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        50 Permanent API jobs in London + 20 miles

        Solution Architect API Integration

        Method-Resourcing
        WD17, Watford
        £85000 - £95000 per annum
        skilled with API development, message buses and languages such as C#, Python, or PHP
        skilled with API development, message buses and languages such as C#, Python, or PHP
        FEATURED

        Integration Architect

        Lynx Recruitment Limited
        SW1W, South West London
        From £85,000 to £100,000 per annum
        Create high-level architectural assets, including API catalogues, application and connectivity models, guiding detailed design - Solid understanding of SOA, REST, and API management principles - Proficient with XSD, XML, XSLT, JSON, API
        Create high-level architectural assets, including API catalogues, application and connectivity models, guiding detailed design - Solid understanding of SOA, REST, and API management principles - Proficient with XSD, XML, XSLT, JSON, API
        more
        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)
        more
        PREMIUM

        Lead Java SDET

        Deerfoot Recruitment Solutions
        The City, EC4N 6JD
        £90000 - £120000 per annum + Benefits + Bonus + Hybrid Working
        Lead SDET | SDET | Software Development Engineer in Test | Test Manager | Test Lead | Lead Test Engineer | Principal Test Engineer | QA Lead | Quality Assurance Lead | Software Test Lead | Automation Lead | Java | Unit Testing | Contract Testing | REST | API | Java OOP | API Testing | Cucumber | Selenium WebDriver | JSON | Performance Testing | Leadership
        Lead SDET | SDET | Software Development Engineer in Test | Test Manager | Test Lead | Lead Test Engineer | Principal Test Engineer | QA Lead | Quality Assurance Lead | Software Test Lead | Automation Lead | Java | Unit Testing | Contract Testing | REST | API | Java OOP | API Testing | Cucumber | Selenium WebDriver | JSON | Performance Testing | Leadership
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        FEATURED
        Perform Dataverse customizations, SQL queries, and CRUD operations using REST/Web API calls. * JavaScript (customizations & API calls)
        Perform Dataverse customizations, SQL queries, and CRUD operations using REST/Web API calls. * JavaScript (customizations & API calls)
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        NEW

        AWS Solutions Architect - AI Startup

        Oscar Associates (UK) Limited
        London
        £70000 - £75000 per annum + benefits
        Join a fast-moving AI startup as our AWS Solutions Architect, where you'll design cloud systems that power cutting-edge AI products. Not just another Architect - forward thinking, we want a creative builder who can scale, secure, and optimise our AWS environment like a pro. * Design and implement AWS architectures for AI workloads * Optimise for speed, scalability, and cost - thinking ahead * Advise on best practices for pipelines, data storage, and APIs * Work side by side with engineering team - devs, data, devops, and CTO to bring big ideas to life * AWS expert with a knack for creative solutions * Loves the startup hustle: agile, fast, hands-on * Infrastrcuture as Code, working in a Devops environment * Confident communicator who can make complex simple - If you want to build the cloud backbone of tomorrow's AI products, get in touch for more info. Keywords -
        Join a fast-moving AI startup as our AWS Solutions Architect, where you'll design cloud systems that power cutting-edge AI products. Not just another Architect - forward thinking, we want a creative builder who can scale, secure, and optimise our AWS environment like a pro. * Design and implement AWS architectures for AI workloads * Optimise for speed, scalability, and cost - thinking ahead * Advise on best practices for pipelines, data storage, and APIs * Work side by side with engineering team - devs, data, devops, and CTO to bring big ideas to life * AWS expert with a knack for creative solutions * Loves the startup hustle: agile, fast, hands-on * Infrastrcuture as Code, working in a Devops environment * Confident communicator who can make complex simple - If you want to build the cloud backbone of tomorrow's AI products, get in touch for more info. Keywords -
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        FEATURED
        Lead Software Engineer - London (Hybrid 1x Per Month) Salary: Up to £100k + Benefits + Stock Options - About Us - Our client is a Insurtech Unicorn looking to expand their engineering team. With the opportunity to work on existing products which have generated millions in revenue to something new changing the landscape of the insurance world, this is the perfect opportunity for a results driven and growth focussed Senior engineer looking to start an ambitious business. The Role - We're seeking a Lead Fullstack Engineer to own the frontend architecture and elevate the B2C user experience across our digital products. This is a high-impact role requiring technical vision, hands-on expertise, and leadership to drive innovation in a rapidly evolving environment. As part of a cross-functional, agile team, you will shape the frontend roadmap, champion best practices, and fos
        Lead Software Engineer - London (Hybrid 1x Per Month) Salary: Up to £100k + Benefits + Stock Options - About Us - Our client is a Insurtech Unicorn looking to expand their engineering team. With the opportunity to work on existing products which have generated millions in revenue to something new changing the landscape of the insurance world, this is the perfect opportunity for a results driven and growth focussed Senior engineer looking to start an ambitious business. The Role - We're seeking a Lead Fullstack Engineer to own the frontend architecture and elevate the B2C user experience across our digital products. This is a high-impact role requiring technical vision, hands-on expertise, and leadership to drive innovation in a rapidly evolving environment. As part of a cross-functional, agile team, you will shape the frontend roadmap, champion best practices, and fos
        more
        NEW

        Principal Software Engineer

        Rise Technical Recruitment Limited
        London
        £100000 - £115000.00 per annum + Progression + Training + Pension
        London (Office Based) £100,000 - £115,000 + Progression + Training - An excellent opportunity awaits an experienced software engineer with strong Java and Python skills for a hands-on technical leadership position within an innovative ML-driven SaaS firm, in a role offering technical growth, variety and strong development opportunities. The company is a profitable and renowned business delivering a cutting-edge AI-driven platform that helps optimise business processes in heavy industries. In this role, you will take on a hands-on technical leadership position focused on the full stack development and management of the platform. You'll manage solution architecture and APIs, data engineering, and the performance of AWS cloud services. As a technical authority within the team, you will provide technical guidance and mentorship to more junior members of the development te
        London (Office Based) £100,000 - £115,000 + Progression + Training - An excellent opportunity awaits an experienced software engineer with strong Java and Python skills for a hands-on technical leadership position within an innovative ML-driven SaaS firm, in a role offering technical growth, variety and strong development opportunities. The company is a profitable and renowned business delivering a cutting-edge AI-driven platform that helps optimise business processes in heavy industries. In this role, you will take on a hands-on technical leadership position focused on the full stack development and management of the platform. You'll manage solution architecture and APIs, data engineering, and the performance of AWS cloud services. As a technical authority within the team, you will provide technical guidance and mentorship to more junior members of the development te
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        PREMIUM

        Front End Developer

        Superb Pa Ltd
        NW9, North West London
        Up to £85,000 per annum
        Are you passionate about turning great design into seamless user experiences? Do you thrive on building interfaces that are as functional as they are beautiful? Our client is looking for aFront-End Developerwho loves working at the intersection of design, technology, and usability. What Youll Do * Build responsive, accessible, and high-quality interfaces with modern frameworks (React, Vue, or Angular). * Bring UX best practices to life, ensuring every interaction feels natural and intuitive. * Contribute to design systems and component libraries that scale across products. * Partner with product managers, designers, and backend engineers to deliver delightful experiences. * Stay ahead of front-end trends, accessibility standards, and UX/UI innovations. What they're Looking For * 4+ yearsof experience in front-end development.
        Are you passionate about turning great design into seamless user experiences? Do you thrive on building interfaces that are as functional as they are beautiful? Our client is looking for aFront-End Developerwho loves working at the intersection of design, technology, and usability. What Youll Do * Build responsive, accessible, and high-quality interfaces with modern frameworks (React, Vue, or Angular). * Bring UX best practices to life, ensuring every interaction feels natural and intuitive. * Contribute to design systems and component libraries that scale across products. * Partner with product managers, designers, and backend engineers to deliver delightful experiences. * Stay ahead of front-end trends, accessibility standards, and UX/UI innovations. What they're Looking For * 4+ yearsof experience in front-end development.
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        Senior Full Stack Engineer

        REVYBE IT RECRUITMENT LIMITED
        EC1, City of London
        From £90,000 to £120,000 per annum + Shares
        London AI Start-up - Up to £120,000 + Shares + Private Healthcare + Pension - Were working with a well-funded AI start-up in London thats gearing up for huge growth. Theyre expecting to scale 10x over the next 18 months. Theyre now looking for a Senior Full-Stack Engineer to help design and build the next generation of their AI-driven platform. Reporting directly into the CTO and collaborating closely with product and research teams, this is a unique chance to take ownership across the stack and make a lasting impact in a company at the forefront of applied AI. The role - This isnt your standard engineering role youll be working end-to-end across frontend, backend, and cloud infrastructure. Youll build sleek, scalable applications with React and Next.js, design and maintain robust APIs with Node.js and Python, and architect solutions deployed on AWS or GCP.
        London AI Start-up - Up to £120,000 + Shares + Private Healthcare + Pension - Were working with a well-funded AI start-up in London thats gearing up for huge growth. Theyre expecting to scale 10x over the next 18 months. Theyre now looking for a Senior Full-Stack Engineer to help design and build the next generation of their AI-driven platform. Reporting directly into the CTO and collaborating closely with product and research teams, this is a unique chance to take ownership across the stack and make a lasting impact in a company at the forefront of applied AI. The role - This isnt your standard engineering role youll be working end-to-end across frontend, backend, and cloud infrastructure. Youll build sleek, scalable applications with React and Next.js, design and maintain robust APIs with Node.js and Python, and architect solutions deployed on AWS or GCP.
        more
        About the Role - We are seeking a Finance Systems Application Support Engineer to join our team on a permanent basis. Acting as the key bridge between our Finance function and IT Systems team, you'll play a central role in supporting, maintaining, and developing finance-related applications-particularly Microsoft Dynamics 365 Finance. This role combines technical expertise with an understanding of finance processes, enabling you to deliver effective first- and second-line support, build reports and workflows, and contribute to wider IT initiatives where finance system expertise is needed. If you're passionate about finance technology and want to drive continuous improvement, this is the opportunity for you. Application Support & Maintenance * Provide technical and functional support for Microsoft Dynamics 365 Finance and related finance systems.
        About the Role - We are seeking a Finance Systems Application Support Engineer to join our team on a permanent basis. Acting as the key bridge between our Finance function and IT Systems team, you'll play a central role in supporting, maintaining, and developing finance-related applications-particularly Microsoft Dynamics 365 Finance. This role combines technical expertise with an understanding of finance processes, enabling you to deliver effective first- and second-line support, build reports and workflows, and contribute to wider IT initiatives where finance system expertise is needed. If you're passionate about finance technology and want to drive continuous improvement, this is the opportunity for you. Application Support & Maintenance * Provide technical and functional support for Microsoft Dynamics 365 Finance and related finance systems.
        more

        Full Stack Developer

        Rise Technical Recruitment Limited
        London
        £70000.00 - £85000.00 per annum + Progression + Training
        London (Office Based) £75,000 - £85,000 + Progression + Training - An excellent opportunity awaits a software engineer with strong Python and Java experience looking to advance their career at an ML-driven SaaS business. This role offers technical growth, variety, and strong development opportunities. The company is a profitable, growing business delivering AI-driven software solutions that optimise business processes in heavy industries. In this role, you'll join a driven and ambitious development team, working across the full stack with Java, Python and Vue.js. You'll manage infrastructure and deployment pipelines, use automation tools, and work with DevOps and cloud technologies (AWS). You will join an autonomous team that values enthusiasm, proactiveness, and training and development. This role is office based, five days per week in the office based in Central Lon
        London (Office Based) £75,000 - £85,000 + Progression + Training - An excellent opportunity awaits a software engineer with strong Python and Java experience looking to advance their career at an ML-driven SaaS business. This role offers technical growth, variety, and strong development opportunities. The company is a profitable, growing business delivering AI-driven software solutions that optimise business processes in heavy industries. In this role, you'll join a driven and ambitious development team, working across the full stack with Java, Python and Vue.js. You'll manage infrastructure and deployment pipelines, use automation tools, and work with DevOps and cloud technologies (AWS). You will join an autonomous team that values enthusiasm, proactiveness, and training and development. This role is office based, five days per week in the office based in Central Lon
        more
        PREMIUM

        AI Developer - Hybrid Remote

        VERTECH GROUP (UK) LTD
        N7, North London
        From £80,000 to £90,000 per annum + Benefits
        AI Developer - Location: 3 days per wk from home / 2 days in London - Salary: Circa 80k 90k + Benefits - AI Developer required byrequired by fast-growing, revolutionary tech company! This is a varied, challenging role in a talented team where youll be responsible for developing scalable backend services that bring their AI vision to life. You dont need to be a machine learning researcher but you do need to know how to integrate modern AI capabilities into productions * At least 4yrs backend development experience * Hands-on experience building AI-powered features * Experience using LLM APIs or open-source models * Solid Node.js expertise * Strong understanding of scalable backend design, REST/GraphQL APIs, and event-driven systems * Able to work with AWS, Docker, and CI/CD pipelines - Tremendous opportunity offering plenty of scope for career progression in a friendly
        AI Developer - Location: 3 days per wk from home / 2 days in London - Salary: Circa 80k 90k + Benefits - AI Developer required byrequired by fast-growing, revolutionary tech company! This is a varied, challenging role in a talented team where youll be responsible for developing scalable backend services that bring their AI vision to life. You dont need to be a machine learning researcher but you do need to know how to integrate modern AI capabilities into productions * At least 4yrs backend development experience * Hands-on experience building AI-powered features * Experience using LLM APIs or open-source models * Solid Node.js expertise * Strong understanding of scalable backend design, REST/GraphQL APIs, and event-driven systems * Able to work with AWS, Docker, and CI/CD pipelines - Tremendous opportunity offering plenty of scope for career progression in a friendly
        more

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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 permanent API jobs are there in London?
        There are 50 permanent API jobs within 20 miles of London available on CWJobs right now.

        Where in London are these permanent jobs?
        You can find permanent jobs in City of London, South West London, East London.

        What other similar jobs are there to permanent API jobs in London?
        As well as permanent API jobs in London, you can find permanent Aws, Python, IT, amongst many others.