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        11 Contract API jobs in Windsor + 20 miles

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        DevOps Engineer - Apigee

        ECS
        EC1, City of London
        £350 - £375 per day
        Develop, deploy, and monitor cloud solutions using AWS (Lambda, API Gateway, CloudWatch, ECS, ECR, DynamoDB, S3) * Strong grasp of distributed systems, API security (OAuth, API keys, JWT), and Apigee/APIM platforms
        Develop, deploy, and monitor cloud solutions using AWS (Lambda, API Gateway, CloudWatch, ECS, ECR, DynamoDB, S3) * Strong grasp of distributed systems, API security (OAuth, API keys, JWT), and Apigee/APIM platforms
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        NEW
        Maintain internal API and code documentation. * Strong experience with React, TypeScript, Java, Spring Boot, and RESTful API development.
        Maintain internal API and code documentation. * Strong experience with React, TypeScript, Java, Spring Boot, and RESTful API development.
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        FEATURED
        Build, deploy, and monitor cloud solutions using AWS services (Lambda, API Gateway, CloudWatch, ECS, ECR, DynamoDB, S3). * Design and manage applications using Apigee Edge and X, overseeing the full API lifecycle, driving strategy, and enhancing integrations with analytics. * Enforce security best practices, manage API access (OAuth, API keys, JWT), remediate vulnerabilities, and align with compliance standards in collaboration with security teams. * Strong knowledge of Apigee and API management, including design patterns, performance tuning, and analytics.
        Build, deploy, and monitor cloud solutions using AWS services (Lambda, API Gateway, CloudWatch, ECS, ECR, DynamoDB, S3). * Design and manage applications using Apigee Edge and X, overseeing the full API lifecycle, driving strategy, and enhancing integrations with analytics. * Enforce security best practices, manage API access (OAuth, API keys, JWT), remediate vulnerabilities, and align with compliance standards in collaboration with security teams. * Strong knowledge of Apigee and API management, including design patterns, performance tuning, and analytics.
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        NEW
        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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        NEW

        Angular C# .NET Developer

        O.C.S. Consulting Plc
        W1, Central London
        Competitive Daily Rate
        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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        NEW
        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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        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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        Position: AI Engineer / AI Agent / Backend AI Engineer - Location: Remote - Work Type: Contract - We're looking for an AI Engineer to design and deliver scalable AI/ML systems and agentic applications. You'll work on LLMs, RAG pipelines, model deployment, and cloud-native solutions that drive real-world impact. * Strong coding skills in Java / TypeScript /Python * Experience with LLMs, NLP, and ML frameworks (Hugging Face, PyTorch, TensorFlow, LangChain) * Cloud & DevOps expertise (AWS/Azure, Docker, Kubernetes, CI/CD pipelines) * Knowledge of microservices, APIs, distributed systems - Why join us? * Work on cutting-edge AI innovation * Collaborative, cross-functional environment * Competitive salary + growth opportunities - We encourage you to apply or send me your updated resume to nandiraju . b @ randstad . co. uk
        Position: AI Engineer / AI Agent / Backend AI Engineer - Location: Remote - Work Type: Contract - We're looking for an AI Engineer to design and deliver scalable AI/ML systems and agentic applications. You'll work on LLMs, RAG pipelines, model deployment, and cloud-native solutions that drive real-world impact. * Strong coding skills in Java / TypeScript /Python * Experience with LLMs, NLP, and ML frameworks (Hugging Face, PyTorch, TensorFlow, LangChain) * Cloud & DevOps expertise (AWS/Azure, Docker, Kubernetes, CI/CD pipelines) * Knowledge of microservices, APIs, distributed systems - Why join us? * Work on cutting-edge AI innovation * Collaborative, cross-functional environment * Competitive salary + growth opportunities - We encourage you to apply or send me your updated resume to nandiraju . b @ randstad . co. uk
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        NEWFEATURED

        Java Developer - Active SC

        Hays
        London
        £600.0 - £640.0 per day + up to £640 pd (Inside IR35)
        Up to £640 per day (Inside IR35) London / Remote - 6 months - My client is an instantly recognisable consultancy who urgently requires a Lead Full Stack Developer to join a business-critical programme. * Proven experience working as a Lead Java Developer within the public sector * Active Security Clearance (SC) * Java (8/11/17+): Expert-level programming and deep understanding of the language and its core libraries * Spring Boot: Expert in building RESTful APIs and microservices * AWS: Strong experience with core AWS services (EC2, S3, Lambda, IAM, etc.) * Kafka / Messaging Systems: Expertise in building event-driven architectures * SQL: Strong experience with relational databases and query optimization * REST / JSON APIs: Designing, developing, and consuming scalable APIs * Docker: Proficiency in containerizing applications for local and cloud environments
        Up to £640 per day (Inside IR35) London / Remote - 6 months - My client is an instantly recognisable consultancy who urgently requires a Lead Full Stack Developer to join a business-critical programme. * Proven experience working as a Lead Java Developer within the public sector * Active Security Clearance (SC) * Java (8/11/17+): Expert-level programming and deep understanding of the language and its core libraries * Spring Boot: Expert in building RESTful APIs and microservices * AWS: Strong experience with core AWS services (EC2, S3, Lambda, IAM, etc.) * Kafka / Messaging Systems: Expertise in building event-driven architectures * SQL: Strong experience with relational databases and query optimization * REST / JSON APIs: Designing, developing, and consuming scalable APIs * Docker: Proficiency in containerizing applications for local and cloud environments
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        Position: Backend Engineer - Location: Remote (UK) Work Type: Contract - Join our team to build the backbone of a global music streaming platform! We're looking for a JAVA Backend Engineer who loves coding, solving problems, and delivering features that reach millions of users. * Build scalable Java & SpringBoot microservices. * Develop APIs and backend tools for engineers across the company. * Use TDD, CI/CD, Docker, Kubernetes, Jenkins, and GCP services. * Work with alternate languages like Python, Scala, Golang, or Node.js for backend tasks. * Collaborate in an Agile environment with cross-functional teams. * Strong backend development skills (Java and microservices). * Experience with microservices, TDD, CI/CD, Docker & Kubernetes, and cloud platforms (GCP preferred). * Familiarity with and one of Python, Golang, Scala or Node.js is a plus.
        Position: Backend Engineer - Location: Remote (UK) Work Type: Contract - Join our team to build the backbone of a global music streaming platform! We're looking for a JAVA Backend Engineer who loves coding, solving problems, and delivering features that reach millions of users. * Build scalable Java & SpringBoot microservices. * Develop APIs and backend tools for engineers across the company. * Use TDD, CI/CD, Docker, Kubernetes, Jenkins, and GCP services. * Work with alternate languages like Python, Scala, Golang, or Node.js for backend tasks. * Collaborate in an Agile environment with cross-functional teams. * Strong backend development skills (Java and microservices). * Experience with microservices, TDD, CI/CD, Docker & Kubernetes, and cloud platforms (GCP preferred). * Familiarity with and one of Python, Golang, Scala or Node.js is a plus.
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        NEWFEATURED

        Workday Integration Lead

        Henderson Scott
        London
        £700 - £800 per day + Umbrella rate (inside IR35)
        Senior Workday Integrations Lead - SC Cleared - Inside IR35 Contract - Location: Hybrid (20% in London or Glasgow) | Engagement: Contract - Inside IR35 | Duration: Initial 6 Months | Clearance: SC Clearance Essential - Are you a hands-on Workday Integrations Expert with 7-10 years' experience ready to own and define the entire integration landscape for a complex Workday transformation? Our client requires a high-calibre Senior Workday Integrations Lead to establish and deliver the integrations sub-workstream from the ground up. This role is critical for technical readiness, involving the design of integration patterns that will connect Workday with crucial internal and external systems across HR, Finance, and Payroll. The Role: End-to-End Integration Strategy & Delivery - You will report directly to the Senior Technical Delivery Manager, acting as the primary authorit
        Senior Workday Integrations Lead - SC Cleared - Inside IR35 Contract - Location: Hybrid (20% in London or Glasgow) | Engagement: Contract - Inside IR35 | Duration: Initial 6 Months | Clearance: SC Clearance Essential - Are you a hands-on Workday Integrations Expert with 7-10 years' experience ready to own and define the entire integration landscape for a complex Workday transformation? Our client requires a high-calibre Senior Workday Integrations Lead to establish and deliver the integrations sub-workstream from the ground up. This role is critical for technical readiness, involving the design of integration patterns that will connect Workday with crucial internal and external systems across HR, Finance, and Payroll. The Role: End-to-End Integration Strategy & Delivery - You will report directly to the Senior Technical Delivery Manager, acting as the primary authorit
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        NEWFEATURED
        World Wide Technology (WWT), a global technology integrator and IT solutions provider. World Wide Technology, established in 1990 in St. Louis, Missouri, collaborates with OEMs like Cisco and Dell EMC to offer infrastructure security and custom app development services to Fortune 500 companies in various sectors. With over 10,000 employees globally, we generate $17 billion in annual revenue and operate in regions including the US, UK, Canada, Europe, Costa Rica, APAC, and Middle East. We're proud to be consistently recognized as a top employer by Fortune and Glassdoor for over 13 years. World Wide Technology Holding Co, LLC (WWT) has an opportunity for a AI Platform Operations Manager. Below is the JD for the role. Please help me with the information needed to process your application, and I will contact you to discuss the role. This is a contract Role & Outside IR35
        World Wide Technology (WWT), a global technology integrator and IT solutions provider. World Wide Technology, established in 1990 in St. Louis, Missouri, collaborates with OEMs like Cisco and Dell EMC to offer infrastructure security and custom app development services to Fortune 500 companies in various sectors. With over 10,000 employees globally, we generate $17 billion in annual revenue and operate in regions including the US, UK, Canada, Europe, Costa Rica, APAC, and Middle East. We're proud to be consistently recognized as a top employer by Fortune and Glassdoor for over 13 years. World Wide Technology Holding Co, LLC (WWT) has an opportunity for a AI Platform Operations Manager. Below is the JD for the role. Please help me with the information needed to process your application, and I will contact you to discuss the role. This is a contract Role & Outside IR35
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        NEW
        I am currently assisting a client who operate in a regulated industry, financial services, who are currently embarking a programme of work focused on maturity/designing and implementing security posture utilising SIEM tools such as Google Chronicle & implementing UEBA/SOAR (Security Orchestration, Automation, and Response / User and Entity Behaviour Analytics) built on GCP/Google Cloud so Google SecOps/Security Operations experience is highly desirable. Key Responsibilities; - Enable and validate UEBA alerting within Chronicle SIEM, based on log sources - Deliver a minimum viable UEBA capability with tested detection logic - Provide engineering support to accelerate onboarding of log sources required for UEBA enrichment and detection fidelity - Conduct current state assessment of detection engineering capabilities and log source coverage
        I am currently assisting a client who operate in a regulated industry, financial services, who are currently embarking a programme of work focused on maturity/designing and implementing security posture utilising SIEM tools such as Google Chronicle & implementing UEBA/SOAR (Security Orchestration, Automation, and Response / User and Entity Behaviour Analytics) built on GCP/Google Cloud so Google SecOps/Security Operations experience is highly desirable. Key Responsibilities; - Enable and validate UEBA alerting within Chronicle SIEM, based on log sources - Deliver a minimum viable UEBA capability with tested detection logic - Provide engineering support to accelerate onboarding of log sources required for UEBA enrichment and detection fidelity - Conduct current state assessment of detection engineering capabilities and log source coverage
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        £260 Per Day - Fully Remote - 12 Month Contract - We’re looking for a Quality Engineer who’s passionate about building robust, reliable software and embedding quality into every stage of the development lifecycle. You might come from a testing or development background, but you’ll have a solid grasp of modern QA practices, automation, and cloud-native architectures. You’ll be confident in spotting issues early, designing test strategies that scale, and collaborating with engineers to deliver high-quality solutions for our customers. What you’ll do * Shape and execute test strategies with QA and engineering teams * Bring testing earlier into the SDLC to catch issues sooner * Use a mix of manual, exploratory and automated testing where it makes sense * Build and maintain automated tests that run reliably in CI/CD
        £260 Per Day - Fully Remote - 12 Month Contract - We’re looking for a Quality Engineer who’s passionate about building robust, reliable software and embedding quality into every stage of the development lifecycle. You might come from a testing or development background, but you’ll have a solid grasp of modern QA practices, automation, and cloud-native architectures. You’ll be confident in spotting issues early, designing test strategies that scale, and collaborating with engineers to deliver high-quality solutions for our customers. What you’ll do * Shape and execute test strategies with QA and engineering teams * Bring testing earlier into the SDLC to catch issues sooner * Use a mix of manual, exploratory and automated testing where it makes sense * Build and maintain automated tests that run reliably in CI/CD
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        NEW

        Senior Technical Business Analyst

        Hays
        London
        £650.0 - £800.0 per annum + £700 - £750/day inside via Umbrella
        Your new company - We are currently partnered exclusively with a financial services institution to appoint a Senior Technical Business Analyst to an initial 6-month contract. Working in the Listed Derivatives area of the business, if you're an experienced technical BA with a strong understanding of US Treasury and interest rate futures/futures as a whole, then we want to hear from you. Contract Length: 6-months + potential extension - Start Date: ASAP - Rate: £700 - £750/day inside via Umbrella - Working Arrangements: Hybrid - Your new role and what you'll need to succeed - Working closely with IT, development, and the operations test team, your role as the Senior Technical BA will act as the bridge between IT and the business, translating business needs into technical requirements and ensuring aligned communication across complex technical projects.
        Your new company - We are currently partnered exclusively with a financial services institution to appoint a Senior Technical Business Analyst to an initial 6-month contract. Working in the Listed Derivatives area of the business, if you're an experienced technical BA with a strong understanding of US Treasury and interest rate futures/futures as a whole, then we want to hear from you. Contract Length: 6-months + potential extension - Start Date: ASAP - Rate: £700 - £750/day inside via Umbrella - Working Arrangements: Hybrid - Your new role and what you'll need to succeed - Working closely with IT, development, and the operations test team, your role as the Senior Technical BA will act as the bridge between IT and the business, translating business needs into technical requirements and ensuring aligned communication across complex technical projects.
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        Job title: Digital Developer - Location: London, UK - Job type: Contract (Inside IR35) About the Role You will be responsible for building and customizing digital experiences. This role is ideal for developers who are enthusiastic about modern web technologies, insurance transformation, and agile delivery. What will you do? * Develop and customize digital insurance applications using Guidewire JDP, React.js, and Figma-integrated design systems. In some cases, development may be custom built, using common front-end frameworks like React.js, Angular, or Vue.js. * Build and maintain reusable components and micro frontends for Guidewires CustomerEngage and EnterpriseEngage portals, as well as other custom or third-party digital platforms. * Integrate digital frontends with Guidewire PolicyCenter, BillingCenter, and ClaimCenter via Cloud APIs and GW Integration Gateway.
        Job title: Digital Developer - Location: London, UK - Job type: Contract (Inside IR35) About the Role You will be responsible for building and customizing digital experiences. This role is ideal for developers who are enthusiastic about modern web technologies, insurance transformation, and agile delivery. What will you do? * Develop and customize digital insurance applications using Guidewire JDP, React.js, and Figma-integrated design systems. In some cases, development may be custom built, using common front-end frameworks like React.js, Angular, or Vue.js. * Build and maintain reusable components and micro frontends for Guidewires CustomerEngage and EnterpriseEngage portals, as well as other custom or third-party digital platforms. * Integrate digital frontends with Guidewire PolicyCenter, BillingCenter, and ClaimCenter via Cloud APIs and GW Integration Gateway.
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        QA Engineer - GxP experience - SaaS - AWS - Outside IR35 - Remote - 6 months - Exalto consulting are currently recruiting for a contract QA Engineer with hands-on experience testing SaaS applications. This is remote working, outside IR35 and initially 6 months. The ideal candidate will contribute to test planning, design, execution, and documentation across frontend and backend systems, ensuring quality, compliance, and reliability in a multi-tenant AWS environment, following GxP - In order to be considered for this role you will need - * 5+ years of experience as a QA Engineer, preferably within health tech/pharma or highly regulated environments or other GxP-regulated SaaS environments. * Understanding of multi-tenant SaaS architecture and AWS core services (EC2, S3, RDS, IAM, Lambda). * Experience testing frontend and backend applications and APIs.
        QA Engineer - GxP experience - SaaS - AWS - Outside IR35 - Remote - 6 months - Exalto consulting are currently recruiting for a contract QA Engineer with hands-on experience testing SaaS applications. This is remote working, outside IR35 and initially 6 months. The ideal candidate will contribute to test planning, design, execution, and documentation across frontend and backend systems, ensuring quality, compliance, and reliability in a multi-tenant AWS environment, following GxP - In order to be considered for this role you will need - * 5+ years of experience as a QA Engineer, preferably within health tech/pharma or highly regulated environments or other GxP-regulated SaaS environments. * Understanding of multi-tenant SaaS architecture and AWS core services (EC2, S3, RDS, IAM, Lambda). * Experience testing frontend and backend applications and APIs.
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        Jira SME - SC Cleared - Onsite - Inside IR35

        The Bridge (IT Recruitment) Limited
        The City, EC3M 3BY
        £575 - 600 per day
        This is a fantastic opportunity to work as a Jira SME on a long term contract, inside IR35. It's important to note that this Jira SME role will require 5 days per week on site in Chippenham and you must have active SC Clearance. * SC Cleared * Defence experience * Provide expertise on Jira Service Management (JSM), Jira Software (JSW), and Confluence * ITSM principles (Incident, Problem, Change, and Request Management). * JSM Automations, Workflows, and Assets (Insight). * Jira Query Language (JQL). * ITIL 4, Agile, or DevOps frameworks. * Familiarity with scripting or automation tools (e.g., PowerShell, Python, or REST APIs). If you do have the relevant experience for this Jira SME role, please do apply.
        This is a fantastic opportunity to work as a Jira SME on a long term contract, inside IR35. It's important to note that this Jira SME role will require 5 days per week on site in Chippenham and you must have active SC Clearance. * SC Cleared * Defence experience * Provide expertise on Jira Service Management (JSM), Jira Software (JSW), and Confluence * ITSM principles (Incident, Problem, Change, and Request Management). * JSM Automations, Workflows, and Assets (Insight). * Jira Query Language (JQL). * ITIL 4, Agile, or DevOps frameworks. * Familiarity with scripting or automation tools (e.g., PowerShell, Python, or REST APIs). If you do have the relevant experience for this Jira SME role, please do apply.
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        4+ years automation testing skills (Selenium, Katalon, GT-UI, GT-API). * Web services testing / API testing skills is a plus.
        4+ years automation testing skills (Selenium, Katalon, GT-UI, GT-API). * Web services testing / API testing skills is a plus.
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        Frequently Asked Questions

        How many contract API jobs are there in Windsor?
        There are 11 contract API jobs within 20 miles of Windsor available on CWJobs right now.

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