Date posted
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Locations
Locations
Salaries
Date posted
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17 Contract API jobs in Wallingford + 20 miles
393 exact matches jobs are outside your preferred location
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Automation Tester - .Net - Specflow - Remote - Inside IR35
Automation Tester - .Net - Specflow - Remote - Inside IR35
The Bridge (IT Recruitment) Limited
NN4, Northampton, NN4 0AB
£550 - 575 per day
API
API
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API Knowledge: Experience with APIs, web services, and data exchange formats.
API Knowledge: Experience with APIs, web services, and data exchange formats.
NEW
Build scalable cloud solutions using Azure PaaS services (App Services, Function Apps, API Management, etc.)
Build scalable cloud solutions using Azure PaaS services (App Services, Function Apps, API Management, etc.)
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Skills: C#.Net, XML / JSON API's, SC & NPPV3 Clearance
Skills: C#.Net, XML / JSON API's, SC & NPPV3 Clearance
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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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Proficiency in Microsoft Graph API, Azure OpenAI, and Semantic Kernel
Proficiency in Microsoft Graph API, Azure OpenAI, and Semantic Kernel
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Strong grasp of databases (SQL/NoSQL) and API integrations
Strong grasp of databases (SQL/NoSQL) and API integrations
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Microsoft Graph API understanding for advanced integrations * Experience with SharePoint REST API and modern development practices
Microsoft Graph API understanding for advanced integrations * Experience with SharePoint REST API and modern development practices
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Architect and design enterprise-level integration solutions, defining API-led connectivity, patterns, and specifications. * Proven expertise in MuleSoft Anypoint Platform (including Anypoint Studio, Flow Design, and API Manager). * Strong knowledge of API-led connectivity and integration patterns (REST, SOAP).
Architect and design enterprise-level integration solutions, defining API-led connectivity, patterns, and specifications. * Proven expertise in MuleSoft Anypoint Platform (including Anypoint Studio, Flow Design, and API Manager). * Strong knowledge of API-led connectivity and integration patterns (REST, SOAP).
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RESTful API development experience.
RESTful API development experience.
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Senior EUC Mac Support Engineer - Active SC required
Senior EUC Mac Support Engineer - Active SC required
Skillsbay Limited
SW1A, South West London
£350 per day inside IR35
API integration experience.
API integration experience.
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Microsoft Power Platform / Agentic AI Engineer
Microsoft Power Platform / Agentic AI Engineer
cer Financial
EC2M, City of London
£705 per day £705 per day (via Umbrella)
Microsoft 365 & Graph API Integration * Proficiency in Microsoft Graph API, Azure OpenAI, and Semantic Kernel
Microsoft 365 & Graph API Integration * Proficiency in Microsoft Graph API, Azure OpenAI, and Semantic Kernel
FEATURED
Understanding of API authentication, rate limits, and error handling.
Understanding of API authentication, rate limits, and error handling.
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Maintain and troubleshoot the custom C# .NET backend API used as a wrapper for Contentful CMS. * API Gateway * Solid expertise in C# .NET, particularly in API development and integration. * Familiarity with Contentful CMS and API integration.
Maintain and troubleshoot the custom C# .NET backend API used as a wrapper for Contentful CMS. * API Gateway * Solid expertise in C# .NET, particularly in API development and integration. * Familiarity with Contentful CMS and API integration.
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Mainframe (where relevant): z/OS, CICS, IMS, VSAM, JCL, Control-M, rehost/refactor/API enablement.
Mainframe (where relevant): z/OS, CICS, IMS, VSAM, JCL, Control-M, rehost/refactor/API enablement.
Strong application security background (OWASP Top 10, API security).
Strong application security background (OWASP Top 10, API security).
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Ideal candidates will have a good background in Java and Python, along with a strong understanding of APIs (REST API, XML). * Api
Ideal candidates will have a good background in Java and Python, along with a strong understanding of APIs (REST API, XML). * Api
PREMIUM
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Large Language API's (from 2021) * Assisting with the maintenance and iteration of a FastAPI-based web API hosted on AWS.
Large Language API's (from 2021) * Assisting with the maintenance and iteration of a FastAPI-based web API hosted on AWS.
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Lead all phases of the testing lifecycle, focusing on comprehensive coverage across functional and non-functional testing (e.g., performance, load), encompassing Data, API, and UI layers.
Lead all phases of the testing lifecycle, focusing on comprehensive coverage across functional and non-functional testing (e.g., performance, load), encompassing Data, API, and UI layers.
PREMIUM
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Leading IT Consultancy with offices in UK and Europe (Netherlands, Belgium and Switzerland) is looking to recruit a permanent Senior Angular C# .Net Developer. We deliver a range of services from IT Consultancy, Software Project Development and Application Support Services for our corporate clients covering Insurance, Retail, FMCG, Automotive, Logistics & Leasing, Publishing and Charity domains (including UN organizations) which are well-known names. This Angular C# .NET Developer is a contract role for minimum 6-12 months and has a hybrid work schedule, split between Working from Home and 2 days per week on site in London. The role is open for permanent applications too. 5+ years of commercial experience in C# .NET development essential - Minimum 2 years experience with Angular (v.10+) - mandatory - Rest APIs incorporated with SQL Server or Sybase DB - mandatory
Leading IT Consultancy with offices in UK and Europe (Netherlands, Belgium and Switzerland) is looking to recruit a permanent Senior Angular C# .Net Developer. We deliver a range of services from IT Consultancy, Software Project Development and Application Support Services for our corporate clients covering Insurance, Retail, FMCG, Automotive, Logistics & Leasing, Publishing and Charity domains (including UN organizations) which are well-known names. This Angular C# .NET Developer is a contract role for minimum 6-12 months and has a hybrid work schedule, split between Working from Home and 2 days per week on site in London. The role is open for permanent applications too. 5+ years of commercial experience in C# .NET development essential - Minimum 2 years experience with Angular (v.10+) - mandatory - Rest APIs incorporated with SQL Server or Sybase DB - mandatory
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Power Platform and Azure Architect
Power Platform and Azure Architect
Hays
RG21, Basingstoke
£500.0 - £600 per day + Up to £600 per day Outside IR35
You will be working for a global leader in biotech and animal genetics innovation. They're not just shaping the future of agriculture - they're delivering science with purpose. From gene editing and reproductive biology to next generation breeding technologies, their work directly improves animal health, food quality, and the resilience of the global food system. The Microsoft Power Platform & Azure Solutions Architect will be responsible for designing, implementing, and optimising scalable, secure, and effective solutions using Microsoft Power Platform (Power Apps, Power Automate, Power BI) and Azure services. This role bridges the gap between business needs and IT capabilities, ensuring that solutions support digital transformation, automation, and integration strategies across the organisation.
You will be working for a global leader in biotech and animal genetics innovation. They're not just shaping the future of agriculture - they're delivering science with purpose. From gene editing and reproductive biology to next generation breeding technologies, their work directly improves animal health, food quality, and the resilience of the global food system. The Microsoft Power Platform & Azure Solutions Architect will be responsible for designing, implementing, and optimising scalable, secure, and effective solutions using Microsoft Power Platform (Power Apps, Power Automate, Power BI) and Azure services. This role bridges the gap between business needs and IT capabilities, ensuring that solutions support digital transformation, automation, and integration strategies across the organisation.
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6-month initial contract * Outside IR35 * 2/3 Days per week on site * £750+ per day - Xpertise Recruitment is working in partnership with an FTSE 250 organisation to support the growth of their Enterprise Team. We're currently seeking an experienced Enterprise Architect to lead the design and governance of their enterprise-wide technology landscape. This is a strategic role, focused on aligning IT architecture with business objectives, driving platform efficiency, and guiding the adoption of modern technologies. The successful candidate will work closely with senior stakeholders to shape the future of the organisation's digital ecosystem. * Ensure the D365 CE programme aligns with business strategy and the target operating model. * Map the current IT landscape, including legacy CRM/ERP systems, integration layers, data flows, middleware, and reporting platforms.
6-month initial contract * Outside IR35 * 2/3 Days per week on site * £750+ per day - Xpertise Recruitment is working in partnership with an FTSE 250 organisation to support the growth of their Enterprise Team. We're currently seeking an experienced Enterprise Architect to lead the design and governance of their enterprise-wide technology landscape. This is a strategic role, focused on aligning IT architecture with business objectives, driving platform efficiency, and guiding the adoption of modern technologies. The successful candidate will work closely with senior stakeholders to shape the future of the organisation's digital ecosystem. * Ensure the D365 CE programme aligns with business strategy and the target operating model. * Map the current IT landscape, including legacy CRM/ERP systems, integration layers, data flows, middleware, and reporting platforms.
Job title: Lead Integration Developer - Location: London, UK - Job type: Contract (Inside IR35) About the Role As a Lead Integration Developer, you will be responsible for designing, developing, and maintaining integration solutions across various platforms, including Guidewire InsuranceSuite and other core systems. You will lead a team of developers, collaborate with stakeholders, and ensure the delivery of integration projects that meet business and technical requirements. What will you do? * Lead the design and implementation of integration solutions using APIs, web services, and messaging systems. * Collaborate with business analysts and architects to define integration requirements and strategies. * Develop and maintain integration components using technologies such as Java, REST/JSON, XML, and Enterprise Messaging Systems.
Job title: Lead Integration Developer - Location: London, UK - Job type: Contract (Inside IR35) About the Role As a Lead Integration Developer, you will be responsible for designing, developing, and maintaining integration solutions across various platforms, including Guidewire InsuranceSuite and other core systems. You will lead a team of developers, collaborate with stakeholders, and ensure the delivery of integration projects that meet business and technical requirements. What will you do? * Lead the design and implementation of integration solutions using APIs, web services, and messaging systems. * Collaborate with business analysts and architects to define integration requirements and strategies. * Develop and maintain integration components using technologies such as Java, REST/JSON, XML, and Enterprise Messaging Systems.
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Day rate: £500 - £800 (inside IR35) Duration: 6 - 12 months - Start: ASAP - Hybrid: 3 days on site per week - My client is looking for a Software Developer with AI, Python and JavaScript experience to join on a contract basis. As a Software Developer - AI, you will focus on the development and delivery of Gen AI driven software solutions, working within a dynamic team to enhance our digital products. You will be responsible for writing clean, efficient, and maintainable code, primarily in Python and JavaScript, while contributing to the successful deployment of Gen AI technologies that directly impact the company's customer experience (CX) vision. You will collaborate closely with other software engineers, product teams, and AI specialists to develop LLM AI-powered applications, ensuring their scalability, security, observability and performance.
Day rate: £500 - £800 (inside IR35) Duration: 6 - 12 months - Start: ASAP - Hybrid: 3 days on site per week - My client is looking for a Software Developer with AI, Python and JavaScript experience to join on a contract basis. As a Software Developer - AI, you will focus on the development and delivery of Gen AI driven software solutions, working within a dynamic team to enhance our digital products. You will be responsible for writing clean, efficient, and maintainable code, primarily in Python and JavaScript, while contributing to the successful deployment of Gen AI technologies that directly impact the company's customer experience (CX) vision. You will collaborate closely with other software engineers, product teams, and AI specialists to develop LLM AI-powered applications, ensuring their scalability, security, observability and performance.
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Full Stack Integration Developer - Azure, .NET, NextJS
Full Stack Integration Developer - Azure, .NET, NextJS
Pioneer Search
City of London, London
£600 - £650 per day
A leading technical consultancy is seeking a Full Stack Integration Developer for an Outside IR35 contract. This hybrid role (London-based) offers and requires SC Clearance. You'll play a key role in a large-scale digitisation program, developing and integrating modern web applications within an Azure ecosystem. While primarily hands-on, you'll also contribute to architectural design and strategy. * Application Development: Build and maintain scalable web applications using .NET (C#, ASP.NET Core) and Azure Functions. * Front-End Development: Develop modern UIs using NextJS and other JavaScript frameworks. * Integration & Backend: Work with Azure Service Bus, Event Grid, and Static Web Apps. Design and optimize SQL Server databases, stored procedures, and APIs. * DevOps & Infrastructure: Create and manage CI/CD pipelines using Azure DevOps, GitHub Actions, or Jenkins.
A leading technical consultancy is seeking a Full Stack Integration Developer for an Outside IR35 contract. This hybrid role (London-based) offers and requires SC Clearance. You'll play a key role in a large-scale digitisation program, developing and integrating modern web applications within an Azure ecosystem. While primarily hands-on, you'll also contribute to architectural design and strategy. * Application Development: Build and maintain scalable web applications using .NET (C#, ASP.NET Core) and Azure Functions. * Front-End Development: Develop modern UIs using NextJS and other JavaScript frameworks. * Integration & Backend: Work with Azure Service Bus, Event Grid, and Static Web Apps. Design and optimize SQL Server databases, stored procedures, and APIs. * DevOps & Infrastructure: Create and manage CI/CD pipelines using Azure DevOps, GitHub Actions, or Jenkins.