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        93 Permanent API jobs in City of London + 20 miles

        Client Server

        C# Developer .Net SQL API

        Client Server
        The City, City of London (EC4), EC4R
        £75000 - £90000 per annum + benefits
        C# Developer / Software Engineer (C# .Net SQL API) London onsite to £90k - There's a focus on backend and API development although you'll also have elements of front end work with JavaScript and React.js. Apply now to find out more about this C# Developer / Software Engineer (C# .Net SQL API) opportunity.
        C# Developer / Software Engineer (C# .Net SQL API) London onsite to £90k - There's a focus on backend and API development although you'll also have elements of front end work with JavaScript and React.js. Apply now to find out more about this C# Developer / Software Engineer (C# .Net SQL API) opportunity.
        more
        PREMIUM
        Client Server

        C++ Developer MacOS API

        Client Server
        The City, City of London (EC4), EC2V
        £65000 - £80000 per annum + benefits
        As a C++ Developer you will focus on enabling the core product, written in C / C++ for Windows and Linux to run on Apple Mac software, using the latest Extensions, tools and API integrations.
        As a C++ Developer you will focus on enabling the core product, written in C / C++ for Windows and Linux to run on Apple Mac software, using the latest Extensions, tools and API integrations.
        more
        PREMIUM
        ARC IT Recruitment Ltd

        Tech Lead – Azure / .NET

        ARC IT Recruitment Ltd
        The City, City of London (EC4), EC4N
        Up to £100,000 per annum c.20% bonus + excellent benefits
        This role sits within a core backend and API-focused team responsible for internal platforms that directly support commercial operations. * Act as the technical lead for a backend/API team supporting real-time, high-availability systems * Strong commercial experience with C# and .NET in backend, API-driven systems
        This role sits within a core backend and API-focused team responsible for internal platforms that directly support commercial operations. * Act as the technical lead for a backend/API team supporting real-time, high-availability systems * Strong commercial experience with C# and .NET in backend, API-driven systems
        more
        Technically Gifted Ltd

        Martech Product Owner (iGaming)

        Technically Gifted Ltd
        City of London (EC1V)
        From £70,000 to £80,000 per annum
        Ensure scalable, resilient API integration between MarTech tools, the Bonus Engine, product systems, and data warehouses - Define and manage the Bonus Engine roadmap, evolving API capabilities and reward mechanics to support campaign efficiency and player engagement.
        Ensure scalable, resilient API integration between MarTech tools, the Bonus Engine, product systems, and data warehouses - Define and manage the Bonus Engine roadmap, evolving API capabilities and reward mechanics to support campaign efficiency and player engagement.
        more
        Henderson Scott

        Director of Technology Architecture and Data

        Henderson Scott
        North West London, London, NW1 7AW
        £125000 - £135000 per annum + Hybrid, 30 Days AL,
        Oversee cloud architecture (primarily Microsoft Azure), integration patterns, and API frameworks. * API management, data architecture, integration patterns
        Oversee cloud architecture (primarily Microsoft Azure), integration patterns, and API frameworks. * API management, data architecture, integration patterns
        more
        FEATURED
        Crimson Ltd

        Technical Development Lead - Enfield, London

        Crimson Ltd
        Enfield, London
        £65000 - £80000 per annum
        Design and implement Service-Oriented Architecture, API gateways, and scalable integration strategies. * Expert in JavaScript, API protocols, message queuing, and synchronising data across POS, WMS, CRM, and loyalty systems.
        Design and implement Service-Oriented Architecture, API gateways, and scalable integration strategies. * Expert in JavaScript, API protocols, message queuing, and synchronising data across POS, WMS, CRM, and loyalty systems.
        more
        Crimson

        Technical Development Lead - Enfield, London

        Crimson
        Enfield (EN1)
        £65000 - £80000 per annum
        Design and implement Service-Oriented Architecture, API gateways, and scalable integration strategies. * Expert in JavaScript, API protocols, message queuing, and synchronising data across POS, WMS, CRM, and loyalty systems.
        Design and implement Service-Oriented Architecture, API gateways, and scalable integration strategies. * Expert in JavaScript, API protocols, message queuing, and synchronising data across POS, WMS, CRM, and loyalty systems.
        more
        Smart Sourcer Limited

        Senior Automated & Manual Tester – Mobile, Playwright, C#, SQL, Azure

        Smart Sourcer Limited
        City of London (EC1)
        From £70,000 to £75,000 per annum + 10% bonus + excellent benefits
        Hands-on experience with Playwright or similar automation tools (e.g. Selenium) with extensive experience enhancing automated test frameworks for UI & API testing * Maintaining and enhancing UI/API test frameworks (e.g., Selenium, Playwright)
        Hands-on experience with Playwright or similar automation tools (e.g. Selenium) with extensive experience enhancing automated test frameworks for UI & API testing * Maintaining and enhancing UI/API test frameworks (e.g., Selenium, Playwright)
        more
        Loopla

        Full Stack Developer

        Loopla
        Euston, North West London (NW1), NW1 2RT
        Competitive
        Vitest/Jest, Docker, CI/CD (GitHub Actions), Shadcn/MUI, MongoDB, microservices, Cloudflare/CDNs, Firebase, Google Maps API, startup experience.
        Vitest/Jest, Docker, CI/CD (GitHub Actions), Shadcn/MUI, MongoDB, microservices, Cloudflare/CDNs, Firebase, Google Maps API, startup experience.
        more
        Bilge Adam Technologies UK Ltd

        Software Architect

        Bilge Adam Technologies UK Ltd
        Central London (WC1)
        From £75,000 to £90,000 per annum
        Job description - Job Role: Software/Solution Architect - We are looking to hire an experienced Software Architect. What Youll Be Doing - Youll play a key role in shaping how modern software platforms are designed, integrated, and scaled. * Designing and defining end-to-end Software Architecture * Building scalable, modular, secure platforms * Guiding developers with best practices and architectural patterns * Leading integration between cloud services, APIs, and (at times) connectivity components like telematics or infotainment * Improving performance, security, and long-term maintainability * Collaborating closely with Product and operations teams. This is a role where your technical decisions genuinely shape the future of the product. Who Were Looking For - Someone who is having software architecture experience , thinks in systems, and enjoys working with both high
        Job description - Job Role: Software/Solution Architect - We are looking to hire an experienced Software Architect. What Youll Be Doing - Youll play a key role in shaping how modern software platforms are designed, integrated, and scaled. * Designing and defining end-to-end Software Architecture * Building scalable, modular, secure platforms * Guiding developers with best practices and architectural patterns * Leading integration between cloud services, APIs, and (at times) connectivity components like telematics or infotainment * Improving performance, security, and long-term maintainability * Collaborating closely with Product and operations teams. This is a role where your technical decisions genuinely shape the future of the product. Who Were Looking For - Someone who is having software architecture experience , thinks in systems, and enjoys working with both high
        more

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        What is the average salary for API in City of London?

        Average salary per year
        £82,499
        The average salary for a API in City of London is £82,499. API in City of London salaries range from £64,999 to £92,499.

        Frequently Asked Questions

        How many permanent API jobs are there in City of London?
        There are 93 permanent API jobs within 20 miles of City of London available on CWJobs right now.
        What other similar jobs are there to permanent API jobs in City of London?
        As well as permanent API jobs in City of London, you can find permanent IT, Software Development, Architecture, amongst many others.