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        300 Permanent API jobs in London + 20 miles

        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.
        As a Software Engineer first, you will have deep expertise in at least one programming language (Python, Node.js, Java, JavaScript, TypeScript, React) and proven experience in productionising GenAI solutions, including integrating LLMs, LangChain, OpenAI API, or Claude.
        As a Software Engineer first, you will have deep expertise in at least one programming language (Python, Node.js, Java, JavaScript, TypeScript, React) and proven experience in productionising GenAI solutions, including integrating LLMs, LangChain, OpenAI API, or Claude.
        more
        Work across core AWS services (e.g., Lambda, DynamoDB, S3, CloudWatch, IAM, API Gateway) to support and extend contact centre functionality. * Hands-on experience with AWS services such as Lambda, S3, IAM, CloudWatch, DynamoDB, API Gateway.
        Work across core AWS services (e.g., Lambda, DynamoDB, S3, CloudWatch, IAM, API Gateway) to support and extend contact centre functionality. * Hands-on experience with AWS services such as Lambda, S3, IAM, CloudWatch, DynamoDB, API Gateway.
        more
        Our client is seeking an experienced Technical Architect with strong expertise in integration architecture, systems design best practice, and API design. * Define security standards for all integration points, including OAuth, API key management, encryption, and network segmentation within an Azure environment. * Advanced knowledge of API implementation, message queues (e.g., Azure Service Bus, Kafka), and event-driven architecture. * Deep expertise in RESTful API design, API gateways (ideally Azure API Management), and the OpenAPI specification.
        Our client is seeking an experienced Technical Architect with strong expertise in integration architecture, systems design best practice, and API design. * Define security standards for all integration points, including OAuth, API key management, encryption, and network segmentation within an Azure environment. * Advanced knowledge of API implementation, message queues (e.g., Azure Service Bus, Kafka), and event-driven architecture. * Deep expertise in RESTful API design, API gateways (ideally Azure API Management), and the OpenAPI specification.
        more
        Automation skills (PowerShell, Graph API) for identity lifecycle and migration tasks.
        Automation skills (PowerShell, Graph API) for identity lifecycle and migration tasks.

        Lead Software Engineer – Azure / .NET

        ARC IT Recruitment Ltd
        South West London (SW1Y)
        £Competitive + 20% bonus + excellent benefits
        Azure, C#, .NET, API * Produce API documentation that adheres to OpenAPI 3.x standards. * Extensive experience in C#, .NET, SQL, and enterprise-grade API design.
        Azure, C#, .NET, API * Produce API documentation that adheres to OpenAPI 3.x standards. * Extensive experience in C#, .NET, SQL, and enterprise-grade API design.
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        Front Office Developer - Technical Team Lead

        CMC Markets UK Plc
        The City, City of London (EC3), EC3A 7BX
        Competitive Salary + Bonus, Pension, Private Health, Life Assurance
        Proven experience designing and developing API-based, microservices-driven architectures.
        Proven experience designing and developing API-based, microservices-driven architectures.
        NEWFEATURED

        AWS DevOps Engineer

        Randstad Digital
        City of London (EC1)
        £55000 - £60000 per annum
        Build, deploy, and monitor solutions using AWS services (Lambda, API Gateway, CloudWatch, ECS, ECR, Dynamo, S3 etc.) * Design, deploy, and manage applications tailored to business needs, while customizing platforms and overseeing the full API lifecycle using Apigee Edge and X. * Drive API strategy execution, provide technical support, and generate insights through analytics to enhance integrations and documentation. * Ability to generate custom analytics reports for API consumption and errors * Implementation of API security and access control (OAuth, API keys, JWT, etc.) * Familiarity with API design patterns, best practices, and performance optimization
        Build, deploy, and monitor solutions using AWS services (Lambda, API Gateway, CloudWatch, ECS, ECR, Dynamo, S3 etc.) * Design, deploy, and manage applications tailored to business needs, while customizing platforms and overseeing the full API lifecycle using Apigee Edge and X. * Drive API strategy execution, provide technical support, and generate insights through analytics to enhance integrations and documentation. * Ability to generate custom analytics reports for API consumption and errors * Implementation of API security and access control (OAuth, API keys, JWT, etc.) * Familiarity with API design patterns, best practices, and performance optimization
        more
        FEATURED

        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
        The role is around 50% Manuel and 50% automation with a mix of UI and API testing. * Perform exploratory and automated testing across API and UI * UI and API automation knowledge
        The role is around 50% Manuel and 50% automation with a mix of UI and API testing. * Perform exploratory and automated testing across API and UI * UI and API automation knowledge
        more

        Technical Writer

        Oscar Associates (UK) Limited
        London
        £40000 - £50000 per annum
        Audit all existing documentation including the Knowledge Base, API references, onboarding flows, and training materials * Identify the purpose of each piece of content and map it to a clear, intuitive documentation structure * Curiosity about how systems work and the confidence to explore API docs, UI flows, and business logic
        Audit all existing documentation including the Knowledge Base, API references, onboarding flows, and training materials * Identify the purpose of each piece of content and map it to a clear, intuitive documentation structure * Curiosity about how systems work and the confidence to explore API docs, UI flows, and business logic
        more

        Cyber Security Architect

        Anson Mccade
        South East London (SE1)
        From £90,000 to £120,000 per annum
        Define and implement application security standards including threat modelling, secure SDLC, API security and DevSecOps practices
        Define and implement application security standards including threat modelling, secure SDLC, API security and DevSecOps practices
        more
        PREMIUM

        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
        Maintain and administer DevOps toolchain components including Git, Artifactory, SonarQube, and API-based scripting solutions. Proficiency in Git, Artifactory, SonarQube, and API scripting.
        Maintain and administer DevOps toolchain components including Git, Artifactory, SonarQube, and API-based scripting solutions. Proficiency in Git, Artifactory, SonarQube, and API scripting.
        more

        AWS DevOps Engineer

        Randstad Digital
        City of London (EC1)
        £55000 - £60000 per annum
        Build, deploy, and monitor solutions using AWS services (Lambda, API customizing platforms and overseeing the full API lifecycle using Apigee Edge and X. Drive API strategy execution, provide technical support, and generate insights - o Ensure API security and access control using OAuth, API keys, JWT, and other - o Strong knowledge of Apigee or similar API Management platforms. o Implement API design patterns, performance optimization, and custom - analytics reporting for API consumption and error tracking.
        Build, deploy, and monitor solutions using AWS services (Lambda, API customizing platforms and overseeing the full API lifecycle using Apigee Edge and X. Drive API strategy execution, provide technical support, and generate insights - o Ensure API security and access control using OAuth, API keys, JWT, and other - o Strong knowledge of Apigee or similar API Management platforms. o Implement API design patterns, performance optimization, and custom - analytics reporting for API consumption and error tracking.
        more
        FEATURED

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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 300 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, Central London, South 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 Qa Automation, Quality Assurance, QA Analyst, amongst many others.