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        57 Permanent API jobs in London + 20 miles

        Test Engineer (SFIA4)

        Zaizi LTD
        London
        £56,000 - £70,000 a year
        Design and build Automation from scratch, Web Services/API , Performance & Accessibility test frameworks with DevOps CI/CD * API testing with Rest Assured or Postman
        Design and build Automation from scratch, Web Services/API , Performance & Accessibility test frameworks with DevOps CI/CD * API testing with Rest Assured or Postman
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        Were looking for an experienced Engineering Lead to join our API Experience team. Youll lead and manage a team of engineers building the tooling and infrastructure that enables partners to securely integrate with Wise's API. * Well-Tooled: Own the development of our self-service developer portal, streamlining processes for credential management and API monitoring.
        Were looking for an experienced Engineering Lead to join our API Experience team. Youll lead and manage a team of engineers building the tooling and infrastructure that enables partners to securely integrate with Wise's API. * Well-Tooled: Own the development of our self-service developer portal, streamlining processes for credential management and API monitoring.
        more
        We deliver the industrys most advanced platform for Any API, Any Event, and Any AI Agent , trusted by global leaders like Michelin, Roche, and Blue Yonder. * The Mission : We are the first to bridge traditional API Management with the new frontier of AI Agent Security - As an Engineering Manage r , you will lead engineering teams building the next generation of API infrastructure. * Experience and understanding of architecture principles across infrastructure platforms, API, security, data, integration, and application layers
        We deliver the industrys most advanced platform for Any API, Any Event, and Any AI Agent , trusted by global leaders like Michelin, Roche, and Blue Yonder. * The Mission : We are the first to bridge traditional API Management with the new frontier of AI Agent Security - As an Engineering Manage r , you will lead engineering teams building the next generation of API infrastructure. * Experience and understanding of architecture principles across infrastructure platforms, API, security, data, integration, and application layers
        more
        We deliver the industrys most advanced platform for Any API, Any Event, and Any AI Agent , trusted by global leaders like Michelin, Roche, and Blue Yonder. * The Mission : We are the first to bridge traditional API Management with the new frontier of AI Agent Security
        We deliver the industrys most advanced platform for Any API, Any Event, and Any AI Agent , trusted by global leaders like Michelin, Roche, and Blue Yonder. * The Mission : We are the first to bridge traditional API Management with the new frontier of AI Agent Security
        more
        The organisations website operates on a headless architecture using Contentful CMS, with the front-end hosted on Vercel, and integrates with CRM, analytics, and internal systems through API-driven services. Design and implement API-driven integrations between core systems including CRM, website platforms, marketing tools, analytics environments, and internal databases, ensuring systems operate as a connected digital ecosystem. * Experience building API-driven integrations between enterprise platforms including CRM systems, web platforms, marketing systems, and analytics environments.
        The organisations website operates on a headless architecture using Contentful CMS, with the front-end hosted on Vercel, and integrates with CRM, analytics, and internal systems through API-driven services. Design and implement API-driven integrations between core systems including CRM, website platforms, marketing tools, analytics environments, and internal databases, ensuring systems operate as a connected digital ecosystem. * Experience building API-driven integrations between enterprise platforms including CRM systems, web platforms, marketing systems, and analytics environments.
        more
        Mentor engineers in secure-by-design patterns, client-side security, and secure API design. * Experience with developing and maintaining web-focused tooling and automation (Burp extensions, custom scanners, authenticated API fuzzers, GraphQL mutation explorers, Puppeteer/Playwright scripts).
        Mentor engineers in secure-by-design patterns, client-side security, and secure API design. * Experience with developing and maintaining web-focused tooling and automation (Burp extensions, custom scanners, authenticated API fuzzers, GraphQL mutation explorers, Puppeteer/Playwright scripts).
        more
        Need to lead the delivery of enterprise-ready back-of-the-frontend work (e.g. state management, API integration or data architecture)for that, youll have Product Engineers to collaborate with.
        Need to lead the delivery of enterprise-ready back-of-the-frontend work (e.g. state management, API integration or data architecture)for that, youll have Product Engineers to collaborate with.
        more
        Clio is the global leader in legal AI technology, empowering legal professionals and law firms of every size to work smarter, faster, and more securely. We are transforming the legal experience for all by bettering the lives of legal professionals while increasing access to justice. As a Senior Forward Deployed Engineer, you'll sit at the intersection of engineering and client impact, the person who turns the legal industrys most complex challenges into working software. You'll embed with our most demanding clients, move from prototype to production quickly, and feed what you learn back into our platform and roadmap. This isn't a support role or a solutions role with some coding on the side. You'll design and build end-to-end, work directly with client technical teams, and ship code that real lawyers rely on.
        Clio is the global leader in legal AI technology, empowering legal professionals and law firms of every size to work smarter, faster, and more securely. We are transforming the legal experience for all by bettering the lives of legal professionals while increasing access to justice. As a Senior Forward Deployed Engineer, you'll sit at the intersection of engineering and client impact, the person who turns the legal industrys most complex challenges into working software. You'll embed with our most demanding clients, move from prototype to production quickly, and feed what you learn back into our platform and roadmap. This isn't a support role or a solutions role with some coding on the side. You'll design and build end-to-end, work directly with client technical teams, and ship code that real lawyers rely on.
        more
        Senior Solutions Engineer - Sales - London, United Kingdom - Full Time - We offer a flexible working policy that supports a healthy balance between personal and professional well-being. This role requires in-office presence on Tuesdays & Thursdays to collaborate, connect, and learn from peers - while also maintaining the flexibility for meaningful work-life balance. Being a Senior Solutions Engineer at iManage Means - You will act as a trusted advisor to clients and prospects, leveraging your in-depth knowledge of the iManage platform to design tailored solutions, address technical challenges, and drive successful sales engagements. You will have the opportunity to collaborate closely with Sales, Product Management, and Implementation teams to ensure seamless handoffs and alignments throughout the Sales Cycle.
        Senior Solutions Engineer - Sales - London, United Kingdom - Full Time - We offer a flexible working policy that supports a healthy balance between personal and professional well-being. This role requires in-office presence on Tuesdays & Thursdays to collaborate, connect, and learn from peers - while also maintaining the flexibility for meaningful work-life balance. Being a Senior Solutions Engineer at iManage Means - You will act as a trusted advisor to clients and prospects, leveraging your in-depth knowledge of the iManage platform to design tailored solutions, address technical challenges, and drive successful sales engagements. You will have the opportunity to collaborate closely with Sales, Product Management, and Implementation teams to ensure seamless handoffs and alignments throughout the Sales Cycle.
        more
        Job title: Rust Engineer - Platform - About Keyrock - Since our beginnings in 2017, we've grown to be a leading change-maker in the digital asset space, renowned for our partnerships and innovation. Today, we rock with over 200 team members around the world. Our diverse team hails from 42 nationalities, with backgrounds ranging from DeFi natives to PhDs. Predominantly remote, we have hubs in London, Brussels, Singapore and Paris, and host regular online and offline hangouts to keep the crew tight. We are trading on more than 80 exchanges, and working with a wide array of asset issuers. As a well-established market maker, our distinctive expertise led us to expand rapidly. Today, our services span market making, options trading, high-frequency trading, OTC, and DeFi trading desks as well as digital asset management.
        Job title: Rust Engineer - Platform - About Keyrock - Since our beginnings in 2017, we've grown to be a leading change-maker in the digital asset space, renowned for our partnerships and innovation. Today, we rock with over 200 team members around the world. Our diverse team hails from 42 nationalities, with backgrounds ranging from DeFi natives to PhDs. Predominantly remote, we have hubs in London, Brussels, Singapore and Paris, and host regular online and offline hangouts to keep the crew tight. We are trading on more than 80 exchanges, and working with a wide array of asset issuers. As a well-established market maker, our distinctive expertise led us to expand rapidly. Today, our services span market making, options trading, high-frequency trading, OTC, and DeFi trading desks as well as digital asset management.
        more
        Join Proton and build a better internet where privacy is the default - At Proton, we believe that privacy is a fundamental human right and the cornerstone of democracy. Since our inception in 2014, founded by a team of scientists from CERN, we have dedicated ourselves to providing free and open-source technology to millions worldwide, ensuring access to privacy, security, and freedom online. Our journey began with Proton Mail, the largest secure email service globally, and has since expanded to include Proton VPN, Proton Calendar, Proton Drive, and Proton Pass. These tools empower individuals and organizations to take control of their personal data, break away from Big Tech's invasive practices, and defeat censorship. Our work impacts hundreds of millions of lives, from activists on the front lines defending freedom to leaders in governments protecting sensitive information.
        Join Proton and build a better internet where privacy is the default - At Proton, we believe that privacy is a fundamental human right and the cornerstone of democracy. Since our inception in 2014, founded by a team of scientists from CERN, we have dedicated ourselves to providing free and open-source technology to millions worldwide, ensuring access to privacy, security, and freedom online. Our journey began with Proton Mail, the largest secure email service globally, and has since expanded to include Proton VPN, Proton Calendar, Proton Drive, and Proton Pass. These tools empower individuals and organizations to take control of their personal data, break away from Big Tech's invasive practices, and defeat censorship. Our work impacts hundreds of millions of lives, from activists on the front lines defending freedom to leaders in governments protecting sensitive information.
        more
        Date: 17 Mar 2026 - Location: London, GB, EC2V 7AD - Company: Paysafe - Paysafe is a global payments platform powering the experience economy, with a strong focus on the iGaming, video gaming, e-commerce, retail, travel and hospitality sectors. With 30 years of expertise in payment technology, Paysafe helps businesses and consumers lift every experience through seamless, secure payment solutions, including card payments, digital wallets such as Skrill, eCash solutions like PaysafeCard, and a suite of local payment methods. With approximately 2,900 employees across 12 countries and annualized transactional volume of $167 billion in 2025, Paysafe connects people and businesses worldwide through innovative digital payment experiences. Further information is available at . It starts here. Have a global impact on the world of payments.
        Date: 17 Mar 2026 - Location: London, GB, EC2V 7AD - Company: Paysafe - Paysafe is a global payments platform powering the experience economy, with a strong focus on the iGaming, video gaming, e-commerce, retail, travel and hospitality sectors. With 30 years of expertise in payment technology, Paysafe helps businesses and consumers lift every experience through seamless, secure payment solutions, including card payments, digital wallets such as Skrill, eCash solutions like PaysafeCard, and a suite of local payment methods. With approximately 2,900 employees across 12 countries and annualized transactional volume of $167 billion in 2025, Paysafe connects people and businesses worldwide through innovative digital payment experiences. Further information is available at . It starts here. Have a global impact on the world of payments.
        more
        We are looking for a rare hybrid talent someone who can hack together end-to-end prototypes at speed while also standing confidently in front of a customer's executive team. This role sits at the intersection of engineering, product, and business development . You will be one of the first technical faces customers meet, building semi-deployable prototypes, testing product-market fit in the wild, and representing us in high-stakes conversations with senior stakeholders. If you're an entrepreneurial engineer who thrives in ambiguity, loves building quickly, and wants to see the immediate impact of your work with customers, this role is for you. * Rapidly design, build, and deliver end-to-end prototypes, demos, and proofs-of-concept that help prospects and partners experience the art of the possible.
        We are looking for a rare hybrid talent someone who can hack together end-to-end prototypes at speed while also standing confidently in front of a customer's executive team. This role sits at the intersection of engineering, product, and business development . You will be one of the first technical faces customers meet, building semi-deployable prototypes, testing product-market fit in the wild, and representing us in high-stakes conversations with senior stakeholders. If you're an entrepreneurial engineer who thrives in ambiguity, loves building quickly, and wants to see the immediate impact of your work with customers, this role is for you. * Rapidly design, build, and deliver end-to-end prototypes, demos, and proofs-of-concept that help prospects and partners experience the art of the possible.
        more
        About Us - Moneybox is growing rapidly. We have more users, more accounts, more money invested, more features, more code, more data, and more team members than ever before. We are looking for an Engineering Lead to help us handle this growth without compromising on our service or product quality. This role is part of the backend engineering leadership team. We are looking for an experienced hands-on engineer who has contributed to and managed the delivery of complex software across multiple teams. Our Tech Stack - o - Backend: C# / .NET Core / .NET Framework (being phased out) o Patterns REST APIs, Hangfire, MediatR, Entity Framework, Mass Transit, xUnit - o Azure App Services, Functions, Service Bus, Event Hub, CosmosDB, SQL Server, Data Factory - o Tooling GitHub, Azure DevOps, Terraform, Datadog, Rollbar - What You'll Do
        About Us - Moneybox is growing rapidly. We have more users, more accounts, more money invested, more features, more code, more data, and more team members than ever before. We are looking for an Engineering Lead to help us handle this growth without compromising on our service or product quality. This role is part of the backend engineering leadership team. We are looking for an experienced hands-on engineer who has contributed to and managed the delivery of complex software across multiple teams. Our Tech Stack - o - Backend: C# / .NET Core / .NET Framework (being phased out) o Patterns REST APIs, Hangfire, MediatR, Entity Framework, Mass Transit, xUnit - o Azure App Services, Functions, Service Bus, Event Hub, CosmosDB, SQL Server, Data Factory - o Tooling GitHub, Azure DevOps, Terraform, Datadog, Rollbar - What You'll Do
        more
        Description - techUK Overview: techUK is the trade association which brings together people, companies and organisations to realise the positive outcomes of what digital technology can achieve. With over 1100 members (the majority of which are SMEs) across the UK, techUK creates a network for innovation and collaboration across business, government and stakeholders to provide a better future for people, society, the economy and the planet. By providing expertise and insight, we support our members, partners and stakeholders as they prepare the UK for what comes next in a constantly changing world. Were looking for a Digital Systems Engineer to design, build, and continuously improve the internal digital tools that support our members and staff. Working as part of our Digital Team, youll take a hands-on role in developing and maintaining our CRM, digital product stack and ...
        Description - techUK Overview: techUK is the trade association which brings together people, companies and organisations to realise the positive outcomes of what digital technology can achieve. With over 1100 members (the majority of which are SMEs) across the UK, techUK creates a network for innovation and collaboration across business, government and stakeholders to provide a better future for people, society, the economy and the planet. By providing expertise and insight, we support our members, partners and stakeholders as they prepare the UK for what comes next in a constantly changing world. Were looking for a Digital Systems Engineer to design, build, and continuously improve the internal digital tools that support our members and staff. Working as part of our Digital Team, youll take a hands-on role in developing and maintaining our CRM, digital product stack and ...
        more
        GBR - London, Canada Square - Full time - 2026-03-02 - Posted Today - R0055094 - Join us at Wolters Kluwer and be part of a dynamic global technology company that makes a difference every day. We're innovators with impact. We provide expert software and information solutions that the world's leading professionals rely on, in the moments that matter most. As part of this mission, we're looking for a driven and experienced Principal Software Engineer (DevSecOps) to act as the technical authority for automated delivery, security, and platform reliability across our product engineering organization. This role is responsible for designing, building, and evolving highly automated CI/CD pipelines and secure software delivery platforms that enable teams to ship frequently, safely, and at scale. You will operate as a hands-on technical leader, shaping DevSecOps strategy through code, automation, ...
        GBR - London, Canada Square - Full time - 2026-03-02 - Posted Today - R0055094 - Join us at Wolters Kluwer and be part of a dynamic global technology company that makes a difference every day. We're innovators with impact. We provide expert software and information solutions that the world's leading professionals rely on, in the moments that matter most. As part of this mission, we're looking for a driven and experienced Principal Software Engineer (DevSecOps) to act as the technical authority for automated delivery, security, and platform reliability across our product engineering organization. This role is responsible for designing, building, and evolving highly automated CI/CD pipelines and secure software delivery platforms that enable teams to ship frequently, safely, and at scale. You will operate as a hands-on technical leader, shaping DevSecOps strategy through code, automation, ...
        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 57 permanent API jobs within 20 miles of London available on JustEngineers right now.

        Where in London are these permanent jobs?
        You can find permanent jobs in City of London, South East London, Central 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 Engineering, Management, Software Development, amongst many others.