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        204 Contract API jobs in London + 20 miles

        TypeScript Developer Full Stack - Fintech

        Client Server
        Shoreditch, East London (E1), EC2A
        £50000 - £60000 per annum + benefits
        TypeScript Developer / Engineer (Full Stack API React) London / WFH to £60k - Apply now to find out more about this TypeScript Developer / Engineer (Full Stack API React) opportunity.
        TypeScript Developer / Engineer (Full Stack API React) London / WFH to £60k - Apply now to find out more about this TypeScript Developer / Engineer (Full Stack API React) opportunity.
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        PREMIUM

        QA - Lead Automation Architect

        Anson Mccade
        North West London (NW1)
        £85,000 - £110,000 Annual
        Champion best practices across testing disciplines including unit, integration, UI, API, and performance * Knowledge of web, mobile, API/microservices testing and contract testing (e.g. PACT)
        Champion best practices across testing disciplines including unit, integration, UI, API, and performance * Knowledge of web, mobile, API/microservices testing and contract testing (e.g. PACT)
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        PREMIUM
        The successful candidate will demonstrate significant expertise in Microsoft Azure services, Web API, Azure App Service, .NET Core, and Visual Studio. * Design and implement scalable technology solutions using Web API, Azure App Service, and .NET Core to satisfy business requirements and enhance operational efficiency. * Define architectural patterns for microservices and API management. Azure API Development * Develop and maintain APIs using Azure API Management, Web API, and .NET Core to enable secure and efficient integrations. * Ensure API performance, security, and compliance with best practices. * Monitor and optimize application and API performance using Azure Monitor, Application Insights, and Log Analytics. * Expertise in Mic
        The successful candidate will demonstrate significant expertise in Microsoft Azure services, Web API, Azure App Service, .NET Core, and Visual Studio. * Design and implement scalable technology solutions using Web API, Azure App Service, and .NET Core to satisfy business requirements and enhance operational efficiency. * Define architectural patterns for microservices and API management. Azure API Development * Develop and maintain APIs using Azure API Management, Web API, and .NET Core to enable secure and efficient integrations. * Ensure API performance, security, and compliance with best practices. * Monitor and optimize application and API performance using Azure Monitor, Application Insights, and Log Analytics. * Expertise in Mic
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        Senior .Net Integration Developer

        Rise Technical
        Maidenhead, Berkshire
        £50000.00 - £70000.00 per annum + + Training + Holiday
        You will use your expertise in C#/.NET and modern APIs (REST, WebAPI, JSON, OAuth2) to build fault-tolerant, event-driven integrations, support customers and partners with API usage, and deliver clear, high-quality documentation while maintaining security, GDPR compliance, and operational reliability. Taking integration leadership, you will design and maintain well-documented financial and third-party integrations built on modern API standards. * Support customers and partners with integration setup and API usage
        You will use your expertise in C#/.NET and modern APIs (REST, WebAPI, JSON, OAuth2) to build fault-tolerant, event-driven integrations, support customers and partners with API usage, and deliver clear, high-quality documentation while maintaining security, GDPR compliance, and operational reliability. Taking integration leadership, you will design and maintain well-documented financial and third-party integrations built on modern API standards. * Support customers and partners with integration setup and API usage
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        Translate complex business requirements into detailed technical specifications, architectural designs, and API contracts. o Create and maintain comprehensive technical documentation, including code documentation, system designs, and API specifications. o 5+ years of experience in software development, with significant experience in cloud-based application development and API design. o Familiarity with cloud services relevant to application development (e.g., Azure Webapps, Azure Functions, Azure API Management, Azure Cosmos DB, Azure Databricks, Azure ML services for model consumption).
        Translate complex business requirements into detailed technical specifications, architectural designs, and API contracts. o Create and maintain comprehensive technical documentation, including code documentation, system designs, and API specifications. o 5+ years of experience in software development, with significant experience in cloud-based application development and API design. o Familiarity with cloud services relevant to application development (e.g., Azure Webapps, Azure Functions, Azure API Management, Azure Cosmos DB, Azure Databricks, Azure ML services for model consumption).
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        JNC are working with a leading Insurance client that are looking for an established Technical Architect who specialises in integration architecture, system design and API design within the insurance market. * Extensive experience with API implementations, Message Queues and Event Driven Architecture. * Expert skills with RESTful API design and API Gateway management.
        JNC are working with a leading Insurance client that are looking for an established Technical Architect who specialises in integration architecture, system design and API design within the insurance market. * Extensive experience with API implementations, Message Queues and Event Driven Architecture. * Expert skills with RESTful API design and API Gateway management.
        more
        Operating in a rapidly evolving logistics sector, they will leverage cutting-edge Azure PaaS technologies (App Services, Functions, API Management, etc.) to drive efficiency, reliability, and innovation across high-impact national projects. * Experience with microservices architecture and API Management.
        Operating in a rapidly evolving logistics sector, they will leverage cutting-edge Azure PaaS technologies (App Services, Functions, API Management, etc.) to drive efficiency, reliability, and innovation across high-impact national projects. * Experience with microservices architecture and API Management.
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        TM Forum SOM Architect

        Stackstudio Digital Ltd.
        Windsor (SL4)
        From £425 to £450 per day
        Act as the champion for TMF ODA and Open API principles across Energy Services Platform. Strong experience designing and implementing solutions using TM Forum Open APIs and a deep understanding of the ODA and Open API frameworks - Proficiency in RESTful API design, JSON, OpenAPI/Swagger specifications, microservices architecture, and cloud-native deployment models (Docker, Kubernetes, public/hybrid cloud platforms)
        Act as the champion for TMF ODA and Open API principles across Energy Services Platform. Strong experience designing and implementing solutions using TM Forum Open APIs and a deep understanding of the ODA and Open API frameworks - Proficiency in RESTful API design, JSON, OpenAPI/Swagger specifications, microservices architecture, and cloud-native deployment models (Docker, Kubernetes, public/hybrid cloud platforms)
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        Senior Backend Engineer

        Plexus Resource Solutions Ltd
        City of London (EC1)
        Unspecified
        Skilled in building robust, optimized API endpoints.
        Skilled in building robust, optimized API endpoints.
        NEW

        Full Stack Developer

        167 Solutions Ltd
        North West London (NW1)
        From £200 to £300 per annum
        We are looking for a strong Full Stack Developer to deliver a short-term project involving a static website build, API scraping, and structured JSON output. * Develop API scraping scripts to extract structured data reliably * Proven experience building API scrapers (Axios, Puppeteer, BeautifulSoup, Cheerio, or similar) * Knowledge of API rate limits and bypass methods
        We are looking for a strong Full Stack Developer to deliver a short-term project involving a static website build, API scraping, and structured JSON output. * Develop API scraping scripts to extract structured data reliably * Proven experience building API scrapers (Axios, Puppeteer, BeautifulSoup, Cheerio, or similar) * Knowledge of API rate limits and bypass methods
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        3 or more years' experience of technical testing micro services solutions, at a service and API layer specifically * Hands-on understanding and experience with API testing * Ability to develop functional tests, which exercise the UI, API and DB layer
        3 or more years' experience of technical testing micro services solutions, at a service and API layer specifically * Hands-on understanding and experience with API testing * Ability to develop functional tests, which exercise the UI, API and DB layer
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        FEATURED

        Backend Developer .NET

        Adroit People Ltd
        The City, City of London (EC2), EC2N 1HQ
        From £400 to £425 per day
        Work with Service Bus, Azure SQL, API Management, and Key Vault to deliver robust, secure, and scalable solutions. * Collaborate with front-end engineers to ensure efficient API design and cohesive end-to-end workflows. * Strong experience with Azure, including Container Apps, Functions, Service Bus, Networking and API Management.
        Work with Service Bus, Azure SQL, API Management, and Key Vault to deliver robust, secure, and scalable solutions. * Collaborate with front-end engineers to ensure efficient API design and cohesive end-to-end workflows. * Strong experience with Azure, including Container Apps, Functions, Service Bus, Networking and API Management.
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        This role will require knowledge of MuleSoft's Anypoint Studio & Anypoint Platform, which includes Design Center, Runtime Manager, API Manager, Exchange, etc. * MuleSoft Anypoint Platform & components (Mule ESB, API Manager, CloudHub, etc.) * API design and development. * Familiarity with API design & development best practices
        This role will require knowledge of MuleSoft's Anypoint Studio & Anypoint Platform, which includes Design Center, Runtime Manager, API Manager, Exchange, etc. * MuleSoft Anypoint Platform & components (Mule ESB, API Manager, CloudHub, etc.) * API design and development. * Familiarity with API design & development best practices
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        FEATURED

        .NET Developer

        Rise Technical
        London
        £60000.00 - £70000.00 per annum
        Excellent opportunity for an experienced .NET Backend Developer to join a rapidly growing business in London, where you will play a key role in shaping the backend systems, API architecture, and cloud infrastructure that support the company's technology roadmap.
        Excellent opportunity for an experienced .NET Backend Developer to join a rapidly growing business in London, where you will play a key role in shaping the backend systems, API architecture, and cloud infrastructure that support the company's technology roadmap.
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        What is the average salary for API in London?

        Average salary per year
        £72,499

        The average salary for a API in London is £72,499. API in London salaries range from £62,499 to £87,499.

        Frequently Asked Questions

        How many contract API jobs are there in London?
        There are 204 contract API jobs within 20 miles of London available on CWJobs right now.

        Where in London are these contract jobs?
        You can find contract jobs in City of London, Central London, West End.

        What other similar jobs are there to contract API jobs in London?
        As well as contract API jobs in London, you can find contract Qa Automation, Quality Assurance, QA Analyst, amongst many others.