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68 Contract API jobs in Hertfordshire + 20 miles
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A top-tier defense organization is looking for an experienced Axway API Developer / Administrator to join their team on a 6-month contract. * Axway's core products: Policy Studio, API Gateway, and API Manager. If you are an experienced professional with a background in API, MFT, or secure file transfers, this could be the perfect opportunity for you.
A top-tier defense organization is looking for an experienced Axway API Developer / Administrator to join their team on a 6-month contract. * Axway's core products: Policy Studio, API Gateway, and API Manager. If you are an experienced professional with a background in API, MFT, or secure file transfers, this could be the perfect opportunity for you.
NEWFEATURED
Senior JavaScript Engineer / Developer (Vue.js API) London to £100k - Apply now to find out more about this Senior JavaScript Engineer / Developer (JavaScript Vue.js API) opportunity.
Senior JavaScript Engineer / Developer (Vue.js API) London to £100k - Apply now to find out more about this Senior JavaScript Engineer / Developer (JavaScript Vue.js API) opportunity.
NEWPREMIUM
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Backend Software Engineer Java Kotlin AWS
Backend Software Engineer Java Kotlin AWS
Client Server
Shoreditch, EC2A 2AP
£100000 - £120000 per annum
Backend Software Engineer / Developer (Java Kotlin AWS API) Hybrid WFH to £110k
Backend Software Engineer / Developer (Java Kotlin AWS API) Hybrid WFH to £110k
NEWPREMIUM
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Work with cloud platforms (AWS, GCP, O365), API integration, containerisation, and microservices
Work with cloud platforms (AWS, GCP, O365), API integration, containerisation, and microservices
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Strong experience with API and event-driven architectures.
Strong experience with API and event-driven architectures.
NEWFEATURED
Senior Software Developer
Senior Software Developer
Tech 4
E10, East London
From £64,000 to £70,000 per annum + excellent benefits
Assist with the design, implementation, and testing of APIs that adhere to the Open API specification
Assist with the design, implementation, and testing of APIs that adhere to the Open API specification
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Oversee system enhancements and API integrations
Oversee system enhancements and API integrations
NEWFEATURED
Oversee system enhancements and API integrations
Oversee system enhancements and API integrations
FEATURED
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Data Engineer - Defence - Hybrid - Stevenage or Bolton
Data Engineer - Defence - Hybrid - Stevenage or Bolton
Anson Mccade
SG1, Stevenage
From £45,000 to £55,000 per annum
Experience with ETL, API, ESL or similar
Experience with ETL, API, ESL or similar
PREMIUM
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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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API & database experience
API & database experience
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Applications Support Analyst
Applications Support Analyst
Kudos Partners
Datchet Common, SL3
£70,000 per annum plus 12% bonus - generous benefits package
API support and monitoring tools (e.g., SolarWinds, Azure App Insights)
API support and monitoring tools (e.g., SolarWinds, Azure App Insights)
C#, ASP.NET MVC, Web Services/ASP.NET Web API , REST API Asp.Net Core MS SQL server /PostgreSQL Entity Framework /LINQ Knowledge of ASP.NET Core and Client-side Frameworks (jQuery, Angular) Azure DevOps, Git repository and CI/CD Docker/Kubernetes Linux/Micro-Services Architecture - Experience planning and mapping out API integrations.
C#, ASP.NET MVC, Web Services/ASP.NET Web API , REST API Asp.Net Core MS SQL server /PostgreSQL Entity Framework /LINQ Knowledge of ASP.NET Core and Client-side Frameworks (jQuery, Angular) Azure DevOps, Git repository and CI/CD Docker/Kubernetes Linux/Micro-Services Architecture - Experience planning and mapping out API integrations.
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Are you a hands-on Lead or Senior .Net Developer ready to shape architecture and guide talented developers? Want a hybrid role with 3 days WFH? This is your chance to stay close to the code while making key technical decisions that drive real business impact. You'll join a collaborative, forward-thinking team building cutting-edge products — with the support, tools, and flexibility to thrive. Role: Lead Software Developer, Senior .Net Developer, Software Engineering Manager, Senior Full Stack Developer, Lead .Net Developer, Lead Software Engineer, Senior C# Developer - Salary: £65k - £75k base + Bonus - Benefits: 5% pension, 25 days holiday, 2 wellbeing days, Christmas shutdown, private healthcare, life assurance, cinema tickets & more - Location: Milton Keynes – Hybrid (2 days a week in office) If you’ve got strong .Net (C#) experience and skills in GitHub, APIs, Pos
Are you a hands-on Lead or Senior .Net Developer ready to shape architecture and guide talented developers? Want a hybrid role with 3 days WFH? This is your chance to stay close to the code while making key technical decisions that drive real business impact. You'll join a collaborative, forward-thinking team building cutting-edge products — with the support, tools, and flexibility to thrive. Role: Lead Software Developer, Senior .Net Developer, Software Engineering Manager, Senior Full Stack Developer, Lead .Net Developer, Lead Software Engineer, Senior C# Developer - Salary: £65k - £75k base + Bonus - Benefits: 5% pension, 25 days holiday, 2 wellbeing days, Christmas shutdown, private healthcare, life assurance, cinema tickets & more - Location: Milton Keynes – Hybrid (2 days a week in office) If you’ve got strong .Net (C#) experience and skills in GitHub, APIs, Pos
NEWFEATURED
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Strong understanding of Vue 3, Composition API, Pinia.
Strong understanding of Vue 3, Composition API, Pinia.
PREMIUM
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Global Claims IT Leader
Global Claims IT Leader
MARSH CORPORATE SERVICES LIMITED
The City, EC3R 5BU
Pension Scheme, Private Health Insurance & life insurance
Being a cross-functional collaborator interfacing with MMC Enterprise Technology partners, Marsh-Operations, and Transformation Office will come naturally to you building a new set of reusable IT Microservices connected via a well-defined API structure.
Being a cross-functional collaborator interfacing with MMC Enterprise Technology partners, Marsh-Operations, and Transformation Office will come naturally to you building a new set of reusable IT Microservices connected via a well-defined API structure.
NEWPREMIUM
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Take a lead role in the development and support ofMicrosoft MVC and .NET web applications and C# Console and API solutions, ensuring best practices are followed throughout the software lifecycle. * Proficient in.NET (C#), JavaScript, Web API, SQL Server, and working knowledge ofHTML, CSS, XML, JSON.
Take a lead role in the development and support ofMicrosoft MVC and .NET web applications and C# Console and API solutions, ensuring best practices are followed throughout the software lifecycle. * Proficient in.NET (C#), JavaScript, Web API, SQL Server, and working knowledge ofHTML, CSS, XML, JSON.
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Build and work with modern API and microservices architectures
Build and work with modern API and microservices architectures
NEWEQUALITY BOOST
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Build and work with modern API and microservices architectures
Build and work with modern API and microservices architectures
PREMIUM
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REST/SOAP API Integration: Building and consuming APIs for third-party integrations.
REST/SOAP API Integration: Building and consuming APIs for third-party integrations.
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Principal Software Engineer (Cloud Applications)
Principal Software Engineer (Cloud Applications)
Eckoh PLC
HP1, Hemel Hempstead
Up to £100000 per annum
Build cloud-native applications using AWS services such as Lambda, API Gateway, DynamoDB, SQS, and EventBridge * Solid experience with AWS application services (Lambda, API Gateway, Step Functions, DynamoDB, etc.) * Proven ability to design and build modern, API-driven systems in a scalable resilient cloud-based platform * Experience with modern front-end frameworks and API integration (React, Vue, Angular)
Build cloud-native applications using AWS services such as Lambda, API Gateway, DynamoDB, SQS, and EventBridge * Solid experience with AWS application services (Lambda, API Gateway, Step Functions, DynamoDB, etc.) * Proven ability to design and build modern, API-driven systems in a scalable resilient cloud-based platform * Experience with modern front-end frameworks and API integration (React, Vue, Angular)
NEW
My client, a leading digital consultancy are currently looking for a highly skilled and experienced Java Tech Lead to join their engineering team. You will be responsible for leading a team of engineers, providing technical guidance, and ensuring successful delivery of scalable, high-performance solutions using Java, Microservices, GCP, and Kubernetes. This is a hands-on leadership role that combines deep technical expertise with team mentorship and delivery ownership. o Lead a team of backend engineers, providing technical direction and mentoring - o Drive best practices in coding, architecture, design patterns, and DevOps - o Conduct code reviews, provide constructive feedback, and ensure code quality and maintainability - o Collaborate with architects, product managers, and other stakeholders to define technical solutions aligned with business goals o Own the end-t
My client, a leading digital consultancy are currently looking for a highly skilled and experienced Java Tech Lead to join their engineering team. You will be responsible for leading a team of engineers, providing technical guidance, and ensuring successful delivery of scalable, high-performance solutions using Java, Microservices, GCP, and Kubernetes. This is a hands-on leadership role that combines deep technical expertise with team mentorship and delivery ownership. o Lead a team of backend engineers, providing technical direction and mentoring - o Drive best practices in coding, architecture, design patterns, and DevOps - o Conduct code reviews, provide constructive feedback, and ensure code quality and maintainability - o Collaborate with architects, product managers, and other stakeholders to define technical solutions aligned with business goals o Own the end-t
5 Days in office Cambridge - Our client is seeking a contract software engineer to support and enhance the software and systems used in their data collection lab located in Cambridge, UK. The role involves building software that interfaces with cutting-edge prototype devices and integrating them into a robust data collection platform. Youll collaborate with a multidisciplinary team of audio/video engineers, recording technicians, software engineers, and researchers across locations. The role requires strong communication and teamwork skills to scope, prioritize, and deliver high-quality, maintainable software. * Improve efficiency, reliability, and accuracy of data collection processes. * Work with audio, video, inertial measurement, and other sensor equipment. * Deploy, test, and evaluate updates to distributed data collection systems.
5 Days in office Cambridge - Our client is seeking a contract software engineer to support and enhance the software and systems used in their data collection lab located in Cambridge, UK. The role involves building software that interfaces with cutting-edge prototype devices and integrating them into a robust data collection platform. Youll collaborate with a multidisciplinary team of audio/video engineers, recording technicians, software engineers, and researchers across locations. The role requires strong communication and teamwork skills to scope, prioritize, and deliver high-quality, maintainable software. * Improve efficiency, reliability, and accuracy of data collection processes. * Work with audio, video, inertial measurement, and other sensor equipment. * Deploy, test, and evaluate updates to distributed data collection systems.
PREMIUM
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Senior Software Developer
Senior Software Developer
Lean People Services Limited
Luton, Bedfordshire
From £75,000 to £85,000 per annum
up to £85,000 per annum - Full Time Mon-Fri - Our Client provide remote diagnostic solutions and services to the automotive industry. They offer cutting-edge, expert diagnostics using both after-market and original equipment manufacturer tools to provide safe and accurate repairs. The company was founded in 2010 and is headquartered in Plano, TX with UK offices in Peterlee and Bedfordshire. As more automotive software technologies emerge, including autonomous driving, advanced diagnostics, vehicle connectivity, digital cockpits the Company aims to gain a first-mover advantage by developing software solutions with the help of automotive software engineers. If the idea of making an impact on a project lifecycle sounds appealing from its inception down to testing and deployment appeals to you, keep on reading!
up to £85,000 per annum - Full Time Mon-Fri - Our Client provide remote diagnostic solutions and services to the automotive industry. They offer cutting-edge, expert diagnostics using both after-market and original equipment manufacturer tools to provide safe and accurate repairs. The company was founded in 2010 and is headquartered in Plano, TX with UK offices in Peterlee and Bedfordshire. As more automotive software technologies emerge, including autonomous driving, advanced diagnostics, vehicle connectivity, digital cockpits the Company aims to gain a first-mover advantage by developing software solutions with the help of automotive software engineers. If the idea of making an impact on a project lifecycle sounds appealing from its inception down to testing and deployment appeals to you, keep on reading!
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Full Stack Engineer, GraphQL APIs, TypeScript, Node
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.