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        257 Contract API jobs in London + 20 miles

        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
        Senior Full Stack Developer / Engineer (JavaScript Python API) London to £100k Opportunity to progress your career in a senior, hands-on Senior Full Stack Developer 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 Full Stack Developer 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 Full Stack Developer / Engineer (JavaScript Python API) London to £100k Opportunity to progress your career in a senior, hands-on Senior Full Stack Developer 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 Full Stack Developer 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

        Backend Software Engineer Golang Kafka - Start-up

        Client Server
        EC2A, City of London, EC2A 4EB
        £90000 - £110000 per annum + benefits
        Backend Software Engineer / Developer (Golang Kafka API) London / WFH to £110k Do you have a deep knowledge of Go / Golang combined with software architecture and design skills? You could be progressing your career as a Backend Software Engineer at a start-up payments technology company that is revolutionising the payments industry to Africa, improving speed, cost and reliability. As a Backend Software Engineer you'll focus on backend system design, event driven architecture and APIs with a focus on scalability and reliability. You'll join a small, collaborative, Agile team working on 2 week sprints, you'll be a key part of tech discussions and decision making. You'll join colleagues in the London, Canary Wharf offices three days a week (also the possibility to be remote in the UK).
        Backend Software Engineer / Developer (Golang Kafka API) London / WFH to £110k Do you have a deep knowledge of Go / Golang combined with software architecture and design skills? You could be progressing your career as a Backend Software Engineer at a start-up payments technology company that is revolutionising the payments industry to Africa, improving speed, cost and reliability. As a Backend Software Engineer you'll focus on backend system design, event driven architecture and APIs with a focus on scalability and reliability. You'll join a small, collaborative, Agile team working on 2 week sprints, you'll be a key part of tech discussions and decision making. You'll join colleagues in the London, Canary Wharf offices three days a week (also the possibility to be remote in the UK).
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        NEWPREMIUM
        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
        Hybrid: Two days in our client's London office and three days working from home. On Monday morning, you might be refining an API connection between a collections database and a public-facing platform. By Wednesday, you could be writing a PHP 8.2 script to automate image processing for a new exhibition launch. Friday afternoon? Testing out an AI tool to help curators search archive materials faster. That’s the reality of life as a Backend Integration Developer here. No two weeks look the same. The mix of backend software development, systems integration, and cloud infrastructure work means you’ll constantly be learning, solving problems, and collaborating with colleagues from across the organisation. This is a fantastic opportunity for a technically adaptable developer to join a nationally respected cultural institution with an ambitious digital vision.
        Hybrid: Two days in our client's London office and three days working from home. On Monday morning, you might be refining an API connection between a collections database and a public-facing platform. By Wednesday, you could be writing a PHP 8.2 script to automate image processing for a new exhibition launch. Friday afternoon? Testing out an AI tool to help curators search archive materials faster. That’s the reality of life as a Backend Integration Developer here. No two weeks look the same. The mix of backend software development, systems integration, and cloud infrastructure work means you’ll constantly be learning, solving problems, and collaborating with colleagues from across the organisation. This is a fantastic opportunity for a technically adaptable developer to join a nationally respected cultural institution with an ambitious digital vision.
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        PREMIUM
        Hybrid: Two days in our client's London office and three days working from home. On Monday morning, you might be refining an API connection between a collections database and a public-facing platform. By Wednesday, you could be writing a PHP 8.2 script to automate image processing for a new exhibition launch. Friday afternoon? Testing out an AI tool to help curators search archive materials faster. That’s the reality of life as a Backend Integration Developer here. No two weeks look the same. The mix of backend software development, systems integration, and cloud infrastructure work means you’ll constantly be learning, solving problems, and collaborating with colleagues from across the organisation. This is a fantastic opportunity for a technically adaptable developer to join a nationally respected cultural institution with an ambitious digital vision.
        Hybrid: Two days in our client's London office and three days working from home. On Monday morning, you might be refining an API connection between a collections database and a public-facing platform. By Wednesday, you could be writing a PHP 8.2 script to automate image processing for a new exhibition launch. Friday afternoon? Testing out an AI tool to help curators search archive materials faster. That’s the reality of life as a Backend Integration Developer here. No two weeks look the same. The mix of backend software development, systems integration, and cloud infrastructure work means you’ll constantly be learning, solving problems, and collaborating with colleagues from across the organisation. This is a fantastic opportunity for a technically adaptable developer to join a nationally respected cultural institution with an ambitious digital vision.
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        NEWFEATURED

        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
        Robert Half Technology are assisting a global market leading AI powered tech company to recruit a Salesforce Developer on a contract basis - hybrid working - London based. Outside IR35 Join a growing Data & Revenue Operations (D&R) Team. This role is an opportunity to deliver high-impact improvements to our Salesforce platform while driving integrations with a modern GTM technology stack. You'll work closely with the Sales, Service, and Operations teams to deliver both quick wins and strategic improvements within Salesforce. This is a hands-on role for someone who can get up to speed quickly, spot opportunities for improvement, and deliver tangible impact over 3-6 months. Role 1. Salesforce Development & Enhancements * Design and build custom Apex code, Lightning components, and Flows to support evolving business needs.
        Robert Half Technology are assisting a global market leading AI powered tech company to recruit a Salesforce Developer on a contract basis - hybrid working - London based. Outside IR35 Join a growing Data & Revenue Operations (D&R) Team. This role is an opportunity to deliver high-impact improvements to our Salesforce platform while driving integrations with a modern GTM technology stack. You'll work closely with the Sales, Service, and Operations teams to deliver both quick wins and strategic improvements within Salesforce. This is a hands-on role for someone who can get up to speed quickly, spot opportunities for improvement, and deliver tangible impact over 3-6 months. Role 1. Salesforce Development & Enhancements * Design and build custom Apex code, Lightning components, and Flows to support evolving business needs.
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        NEW

        .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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        NEW
        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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        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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        Role: React Native Developer Location: London / Knutsford/ Glasgow / Northampton - Any location (Hybrid) Duration: 6 Months Day rate: £400 - £450 Umbrella Only As a Senior React Native Developer, you will play a key role in shaping the architecture, performance, and quality of our mobile applications. You'll lead development efforts, promote best practices, and work closely with product managers and designers to deliver user-centric solutions that scale. This role goes beyond coding-you'll be a technical steward, setting standards and fostering a culture of continuous improvement across the mobile development team. * Lead the development of mobile applications using React Native and modern JavaScript (ES6+). * Drive technical design and implementation of new features, ensuring code quality and maintainability.
        Role: React Native Developer Location: London / Knutsford/ Glasgow / Northampton - Any location (Hybrid) Duration: 6 Months Day rate: £400 - £450 Umbrella Only As a Senior React Native Developer, you will play a key role in shaping the architecture, performance, and quality of our mobile applications. You'll lead development efforts, promote best practices, and work closely with product managers and designers to deliver user-centric solutions that scale. This role goes beyond coding-you'll be a technical steward, setting standards and fostering a culture of continuous improvement across the mobile development team. * Lead the development of mobile applications using React Native and modern JavaScript (ES6+). * Drive technical design and implementation of new features, ensuring code quality and maintainability.
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        PREMIUM
        My client is a high-profile consultancy who require an Endur Solution Architect, with experience in Endur and in Energy Trading and Risk Management (ETRM) systems, to work closely with an end customer. * Proven expertise as a Subject Matter Expert (SME) in Energy Trading and Risk Management (ETRM) systems, with deep specialization in Endur. * Ability to deliver strategic guidance and solutions for complex trading and risk management scenarios. * Strong capability to optimize Endur functionalities across front-office, middle-office, and back-office operations. * Demonstrated technical leadership in Endur-related projects, ensuring alignment with business goals and industry standards. * Solid understanding of system integration principles, including APIs, middleware, and data interfaces for seamless enterprise connectivity.
        My client is a high-profile consultancy who require an Endur Solution Architect, with experience in Endur and in Energy Trading and Risk Management (ETRM) systems, to work closely with an end customer. * Proven expertise as a Subject Matter Expert (SME) in Energy Trading and Risk Management (ETRM) systems, with deep specialization in Endur. * Ability to deliver strategic guidance and solutions for complex trading and risk management scenarios. * Strong capability to optimize Endur functionalities across front-office, middle-office, and back-office operations. * Demonstrated technical leadership in Endur-related projects, ensuring alignment with business goals and industry standards. * Solid understanding of system integration principles, including APIs, middleware, and data interfaces for seamless enterprise connectivity.
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        NEW
        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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        Software Developer - Active SC, Python, AWS

        Hays
        London
        £400.0 - £425.0 per day + up to £425 per day (InsideIR35)
        Up to £425 per day (Inside IR35) London / Primarily Remote 8 Months My client is an international consultancy, who require a Software Developer that holds active SC clearance, with Python, Terraform and AWS to work closely with a key end client. * Proven experience as a software developer with data integration experience (API) * Extensive experience programming in Python * Active Security Clearance (SC) * Expertise in AWS, Kubernetes and CI/CD (Continuous Integration / Continuous Deployment) * Strong working knowledge of Elastic, Kibana and React * Excellent communication skills * Working knowledge of Docker / Single Sign On * Familiarity with Agile practices If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.
        Up to £425 per day (Inside IR35) London / Primarily Remote 8 Months My client is an international consultancy, who require a Software Developer that holds active SC clearance, with Python, Terraform and AWS to work closely with a key end client. * Proven experience as a software developer with data integration experience (API) * Extensive experience programming in Python * Active Security Clearance (SC) * Expertise in AWS, Kubernetes and CI/CD (Continuous Integration / Continuous Deployment) * Strong working knowledge of Elastic, Kibana and React * Excellent communication skills * Working knowledge of Docker / Single Sign On * Familiarity with Agile practices If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.
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        NEW
        Senior Dataverse & Power Platform Integration Developer Outside IR35 | Circa £500 p/d | Hybrid (Near London) | Immediate Start We are seeking an experienced Senior Software Developer with strong Dataverse, Power Platform, and Azure integrations experience for a high-impact contract. You will be working on the delivery of a secure, fully orchestrated client lifecycle management system for a leading professional services organisation. This role involves end-to-end integration delivery - from configuring Microsoft Fabric & Dataverse environments, building ETL pipelines, and crafting API endpoints, to enabling workflow automation with Logic Apps and Power Platform. You will collaborate closely with technical and business teams to ensure secure, accurate, and reliable data movement across the ecosystem. Responsibilities * Configure Microsoft Fabric & Dataverse environments
        Senior Dataverse & Power Platform Integration Developer Outside IR35 | Circa £500 p/d | Hybrid (Near London) | Immediate Start We are seeking an experienced Senior Software Developer with strong Dataverse, Power Platform, and Azure integrations experience for a high-impact contract. You will be working on the delivery of a secure, fully orchestrated client lifecycle management system for a leading professional services organisation. This role involves end-to-end integration delivery - from configuring Microsoft Fabric & Dataverse environments, building ETL pipelines, and crafting API endpoints, to enabling workflow automation with Logic Apps and Power Platform. You will collaborate closely with technical and business teams to ensure secure, accurate, and reliable data movement across the ecosystem. Responsibilities * Configure Microsoft Fabric & Dataverse environments
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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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        FEATURED
        Full Stack Engineer / Developer (JavaScript TypeScript) WFH / London to £75k Opportunity to progress your career as a Full Stack Developer working on Tech for Good application for the healthcare sector that utilises AI and Machine Learning techniques to help prevent patients from experiencing health crisis. As a Full Stack Engineer you'll collaborate with a small team working on internal tools and data platforms, with a focus on implementing robust security practices and scalable architectures. You'll use a range of technology, primarily JavaScript on the backend and TypeScript on the frontend, you'll build secure, responsive user interfaces, implement RESTful APIs, optimise database queries for performance and ensure solutions are highly scalable and maintainable. This is a great opportunity to join a scaling start-up in a role that you can shape and influence.
        Full Stack Engineer / Developer (JavaScript TypeScript) WFH / London to £75k Opportunity to progress your career as a Full Stack Developer working on Tech for Good application for the healthcare sector that utilises AI and Machine Learning techniques to help prevent patients from experiencing health crisis. As a Full Stack Engineer you'll collaborate with a small team working on internal tools and data platforms, with a focus on implementing robust security practices and scalable architectures. You'll use a range of technology, primarily JavaScript on the backend and TypeScript on the frontend, you'll build secure, responsive user interfaces, implement RESTful APIs, optimise database queries for performance and ensure solutions are highly scalable and maintainable. This is a great opportunity to join a scaling start-up in a role that you can shape and influence.
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        NEWPREMIUM

        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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        Job Role: Full-Stack JavaScript Developer Contract Duration: 3 month contract Location: Remote (UK only) Daily rate: £350 per day (Outside IR35) We are seeking a highly skilled Full-Stack JavaScript Developer to lead the build of a new client website using Next.js, Tailwind CSS, and Contentful CMS. You will be responsible for front-end development, CMS integration, and deployment, working closely with designers, QA, and project managers to deliver a fast, modern, and reliable site on time. * Build a responsive, accessible, and high-performance front-end using Next.js and Tailwind CSS. * Build performance backend API services using Next.js * Set up new Contentful environments and keep the backend synchronised with the external Contentful CMS using Contentfuls API * Collaborate with QA and UAT teams to resolve issues quickly.
        Job Role: Full-Stack JavaScript Developer Contract Duration: 3 month contract Location: Remote (UK only) Daily rate: £350 per day (Outside IR35) We are seeking a highly skilled Full-Stack JavaScript Developer to lead the build of a new client website using Next.js, Tailwind CSS, and Contentful CMS. You will be responsible for front-end development, CMS integration, and deployment, working closely with designers, QA, and project managers to deliver a fast, modern, and reliable site on time. * Build a responsive, accessible, and high-performance front-end using Next.js and Tailwind CSS. * Build performance backend API services using Next.js * Set up new Contentful environments and keep the backend synchronised with the external Contentful CMS using Contentfuls API * Collaborate with QA and UAT teams to resolve issues quickly.
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        NEW
        Description Our client is a leading research organization focused on advancing the future of virtual and augmented reality technologies. Their Audio Research team is dedicated to two transformative goals: creating virtual sounds that are perceptually indistinguishable from reality, and redefining human hearing. These innovations aim to foster deeper human connection across distances and enable seamless communication in challenging acoustic environments. They are seeking acontract software engineerto support and enhance the software and systems used in their data collection lab located inCambridge, UK. The role involves building software that interfaces with cutting-edge prototype devices and integrating them into a robust data collection platform.
        Description Our client is a leading research organization focused on advancing the future of virtual and augmented reality technologies. Their Audio Research team is dedicated to two transformative goals: creating virtual sounds that are perceptually indistinguishable from reality, and redefining human hearing. These innovations aim to foster deeper human connection across distances and enable seamless communication in challenging acoustic environments. They are seeking acontract software engineerto support and enhance the software and systems used in their data collection lab located inCambridge, UK. The role involves building software that interfaces with cutting-edge prototype devices and integrating them into a robust data collection platform.
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        PREMIUM

        Full Stack Developer

        Understanding Recruitment
        East London, London, E1 6BD
        Remote Working
        Location: Fully Remote I'm partnered with a well known UK charity who are hiring for a full stack developer to join the team. Key skills for this role are knowledge of .Net, C#, Entity Framework, SQL server, API's and a experience in full stack positions and also an approachable manner in order to gather requirements from teams within the business. The Full Stack Developer will be supporting a key organisational project working on an in-house tool allowing partner organisations to work more efficiently. - .Net Core C#, Entity Framework, LINQ, Razor Pages experience - Strong experience with API's and integration - Good communication skills and a self starter .Net / C# / Integration Developer Apply now for immediate consideration regarding this excellent opportunity! Understanding Recruitment is acting as an employment agency for this vacancy
        Location: Fully Remote I'm partnered with a well known UK charity who are hiring for a full stack developer to join the team. Key skills for this role are knowledge of .Net, C#, Entity Framework, SQL server, API's and a experience in full stack positions and also an approachable manner in order to gather requirements from teams within the business. The Full Stack Developer will be supporting a key organisational project working on an in-house tool allowing partner organisations to work more efficiently. - .Net Core C#, Entity Framework, LINQ, Razor Pages experience - Strong experience with API's and integration - Good communication skills and a self starter .Net / C# / Integration Developer Apply now for immediate consideration regarding this excellent opportunity! Understanding Recruitment is acting as an employment agency for this vacancy
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        Robert Half Technology are assisting a global market leading consultancy at the forefront of delivering enterprise-scale digital transformation projects for some of the world's most recognised brands. With a proven track record in innovation and delivery excellence, they are now seeking to recruit multiple ServiceNow Consultants on a contract basis - remote working - UK based. As a ServiceNow Consultant, you'll play a pivotal role in designing, configuring, and implementing ServiceNow solutions to meet complex business needs. Working alongside talented technical teams and senior stakeholders, you'll be part of mission-critical transformation projects spanning ITSM, HRSD, CSM, and other ServiceNow modules. Role * The ServiceNow Consultant will lead and deliver ServiceNow architecture, implementation, configuration, and customisation activities.
        Robert Half Technology are assisting a global market leading consultancy at the forefront of delivering enterprise-scale digital transformation projects for some of the world's most recognised brands. With a proven track record in innovation and delivery excellence, they are now seeking to recruit multiple ServiceNow Consultants on a contract basis - remote working - UK based. As a ServiceNow Consultant, you'll play a pivotal role in designing, configuring, and implementing ServiceNow solutions to meet complex business needs. Working alongside talented technical teams and senior stakeholders, you'll be part of mission-critical transformation projects spanning ITSM, HRSD, CSM, and other ServiceNow modules. Role * The ServiceNow Consultant will lead and deliver ServiceNow architecture, implementation, configuration, and customisation activities.
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        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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        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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        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 257 contract API jobs within 20 miles of London available on Jobsite right now.

        Where in London are these contract jobs?
        You can find contract jobs in City of London, South East London, East London.

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