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        48 Contract API jobs in Hounslow + 20 miles

        Senior Python Developer

        Experis
        City of London (EC1)
        £500 - £540 per day
        Develop and maintain Python code for data processing, API development, and integration with the Azure Databricks environment.
        Develop and maintain Python code for data processing, API development, and integration with the Azure Databricks environment.
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        FEATURED
        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).
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        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.
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        Strategic Bid Architect / Pre Sales Solution Architect / Bid Solution Architect / Bid Architect - Solutions - This is a pivotal role in shaping, validating, and presenting complex digital, data, and AI-enabled solutions that are commercially competitive, architecturally robust, and operationally deliverable. Acting as the senior solution leader, the role is accountable for designing and governing advanced, cloud-native, and data-driven architectures for strategic, complex, and high-value bids, showcasing our clients digital design ethos and technical excellence. They ensure that all proposals are aligned to customer outcomes, compliant with requirements, and consistent with enterprise standards and delivery capability - delivering winning, sustainable propositions for our client. Working closely with the Growth and Business Development teams from the earliest stages of the ...
        Strategic Bid Architect / Pre Sales Solution Architect / Bid Solution Architect / Bid Architect - Solutions - This is a pivotal role in shaping, validating, and presenting complex digital, data, and AI-enabled solutions that are commercially competitive, architecturally robust, and operationally deliverable. Acting as the senior solution leader, the role is accountable for designing and governing advanced, cloud-native, and data-driven architectures for strategic, complex, and high-value bids, showcasing our clients digital design ethos and technical excellence. They ensure that all proposals are aligned to customer outcomes, compliant with requirements, and consistent with enterprise standards and delivery capability - delivering winning, sustainable propositions for our client. Working closely with the Growth and Business Development teams from the earliest stages of the ...
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        FEATURED
        Senior Java Developer (Contract) Java | Spring Boot | Kafka | Microservices | Kubernetes | AWS - London (Hybrid) | 912 Months | Competitive Day Rate - We are hiring a Senior Java Developer for a long-term contract within a major financial market infrastructure organisation in London. This role is focused on event-driven microservices, Kafka-based architectures, containerised deployments, and high-performance distributed systems. If your experience is primarily CRUD REST APIs without large-scale distributed systems exposure, this role will not be the right fit. Core Requirements (Must Have) * Strong Core Java development (Java 10+) * Extensive Spring Boot experience * Proven Microservices architecture experience * Hands-on Apache Kafka (producers, consumers, topics, partitions) * Experience building event-driven systems * Docker & Kubernetes in production
        Senior Java Developer (Contract) Java | Spring Boot | Kafka | Microservices | Kubernetes | AWS - London (Hybrid) | 912 Months | Competitive Day Rate - We are hiring a Senior Java Developer for a long-term contract within a major financial market infrastructure organisation in London. This role is focused on event-driven microservices, Kafka-based architectures, containerised deployments, and high-performance distributed systems. If your experience is primarily CRUD REST APIs without large-scale distributed systems exposure, this role will not be the right fit. Core Requirements (Must Have) * Strong Core Java development (Java 10+) * Extensive Spring Boot experience * Proven Microservices architecture experience * Hands-on Apache Kafka (producers, consumers, topics, partitions) * Experience building event-driven systems * Docker & Kubernetes in production
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        .NET Developer

        DGH Recruitment
        East London (E1)
        £55000 - £60000 per annum
        .NET Software Engineer - 12 month FTC - An opportunity to join a major transformation programme, building modern, scalable solutions and contributing to a data-driven technology landscape. Role Overview - Working within an agile engineering squad, you will develop new features, build integrations, and support cloud-based platforms using the latest Microsoft technologies. The role includes feature development, system integrations, and contributing to CI/CD, monitoring, and security improvements. Key Responsibilities - Design, develop and maintain reliable .NET solutions (primarily C#). Build features for both internal and external users. Develop integrations across internal systems, third-party tools, and Azure services. Create and maintain CI/CD pipelines (Azure DevOps). Participate in agile ceremonies and collaborate in code reviews.
        .NET Software Engineer - 12 month FTC - An opportunity to join a major transformation programme, building modern, scalable solutions and contributing to a data-driven technology landscape. Role Overview - Working within an agile engineering squad, you will develop new features, build integrations, and support cloud-based platforms using the latest Microsoft technologies. The role includes feature development, system integrations, and contributing to CI/CD, monitoring, and security improvements. Key Responsibilities - Design, develop and maintain reliable .NET solutions (primarily C#). Build features for both internal and external users. Develop integrations across internal systems, third-party tools, and Azure services. Create and maintain CI/CD pipelines (Azure DevOps). Participate in agile ceremonies and collaborate in code reviews.
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        Security Architect

        Morson Edge
        Moorgate, City of London (EC2), EC2Y 9AQ
        £800 - 825 per day
        London (1 day per month - may be more frequent) - £800 - £825 Inside IR35 - Morson Edge have partnered with a major UK retail client to recruit an experienced Security Architect to play a pivotal role in a high-profile Cyber Security Maturity Programme within the CISO function. This a great opportunity to shape and elevate enterprise-wide cyber maturity, influence strategic direction, and drive meaningful, measurable improvements to security resilience across a complex technology estate. You’ll act as a security champion, working at the heart of architecture, engineering, and business teams to embed secure-by-design principles and deliver a forward-looking security architecture that evolves with both business priorities and the threat landscape. What You’ll Be Doing * Lead the design and evolution of target-state security architectures aligned to maturity goals * Drive cyber ...
        London (1 day per month - may be more frequent) - £800 - £825 Inside IR35 - Morson Edge have partnered with a major UK retail client to recruit an experienced Security Architect to play a pivotal role in a high-profile Cyber Security Maturity Programme within the CISO function. This a great opportunity to shape and elevate enterprise-wide cyber maturity, influence strategic direction, and drive meaningful, measurable improvements to security resilience across a complex technology estate. You’ll act as a security champion, working at the heart of architecture, engineering, and business teams to embed secure-by-design principles and deliver a forward-looking security architecture that evolves with both business priorities and the threat landscape. What You’ll Be Doing * Lead the design and evolution of target-state security architectures aligned to maturity goals * Drive cyber ...
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        PREMIUM

        Junior AI Consultant Apprentice

        EXL Service
        The City, City of London (EC3), EC3N 1DD
        Paid Apprenticeship
        EXL (NASDAQ: EXLS)is a global data and artificial intelligence ("AI") company that offers services and solutions to reinvent client business models, drive better outcomes and unlock growth with speed. EXL harnesses the power of data, AI, and deep industry knowledge to transform businesses, including the world's leading corporations in industries including insurance, healthcare and life sciences, banking and capital markets, retail, communications and media, and energy and infrastructure, among others. EXL was founded in 1999 with the core values of innovation, collaboration, excellence, integrity and respect. We are headquartered in New York and have over 65,000 employees spanning six continents. Role Title:Junior AI Consultant Apprentice - BU/Segment:International Growth Markets / AI & Data Solutions - Location:EXL London.
        EXL (NASDAQ: EXLS)is a global data and artificial intelligence ("AI") company that offers services and solutions to reinvent client business models, drive better outcomes and unlock growth with speed. EXL harnesses the power of data, AI, and deep industry knowledge to transform businesses, including the world's leading corporations in industries including insurance, healthcare and life sciences, banking and capital markets, retail, communications and media, and energy and infrastructure, among others. EXL was founded in 1999 with the core values of innovation, collaboration, excellence, integrity and respect. We are headquartered in New York and have over 65,000 employees spanning six continents. Role Title:Junior AI Consultant Apprentice - BU/Segment:International Growth Markets / AI & Data Solutions - Location:EXL London.
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        Skills & Experience - Essential - Demonstrated experience as a Business Analyst in technology focused or IWMS/Facilities Management environments. Strong process analysis and BPMN based modelling skills. Proven ability to analyse system interfaces, data flows, and integration requirements. Understanding of IWMS platforms; experience with Planon is highly desirable. Ability to translate business needs into clear, structured, and actionable documentation. Excellent communication, stakeholder management, and facilitation skills. Key Responsibilities - Process Analysis & Requirements Gathering - Analyse existing processes within the Banks Planon IWMS, documenting current state workflows, business rules, data dependencies, and system interactions. Engage stakeholders to understand operational needs, pain points, and gaps between Planon and the suppliers IWMS.
        Skills & Experience - Essential - Demonstrated experience as a Business Analyst in technology focused or IWMS/Facilities Management environments. Strong process analysis and BPMN based modelling skills. Proven ability to analyse system interfaces, data flows, and integration requirements. Understanding of IWMS platforms; experience with Planon is highly desirable. Ability to translate business needs into clear, structured, and actionable documentation. Excellent communication, stakeholder management, and facilitation skills. Key Responsibilities - Process Analysis & Requirements Gathering - Analyse existing processes within the Banks Planon IWMS, documenting current state workflows, business rules, data dependencies, and system interactions. Engage stakeholders to understand operational needs, pain points, and gaps between Planon and the suppliers IWMS.
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        AI Automation Developer Consultant - London, £550pd

        Langley James Limited
        St James, South West London (SW1), WC2N 5HS
        £525 - £550 per day
        AI Automation Developer Consultant for 6 months to design, develop, and maintain intelligent automation solutions across an Insurance Firm based in the City of London paying upto £550 per day, inside IR35 in a Hybrid role (Predominantly Office based initially and then 3/4 Office Days) . The AI Automation Developer must have a proven track record of actually implementing/delivering AI Automations. The role focuses on leveraging the Microsoft technology stack, including Copilot Enterprise, Power Apps, Azure services, Python, and OpenAI technologies, to streamline workflows, enhance operational efficiency, and support data-driven decision making. The successful candidate will work closely with the Innovations Team, Data, IT, operations, and business stakeholders to identify automation opportunities, implement scalable AI solutions, and ensure strong governance, security, ...
        AI Automation Developer Consultant for 6 months to design, develop, and maintain intelligent automation solutions across an Insurance Firm based in the City of London paying upto £550 per day, inside IR35 in a Hybrid role (Predominantly Office based initially and then 3/4 Office Days) . The AI Automation Developer must have a proven track record of actually implementing/delivering AI Automations. The role focuses on leveraging the Microsoft technology stack, including Copilot Enterprise, Power Apps, Azure services, Python, and OpenAI technologies, to streamline workflows, enhance operational efficiency, and support data-driven decision making. The successful candidate will work closely with the Innovations Team, Data, IT, operations, and business stakeholders to identify automation opportunities, implement scalable AI solutions, and ensure strong governance, security, ...
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        Senior VMware Engineer SC Cleared

        Sanderson Government and Defence
        City of London (EC1), EC1
        £450 - £513 per day
        Position: Senior VMware Engineer - Location: Hybrid / London - Day Rate: £500 p.d inside IR35 - SC Clearance Required - A leading consultancy is supporting a flagship central-government transformation and is looking for a Senior VMware & Automation Engineer to help modernise and automate a large, secure virtual infrastructure estate. This role is ideal for someone who enjoys building reliable automation at scale and wants their work to have national impact. The role - You'll lead automated VM lifecycle management across a complex VMware environment, creating efficient provisioning pipelines and improving how the platform is delivered, secured, and operated. You'll work closely with platform SMEs and engineering teams to ensure consistent, compliant, and high-quality VM operations. Key responsibilities * Build and optimise automated VM provisioning and lifecycle workflows using PowerCLI, ...
        Position: Senior VMware Engineer - Location: Hybrid / London - Day Rate: £500 p.d inside IR35 - SC Clearance Required - A leading consultancy is supporting a flagship central-government transformation and is looking for a Senior VMware & Automation Engineer to help modernise and automate a large, secure virtual infrastructure estate. This role is ideal for someone who enjoys building reliable automation at scale and wants their work to have national impact. The role - You'll lead automated VM lifecycle management across a complex VMware environment, creating efficient provisioning pipelines and improving how the platform is delivered, secured, and operated. You'll work closely with platform SMEs and engineering teams to ensure consistent, compliant, and high-quality VM operations. Key responsibilities * Build and optimise automated VM provisioning and lifecycle workflows using PowerCLI, ...
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        FEATURED

        Java Developer

        Sanderson Government and Defence
        City of London (EC1), EC1
        Up to £550 per day + Inside IR35
        The ideal candidate has strong experience in core Java, modern frameworks, API development, and cloud-based architectures.
        The ideal candidate has strong experience in core Java, modern frameworks, API development, and cloud-based architectures.
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        FEATURED
        Experience integrating UI with RESTful API services.
        Experience integrating UI with RESTful API services.

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        Frequently Asked Questions

        How many contract API jobs are there in Hounslow?
        There are 48 contract API jobs within 20 miles of Hounslow available on CWJobs right now.

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