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40 Contract API jobs in Clerkenwell + 20 miles
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AMS is a global workforce solutions partner committed to creating inclusive, dynamic, and future-ready workplaces. We help organisations adapt, grow, and thrive in an ever-evolving world by building, shaping, and optimising diverse talent strategies. Our Contingent Workforce Solutions (CWS) is one of our service offerings. Acting as an extension of their recruitment teams, we connect them with skilled interim and temporary professionals, fostering workplaces where everyone can contribute and succeed. Our client, a major UK retail bank, provides every day banking services to over 17 million retail customers. The banks expertise and services span across Business Services, Corporate banking, Wealth Management, Group Functions, Retail and Investment Banking. On behalf of this organisation, AMS are looking for 3 - Full Stack Developers for acontract until end of 2025 based
AMS is a global workforce solutions partner committed to creating inclusive, dynamic, and future-ready workplaces. We help organisations adapt, grow, and thrive in an ever-evolving world by building, shaping, and optimising diverse talent strategies. Our Contingent Workforce Solutions (CWS) is one of our service offerings. Acting as an extension of their recruitment teams, we connect them with skilled interim and temporary professionals, fostering workplaces where everyone can contribute and succeed. Our client, a major UK retail bank, provides every day banking services to over 17 million retail customers. The banks expertise and services span across Business Services, Corporate banking, Wealth Management, Group Functions, Retail and Investment Banking. On behalf of this organisation, AMS are looking for 3 - Full Stack Developers for acontract until end of 2025 based
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Solid background in Apex, LWC, SOQL, and REST/SOAP API integration.
Solid background in Apex, LWC, SOQL, and REST/SOAP API integration.
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AI Solution Architect (AI Agents, Retail / eCommerce)
AI Solution Architect (AI Agents, Retail / eCommerce)
Staffworx Limited
WC1A, Central London
market rates, outside IR35 or permanent
Utilize AWS services (Lambda, S3, API Gateway, SageMaker, DynamoDB, ECS, etc.) to deploy scalable AI solutions. * Experience with AI/ML frameworks such as TensorFlow, PyTorch, OpenAI API, or LangChain. * Strong understanding of API design, including REST, GraphQL, and WebSockets.
Utilize AWS services (Lambda, S3, API Gateway, SageMaker, DynamoDB, ECS, etc.) to deploy scalable AI solutions. * Experience with AI/ML frameworks such as TensorFlow, PyTorch, OpenAI API, or LangChain. * Strong understanding of API design, including REST, GraphQL, and WebSockets.
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API Integration
API Integration
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Implement and manage API and UI performance testing using JMeter, ensuring scalability and responsiveness of applications. * Utilize Fetch API to automate interactions with web services and validate data flows.
Implement and manage API and UI performance testing using JMeter, ensuring scalability and responsiveness of applications. * Utilize Fetch API to automate interactions with web services and validate data flows.
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7+ years of hands-on coding in server side Java with strong emphasis on Concurrency, Collections API, Messaging and Event processing across multiple streams * Coding with FIX protocol, ION API is a strong plus
7+ years of hands-on coding in server side Java with strong emphasis on Concurrency, Collections API, Messaging and Event processing across multiple streams * Coding with FIX protocol, ION API is a strong plus
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7+ years of hands-on coding in server side Java with strong emphasis on Concurrency, Collections API, Messaging and Event processing across multiple streams * Coding with FIX protocol, ION API is a strong plus
7+ years of hands-on coding in server side Java with strong emphasis on Concurrency, Collections API, Messaging and Event processing across multiple streams * Coding with FIX protocol, ION API is a strong plus
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Strong knowledge of GraphQL (API design, schema evolution, integration).
Strong knowledge of GraphQL (API design, schema evolution, integration).
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Familiarity with tools for working with Large Language Models via API or in a local context (e.g. HuggingFace transformers).
Familiarity with tools for working with Large Language Models via API or in a local context (e.g. HuggingFace transformers).
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Build and maintain API-based interfaces, ensuring security and compliance with industry standards.
Build and maintain API-based interfaces, ensuring security and compliance with industry standards.
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Anypoint API Manager
Anypoint API Manager
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Contract / Outside IR35 - A leading UK-based organisation is undergoing a strategic transformation of its enterprise systems, with Workday at the core of its HR and finance operations. We're seeking a Lead Integration Architect to design and oversee the integration landscape, ensuring seamless data flows across platforms using Workato. Key Responsibilities * Define and lead integration architecture across Workday and other enterprise platforms * Develop scalable, reusable integration patterns using Workato and other middleware tools * Ensure alignment with enterprise architecture principles and IT governance * Collaborate with Workday implementation teams to ensure integration readiness * Design and implement data flows between Workday and legacy systems * Support data migration, validation, and reconciliation * Own Workato platform governance, performance, and roadma
Contract / Outside IR35 - A leading UK-based organisation is undergoing a strategic transformation of its enterprise systems, with Workday at the core of its HR and finance operations. We're seeking a Lead Integration Architect to design and oversee the integration landscape, ensuring seamless data flows across platforms using Workato. Key Responsibilities * Define and lead integration architecture across Workday and other enterprise platforms * Develop scalable, reusable integration patterns using Workato and other middleware tools * Ensure alignment with enterprise architecture principles and IT governance * Collaborate with Workday implementation teams to ensure integration readiness * Design and implement data flows between Workday and legacy systems * Support data migration, validation, and reconciliation * Own Workato platform governance, performance, and roadma
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Azure Developer
Azure Developer
Queen Square Recruitment Limited
EC2N, City of London
From £500 to £600 per day inside IR35, DOE
Develop cloud-native applications using Azure Cosmos DB (SQL API, Mongo API) * Experience with SQL API and familiarity with other APIs
Develop cloud-native applications using Azure Cosmos DB (SQL API, Mongo API) * Experience with SQL API and familiarity with other APIs
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Good exposure to API Caching and defining NFRs (Non-Functional Requirements) for mobile application?
Good exposure to API Caching and defining NFRs (Non-Functional Requirements) for mobile application?
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This is a fantastic opportunity to work as a contract SuiteCRM Developer on a remote contract, inside IR35. This SuiteCRM Developer will be asked to deliver customisation, integration, and ongoing support for their CRM platform. * SuiteCRM or SugarCRM * PHP * CRM databases * Git * APIs If you do have the relevant experience for this contract SuiteCRM Developer position, please do apply.
This is a fantastic opportunity to work as a contract SuiteCRM Developer on a remote contract, inside IR35. This SuiteCRM Developer will be asked to deliver customisation, integration, and ongoing support for their CRM platform. * SuiteCRM or SugarCRM * PHP * CRM databases * Git * APIs If you do have the relevant experience for this contract SuiteCRM Developer position, please do apply.
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Role :Principal Consultant (Planning Lead) Work mode: Remote - Travel: Should be ready to travel to Netherlands as required (this will be required as needed, e.g. for CRP sessions etc . Apart from this role is remote in UK). Contract duration: 6 months - Location: UK - We are seeking a seasonedFunctional Leadto drive the implementation ofOracle Fusion Cloud Planning modulesincludingSupply Planning and Demand Planning, GOP and S&OP. The ideal candidate will have deep domain expertise in theCPG industry, strong functional knowledge of Oracle Cloud Planning, and experience leading multi-country rollouts in Europe. Must have skills:?? 8+ years of experience in Oracle Planning modules, with 6+ years in Oracle Fusion Cloud. Proven track record in at least 3 full-cycle Oracle Cloud Planning implementations. Strong understanding of CPG industry processes: trade promotions, di
Role :Principal Consultant (Planning Lead) Work mode: Remote - Travel: Should be ready to travel to Netherlands as required (this will be required as needed, e.g. for CRP sessions etc . Apart from this role is remote in UK). Contract duration: 6 months - Location: UK - We are seeking a seasonedFunctional Leadto drive the implementation ofOracle Fusion Cloud Planning modulesincludingSupply Planning and Demand Planning, GOP and S&OP. The ideal candidate will have deep domain expertise in theCPG industry, strong functional knowledge of Oracle Cloud Planning, and experience leading multi-country rollouts in Europe. Must have skills:?? 8+ years of experience in Oracle Planning modules, with 6+ years in Oracle Fusion Cloud. Proven track record in at least 3 full-cycle Oracle Cloud Planning implementations. Strong understanding of CPG industry processes: trade promotions, di
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Head of New Product Delivery (Insurance) *12 month FTC*
Head of New Product Delivery (Insurance) *12 month FTC*
Saga Group Limited
North London, London, N1 4AC
£70,000 - £90,000 dependent on experience + car allowance
Head of New Product Delivery (Insurance) £70,000 - £90,000 dependent on experience + car allowance - 12 month secondment - Hybrid London/Folkestone - At Saga, were not just a business were a trusted brand, built on care, understanding, and delivering the very best for our customers. At Saga we are driving forward in our vision to continue to provide our experience customers with best-in-class insurance products that support their individual needs. In this newly created role, youll join us as Head of Product Development to lead the development of new insurance products. Reporting to the Chief Commercial Officer, you will own the new product delivery agenda, manage the backlog, and drive delivery - working closely with internal teams and partners to launch customer-focused, compliant, and commercially successful products.
Head of New Product Delivery (Insurance) £70,000 - £90,000 dependent on experience + car allowance - 12 month secondment - Hybrid London/Folkestone - At Saga, were not just a business were a trusted brand, built on care, understanding, and delivering the very best for our customers. At Saga we are driving forward in our vision to continue to provide our experience customers with best-in-class insurance products that support their individual needs. In this newly created role, youll join us as Head of Product Development to lead the development of new insurance products. Reporting to the Chief Commercial Officer, you will own the new product delivery agenda, manage the backlog, and drive delivery - working closely with internal teams and partners to launch customer-focused, compliant, and commercially successful products.
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Liberty Wines is modernising its data estate: migrating from on-prem Analysis Services to the cloud, moving our WMS, ERP and bespoke apps to scalable platforms, and expanding AI/ML initiatives. We are evaluating both Fabric and Databricks as a potential strategic fit. As our hands-on Data & Analytics Engineer, youll play a key role in shaping and influencing that decision, helping assess the best platform for our needs based on your experience and contributing to successful delivery on either. You will work end-to-end, from schema design to dashboard storytelling, and be the pivotal data voice in the Technology team. This role offers broad ownership across tooling, standards, engineering and enablement rather than being confined to a narrow BI silo. Key Responsibilities - Data Platform Build-out * Design relational & Lakehouse schemas in Fabric or Databricks
Liberty Wines is modernising its data estate: migrating from on-prem Analysis Services to the cloud, moving our WMS, ERP and bespoke apps to scalable platforms, and expanding AI/ML initiatives. We are evaluating both Fabric and Databricks as a potential strategic fit. As our hands-on Data & Analytics Engineer, youll play a key role in shaping and influencing that decision, helping assess the best platform for our needs based on your experience and contributing to successful delivery on either. You will work end-to-end, from schema design to dashboard storytelling, and be the pivotal data voice in the Technology team. This role offers broad ownership across tooling, standards, engineering and enablement rather than being confined to a narrow BI silo. Key Responsibilities - Data Platform Build-out * Design relational & Lakehouse schemas in Fabric or Databricks
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6-month contract - Outside IR35 - £475 per day - Hybrid - 2 days a week in the London Office - We are seeking a highly capable, hands-on .NET Contractor to deliver high-quality solutions at pace. You will work with a modern .NET codebase (≥ .NET 8.0), occasionally interpreting Java to support .NET implementations. This role suits someone who is delivery-focused, practical, and confident working across platforms. Key Responsibilities * Deliver clean, maintainable, and testable C#/.NET code to a high standard. * Quickly turn around features and tasks without compromising quality. * Interpret existing Java code where required. * Collaborate with SMEs and the Engineering Lead to align with scope and priorities. * Own tasks end-to-end, from requirements to production release, with minimal supervision. Skills & Experience * Strong commercial experience with C# and .NET (Cor
6-month contract - Outside IR35 - £475 per day - Hybrid - 2 days a week in the London Office - We are seeking a highly capable, hands-on .NET Contractor to deliver high-quality solutions at pace. You will work with a modern .NET codebase (≥ .NET 8.0), occasionally interpreting Java to support .NET implementations. This role suits someone who is delivery-focused, practical, and confident working across platforms. Key Responsibilities * Deliver clean, maintainable, and testable C#/.NET code to a high standard. * Quickly turn around features and tasks without compromising quality. * Interpret existing Java code where required. * Collaborate with SMEs and the Engineering Lead to align with scope and priorities. * Own tasks end-to-end, from requirements to production release, with minimal supervision. Skills & Experience * Strong commercial experience with C# and .NET (Cor
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SuiteCRM Developer - Remote - Inside IR35
SuiteCRM Developer - Remote - Inside IR35
The Bridge (IT Recruitment) Limited
Greenwich, SE10 0AA
£430 - 450 per day
This is a fantastic opportunity to work as a contract SuiteCRM Developer on a remote contract, inside IR35. This SuiteCRM Developer will be asked to deliver customisation, integration, and ongoing support for their CRM platform. * SuiteCRM or SugarCRM * PHP * CRM databases * Git * APIs If you do have the relevant experience for this contract SuiteCRM Developer position, please do apply.
This is a fantastic opportunity to work as a contract SuiteCRM Developer on a remote contract, inside IR35. This SuiteCRM Developer will be asked to deliver customisation, integration, and ongoing support for their CRM platform. * SuiteCRM or SugarCRM * PHP * CRM databases * Git * APIs If you do have the relevant experience for this contract SuiteCRM Developer position, please do apply.
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Fully Remote - UK - 3 Month Contract - Rate: £450 - £500 per day (Inside IR35) We are looking to recruit a Senior Front End Developer for a global software organisation on an initial 3 month contract. This is an excellent opportunity to work hands-on with modern frontend technologies, shape the user experience, and mentor junior developers. * Hands-on development of new functionality, building the frontend and integrating with APIs. * Modify and modernise existing functionality to improve performance and usability. * Apply best practices to deliver high-quality, secure, and performant solutions. * Build reusable components and collaborate closely with teams across the business. * Work with product managers, UX/UI designers, and stakeholders to gather requirements and propose effective solutions. * Provide accurate estimates for work items and contribute to project pla
Fully Remote - UK - 3 Month Contract - Rate: £450 - £500 per day (Inside IR35) We are looking to recruit a Senior Front End Developer for a global software organisation on an initial 3 month contract. This is an excellent opportunity to work hands-on with modern frontend technologies, shape the user experience, and mentor junior developers. * Hands-on development of new functionality, building the frontend and integrating with APIs. * Modify and modernise existing functionality to improve performance and usability. * Apply best practices to deliver high-quality, secure, and performant solutions. * Build reusable components and collaborate closely with teams across the business. * Work with product managers, UX/UI designers, and stakeholders to gather requirements and propose effective solutions. * Provide accurate estimates for work items and contribute to project pla
Marketing Manager Technology
Marketing Manager Technology
Staffworx Limited
Chiswick, W4
market rates, outside IR35, 1-2 days week on site
MarTech Marketing Technology Consultant - contract, outside IR35 - NOTE: This is a mid-level consultant role, looking for someone with 4-5 years relevant experience, this is not a head/lead or programme mgt position, hands on MarTech advisory consultant role. Working for upcoming business technology consulting firm with Enterprise client in the Telco and Digital Commerce sectors. You will work with the client to bridge the gap between marketing and technology, supporting the client in assessing, implementing, and optimizing marketing technology solutions to enhance our clients' marketing strategies and operations. This role requires a deep understanding of marketing technology landscapes, strong analytical skills, and the ability to collaborate with cross-functional teams. About the Role - Required skills and experience: 4-5 years in Digital Marketing Technology: as a
MarTech Marketing Technology Consultant - contract, outside IR35 - NOTE: This is a mid-level consultant role, looking for someone with 4-5 years relevant experience, this is not a head/lead or programme mgt position, hands on MarTech advisory consultant role. Working for upcoming business technology consulting firm with Enterprise client in the Telco and Digital Commerce sectors. You will work with the client to bridge the gap between marketing and technology, supporting the client in assessing, implementing, and optimizing marketing technology solutions to enhance our clients' marketing strategies and operations. This role requires a deep understanding of marketing technology landscapes, strong analytical skills, and the ability to collaborate with cross-functional teams. About the Role - Required skills and experience: 4-5 years in Digital Marketing Technology: as a
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Mid-Level C++ Developer (5+ years of experience) Location:Hybrid - 2-3 days onsite in Hounslow - Rate:£430 per day (Inside IR35) Duration:12 months (Extension highly likely) Are you an experienced C++ Developer looking for your next long-term contract? We are seeking a technically strong and versatileMid-Level C++ Developerto join our client's high-performing team on a travel technology project. Key Responsibilities * Develop and maintain high-performance Back End components using C++11 or newer. * Design dynamic, responsive Front End interfaces with AngularJS/Angular 2+. * Support and enhance existing systems with a focus on performance, stability, and maintainability. * Collaborate with cross-functional teams (Product Owners, QA, DevOps, etc.) to deliver new features. * Refactor Legacy code and actively contribute to reducing technical debt.
Mid-Level C++ Developer (5+ years of experience) Location:Hybrid - 2-3 days onsite in Hounslow - Rate:£430 per day (Inside IR35) Duration:12 months (Extension highly likely) Are you an experienced C++ Developer looking for your next long-term contract? We are seeking a technically strong and versatileMid-Level C++ Developerto join our client's high-performing team on a travel technology project. Key Responsibilities * Develop and maintain high-performance Back End components using C++11 or newer. * Design dynamic, responsive Front End interfaces with AngularJS/Angular 2+. * Support and enhance existing systems with a focus on performance, stability, and maintainability. * Collaborate with cross-functional teams (Product Owners, QA, DevOps, etc.) to deliver new features. * Refactor Legacy code and actively contribute to reducing technical debt.
Mobile Developer (iOS / Android) Smart Home / IoT Apps - Location: UK/EMEA (Fully Remote) Rate: £300 £400 per day - We are seeking a talented and creative Mobile Developer (iOS / Android) to join our clients fast-growing digital and smart home technology team. You will be working on the design, development, and optimisation of innovative mobile applications that power the next generation of home automation and IoT devices, used by thousands of customers daily. This is a fantastic opportunity to make an impact on high-profile projects, working within a collaborative, forward-thinking environment that blends mobile, IoT, cloud, and real-time communication technologies. Key Responsibilities * Develop, test, and deploy high-quality iOS and Android applications (native or cross-platform). * Collaborate with product managers, designers, and backend engineers to define and d
Mobile Developer (iOS / Android) Smart Home / IoT Apps - Location: UK/EMEA (Fully Remote) Rate: £300 £400 per day - We are seeking a talented and creative Mobile Developer (iOS / Android) to join our clients fast-growing digital and smart home technology team. You will be working on the design, development, and optimisation of innovative mobile applications that power the next generation of home automation and IoT devices, used by thousands of customers daily. This is a fantastic opportunity to make an impact on high-profile projects, working within a collaborative, forward-thinking environment that blends mobile, IoT, cloud, and real-time communication technologies. Key Responsibilities * Develop, test, and deploy high-quality iOS and Android applications (native or cross-platform). * Collaborate with product managers, designers, and backend engineers to define and d
AWS DevOps Engineer, contract, remote (outside IR35)
AWS DevOps Engineer, contract, remote (outside IR35)
Staffworx Limited
EC1A, City of London
market rates, outside IR35, initial, likely long term extensions
AWS DevOps specialism (Lambda, API Gateway, Route 53, WAF, Shield, IAM, Cognito) * AWS API Gateway
AWS DevOps specialism (Lambda, API Gateway, Route 53, WAF, Shield, IAM, Cognito) * AWS API Gateway