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        Last 14 days
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        105 Contract API jobs in Osterley + 20 miles

        400 exact matches jobs are outside your preferred location

        Lead Integration Engineer

        Develop
        London
        £450 - £500 per day
        Strong experience with RESTful API integrations * Familiarity with authentication protocols (OAuth2, API keys)
        Strong experience with RESTful API integrations * Familiarity with authentication protocols (OAuth2, API keys)
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        NEW

        Lead AI Engineer

        Change-IT Consulting Ltd
        London
        From £700 to £750 per day
        Familiarity with tools for working with Large Language Models via API or in a local context (e.g. HuggingFace transformers).
        Familiarity with tools for working with Large Language Models via API or in a local context (e.g. HuggingFace transformers).
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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
        Deliver front-end excellence: Build fast, responsive web apps using Vite, React Query, Context API, and CSS frameworks. * Design for scale: Lead on API design, performance optimisation, and secure, cloud-ready architectures.
        Deliver front-end excellence: Build fast, responsive web apps using Vite, React Query, Context API, and CSS frameworks. * Design for scale: Lead on API design, performance optimisation, and secure, cloud-ready architectures.
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        NEW

        Lead .Net Software Developer

        Hireful
        Milton Keynes, Buckinghamshire
        £65k - £75k base + Bonus
        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
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        NEWFEATURED

        IT Project Engineer

        Networking People (UK) Limited
        London
        £50000 - £70000 per annum + + benefits
        Advanced automation experience using PowerShell, Graph API, or Azure Automation for large-scale management and orchestration.
        Advanced automation experience using PowerShell, Graph API, or Azure Automation for large-scale management and orchestration.
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        NEW
        A Developer with experience in .NET, C#, and JavaScript is urgently required to join a dynamic and innovative team in a leading organisation working on a fully remote basis. This is an excellent opportunity to contribute to technological developments, streamline processes, and enhance operational efficiency. The Role - As a Developer, you will work closely with the Senior Developer to design and implement internal tools and solutions. Collaborating with various departments, you’ll support development-related queries and build integrations with third-party platforms via APIs. This role is central to improving workflows, enabling innovative practices, and contributing to the company’s technology strategy. The Company - Our client is a forward-thinking organisation committed to technological advancement and efficiency.
        A Developer with experience in .NET, C#, and JavaScript is urgently required to join a dynamic and innovative team in a leading organisation working on a fully remote basis. This is an excellent opportunity to contribute to technological developments, streamline processes, and enhance operational efficiency. The Role - As a Developer, you will work closely with the Senior Developer to design and implement internal tools and solutions. Collaborating with various departments, you’ll support development-related queries and build integrations with third-party platforms via APIs. This role is central to improving workflows, enabling innovative practices, and contributing to the company’s technology strategy. The Company - Our client is a forward-thinking organisation committed to technological advancement and efficiency.
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        NEW

        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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        NEW
        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
        Contract Java Developer (Inside IR35) | SC Cleared - We are seeking a highly skilled Contract Java Developer with active SC Clearance to join a critical project on a long-term contract. This is a crucial role for a candidate who can hit the ground running and contribute to a significant public sector programme. Key Information * IR35 Status: Inside IR35 * Duration: 6-12 month initial contract * Location: Remote, with required travel to London once a month. * Security Clearance: You must hold an active SC Clearance. The Role - You will be a key member of a development team, responsible for designing and implementing high-performance back-end services. This role requires deep technical expertise and a proactive approach to problem-solving. You will be working with a modern tech stack to deliver a new solution for a high-profile client. Required Skills & Experience
        Contract Java Developer (Inside IR35) | SC Cleared - We are seeking a highly skilled Contract Java Developer with active SC Clearance to join a critical project on a long-term contract. This is a crucial role for a candidate who can hit the ground running and contribute to a significant public sector programme. Key Information * IR35 Status: Inside IR35 * Duration: 6-12 month initial contract * Location: Remote, with required travel to London once a month. * Security Clearance: You must hold an active SC Clearance. The Role - You will be a key member of a development team, responsible for designing and implementing high-performance back-end services. This role requires deep technical expertise and a proactive approach to problem-solving. You will be working with a modern tech stack to deliver a new solution for a high-profile client. Required Skills & Experience
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        FEATURED

        ESRI GIS Subject Matter Expert (SME)

        Stackstudio Digital Ltd.
        RG40, Wokingham
        From £400 to £450 per day
        Role/Job Title: ESRI GIS Subject Matter Expert (SME) Work Location: Wokingham - If Hybrid, Days Required in Office: 3 days a week - The Role - We are seeking an experienced ESRI GIS Subject Matter Expert (SME) to lead the design, implementation, and optimization of a scalable GIS platform that supports strategic spatial energy planning. The platform will enable environmental impact assessments, economic modelling, and the integration of community preferences. The SME will be responsible for consolidating and migrating diverse spatial datasets into a unified system, ensuring data accuracy, quality, and accessibility, while supporting secure, role-based access, automation, and interoperability with internal and external systems. Your Responsibilities - Platform Design & Implementation * Architect and deploy a scalable ESRI-based GIS platform (ArcGIS Enterprise, ArcGIS O
        Role/Job Title: ESRI GIS Subject Matter Expert (SME) Work Location: Wokingham - If Hybrid, Days Required in Office: 3 days a week - The Role - We are seeking an experienced ESRI GIS Subject Matter Expert (SME) to lead the design, implementation, and optimization of a scalable GIS platform that supports strategic spatial energy planning. The platform will enable environmental impact assessments, economic modelling, and the integration of community preferences. The SME will be responsible for consolidating and migrating diverse spatial datasets into a unified system, ensuring data accuracy, quality, and accessibility, while supporting secure, role-based access, automation, and interoperability with internal and external systems. Your Responsibilities - Platform Design & Implementation * Architect and deploy a scalable ESRI-based GIS platform (ArcGIS Enterprise, ArcGIS O
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        NEW

        Software Engineer (Full Stack Python, AI, LLMs) - London Hybird

        Transparent Technology
        London, EC1A 4RN
        £80000 - £135000 per annum + + bens + shares
        Senior Software Engineer (AI Focus) - £80k-£135k + Benefits + Shares | London (Hybrid, 3 Days/Week) We're working with a leading AI consultancy - one of only four global partners of OpenAI - to hire talented Software Engineers (backend or full stack) to join their London team. You don't need to be a productionising AI/LLM expert already, they'll teach that. What matters is strong, hands-on software engineering experience and a passion for building scalable systems. * Build and deploy scalable agentic applications in Python (and ideally JavaScript/TypeScript) * Design and maintain microservices, APIs, and CI/CD pipelines * Work on multiple cloud platforms (AWS, GCP, or Azure) * Collaborate with AI specialists to deliver next-gen solutions * Stay hands-on coding daily (even at senior levels) * Strong software engineering background (backend or full stack)
        Senior Software Engineer (AI Focus) - £80k-£135k + Benefits + Shares | London (Hybrid, 3 Days/Week) We're working with a leading AI consultancy - one of only four global partners of OpenAI - to hire talented Software Engineers (backend or full stack) to join their London team. You don't need to be a productionising AI/LLM expert already, they'll teach that. What matters is strong, hands-on software engineering experience and a passion for building scalable systems. * Build and deploy scalable agentic applications in Python (and ideally JavaScript/TypeScript) * Design and maintain microservices, APIs, and CI/CD pipelines * Work on multiple cloud platforms (AWS, GCP, or Azure) * Collaborate with AI specialists to deliver next-gen solutions * Stay hands-on coding daily (even at senior levels) * Strong software engineering background (backend or full stack)
        more
        NEW

        Camunda Developer

        Stott & May Professional Search Limited
        London
        £340 - £382.50 per day
        Location: London (Hybrid - 2-3 days on-site) Duration: Until 31st December 2026 - Day Rate: £382.50 (Inside IR35) About the Role - We are seeking an experienced Camunda Developer to design, develop, and deploy business process automation solutions using the Camunda BPM platform. This role is pivotal in building scalable, process-driven applications that streamline business workflows and decision-making. You will collaborate closely with business analysts, architects, and developers to deliver high-quality workflow orchestration solutions. This long-term contract offers the opportunity to work on large-scale digital transformation initiatives within a secure environment. Key Responsibilities - Design and implement BPMN workflows and DMN decision tables using Camunda. Develop custom Java delegates and external task workers.
        Location: London (Hybrid - 2-3 days on-site) Duration: Until 31st December 2026 - Day Rate: £382.50 (Inside IR35) About the Role - We are seeking an experienced Camunda Developer to design, develop, and deploy business process automation solutions using the Camunda BPM platform. This role is pivotal in building scalable, process-driven applications that streamline business workflows and decision-making. You will collaborate closely with business analysts, architects, and developers to deliver high-quality workflow orchestration solutions. This long-term contract offers the opportunity to work on large-scale digital transformation initiatives within a secure environment. Key Responsibilities - Design and implement BPMN workflows and DMN decision tables using Camunda. Develop custom Java delegates and external task workers.
        more
        NEW

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        Frequently Asked Questions

        How many contract API jobs are there in Osterley?
        There are 105 contract API jobs within 20 miles of Osterley available on CWJobs right now.

        Where in Osterley are these contract jobs?
        You can find contract jobs in Southwark, The City, City (EC2), The City, City (EC3).

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