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        57 Contract API jobs in Clerkenwell + 20 miles

        Workplace Platform Engineer (DocuSign & 365 & API)

        Morson Edge
        City of London, London, EC1A 1AA
        Market related
        We are seeking a Platform Engineer to join the Modern Workplace team at a leading banking client. This team is focused on delivering a flexible, efficient, and seamless digital workplace experience, enabling colleagues to collaborate and perform effectively using enterprise tools such as Microsoft 365 and DocuSign. The successful candidate will be a key contributor to the Productivity Applications portfolio, responsible for configuring, maintaining, and enhancing platforms that support a high-performing digital workplace. Key Responsibilities * Configure, develop, and maintain solutions across the Productivity Applications platform * Contribute to the design and implementation of new digital workplace capabilities * Manage the end-to-end lifecycle of platform solutions, ensuring continuous improvement * Support business-as-usual changes and incremental enhancements
        We are seeking a Platform Engineer to join the Modern Workplace team at a leading banking client. This team is focused on delivering a flexible, efficient, and seamless digital workplace experience, enabling colleagues to collaborate and perform effectively using enterprise tools such as Microsoft 365 and DocuSign. The successful candidate will be a key contributor to the Productivity Applications portfolio, responsible for configuring, maintaining, and enhancing platforms that support a high-performing digital workplace. Key Responsibilities * Configure, develop, and maintain solutions across the Productivity Applications platform * Contribute to the design and implementation of new digital workplace capabilities * Manage the end-to-end lifecycle of platform solutions, ensuring continuous improvement * Support business-as-usual changes and incremental enhancements
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        PREMIUM
        We’re looking for a proactive, self-sufficient developer with strong experience in .NET, API development, microservices architecture, and database integration.
        We’re looking for a proactive, self-sufficient developer with strong experience in .NET, API development, microservices architecture, and database integration.
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        FEATURED
        Skilled in API integration, middleware (e.g., MuleSoft, Boomi), and data modeling.
        Skilled in API integration, middleware (e.g., MuleSoft, Boomi), and data modeling.
        NEWFEATURED
        You’ll bring hands-on expertise in building and maintaining scalable automation frameworks at both end-to-end and API levels, ensuring high-quality delivery through risk-based testing and rapid feedback loops.
        You’ll bring hands-on expertise in building and maintaining scalable automation frameworks at both end-to-end and API levels, ensuring high-quality delivery through risk-based testing and rapid feedback loops.
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        FEATURED
        Lead Integration Architect - 12 Months Contract Outside IR35 £600 to £650 a day - 3 days a week in Dartford Kent - A global powerhouse in the Infrastructure and Built Environment sector is urgently seeking a visionary Integration Architect to spearhead the connectivity for a multi-million-pound Digital Manufacturing Cloud (DMC) transformation. This isn't a maintenance role. You will own the entire integration architecture, acting as the master orchestrator for a complex ecosystem. You will ensure that high-level ERP and HR systems communicate perfectly with the precision-engineered data flows of PLM, MES, and QMS platforms. As an integration Architect you will have the following responsibilities * Define the integration architecture that allows disparate enterprise systems to speak a single, fluent language.
        Lead Integration Architect - 12 Months Contract Outside IR35 £600 to £650 a day - 3 days a week in Dartford Kent - A global powerhouse in the Infrastructure and Built Environment sector is urgently seeking a visionary Integration Architect to spearhead the connectivity for a multi-million-pound Digital Manufacturing Cloud (DMC) transformation. This isn't a maintenance role. You will own the entire integration architecture, acting as the master orchestrator for a complex ecosystem. You will ensure that high-level ERP and HR systems communicate perfectly with the precision-engineered data flows of PLM, MES, and QMS platforms. As an integration Architect you will have the following responsibilities * Define the integration architecture that allows disparate enterprise systems to speak a single, fluent language.
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        FEATURED

        Lead C# Engineer - Agentic Workflows & AI Engineering, AWS

        Smart Sourcer Limited
        City of London (EC1)
        From £800 to £900 per day OUTSIDE IR35
        SeniorStaff-level backend engineer with deep, current expertise in C# and .NET Core 8/9, capable of architecting and leading the design of distributed REST API microservices at scale. * Authority in AWS serverless architecture; Lambda-first, with strong working knowledge of API Gateway, SQS, Step Functions, EventBridge and IAM, and a track record of shipping production workloads on this stack. * Strong API design sensibility; versioning, documentation, throttling, backwards compatibility and a genuine obsession with developer experience.
        SeniorStaff-level backend engineer with deep, current expertise in C# and .NET Core 8/9, capable of architecting and leading the design of distributed REST API microservices at scale. * Authority in AWS serverless architecture; Lambda-first, with strong working knowledge of API Gateway, SQS, Step Functions, EventBridge and IAM, and a track record of shipping production workloads on this stack. * Strong API design sensibility; versioning, documentation, throttling, backwards compatibility and a genuine obsession with developer experience.
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        Backend Developer - Java

        Infoplus Technologies UK Ltd
        The City, City of London (EC3), EC4R 9AA
        Unspecified
        Role: Backend Developer - Java - Location: Edinburgh / London, UK - Duration: Contract - Your Profile * 510 years of overall software development experience, with minimum 4+ years of hands on Java development * Strong experience with Java 9+ * Proven expertise in Spring Framework (Spring Boot, Spring MVC, Spring Core) * Hands on experience building backend services and APIs and Microservices * Solid understanding of object oriented design, design patterns, and clean code principles * Experience working in Agile / Scrum environments * Strong problem solving and debugging skills * Ability to work effectively in distributed, multi team environments * Experience with SaaS based architectures * Exposure to event driven architecture (Kafka, JMS, or equivalent) * Experience with system integration and enterprise messaging * Knowledge of cloud platforms (GCP preferred)
        Role: Backend Developer - Java - Location: Edinburgh / London, UK - Duration: Contract - Your Profile * 510 years of overall software development experience, with minimum 4+ years of hands on Java development * Strong experience with Java 9+ * Proven expertise in Spring Framework (Spring Boot, Spring MVC, Spring Core) * Hands on experience building backend services and APIs and Microservices * Solid understanding of object oriented design, design patterns, and clean code principles * Experience working in Agile / Scrum environments * Strong problem solving and debugging skills * Ability to work effectively in distributed, multi team environments * Experience with SaaS based architectures * Exposure to event driven architecture (Kafka, JMS, or equivalent) * Experience with system integration and enterprise messaging * Knowledge of cloud platforms (GCP preferred)
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        A global consultancy operating in mobile telecoms and satellite is looking for an Enterprise Architect to lead service and operational transformation across their client programmes. You will own the architectural vision for operational support and service assurance, working closely with client product, engineering and commercial teams to drive measurable improvements in service quality, platform resilience and partner ecosystem integration. * Defining and owning target-state architecture for OSS and service assurance platforms across satellite and terrestrial networks * Designing service assurance frameworks covering fault management, performance monitoring, SLA management, and root cause analysis * Leading the architectural roadmap for satellite and mobile, focused on interoperability and ecosystem enablement
        A global consultancy operating in mobile telecoms and satellite is looking for an Enterprise Architect to lead service and operational transformation across their client programmes. You will own the architectural vision for operational support and service assurance, working closely with client product, engineering and commercial teams to drive measurable improvements in service quality, platform resilience and partner ecosystem integration. * Defining and owning target-state architecture for OSS and service assurance platforms across satellite and terrestrial networks * Designing service assurance frameworks covering fault management, performance monitoring, SLA management, and root cause analysis * Leading the architectural roadmap for satellite and mobile, focused on interoperability and ecosystem enablement
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        Enterprise Architect – Corporate Technology

        Ventula Consulting Limited
        South West London (SW1)
        From £850 to £900 per day
        One of the worlds great FMCGs (FTSE 100) requires an Enterprise Architect in its Corporate Tech function. This role is anchored in Enterprise Architecture and is focused on building and maturing EA capability in an evolving Corporate Functions environment. It combines strong architectural judgement with the ability to partner, influence, and drive pragmatic, outcome-led change in a landscape with emerging maturity and legacy complexity. As an Enterprise Architect with deep expertise in Finance and Corporate Technologies, you will bridge the gap between enterprise technology and key business objectives across corporate functions. You will design and govern architectures that enable enterprise-wide transformation, ensuring alignment with CFO, CHRO, CPO, and General Counsel priorities. Your domain knowledge will drive the evolution of systems for core Finance, HR, Legal, and ...
        One of the worlds great FMCGs (FTSE 100) requires an Enterprise Architect in its Corporate Tech function. This role is anchored in Enterprise Architecture and is focused on building and maturing EA capability in an evolving Corporate Functions environment. It combines strong architectural judgement with the ability to partner, influence, and drive pragmatic, outcome-led change in a landscape with emerging maturity and legacy complexity. As an Enterprise Architect with deep expertise in Finance and Corporate Technologies, you will bridge the gap between enterprise technology and key business objectives across corporate functions. You will design and govern architectures that enable enterprise-wide transformation, ensuring alignment with CFO, CHRO, CPO, and General Counsel priorities. Your domain knowledge will drive the evolution of systems for core Finance, HR, Legal, and ...
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        Contract BI Developer

        Hanson Lee Resourcing Ltd
        City of London (EC2)
        Up to £550 per day
        Were working closely with a London Market Insurance Syndicate to hire an experienced Contract Data Engineer to support the ongoing development and enhancement of its core data environment. This is a hands-on role focused on building and optimising the data platform, data warehouse and wider data ecosystem, helping to improve data quality, accessibility and reporting capability across the Syndicate. This opportunity would suit someone with strong Lloyds / London Market experience and a solid background in Azure-based data engineering. What youll be doing * Build, enhance and support the data ecosystem, including the Syndicate Data Hub * Develop and maintain ETL / ELT pipelines for ingesting, transforming and delivering data * Support the design and evolution of the data model, with a focus on Syndicate-specific requirements
        Were working closely with a London Market Insurance Syndicate to hire an experienced Contract Data Engineer to support the ongoing development and enhancement of its core data environment. This is a hands-on role focused on building and optimising the data platform, data warehouse and wider data ecosystem, helping to improve data quality, accessibility and reporting capability across the Syndicate. This opportunity would suit someone with strong Lloyds / London Market experience and a solid background in Azure-based data engineering. What youll be doing * Build, enhance and support the data ecosystem, including the Syndicate Data Hub * Develop and maintain ETL / ELT pipelines for ingesting, transforming and delivering data * Support the design and evolution of the data model, with a focus on Syndicate-specific requirements
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        Dev Ops SME?

        Randstad Digital
        City of London (EC1)
        £400 - £600 per day
        Senior AWS DevOps Engineer (Test & Infrastructure Resilience) Location: Remote Working - Security Clearance: Must be eligible for SC Clearance - 6 Months Contract £400 to £600 a day inside IR35 - A top-tier consultancy firm is looking for an experienced AWS DevOps Engineer with a strong background in testing to help maintain and evolve Critical National Infrastructure (CNI) for a top UK client. This is a pivotal role in maintaining critical national infrastructure where scalability and resilience are essential. We're looking for a highly skilled DevOps engineer with a strong background in testing (including APIs). The ideal candidate should be self-motivated and results-driven, capable of thriving in an Agile team. You'll need to be comfortable with Confluence for documentation and Jira for project tracking and story management.
        Senior AWS DevOps Engineer (Test & Infrastructure Resilience) Location: Remote Working - Security Clearance: Must be eligible for SC Clearance - 6 Months Contract £400 to £600 a day inside IR35 - A top-tier consultancy firm is looking for an experienced AWS DevOps Engineer with a strong background in testing to help maintain and evolve Critical National Infrastructure (CNI) for a top UK client. This is a pivotal role in maintaining critical national infrastructure where scalability and resilience are essential. We're looking for a highly skilled DevOps engineer with a strong background in testing (including APIs). The ideal candidate should be self-motivated and results-driven, capable of thriving in an Agile team. You'll need to be comfortable with Confluence for documentation and Jira for project tracking and story management.
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        FEATURED

        Python Developer

        Halian Technology Limited
        City of London, London, EC4M 5SB
        £600 per day
        UK / Hybrid / Remote?? £600 Inside IR35? 912 Month Contract - We are currently looking for an experienced Python Developer to join a growing engineering team. Youll be working on backend systems and scalable applications in a fast-moving environment. This is a hands-on role youll be expected to come in, get up to speed quickly, and own delivery. Key Responsibilities * Design and develop backend services using Python * Build and maintain REST APIs and microservices * Work with cloud platforms (AWS, Azure or GCP) * Collaborate with cross-functional teams * Contribute to system design, performance and scalability * Support CI/CD and DevOps practices - Key Skills & Experience * Strong commercial Python experience * Django, FastAPI or Flask * REST APIs and microservices * Cloud (AWS, Azure or GCP) * Docker / Kubernetes * SQL (PostgreSQL or similar) * Previous contract experience is a plus
        UK / Hybrid / Remote?? £600 Inside IR35? 912 Month Contract - We are currently looking for an experienced Python Developer to join a growing engineering team. Youll be working on backend systems and scalable applications in a fast-moving environment. This is a hands-on role youll be expected to come in, get up to speed quickly, and own delivery. Key Responsibilities * Design and develop backend services using Python * Build and maintain REST APIs and microservices * Work with cloud platforms (AWS, Azure or GCP) * Collaborate with cross-functional teams * Contribute to system design, performance and scalability * Support CI/CD and DevOps practices - Key Skills & Experience * Strong commercial Python experience * Django, FastAPI or Flask * REST APIs and microservices * Cloud (AWS, Azure or GCP) * Docker / Kubernetes * SQL (PostgreSQL or similar) * Previous contract experience is a plus
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        Role: Data Solutions Architect (SC Cleared) Contract: 3-6 months initial - Day rate: £500pd-£550pd (Inside IR35) Location: London (Hybrid working) We are working with a large-scale consultancy who require a Data Solutions Architect to work on an Azure Data project. The role will require someone who is SC Cleared and will be hybrid working, based in London. * Design secure, scalable data solutions across application, data, integration, infrastructure and security domains. * Architect cloud data platforms and analytics stacks (e.g. Azure Databricks, Microsoft Fabric) including distributed processing (Spark). * Translate functional and non-functional requirements (security, performance, availability, resilience) into resilient target architectures. * Define current-state, target-state and transition architectures, including phased roadmaps and dependency-aware migration plans.
        Role: Data Solutions Architect (SC Cleared) Contract: 3-6 months initial - Day rate: £500pd-£550pd (Inside IR35) Location: London (Hybrid working) We are working with a large-scale consultancy who require a Data Solutions Architect to work on an Azure Data project. The role will require someone who is SC Cleared and will be hybrid working, based in London. * Design secure, scalable data solutions across application, data, integration, infrastructure and security domains. * Architect cloud data platforms and analytics stacks (e.g. Azure Databricks, Microsoft Fabric) including distributed processing (Spark). * Translate functional and non-functional requirements (security, performance, availability, resilience) into resilient target architectures. * Define current-state, target-state and transition architectures, including phased roadmaps and dependency-aware migration plans.
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        Competitive salary - Bromley, Kent - Fixed Term Contract (12 Months) Were looking for an experienced Frontend Developer (React & React Native) to join our Digital Solutions team on a 12-month fixed-term contract. In this hands-on role, youll play a key part in growing our digital platform, delivering intuitive omni-channel services for our customers, and enhancing the workflows and systems that support our customer-facing teams. Youll be involved across the full development lifecycle from collaborating with the business to understand customer needs, through design and build, to testing and release. Strong React and React Native expertise, a passion for clean, scalable front-end development, and a customer-first mindset will be critical to your success. What you will do * Design, build and maintain web applications using React
        Competitive salary - Bromley, Kent - Fixed Term Contract (12 Months) Were looking for an experienced Frontend Developer (React & React Native) to join our Digital Solutions team on a 12-month fixed-term contract. In this hands-on role, youll play a key part in growing our digital platform, delivering intuitive omni-channel services for our customers, and enhancing the workflows and systems that support our customer-facing teams. Youll be involved across the full development lifecycle from collaborating with the business to understand customer needs, through design and build, to testing and release. Strong React and React Native expertise, a passion for clean, scalable front-end development, and a customer-first mindset will be critical to your success. What you will do * Design, build and maintain web applications using React
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        FEATURED
        SAP Solution Architect (S/4HANA | Supply Chain) Dartford, Kent (3 days onsite) Contract: 12-18 months £600-£650/day (Outside IR35) The Opportunity - We're currently recruiting for a SAP Solution Architect to join a major transformation programme within a complex manufacturing environment. This role will take ownership of SAP solution design across key enterprise capabilities, with a strong focus on supply chain, logistics, and manufacturing processes. Key Responsibilities * Lead end-to-end SAP solution architecture across core domains (ERP, supply chain, warehouse, quality, etc.) * Define and design integration architecture with systems such as PLM, MES, and data platforms * Work closely with business and technical teams across design, procurement, and build phases * Drive solution standardisation and SAP-first approach across capabilities
        SAP Solution Architect (S/4HANA | Supply Chain) Dartford, Kent (3 days onsite) Contract: 12-18 months £600-£650/day (Outside IR35) The Opportunity - We're currently recruiting for a SAP Solution Architect to join a major transformation programme within a complex manufacturing environment. This role will take ownership of SAP solution design across key enterprise capabilities, with a strong focus on supply chain, logistics, and manufacturing processes. Key Responsibilities * Lead end-to-end SAP solution architecture across core domains (ERP, supply chain, warehouse, quality, etc.) * Define and design integration architecture with systems such as PLM, MES, and data platforms * Work closely with business and technical teams across design, procurement, and build phases * Drive solution standardisation and SAP-first approach across capabilities
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        FEATURED

        Frontend developer

        Rullion Limited
        Clerkenwell, City of London (EC1), EC1M 6PB
        Negotiable
        Join a dynamic energy provider dedicated to sustainable solutions in the UK. We seek enthusiastic and resourceful Frontend Developers at mid to senior levels who are passionate about crafting exceptional user experiences. Initially it will be a three-month rolling contract but there is potential for it to be extended. The role is Hybrid, with one day a week being based in their London office. It is a full-time role, 40 hours per week. If this role feels right, send us your CV. * Play a key role in building responsive, accessible, and scalable web applications. * Develop and maintain features using modern JavaScript frameworks, particularly React. * Collaborate closely within a cross-functional agile team that includes backend engineers, designers, and product managers. * Translate design mockups and prototypes into pixel-perfect, performant user interfaces.
        Join a dynamic energy provider dedicated to sustainable solutions in the UK. We seek enthusiastic and resourceful Frontend Developers at mid to senior levels who are passionate about crafting exceptional user experiences. Initially it will be a three-month rolling contract but there is potential for it to be extended. The role is Hybrid, with one day a week being based in their London office. It is a full-time role, 40 hours per week. If this role feels right, send us your CV. * Play a key role in building responsive, accessible, and scalable web applications. * Develop and maintain features using modern JavaScript frameworks, particularly React. * Collaborate closely within a cross-functional agile team that includes backend engineers, designers, and product managers. * Translate design mockups and prototypes into pixel-perfect, performant user interfaces.
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        NEW

        Product Manager - Customer & Transactional Comms

        Sanderson Recruitment
        City of London (EC1), EC1
        £70 - £600 per day + Umbrella engagement
        Senior Product Manager / Product Lead / Lead Product Manager / Digital Product Manager £600-700 inside IR35/Umbrella engagement and 2-3 days per week on site in London. Transactional communications platform - We've partnered with a well known brand who are looking for a Senior Product Manager / Product Manager to drive the delivery of a enterprise-wide transactional communications platform - This platform will underpin all customer communications triggered by transactions and events - including order confirmations, delivery updates, returns, account notifications, and service communications across email, SMS, push, and in-app channels. You will be responsible for defining the product vision, roadmap, and operating model, ensuring the platform is scalable, reliable, and capable of delivering personalised, real-time communications at scale. Product Strategy & Vision
        Senior Product Manager / Product Lead / Lead Product Manager / Digital Product Manager £600-700 inside IR35/Umbrella engagement and 2-3 days per week on site in London. Transactional communications platform - We've partnered with a well known brand who are looking for a Senior Product Manager / Product Manager to drive the delivery of a enterprise-wide transactional communications platform - This platform will underpin all customer communications triggered by transactions and events - including order confirmations, delivery updates, returns, account notifications, and service communications across email, SMS, push, and in-app channels. You will be responsible for defining the product vision, roadmap, and operating model, ensuring the platform is scalable, reliable, and capable of delivering personalised, real-time communications at scale. Product Strategy & Vision
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        FEATURED
        Key Responsibilities * Develop, test, and maintain high-performance backend applications using Python * Design and build RESTful APIs using FastAPI * Automate deployment, configuration, and infrastructure management using Ansible * Collaborate with DevOps teams to implement and maintain CI/CD pipelines * Manage cloud-based infrastructure and containerized applications (Docker/Kubernetes) * Write clean, efficient, and reusable code following best practices * Troubleshoot, debug, and optimize application performance * Ensure security, scalability, and reliability of systems
        Key Responsibilities * Develop, test, and maintain high-performance backend applications using Python * Design and build RESTful APIs using FastAPI * Automate deployment, configuration, and infrastructure management using Ansible * Collaborate with DevOps teams to implement and maintain CI/CD pipelines * Manage cloud-based infrastructure and containerized applications (Docker/Kubernetes) * Write clean, efficient, and reusable code following best practices * Troubleshoot, debug, and optimize application performance * Ensure security, scalability, and reliability of systems
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        Head of Product - Customer Comms Platform

        Sanderson Recruitment
        City of London (EC1), EC1
        £600 - £750 per day + Umbrella engagement
        Head of Product / Head of Digital Product / Senior Product Manager / Product Lead / Lead Product Manager £750 per day, inside IR35/Umbrella engagement and 2-3 days per week on site in London. Transactional communications platform - We've partnered with a well known brand who are looking for a Head of Product / Senior Product Manager to drive the delivery of a enterprise-wide transactional communications platform - This platform will underpin all customer communications triggered by transactions and events - including order confirmations, delivery updates, returns, account notifications, and service communications across email, SMS, push, and in-app channels. You will be responsible for defining the product vision, roadmap, and operating model, ensuring the platform is scalable, reliable, and capable of delivering personalised, real-time communications at scale.
        Head of Product / Head of Digital Product / Senior Product Manager / Product Lead / Lead Product Manager £750 per day, inside IR35/Umbrella engagement and 2-3 days per week on site in London. Transactional communications platform - We've partnered with a well known brand who are looking for a Head of Product / Senior Product Manager to drive the delivery of a enterprise-wide transactional communications platform - This platform will underpin all customer communications triggered by transactions and events - including order confirmations, delivery updates, returns, account notifications, and service communications across email, SMS, push, and in-app channels. You will be responsible for defining the product vision, roadmap, and operating model, ensuring the platform is scalable, reliable, and capable of delivering personalised, real-time communications at scale.
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        FEATURED

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        Frequently Asked Questions

        How many contract API jobs are there in Clerkenwell?
        There are 57 contract API jobs within 20 miles of Clerkenwell available on CWJobs right now.

        Where in Clerkenwell are these contract jobs?
        You can find contract jobs in The City, City (EC3), Canary Wharf, Englefield Green.

        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, Architecture, amongst many others.