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        12 Contract API jobs in Windsor + 20 miles

        Data Engineer

        Infoplus Technologies UK Ltd
        Harmondsworth, West Drayton (UB7)
        From £450 to £500 per day
        Strong knowledge of data modeling and API integration.
        Strong knowledge of data modeling and API integration.

        Full Stack Engineer JavaScript

        Staffworx Limited
        West London (W10)
        market rates, outside IR35, 6 months initial, long term extensions
        Design & develop GraphQL API services from schema, supergraph, subgraph design to production integration, ensuring performance, flexibility, and maintainability. * Collaborate in Agile teams, driving API strategy, reviewing pull requests, and improving delivery processes. * Familiarity with testing frameworks (Vitest, Playwright) for both API and end-to-end testing.
        Design & develop GraphQL API services from schema, supergraph, subgraph design to production integration, ensuring performance, flexibility, and maintainability. * Collaborate in Agile teams, driving API strategy, reviewing pull requests, and improving delivery processes. * Familiarity with testing frameworks (Vitest, Playwright) for both API and end-to-end testing.
        more

        CAFM Specialist

        Technical Staffing Resources Limited
        Leatherhead (KT22)
        From £75 to £80 per hour
        Experience of API technologies and writing Restful APIs in JSON
        Experience of API technologies and writing Restful APIs in JSON
        FEATURED

        NSX-T Engineer / Architect SC Cleared

        Sanderson Government and Defence
        Farnborough (GU14), GU14
        £550 - £750 per day
        Position: NSX-T Engineer / Architect - Location: Farnborough - Day Rate: Market Rate - SC Clearance Required - Our defence client is seeking a highly skilled VMware NSX-T Engineer/Architect to play a key role in designing and delivering secure, resilient, and scalable network solutions across mission-critical environments. This is an opportunity to work at the forefront of software-defined networking within a complex, high-security landscape. Key Responsibilities * Lead the design, deployment, and administration of VMware NSX-T, including logical switching, routing, distributed firewalls, and micro- * Architect robust Layer 2/3 network solutions, with deep expertise in BGP, OSPF, STP, VLANs, and trunking. * Implement advanced firewalling and security controls, including segmentation strategies, IDS/IPS, and zero-trust methodologies.
        Position: NSX-T Engineer / Architect - Location: Farnborough - Day Rate: Market Rate - SC Clearance Required - Our defence client is seeking a highly skilled VMware NSX-T Engineer/Architect to play a key role in designing and delivering secure, resilient, and scalable network solutions across mission-critical environments. This is an opportunity to work at the forefront of software-defined networking within a complex, high-security landscape. Key Responsibilities * Lead the design, deployment, and administration of VMware NSX-T, including logical switching, routing, distributed firewalls, and micro- * Architect robust Layer 2/3 network solutions, with deep expertise in BGP, OSPF, STP, VLANs, and trunking. * Implement advanced firewalling and security controls, including segmentation strategies, IDS/IPS, and zero-trust methodologies.
        more
        FEATURED

        Python Developer

        Stackstudio Digital Ltd.
        Wokingham (RG40)
        From £300 to £340 per day
        Role Details - Role / Job Title:Python Developer - Work Location:Wokingham, UK - Mode of Working:Office - The Role - We are seeking an experienced Python Developer with strong expertise in algorithm development, optimization modelling, and power system techno-economic assessment. The ideal candidate will have deep knowledge of Python's core features, data analysis, web frameworks, and modern development practices. Experience with mathematical optimization tools, containerization, and message-queue technologies will be considered a significant advantage. Your Responsibilities - Python Development & Software Engineering - Develop, optimize, and maintain software using core Python features including iterators/generators, exception handling, file handling, type hints, OOP, and data structure design. Build scalable algorithms and write clean, maintainable, and well-structured code.
        Role Details - Role / Job Title:Python Developer - Work Location:Wokingham, UK - Mode of Working:Office - The Role - We are seeking an experienced Python Developer with strong expertise in algorithm development, optimization modelling, and power system techno-economic assessment. The ideal candidate will have deep knowledge of Python's core features, data analysis, web frameworks, and modern development practices. Experience with mathematical optimization tools, containerization, and message-queue technologies will be considered a significant advantage. Your Responsibilities - Python Development & Software Engineering - Develop, optimize, and maintain software using core Python features including iterators/generators, exception handling, file handling, type hints, OOP, and data structure design. Build scalable algorithms and write clean, maintainable, and well-structured code.
        more

        Python Developer

        Infoplus Technologies UK Ltd
        Wokingham, Berkshire
        From £320 to £380 per day
        The Role - We are seeking an experienced Python Developer with strong expertise in algorithm development, optimization modelling, and power system techno-economic assessment. The ideal candidate will have deep knowledge of Pythons core features, data analysis, web frameworks, and modern development practices. Experience with mathematical optimization tools, containerization, and message-queue technologies will be considered a significant advantage. Work from Office - Python Development & Software Engineering - Develop, optimize, and maintain software using core Python features including iterators/generators, exception handling, file handling, type hints, OOP, and data structure design. Build scalable algorithms and write clean, maintainable, and well-structured code. Develop and maintain RESTful APIs using OpenAPI/Swagger, Connexion, or FastAPI.
        The Role - We are seeking an experienced Python Developer with strong expertise in algorithm development, optimization modelling, and power system techno-economic assessment. The ideal candidate will have deep knowledge of Pythons core features, data analysis, web frameworks, and modern development practices. Experience with mathematical optimization tools, containerization, and message-queue technologies will be considered a significant advantage. Work from Office - Python Development & Software Engineering - Develop, optimize, and maintain software using core Python features including iterators/generators, exception handling, file handling, type hints, OOP, and data structure design. Build scalable algorithms and write clean, maintainable, and well-structured code. Develop and maintain RESTful APIs using OpenAPI/Swagger, Connexion, or FastAPI.
        more
        We are proud of our market leading integrations estate, and our Open API capabilities, and continue to build on these with our * Open API for customers, ecosystem partners and Advice firms * Propose and lead on business and partnership models (license, tiered API, embedded UX, or per-event pricing)
        We are proud of our market leading integrations estate, and our Open API capabilities, and continue to build on these with our * Open API for customers, ecosystem partners and Advice firms * Propose and lead on business and partnership models (license, tiered API, embedded UX, or per-event pricing)
        more
        Design, build and govern marketing data foundation tagging, tracking, pipelines and modelling to create a single source of truth across brand direct, paid, social and CRM. Enable faster, better decisions with accurate data, integrated views (GA4, Salesforce, Databricks, COGNOS) and insight products (dashboards, attribution/MMM). Be the primary point of contact for all tracking and data issues ensuring reliability, compliance and speed. Own tagging and tracking standards for web/app (GTM, GA4, CM360/Floodlight, Meta pixel/event manager, consent mode) Define and maintain the marketing KPI dictionary and data model; steward the single source of truth - Define data pipelines between martech platforms and enterprise solutions (Salesforce, COGNOS, Databricks) Set QA/alerting SLAs, prioritise analytics backlog
        Design, build and govern marketing data foundation tagging, tracking, pipelines and modelling to create a single source of truth across brand direct, paid, social and CRM. Enable faster, better decisions with accurate data, integrated views (GA4, Salesforce, Databricks, COGNOS) and insight products (dashboards, attribution/MMM). Be the primary point of contact for all tracking and data issues ensuring reliability, compliance and speed. Own tagging and tracking standards for web/app (GTM, GA4, CM360/Floodlight, Meta pixel/event manager, consent mode) Define and maintain the marketing KPI dictionary and data model; steward the single source of truth - Define data pipelines between martech platforms and enterprise solutions (Salesforce, COGNOS, Databricks) Set QA/alerting SLAs, prioritise analytics backlog
        more
        Location: Reading, UK - Publish Date: 11/12 /2025 - If you apply, please include your CV. Overview - CHAMP Cargosystems provides the most comprehensive range of integrated IT solutions and distribution services for the air cargo transport chain. Our portfolio spans core management systems, messaging services, and eCargo solutions. These include applications designed to meet customs and security requirements, quality optimization, as well as e-freight and mobility needs. Our products and services are recognized globally under the Cargospot and Traxon brands. We serve over 200 airlines and GSAs, connecting them with approximately 3,000 forwarders and GHAs worldwide. Our solutions help customers, and their clients, adapt to the critical and ongoing changes in air transport logistics and meet the demands of global trade.
        Location: Reading, UK - Publish Date: 11/12 /2025 - If you apply, please include your CV. Overview - CHAMP Cargosystems provides the most comprehensive range of integrated IT solutions and distribution services for the air cargo transport chain. Our portfolio spans core management systems, messaging services, and eCargo solutions. These include applications designed to meet customs and security requirements, quality optimization, as well as e-freight and mobility needs. Our products and services are recognized globally under the Cargospot and Traxon brands. We serve over 200 airlines and GSAs, connecting them with approximately 3,000 forwarders and GHAs worldwide. Our solutions help customers, and their clients, adapt to the critical and ongoing changes in air transport logistics and meet the demands of global trade.
        more

        ERP Developer

        Bremont Watch Company Limited
        Henley-On-Thames, Oxfordshire
        Competitive
        This role is focused on the development, optimisation, and ongoing enhancement of our Priority ERP system. As a key member of the Business Systems team, you will take ownership of ERP-related projects and deliver solutions that improve business processes, data integrity, and operational efficiency. Working closely with Business Systems, Finance, Operations, Supply Chain, and other departments, you will be responsible for designing, developing, testing, and maintaining customisations, reports, workflows, and integrations within Priority ERP to support business growth and continuous improvement. * Design, develop, and implement enhancements within the Priority ERP system - o Form Triggers - o Procedures - o Reports - o Documents (HTML and Word formats) o Form Interfaces - o Additional fields within tables and forms
        This role is focused on the development, optimisation, and ongoing enhancement of our Priority ERP system. As a key member of the Business Systems team, you will take ownership of ERP-related projects and deliver solutions that improve business processes, data integrity, and operational efficiency. Working closely with Business Systems, Finance, Operations, Supply Chain, and other departments, you will be responsible for designing, developing, testing, and maintaining customisations, reports, workflows, and integrations within Priority ERP to support business growth and continuous improvement. * Design, develop, and implement enhancements within the Priority ERP system - o Form Triggers - o Procedures - o Reports - o Documents (HTML and Word formats) o Form Interfaces - o Additional fields within tables and forms
        more

        340 exact matches jobs are outside your preferred location

        Akamai L3 SME

        Stackstudio Digital Ltd.
        London
        From £500 to £550 per day
        Manage and optimize Akamai security suites including: WAF, L7 Anti DDoS, Bot Manager Premier, API Security, Site Shield, API Acceleration. Akamai certifications (WAF, DDoS, Bot Manager, API Protector, Site Shield) are a strong plus.
        Manage and optimize Akamai security suites including: WAF, L7 Anti DDoS, Bot Manager Premier, API Security, Site Shield, API Acceleration. Akamai certifications (WAF, DDoS, Bot Manager, API Protector, Site Shield) are a strong plus.
        more

        SIT Test Analyst - PMS

        Hays
        London
        £500.0 - £600.0 per annum + £600 Per Day Inside IR35
        Proficiency in API testing tools (Postman, SOAP UI), SQL for data validation, and test management platforms such as Azure DevOps.
        Proficiency in API testing tools (Postman, SOAP UI), SQL for data validation, and test management platforms such as Azure DevOps.
        more
        Work with .NET (C#), Azure Integration Services (Logic Apps, API Management, Service Bus, Event Grid), and containerised microservices (Docker, AKS). * Champion best practices for API-led connectivity, event-driven architectures, and pub/sub messaging patterns. * Understanding of integration patterns (pub/sub, API-led, event-driven) and security standards (OAuth2, JWT, TLS, API security).
        Work with .NET (C#), Azure Integration Services (Logic Apps, API Management, Service Bus, Event Grid), and containerised microservices (Docker, AKS). * Champion best practices for API-led connectivity, event-driven architectures, and pub/sub messaging patterns. * Understanding of integration patterns (pub/sub, API-led, event-driven) and security standards (OAuth2, JWT, TLS, API security).
        more

        Integration Architect - Boomi

        INFUSED SOLUTIONS LIMITED
        London
        £650 - £750 per day + market rate
        A market leading client is looking for an Integration Architect who has strong Integration experience with Boomi. As an Integration Architect you will shape, design, and deliver modern integration solutions across a diverse enterprise landscape. This is a pivotal role for someone who thrives on solving complex problems, influencing technology direction, and enabling seamless connectivity across systems, data, and business processes. Responsibilities * Analyse business needs and objectives and provide strategic guidance on integration of IT systems. * Excellent Integration experience using Boomi. * Architect and guide integration patterns across Verint, Appian, and other enterprise platforms. * Communicate and present enterprise architecture vision and recommendations to senior management and stakeholders.
        A market leading client is looking for an Integration Architect who has strong Integration experience with Boomi. As an Integration Architect you will shape, design, and deliver modern integration solutions across a diverse enterprise landscape. This is a pivotal role for someone who thrives on solving complex problems, influencing technology direction, and enabling seamless connectivity across systems, data, and business processes. Responsibilities * Analyse business needs and objectives and provide strategic guidance on integration of IT systems. * Excellent Integration experience using Boomi. * Architect and guide integration patterns across Verint, Appian, and other enterprise platforms. * Communicate and present enterprise architecture vision and recommendations to senior management and stakeholders.
        more
        The role requires strong cross module and integration experience, including IDoc, SAP Proxy, and API based integrations, in complex SAP landscapes. Manage and support integrations using IDoc, SAP Proxy, and API (REST/SOAP)
        The role requires strong cross module and integration experience, including IDoc, SAP Proxy, and API based integrations, in complex SAP landscapes. Manage and support integrations using IDoc, SAP Proxy, and API (REST/SOAP)
        more

        Test & AI Evaluation Lead

        MarkIT Placements
        Chilton, Didcot (OX11), OX11
        From £550 to £750 per day depending on experience
        Oversee automated testing across API and service layers, UI (E2E and accessibility), and infrastructure and deployment workflows.
        Oversee automated testing across API and service layers, UI (E2E and accessibility), and infrastructure and deployment workflows.
        more

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        Frequently Asked Questions

        How many contract API jobs are there in Windsor?
        There are 12 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 IT, Software Development, Architecture, amongst many others.