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        See all jobs in Clerkenwell

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        Last 14 days
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        • London
        • City of London

        61 Contract API jobs in Clerkenwell + 20 miles

        Senior JavaScript Engineer Vue.js API

        Client Server
        W6, West London, W6 0LG
        £85000 - £100000 per annum
        Senior JavaScript Engineer / Developer (Vue.js API) London to £100k Do you have expertise with JavaScript? You could be progressing your career in a senior, hands-on Senior JavaScript Engineer role at a scale-up tech company, that enables smart matching for commercial van drivers and consumers, via job bidding and route optimisation, streamlining processes and delivering CO2 carbon neutral targets, the company has been established 10 years, with recent funding of £125 million. You'll be working on complex and interesting systems and can enjoy a range of benefits and perks. As a Senior JavaScript Engineer you'll collaborate as part of an Agile technology team to design and develop, troubleshoot and solve complex software issues to help scale and future proof the business.
        Senior JavaScript Engineer / Developer (Vue.js API) London to £100k Do you have expertise with JavaScript? You could be progressing your career in a senior, hands-on Senior JavaScript Engineer role at a scale-up tech company, that enables smart matching for commercial van drivers and consumers, via job bidding and route optimisation, streamlining processes and delivering CO2 carbon neutral targets, the company has been established 10 years, with recent funding of £125 million. You'll be working on complex and interesting systems and can enjoy a range of benefits and perks. As a Senior JavaScript Engineer you'll collaborate as part of an Agile technology team to design and develop, troubleshoot and solve complex software issues to help scale and future proof the business.
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        NEWPREMIUM

        Axway API Developer

        Randstad Digital
        EC1, City of London
        £500 - £650 per day
        6 months contract Inside IR35?? £500 to £650 a day?? Remote Working (UK based) *Active SC Clearance is needed* A top-tier defense organization is looking for an experienced Axway API Developer / Administrator to join their team on a 6-month contract. You will contribute to a large government gateway project, and active SC clearance is required. The main focus of this role is to design and develop Axway policies while maintaining automated testing and code deployment. You will also be responsible for liaising with stakeholders to define requirements and design comprehensive solutions. * Axway's core products: Policy Studio, API Gateway, and API Manager. * Key communication protocols: SFTP, HTTPS, SSL/TLS, and oAuth. * Data and messaging formats: JSON, XML, SOAP, and REST. * Linux scripting and environments. * Using DevOps toolsets to automate testing and deployments.
        6 months contract Inside IR35?? £500 to £650 a day?? Remote Working (UK based) *Active SC Clearance is needed* A top-tier defense organization is looking for an experienced Axway API Developer / Administrator to join their team on a 6-month contract. You will contribute to a large government gateway project, and active SC clearance is required. The main focus of this role is to design and develop Axway policies while maintaining automated testing and code deployment. You will also be responsible for liaising with stakeholders to define requirements and design comprehensive solutions. * Axway's core products: Policy Studio, API Gateway, and API Manager. * Key communication protocols: SFTP, HTTPS, SSL/TLS, and oAuth. * Data and messaging formats: JSON, XML, SOAP, and REST. * Linux scripting and environments. * Using DevOps toolsets to automate testing and deployments.
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        NEWFEATURED
        Backend Software Engineer / Developer (Java Kotlin AWS API) Hybrid WFH to £110k Would you like to progress your career in an impactful hands-on Backend Software Engineer role working on Tech for Good? You could be joining a HealthTech Start-up, founded by two highly successful, Cambridge University educated management consultants, that is aiming to improve patient and social care for all by using complex technology to improve access to patient records, enabling collaboration between healthcare providers and improving nursing and medical care. As a Backend Software Engineer you will collaborate with the CTO on the overall design and architecture of the products' tech stack, working on Greenfield applications. The tech stack is based on Kotlin, SpringBoot and AWS backend with TypeScript, React and Next.js on the front end.
        Backend Software Engineer / Developer (Java Kotlin AWS API) Hybrid WFH to £110k Would you like to progress your career in an impactful hands-on Backend Software Engineer role working on Tech for Good? You could be joining a HealthTech Start-up, founded by two highly successful, Cambridge University educated management consultants, that is aiming to improve patient and social care for all by using complex technology to improve access to patient records, enabling collaboration between healthcare providers and improving nursing and medical care. As a Backend Software Engineer you will collaborate with the CTO on the overall design and architecture of the products' tech stack, working on Greenfield applications. The tech stack is based on Kotlin, SpringBoot and AWS backend with TypeScript, React and Next.js on the front end.
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        NEWPREMIUM

        Mulesoft Technical Lead

        LA International Computer Consultants Ltd
        Lambeth, SE1 7ND
        £700 - £765 per day
        Required: Mulesoft Technical Lead Location: Remote Duration: 12 month initial contract IR35 Status: Inside Working with the Project Manager, architects, clients & other stakeholders to implement MuleSoft APIs. This role will require knowledge of MuleSoft's Anypoint Studio & Anypoint Platform, which includes Design Center, Runtime Manager, API Manager, Exchange, etc. You must be capable of understanding business requirements, working with stakeholders & implementing complex integrations. Responsibilities: Designing & developing integration solutions using MuleSoft Anypoint Platform. Building & maintaining integration flows using MuleSoft's Anypoint Studio. Creating & implementing custom connectors and modules. Collaborating with other developers & stakeholders to understand business requirements & translate them into integration solutions.
        Required: Mulesoft Technical Lead Location: Remote Duration: 12 month initial contract IR35 Status: Inside Working with the Project Manager, architects, clients & other stakeholders to implement MuleSoft APIs. This role will require knowledge of MuleSoft's Anypoint Studio & Anypoint Platform, which includes Design Center, Runtime Manager, API Manager, Exchange, etc. You must be capable of understanding business requirements, working with stakeholders & implementing complex integrations. Responsibilities: Designing & developing integration solutions using MuleSoft Anypoint Platform. Building & maintaining integration flows using MuleSoft's Anypoint Studio. Creating & implementing custom connectors and modules. Collaborating with other developers & stakeholders to understand business requirements & translate them into integration solutions.
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        NEW
        Digital Transformation Manager - Low Code Development and Data Engineering - Full time permanent role - Hybrid (West London 3 days a week) - Salary up to £70,000 plus 25 days holiday and travel paid A successful West London business is currently looking for an experienced Digital Transformation Manager to join its IT function. This exciting new role will focus on the design and development of low code applications as well as data warehouses/pipelines. - Leading on the design and implementation of low-code applications across the Microsoft Power Platform - Improving efficiency through automating solutions - Driving AI strategy - Oversee system enhancements and API integrations - Oversee data engineering process - ETL/ELT pipelines with Azure Data Factory - Drive development of Snowflake Data Warehouse - Team management and leading Data Engineers/Developers
        Digital Transformation Manager - Low Code Development and Data Engineering - Full time permanent role - Hybrid (West London 3 days a week) - Salary up to £70,000 plus 25 days holiday and travel paid A successful West London business is currently looking for an experienced Digital Transformation Manager to join its IT function. This exciting new role will focus on the design and development of low code applications as well as data warehouses/pipelines. - Leading on the design and implementation of low-code applications across the Microsoft Power Platform - Improving efficiency through automating solutions - Driving AI strategy - Oversee system enhancements and API integrations - Oversee data engineering process - ETL/ELT pipelines with Azure Data Factory - Drive development of Snowflake Data Warehouse - Team management and leading Data Engineers/Developers
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        NEWFEATURED
        Job Title: Web Solutions Engineer/Full Stack Engineer Location: Address: 1-13 St Giles High St, London WC2H 8AG Mode of working: Hybrid (3 Days in the Office) Duration: 6+ Months contract initially As a Web Solutions Engineer (WSE) you are responsible for building, designing, and deploying scalable, modern, web applications. You deliver full pieces of functionality on moderately complex projects with minimal assistance. You architect high quality web applications, and design key tools and systems that support said web applications. * Write and review code in JavaScript or TypeScript, Java, Kotlin, Golang, and/or SQL * Test, debug, maintain and/or update full-stack web applications. * Write and review technical documents, including design, development, and revision documents. * Collaborate with Product, UX, QA, and engineering teams, to deliver new features
        Job Title: Web Solutions Engineer/Full Stack Engineer Location: Address: 1-13 St Giles High St, London WC2H 8AG Mode of working: Hybrid (3 Days in the Office) Duration: 6+ Months contract initially As a Web Solutions Engineer (WSE) you are responsible for building, designing, and deploying scalable, modern, web applications. You deliver full pieces of functionality on moderately complex projects with minimal assistance. You architect high quality web applications, and design key tools and systems that support said web applications. * Write and review code in JavaScript or TypeScript, Java, Kotlin, Golang, and/or SQL * Test, debug, maintain and/or update full-stack web applications. * Write and review technical documents, including design, development, and revision documents. * Collaborate with Product, UX, QA, and engineering teams, to deliver new features
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        Senior React Developer / Front End Engineer (React TypeScript Data Visualisation) London to £80k Are you a skilled Software Developer with strong React and Data Visualisation skills combined with a good appreciation of financial markets and technology? You could be joining a growing, global, Fintech services company that has seen 30-40% year on year growth for the past 10 years and has ambitious growth plans. As a Senior React Developer you'll design and develop new features and enhancements to the front end of the platform with a focus on real-time data visualisation on business critical systems using React. You'll collaborate with backend engineers to build complex financial products. You'll join the team in Central London three days a week with flexibility to work from home the other two days.
        Senior React Developer / Front End Engineer (React TypeScript Data Visualisation) London to £80k Are you a skilled Software Developer with strong React and Data Visualisation skills combined with a good appreciation of financial markets and technology? You could be joining a growing, global, Fintech services company that has seen 30-40% year on year growth for the past 10 years and has ambitious growth plans. As a Senior React Developer you'll design and develop new features and enhancements to the front end of the platform with a focus on real-time data visualisation on business critical systems using React. You'll collaborate with backend engineers to build complex financial products. You'll join the team in Central London three days a week with flexibility to work from home the other two days.
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        NEWPREMIUM

        Senior Software Engineer

        Spectrum It Recruitment Limited
        TW18, Staines
        £70000 - £75000 per annum
        Hybrid working - three days per week in the office. The Senior Software Engineer will focus on developing and maintaining SDKs for for four key products spanning JavaScript (TypeScript), Roku (BrightScript), Android (Java) and iOS (Objective-C). The Senior Software Engineer will be the 'code owner' for JavaScript and Roku SDKs. Key Responsibilities * Being 'code owner' for JavaScript and Roku SDKs * Analysing and defining new requirements * Maintaining and improving CI/CD * Ensuring feature parity and API alignment between different platforms * SDK improvements where possible * Helping define software development practices, policies & tooling Key Experience * Strong JavaScript knowledge * Commercial experience with Java and/or Objective-C * Version control and other core software engineering skills
        Hybrid working - three days per week in the office. The Senior Software Engineer will focus on developing and maintaining SDKs for for four key products spanning JavaScript (TypeScript), Roku (BrightScript), Android (Java) and iOS (Objective-C). The Senior Software Engineer will be the 'code owner' for JavaScript and Roku SDKs. Key Responsibilities * Being 'code owner' for JavaScript and Roku SDKs * Analysing and defining new requirements * Maintaining and improving CI/CD * Ensuring feature parity and API alignment between different platforms * SDK improvements where possible * Helping define software development practices, policies & tooling Key Experience * Strong JavaScript knowledge * Commercial experience with Java and/or Objective-C * Version control and other core software engineering skills
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        NEW
        Fullstack Engineer (Vue. Js & .Net) London hybrid working 2 days per week - Contract Opportunity We are seeking a talented Full Stack Developer with strong skills in Vue.js for front-end development and C# .NET for backend services, along with some knowledge or experience in SQL. You will be designing, building, and maintaining scalable web applications that integrate seamlessly with backend APIs and databases. Minimum Requirements * 5+ years of full stack development experience with Vue, TypeScript and C# .NET. * Strong understanding of Vue 3, Composition API, Pinia. * Proficiency in building RESTful APIs and integrating them with Vue applications. * Knowledge of Vitest (front-end), MSTest or xUnit (.NET) for unit testing and test-driven development practices. * Basic to intermediate SQL skills (queries, stored procedures, indexing).
        Fullstack Engineer (Vue. Js & .Net) London hybrid working 2 days per week - Contract Opportunity We are seeking a talented Full Stack Developer with strong skills in Vue.js for front-end development and C# .NET for backend services, along with some knowledge or experience in SQL. You will be designing, building, and maintaining scalable web applications that integrate seamlessly with backend APIs and databases. Minimum Requirements * 5+ years of full stack development experience with Vue, TypeScript and C# .NET. * Strong understanding of Vue 3, Composition API, Pinia. * Proficiency in building RESTful APIs and integrating them with Vue applications. * Knowledge of Vitest (front-end), MSTest or xUnit (.NET) for unit testing and test-driven development practices. * Basic to intermediate SQL skills (queries, stored procedures, indexing).
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        PREMIUM
        Company Description At The Stepstone Group, we have a simple yet very important mission: The right job for everyone. Using our data, platform, and technology, we create opportunities for jobseekers and companies around the world to find a perfect match in fair and equitable way. With over 20 brands across 30+ countries, we strive for fair and unbiased hiring. Join our team of 4,000+ employees and be part of reshaping the labour market and becoming the worlds leading job platform. Job Description Join our team and youll be responsible for our recommender systems and search algorithms,building the core infrastructure that powers millions of meaningful connections. Working in theSearch & Match domain, you willbe focusing on deploying and scaling machine learning models, particularly large language models (LLMs).
        Company Description At The Stepstone Group, we have a simple yet very important mission: The right job for everyone. Using our data, platform, and technology, we create opportunities for jobseekers and companies around the world to find a perfect match in fair and equitable way. With over 20 brands across 30+ countries, we strive for fair and unbiased hiring. Join our team of 4,000+ employees and be part of reshaping the labour market and becoming the worlds leading job platform. Job Description Join our team and youll be responsible for our recommender systems and search algorithms,building the core infrastructure that powers millions of meaningful connections. Working in theSearch & Match domain, you willbe focusing on deploying and scaling machine learning models, particularly large language models (LLMs).
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        NEW
        Company Description At The Stepstone Group, we have a simple yet very important mission: The right job for everyone. Using our data, platform, and technology, we create opportunities for jobseekers and companies around the world to find a perfect match in fair and equitable way. With over 20 brands across 30+ countries, we strive for fair and unbiased hiring. Join our team of 4,000+ employees and be part of reshaping the labour market and becoming the worlds leading job platform. Job Description Join our team and youll be responsible for our recommender systems and search algorithms,building the core infrastructure that powers millions of meaningful connections. Working in theSearch & Match domain, you willbe focusing on deploying and scaling machine learning models, particularly large language models (LLMs).
        Company Description At The Stepstone Group, we have a simple yet very important mission: The right job for everyone. Using our data, platform, and technology, we create opportunities for jobseekers and companies around the world to find a perfect match in fair and equitable way. With over 20 brands across 30+ countries, we strive for fair and unbiased hiring. Join our team of 4,000+ employees and be part of reshaping the labour market and becoming the worlds leading job platform. Job Description Join our team and youll be responsible for our recommender systems and search algorithms,building the core infrastructure that powers millions of meaningful connections. Working in theSearch & Match domain, you willbe focusing on deploying and scaling machine learning models, particularly large language models (LLMs).
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        PREMIUM
        My client, a leading digital consultancy are currently looking for a highly skilled and experienced Java Tech Lead to join their engineering team. You will be responsible for leading a team of engineers, providing technical guidance, and ensuring successful delivery of scalable, high-performance solutions using Java, Microservices, GCP, and Kubernetes. This is a hands-on leadership role that combines deep technical expertise with team mentorship and delivery ownership. o Lead a team of backend engineers, providing technical direction and mentoring o Drive best practices in coding, architecture, design patterns, and DevOps o Conduct code reviews, provide constructive feedback, and ensure code quality and maintainability
        My client, a leading digital consultancy are currently looking for a highly skilled and experienced Java Tech Lead to join their engineering team. You will be responsible for leading a team of engineers, providing technical guidance, and ensuring successful delivery of scalable, high-performance solutions using Java, Microservices, GCP, and Kubernetes. This is a hands-on leadership role that combines deep technical expertise with team mentorship and delivery ownership. o Lead a team of backend engineers, providing technical direction and mentoring o Drive best practices in coding, architecture, design patterns, and DevOps o Conduct code reviews, provide constructive feedback, and ensure code quality and maintainability
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        Senior Python Engineer

        TEKsystems
        Central London, London
        475.00 - 700.00 GBP/Daily
        5 Days in office Cambridge Our client is seeking a contract software engineer to support and enhance the software and systems used in their data collection lab located in Cambridge, UK. The role involves building software that interfaces with cutting-edge prototype devices and integrating them into a robust data collection platform. Youll collaborate with a multidisciplinary team of audio/video engineers, recording technicians, software engineers, and researchers across locations. The role requires strong communication and teamwork skills to scope, prioritize, and deliver high-quality, maintainable software. * Improve efficiency, reliability, and accuracy of data collection processes. * Work with audio, video, inertial measurement, and other sensor equipment. * Deploy, test, and evaluate updates to distributed data collection systems.
        5 Days in office Cambridge Our client is seeking a contract software engineer to support and enhance the software and systems used in their data collection lab located in Cambridge, UK. The role involves building software that interfaces with cutting-edge prototype devices and integrating them into a robust data collection platform. Youll collaborate with a multidisciplinary team of audio/video engineers, recording technicians, software engineers, and researchers across locations. The role requires strong communication and teamwork skills to scope, prioritize, and deliver high-quality, maintainable software. * Improve efficiency, reliability, and accuracy of data collection processes. * Work with audio, video, inertial measurement, and other sensor equipment. * Deploy, test, and evaluate updates to distributed data collection systems.
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        PREMIUM

        .NET Developer

        Tech 4
        EC1, City of London
        From £60,000 to £70,000 per annum + excellent benefits
        An opportunity has arisen for an experienced Microsoft .Net Software Developer to join this organisation, and contribute to the development of its suite of systems, which are central to how they engage with their clients. Develop business applications for use within the business or by their clients. Provide technical enhancement for existing and new applications The successful candidate will have 3 or more years experience of application development. They will be well versed in structured programming, software testing and database optimisation. The candidate will have proven ability to understand a business requirement or process, and turn it into well written, well tested, documented and maintainable code.
        An opportunity has arisen for an experienced Microsoft .Net Software Developer to join this organisation, and contribute to the development of its suite of systems, which are central to how they engage with their clients. Develop business applications for use within the business or by their clients. Provide technical enhancement for existing and new applications The successful candidate will have 3 or more years experience of application development. They will be well versed in structured programming, software testing and database optimisation. The candidate will have proven ability to understand a business requirement or process, and turn it into well written, well tested, documented and maintainable code.
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        Location:West London (Hybrid 2 days/week on site, hear Heathrow) Contract:6 months initial (extensions highly likely) Start:ASAP Eligibility:UK-based candidates only Rate:Market rates We re seeking aGraphQL-focused Software Engineerwho can design, implement and evolve high-performing APIs that scale. If crafting elegant GraphQL schemas, building robust TypeScript/Node.js services, and deploying to cloud-native environments is your idea of fun, this is your next project. What You ll Do * Design & developGraphQL APIs from schema design to production integration, ensuring performance, flexibility, and maintainability. * Buildscalable TypeScript/Node.js servicesthat integrate seamlessly with modern frontends and data sources. * ApplyDevOps best practicesto deliver through CI/CD pipelines (Jenkins, Concourse), Docker, Helm, and Kubernetes.
        Location:West London (Hybrid 2 days/week on site, hear Heathrow) Contract:6 months initial (extensions highly likely) Start:ASAP Eligibility:UK-based candidates only Rate:Market rates We re seeking aGraphQL-focused Software Engineerwho can design, implement and evolve high-performing APIs that scale. If crafting elegant GraphQL schemas, building robust TypeScript/Node.js services, and deploying to cloud-native environments is your idea of fun, this is your next project. What You ll Do * Design & developGraphQL APIs from schema design to production integration, ensuring performance, flexibility, and maintainability. * Buildscalable TypeScript/Node.js servicesthat integrate seamlessly with modern frontends and data sources. * ApplyDevOps best practicesto deliver through CI/CD pipelines (Jenkins, Concourse), Docker, Helm, and Kubernetes.
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        Senior Java Developer

        TALENT INTERNATIONAL UK LTD
        EC4V, City of London
        Unspecified
        * Java Developer - SC Cleared * Hybrid Working - Manchester OR Newcastle * 6 months - Starting in October * £500-£550 Inside IR35 Talent Consulting is seeking multiple Java Developers to join a high-profile government organisation on an exciting new programme of work. You'll be part of a collaborative team working on modern, large-scale services that make a real difference. * Transform business requirements into production-ready code * Ensure system robustness, resilience, and stability * Develop and maintain a fit-for-purpose automated test suite * Produce comprehensive technical documentation for wider consumption Contribute to the design of larger systems as part of a team * Collaborate across teams, working with Lead Engineers and Technical Architects to explore technical solutions
        * Java Developer - SC Cleared * Hybrid Working - Manchester OR Newcastle * 6 months - Starting in October * £500-£550 Inside IR35 Talent Consulting is seeking multiple Java Developers to join a high-profile government organisation on an exciting new programme of work. You'll be part of a collaborative team working on modern, large-scale services that make a real difference. * Transform business requirements into production-ready code * Ensure system robustness, resilience, and stability * Develop and maintain a fit-for-purpose automated test suite * Produce comprehensive technical documentation for wider consumption Contribute to the design of larger systems as part of a team * Collaborate across teams, working with Lead Engineers and Technical Architects to explore technical solutions
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        NEW
        Lynx are looking for an Enterprise Platform Architect for a 6-month contract with a leading organisation in Stratford, East London (2 days/week on-site). * Lead the application and integration architecture strategy * Define enterprise roadmaps, patterns, and governance processes * Provide architectural leadership across business and technology teams * Work with cloud platforms (AWS, GCP, O365), API integration, containerisation, and microservices * Apply architectural frameworks (TOGAF/Zachman) to deliver strategic value Rate: £540/day Inside IR35 client runs payroll & covers employers NI Location: Stratford, East London (2 days/week on-site) If youre an experienced architect with a strategic mindset, please apply!
        Lynx are looking for an Enterprise Platform Architect for a 6-month contract with a leading organisation in Stratford, East London (2 days/week on-site). * Lead the application and integration architecture strategy * Define enterprise roadmaps, patterns, and governance processes * Provide architectural leadership across business and technology teams * Work with cloud platforms (AWS, GCP, O365), API integration, containerisation, and microservices * Apply architectural frameworks (TOGAF/Zachman) to deliver strategic value Rate: £540/day Inside IR35 client runs payroll & covers employers NI Location: Stratford, East London (2 days/week on-site) If youre an experienced architect with a strategic mindset, please apply!
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        Full Stack Developer - React / Python London | Hybrid (2 days office and 3 days from home) £60K-£70K + Equity | Full-Time | Start-up We're a high-growth start-up building a leading healthcare! Looking for a Full Stack developer who loves working across the stack - React on the front end, Python on the back end. * Build responsive UIs in React * Develop APIs & services in Python (either Django/Flask/FastAPI) * Own features end-to-end * Help shape our tech stack * Strong React & Python skills * API & database experience * A proactive, problem-solving mindset * Ideally start-up or scale-up experience Why us? * Big impact from day one * Technical ownership & flexibility * Career growth + equity options Apply with your CV + GitHub Robert Half Ltd acts as an employment business for temporary positions and an employment agency for permanent positions.
        Full Stack Developer - React / Python London | Hybrid (2 days office and 3 days from home) £60K-£70K + Equity | Full-Time | Start-up We're a high-growth start-up building a leading healthcare! Looking for a Full Stack developer who loves working across the stack - React on the front end, Python on the back end. * Build responsive UIs in React * Develop APIs & services in Python (either Django/Flask/FastAPI) * Own features end-to-end * Help shape our tech stack * Strong React & Python skills * API & database experience * A proactive, problem-solving mindset * Ideally start-up or scale-up experience Why us? * Big impact from day one * Technical ownership & flexibility * Career growth + equity options Apply with your CV + GitHub Robert Half Ltd acts as an employment business for temporary positions and an employment agency for permanent positions.
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        Senior Full Stack Engineer React .Net Python

        Client Server
        South Kensington, SW7
        £100000 - £150000 per annum + bonus + benefits
        Senior Full Stack Engineer / Developer (React .Net Python) London to £150k Do you have expertise with React combined with a strong appreciation of .Net and / or Python backend systems? You could be progressing your career in a senior, hands-on role at a Hedge Fund with over $10 billion under management. As a Senior Full Stack Engineer you will take ownership of user interface / frontend development in the London office for both web and mobile applications, collaborating with colleagues in the New York office. You will architect and design high quality, performant, visually compelling applications with a focus on developing React based responsive web applications with mobile first design and integrating front end applications with backend services in .Net and Python within cloud based environments.
        Senior Full Stack Engineer / Developer (React .Net Python) London to £150k Do you have expertise with React combined with a strong appreciation of .Net and / or Python backend systems? You could be progressing your career in a senior, hands-on role at a Hedge Fund with over $10 billion under management. As a Senior Full Stack Engineer you will take ownership of user interface / frontend development in the London office for both web and mobile applications, collaborating with colleagues in the New York office. You will architect and design high quality, performant, visually compelling applications with a focus on developing React based responsive web applications with mobile first design and integrating front end applications with backend services in .Net and Python within cloud based environments.
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        NEWPREMIUM
        Digital Transformation Manager - Low Code Development and Data Engineering - Full time permanent role - Hybrid (West London 3 days a week) - Salary up to £70,000 plus 25 days holiday and travel paid A successful West London business is currently looking for an experienced Digital Transformation Manager to join its IT function. This exciting new role will focus on the design and development of low code applications as well as data warehouses/pipelines. - Leading on the design and implementation of low-code applications across the Microsoft Power Platform - Improving efficiency through automating solutions - Driving AI strategy - Oversee system enhancements and API integrations - Oversee data engineering process - ETL/ELT pipelines with Azure Data Factory - Drive development of Snowflake Data Warehouse - Team management and leading Data Engineers/Developers
        Digital Transformation Manager - Low Code Development and Data Engineering - Full time permanent role - Hybrid (West London 3 days a week) - Salary up to £70,000 plus 25 days holiday and travel paid A successful West London business is currently looking for an experienced Digital Transformation Manager to join its IT function. This exciting new role will focus on the design and development of low code applications as well as data warehouses/pipelines. - Leading on the design and implementation of low-code applications across the Microsoft Power Platform - Improving efficiency through automating solutions - Driving AI strategy - Oversee system enhancements and API integrations - Oversee data engineering process - ETL/ELT pipelines with Azure Data Factory - Drive development of Snowflake Data Warehouse - Team management and leading Data Engineers/Developers
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        FEATURED

        Applications Support Analyst

        Kudos Partners
        Datchet Common, SL3
        £70,000 per annum plus 12% bonus - generous benefits package
        Location:West of London | Hybrid (1 day in office) Salary:Competitive + Benefits + Flexible Working Why Join? * Hybrid working only 1 day per week in the office * Established FinTech company with a collaborative, supportive culture * Key role in supporting high-profile web and mobile applications (including BigCommerce) * Exposure to Azure, APIs, D365, and cutting-edge digital solutions Were seeking anexperienced Applications Support Analystto join our growing FinTech team. Thisbusiness-criticalrole will lead the support for a new digital platform, ensuring smooth operation and exceptional service for internal stakeholders. * Deliver 2nd and 3rd line support for digital applications, resolving issues within SLAs * Minimise downtime and drive continuous improvement across web/mobile platforms
        Location:West of London | Hybrid (1 day in office) Salary:Competitive + Benefits + Flexible Working Why Join? * Hybrid working only 1 day per week in the office * Established FinTech company with a collaborative, supportive culture * Key role in supporting high-profile web and mobile applications (including BigCommerce) * Exposure to Azure, APIs, D365, and cutting-edge digital solutions Were seeking anexperienced Applications Support Analystto join our growing FinTech team. Thisbusiness-criticalrole will lead the support for a new digital platform, ensuring smooth operation and exceptional service for internal stakeholders. * Deliver 2nd and 3rd line support for digital applications, resolving issues within SLAs * Minimise downtime and drive continuous improvement across web/mobile platforms
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        We're looking for a technical steward of enterprise metadata assets, ensuring governance, quality, and regulatory compliance across complex data landscapes. You will be the subject matter expert for data cataloguing, metadata synchronisation, and stewardship best practices. helping us build a trusted foundation for AI, analytics, and digital transformation. What You’ll Do Metadata Curation & Governance * Define and implement enterprise metadata standards, business glossaries, and classification schemas. * Establish data quality KPIs, SLAs, and governance metrics. * Build automated discovery workflows to enable self-service analytics. * Champion adoption of governed data assets across business and technical teams. Technical Stewardship * Configure cross-platform metadata synchronisation between Alation, Databricks (Unity Catalog), and downstream systems.
        We're looking for a technical steward of enterprise metadata assets, ensuring governance, quality, and regulatory compliance across complex data landscapes. You will be the subject matter expert for data cataloguing, metadata synchronisation, and stewardship best practices. helping us build a trusted foundation for AI, analytics, and digital transformation. What You’ll Do Metadata Curation & Governance * Define and implement enterprise metadata standards, business glossaries, and classification schemas. * Establish data quality KPIs, SLAs, and governance metrics. * Build automated discovery workflows to enable self-service analytics. * Champion adoption of governed data assets across business and technical teams. Technical Stewardship * Configure cross-platform metadata synchronisation between Alation, Databricks (Unity Catalog), and downstream systems.
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        NEWFEATURED

        Full Stack Engineer, GraphQL APIs, TypeScript, Node

        Staffworx Limited
        Brentford End, TW7
        market rates, outside IR35, 6 months initial, 2 days week on site
        Full Stack Software Engineer GraphQL | TypeScript | Cloud-Native Based West London, Hybrid working, 1-2 days week on site. Outside IR35. 6 months initial, likely extensions. Were looking for aFull Stack Software Engineerwho loves building high-quality, scalable systems and isn't afraid to get deep into both the code and the infrastructure. If GraphQL APIs, TypeScript/Node.js backends and cloud-native deployments make you feel right at home, this is your stage. What you ll be doing * Design & buildrobust, scalableTypeScript/Node.jsservices andGraphQL APIsthat power real-world applications. * Write code that lastsclean, maintainable, well-tested, and resilient. * Shape our infrastructurethrough modern DevOps practices: CI/CD pipelines (Jenkins, Concourse), containerisation, Helm, and Kubernetes deployments.
        Full Stack Software Engineer GraphQL | TypeScript | Cloud-Native Based West London, Hybrid working, 1-2 days week on site. Outside IR35. 6 months initial, likely extensions. Were looking for aFull Stack Software Engineerwho loves building high-quality, scalable systems and isn't afraid to get deep into both the code and the infrastructure. If GraphQL APIs, TypeScript/Node.js backends and cloud-native deployments make you feel right at home, this is your stage. What you ll be doing * Design & buildrobust, scalableTypeScript/Node.jsservices andGraphQL APIsthat power real-world applications. * Write code that lastsclean, maintainable, well-tested, and resilient. * Shape our infrastructurethrough modern DevOps practices: CI/CD pipelines (Jenkins, Concourse), containerisation, Helm, and Kubernetes deployments.
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        Data Engineer

        JAM Recruitment Ltd
        St James, SW1Y 5AD
        £650 - £745 per day + Umbrella, inside IR35
        eSC Cleared Data Engineer Bristol or London (Mostly working from home) Up to £745 per day (Umbrella, Inside IR35) Must hold live and transferrable Enhanced SC Security Clearance About the Role We're seeking an experienced Data Engineer to join a high-profile programme, working with cutting-edge cloud and data technologies. You'll be instrumental in building, optimising, and maintaining scalable data pipelines and platforms that underpin mission-critical systems. If you thrive on solving complex data challenges, working with modern orchestration tools, and applying best practices in security and compliance, this role offers both technical depth and impact. Key Responsibilities * Design & Optimise Pipelines - Build and refine ETL/ELT workflows using Apache Airflow for orchestration.
        eSC Cleared Data Engineer Bristol or London (Mostly working from home) Up to £745 per day (Umbrella, Inside IR35) Must hold live and transferrable Enhanced SC Security Clearance About the Role We're seeking an experienced Data Engineer to join a high-profile programme, working with cutting-edge cloud and data technologies. You'll be instrumental in building, optimising, and maintaining scalable data pipelines and platforms that underpin mission-critical systems. If you thrive on solving complex data challenges, working with modern orchestration tools, and applying best practices in security and compliance, this role offers both technical depth and impact. Key Responsibilities * Design & Optimise Pipelines - Build and refine ETL/ELT workflows using Apache Airflow for orchestration.
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        NEW
        We have an exciting opportunity for a Senior Salesforce Administrator / Developer(Technical Specialist) at NPL. The focus for this role is to lead on the design, development, and support of the platform. Youll be joining the Enterprise Systems team. Salesforce is becoming a crucial business tool within NPL and we require a Snr Salesforce Administrator/Developer(Technical Specialist) to support the adoption within the business. The person will be required to collaborate withkey stakeholders in the organisation, including Sales, Marketing, Commercial Excellence,business analysts,project managersand end-users to gather and analyse their business needs and requirements, and to consequently drive the development of the Salesforce platform in response to those needs to meet strategic objectives.
        We have an exciting opportunity for a Senior Salesforce Administrator / Developer(Technical Specialist) at NPL. The focus for this role is to lead on the design, development, and support of the platform. Youll be joining the Enterprise Systems team. Salesforce is becoming a crucial business tool within NPL and we require a Snr Salesforce Administrator/Developer(Technical Specialist) to support the adoption within the business. The person will be required to collaborate withkey stakeholders in the organisation, including Sales, Marketing, Commercial Excellence,business analysts,project managersand end-users to gather and analyse their business needs and requirements, and to consequently drive the development of the Salesforce platform in response to those needs to meet strategic objectives.
        more
        NEWFEATURED

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        Frequently Asked Questions

        How many contract API jobs are there in Clerkenwell?
        There are 61 contract API jobs within 20 miles of Clerkenwell available on Jobsite right now.

        Where in Clerkenwell are these contract jobs?
        You can find contract jobs in Southwark, Brentford End, Covent Garden.

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