products play a critical role in this transformation by supporting the design, modelling and maintenance of electric, gas and telecommunication networks. For more information on our strategy, check out GridOS overview : will be a part of our Grid Software Engineering team, an Agile organization with a flexible working environment, where we are always looking to innovate our products and the processes and technologi
        Job Description Summary - Join us at GE Vernova Grid Software to be part of the team leading the digital transformation of the energy market. As the worlds energy sector moves away from fossil fuels toward renewable energy sources, industrial companies are challenged with addressing this transition in transformative ways. Digitization will be key to making power-generating assets more efficient and the electric grid more secure and resilient. Our Geospatial products play a critical role in this transformation by supporting the design, modelling and maintenance of electric, gas and telecommunication networks. For more information on our strategy, check out GridOS overview : will be a part of our Grid Software Engineering team, an Agile organization with a flexible working environment, where we are always looking to innovate our products and the processes and technologi
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        2+ years of in a few of the areas: serverless architecture, event-driven architecture, microservices, API-driven cloud-based products including performance management.
        2+ years of in a few of the areas: serverless architecture, event-driven architecture, microservices, API-driven cloud-based products including performance management.
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        NEW
        2+ years of in a few of the areas: serverless architecture, event-driven architecture, microservices, API-driven cloud-based products including performance management.
        2+ years of in a few of the areas: serverless architecture, event-driven architecture, microservices, API-driven cloud-based products including performance management.
        more
        Mastercard Developers ( is the primary API platform for Mastercard partners to access a diverse range of payment, data, loyalty, and security APIs. The team is responsible for delivering an experience that ensures developers can quickly find the right API, assess its technical capabilities and integrate it into new and innovative solutions. Act as subject matter expert for Mastercard Developers API Platform and services to support customer integrations on occasion - Proven track record in API based products
        Mastercard Developers ( is the primary API platform for Mastercard partners to access a diverse range of payment, data, loyalty, and security APIs. The team is responsible for delivering an experience that ensures developers can quickly find the right API, assess its technical capabilities and integrate it into new and innovative solutions. Act as subject matter expert for Mastercard Developers API Platform and services to support customer integrations on occasion - Proven track record in API based products
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        NEW

        Cloud Architect

        Anson Mccade
        South East
        GBP 85,000.00 per year;GBP 110,000.00 per year
        ££85,000 - £110,000 GBP - Onsite WORKING - Location: Central London, Greater London - United Kingdom Type: Permanent - Level: Senior / Lead Architect - £85,000 - £110,000 - Locations: London | Hybrid | Remote flexibility - Function: Cloud Architecture | DevSecOps | Digital Infrastructure - Industry: Enterprise Technology Services - Lead cloud innovation that transforms enterprise-scale operations. A global leader in mission-critical technology infrastructure is seeking an experienced Cloud Architect to design and deliver next-generation cloud and hybrid environments. This organisation helps Fortune 500 businesses modernise their IT foundations, enabling scalability, agility, and long-term resilience. About the Role - As a Cloud Architect, you'll play a pivotal role in the architecture and implementation of complex cloud solutions.
        ££85,000 - £110,000 GBP - Onsite WORKING - Location: Central London, Greater London - United Kingdom Type: Permanent - Level: Senior / Lead Architect - £85,000 - £110,000 - Locations: London | Hybrid | Remote flexibility - Function: Cloud Architecture | DevSecOps | Digital Infrastructure - Industry: Enterprise Technology Services - Lead cloud innovation that transforms enterprise-scale operations. A global leader in mission-critical technology infrastructure is seeking an experienced Cloud Architect to design and deliver next-generation cloud and hybrid environments. This organisation helps Fortune 500 businesses modernise their IT foundations, enabling scalability, agility, and long-term resilience. About the Role - As a Cloud Architect, you'll play a pivotal role in the architecture and implementation of complex cloud solutions.
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        PREMIUM
        Experience working with software systems including querying, SQL scripting, and working with API development * Technical understanding of Meta advertising products (including Ads and Pages API, Identity Platform) * Experience working with API documents, calling APIs using scripts, and testing APIs
        Experience working with software systems including querying, SQL scripting, and working with API development * Technical understanding of Meta advertising products (including Ads and Pages API, Identity Platform) * Experience working with API documents, calling APIs using scripts, and testing APIs
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        Strong knowledge of AWS services (Lambda, SNS, S3, EKS, API Gateway) * Experience with API/interface modelling and CI/CD (e.g. GitHub Actions)
        Strong knowledge of AWS services (Lambda, SNS, S3, EKS, API Gateway) * Experience with API/interface modelling and CI/CD (e.g. GitHub Actions)
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        PREMIUM
        Excellent skills in designing and delivering integrations using Microsoft Azure PaaS (Functions, Logic Apps, API Management, Service Bus,) * Expertise in integration strategy, API management, and canonical data models.
        Excellent skills in designing and delivering integrations using Microsoft Azure PaaS (Functions, Logic Apps, API Management, Service Bus,) * Expertise in integration strategy, API management, and canonical data models.
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        The ideal candidate will have proven experience with Node.js and/or Java (v21+) for backend development, as well as a strong knowledge of microservices architecture and RESTful API design. - Familiarity with API Gateway platforms such as WSO2 or similar.
        The ideal candidate will have proven experience with Node.js and/or Java (v21+) for backend development, as well as a strong knowledge of microservices architecture and RESTful API design. - Familiarity with API Gateway platforms such as WSO2 or similar.
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        What is the average salary for API in London?

        Average salary per year
        £72,499

        The average salary for a API in London is £72,499. API in London salaries range from £62,499 to £87,499.

        Frequently Asked Questions

        How many contract API jobs are there in London?
        There are 493 contract API jobs within 20 miles of London available on CWJobs right now.

        Where in London are these contract jobs?
        You can find contract jobs in City of London, Central London, West End.

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