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        17 Permanent API jobs in Windsor + 20 miles

        200 exact matches jobs are outside your preferred location

        ABAP Developer - Break out of the SAP Box

        LJ Recruitment Limited
        EC1, City of London
        £50000 - £75000 per annum
        ABAP Developer ? AI / Startup Role?? Most ABAP roles keep you maintaining the same old codebase. This one lets you take your SAP expertise and plug it straight into a modern AI platform that's transforming how global enterprises run their tech. This London startup is tackling a multi-billion-dollar problem: helping the world's biggest companies turn ERP chaos into clarity. Their AI engine saves millions in IT costs, accelerates project timelines by months, and modernises decades-old systems in ways that have never been done before. This is a role for those who live and breathe tech. Hours run 9am-7pm, and the expectation is clear: hard work and full commitment are what make the difference here. What you'll do * Write and optimise ABAP while shaping how AI agents interpret SAP. * Go beyond SAP, contribute to backend services, APIs, and infrastructure.
        ABAP Developer ? AI / Startup Role?? Most ABAP roles keep you maintaining the same old codebase. This one lets you take your SAP expertise and plug it straight into a modern AI platform that's transforming how global enterprises run their tech. This London startup is tackling a multi-billion-dollar problem: helping the world's biggest companies turn ERP chaos into clarity. Their AI engine saves millions in IT costs, accelerates project timelines by months, and modernises decades-old systems in ways that have never been done before. This is a role for those who live and breathe tech. Hours run 9am-7pm, and the expectation is clear: hard work and full commitment are what make the difference here. What you'll do * Write and optimise ABAP while shaping how AI agents interpret SAP. * Go beyond SAP, contribute to backend services, APIs, and infrastructure.
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        NEWFEATURED

        Automation Test Engineer

        Data Careers
        London
        £55000 - £90000 per annum + comprehensive range of Employee Benefits
        Automation Tester (ETRM Platforms) Permanent - Location: UK - Remote - Salary: £55,000 - £90,000 (+ benefits) Skills: ETRM platform experience, (Openlink Endur, Findur etc.), Automation testing Python, Java etc. We are seeking Automation Testers, (up to Lead Tester), for a leading software company that delivers advanced solutions for trading and risk management across global financial and energy markets. There are options for both fully remote and hybrid / London working. What you'll bring * Programming & Scripting: Python, Java, JavaScript, C++, Scriban * Web Technologies: RESTful APIs, HTTP, JSON, HTML, CSS, Node.js * Databases: SQL Server, MySQL, PostgreSQL, MongoDB * Tools & Frameworks: Git, Docker, Jenkins, Kubernetes, Agile (Scrum & Kanban), JIRA, Pytest, Powershell * Operating Systems: Linux, Windows * CI/CD pipelines and debugging expertise * BDD frameworks su
        Automation Tester (ETRM Platforms) Permanent - Location: UK - Remote - Salary: £55,000 - £90,000 (+ benefits) Skills: ETRM platform experience, (Openlink Endur, Findur etc.), Automation testing Python, Java etc. We are seeking Automation Testers, (up to Lead Tester), for a leading software company that delivers advanced solutions for trading and risk management across global financial and energy markets. There are options for both fully remote and hybrid / London working. What you'll bring * Programming & Scripting: Python, Java, JavaScript, C++, Scriban * Web Technologies: RESTful APIs, HTTP, JSON, HTML, CSS, Node.js * Databases: SQL Server, MySQL, PostgreSQL, MongoDB * Tools & Frameworks: Git, Docker, Jenkins, Kubernetes, Agile (Scrum & Kanban), JIRA, Pytest, Powershell * Operating Systems: Linux, Windows * CI/CD pipelines and debugging expertise * BDD frameworks su
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        NEW

        Python Developer - AI - Hybrid Remote

        VERTECH GROUP (UK) LTD
        N7, North London
        From £100,000 to £110,000 per annum + Benefits
        Python Developer - Location: 3 days per week from home / 2 days in London - Salary: Circa 100K 110K + Benefits - Python Developer required by a fast-growing, revolutionary Tech Company! This is a varied, challenging role where you'll responsible for integrating AI functionality into production systems, working closely with other developers to deliver scalable, reliable, and well-structured solutions * At least 4 years backend development experience * Strong expertise in Python (FastAPI, Flask, or Django) * Good understanding of backend architecture, APIs, and cloud environments (AWS, Azure, or GCP) * Experience integrating AI or LLM APIs and open-source models into live products * Hands-on experience building or maintaining Retrieval-Augmented Generation (RAG) pipelines - Tremendous opportunity offering plenty of scope for career progression in a friendly, innovative
        Python Developer - Location: 3 days per week from home / 2 days in London - Salary: Circa 100K 110K + Benefits - Python Developer required by a fast-growing, revolutionary Tech Company! This is a varied, challenging role where you'll responsible for integrating AI functionality into production systems, working closely with other developers to deliver scalable, reliable, and well-structured solutions * At least 4 years backend development experience * Strong expertise in Python (FastAPI, Flask, or Django) * Good understanding of backend architecture, APIs, and cloud environments (AWS, Azure, or GCP) * Experience integrating AI or LLM APIs and open-source models into live products * Hands-on experience building or maintaining Retrieval-Augmented Generation (RAG) pipelines - Tremendous opportunity offering plenty of scope for career progression in a friendly, innovative
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        Company Description - At The Stepstone Group, we have a simple yet very important mission: The right job for everyone. Using our data, platform, and technology, we create opportunities for jobseekers and companies around the world to find a perfect match in fair and equitable way. With over 20 brands across 30+ countries, we strive for fair and unbiased hiring. Join our team of 4,000+ employees and be part of reshaping the labour market and becoming the worlds leading job platform. Job Description - Join our team and youll be responsible for providing technical leadership to all engineering and development areas across your domain, developing and executing an engineering strategy aligned to the portfolio and global tech strategies. Working in the Design and Platform Performance domain, you willlead the technology side of web and mobile analytics for a platform with ov
        Company Description - At The Stepstone Group, we have a simple yet very important mission: The right job for everyone. Using our data, platform, and technology, we create opportunities for jobseekers and companies around the world to find a perfect match in fair and equitable way. With over 20 brands across 30+ countries, we strive for fair and unbiased hiring. Join our team of 4,000+ employees and be part of reshaping the labour market and becoming the worlds leading job platform. Job Description - Join our team and youll be responsible for providing technical leadership to all engineering and development areas across your domain, developing and executing an engineering strategy aligned to the portfolio and global tech strategies. Working in the Design and Platform Performance domain, you willlead the technology side of web and mobile analytics for a platform with ov
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        PREMIUM
        Meta's Network Security team is seeking an experienced engineer to help secure our global Data Centers, network Backbone, Optical Infrastructure, and Edge PoPs. We do this by working extensively across the Meta family of products, including Instagram, WhatsApp, and AI where we identify and solve security problems across network infrastructure. You will be responsible for building, implementing, and operationally supporting the organization to develop security controls and services that will protect network infrastructure which helps serve traffic for over 3 billion users worldwide. We are looking for engineers with experience in managing complex issues that require problem-solving to drive security and innovation, who will research and develop new solutions to help protect our infrastructure and our users through a defense in-depth approach.
        Meta's Network Security team is seeking an experienced engineer to help secure our global Data Centers, network Backbone, Optical Infrastructure, and Edge PoPs. We do this by working extensively across the Meta family of products, including Instagram, WhatsApp, and AI where we identify and solve security problems across network infrastructure. You will be responsible for building, implementing, and operationally supporting the organization to develop security controls and services that will protect network infrastructure which helps serve traffic for over 3 billion users worldwide. We are looking for engineers with experience in managing complex issues that require problem-solving to drive security and innovation, who will research and develop new solutions to help protect our infrastructure and our users through a defense in-depth approach.
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        LSEG is seeking a Senior Penetration Tester to join our internal offensive security team. This role is hands-on and deeply technical, responsible for planning and driving penetration tests across a wide range of systems and applications. The successful candidate will be a skilled offensive security professional with a passion for uncovering vulnerabilities and improving security posture through thorough testing and teamwork. Key Responsibilities * Conduct in-depth penetration tests on applications, infrastructure, and cloud environments. * Take full ownership of assigned penetration testing engagements end-to-end and deliver with limited oversight. * Compile technical scoping documents, track and document assessment metadata - o Engagement details (who, what, when, where) o Testing team members and roles - o Tools and methodologies used - o Schedule and timelines
        LSEG is seeking a Senior Penetration Tester to join our internal offensive security team. This role is hands-on and deeply technical, responsible for planning and driving penetration tests across a wide range of systems and applications. The successful candidate will be a skilled offensive security professional with a passion for uncovering vulnerabilities and improving security posture through thorough testing and teamwork. Key Responsibilities * Conduct in-depth penetration tests on applications, infrastructure, and cloud environments. * Take full ownership of assigned penetration testing engagements end-to-end and deliver with limited oversight. * Compile technical scoping documents, track and document assessment metadata - o Engagement details (who, what, when, where) o Testing team members and roles - o Tools and methodologies used - o Schedule and timelines
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        FTSE Russell is a leading global provider of financial services, specializing in the creation and management of indexes, data, and analytic solutions. A subsidiary of the London Stock Exchange Group (LSEG), FTSE Russell supports investors worldwide in making informed decisions across asset classes, investment strategies, and market segments. Its products are trusted by institutional and retail investors, asset managers, and pension funds to benchmark performance, build investment portfolios, and manage risk. With a reputation for innovation, transparency, and robust governance, FTSE Russell plays a critical role in shaping global financial markets. FTSE Russell is seeking a hands-on dynamic software development leader to drive a team of software engineers building robust equity index capabilities and indexes.
        FTSE Russell is a leading global provider of financial services, specializing in the creation and management of indexes, data, and analytic solutions. A subsidiary of the London Stock Exchange Group (LSEG), FTSE Russell supports investors worldwide in making informed decisions across asset classes, investment strategies, and market segments. Its products are trusted by institutional and retail investors, asset managers, and pension funds to benchmark performance, build investment portfolios, and manage risk. With a reputation for innovation, transparency, and robust governance, FTSE Russell plays a critical role in shaping global financial markets. FTSE Russell is seeking a hands-on dynamic software development leader to drive a team of software engineers building robust equity index capabilities and indexes.
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        Role Summary - LSEGs ambition is to be one of the worlds greatest companies and best places to work. To achieve this, we are on a journey of building a world class engineering function supporting our Customer Data Master (CDM) Platform team. The team has embarked on a journey to provide internal teams and platform teams with a fully managed customer data master platform. The role will take part in the definition of the CDM strategy and execution of the CDM engineering strategy and deliver the technology capability, in line with the Corporate Engineering (CE) strategy which includes evolving our current master data capability. What youll be doing * Lead a senior engineering team (5 growing to ~10 across Reltio and data integration) to design, build and run the Customer MDM platform as a durable product with clear ownership.
        Role Summary - LSEGs ambition is to be one of the worlds greatest companies and best places to work. To achieve this, we are on a journey of building a world class engineering function supporting our Customer Data Master (CDM) Platform team. The team has embarked on a journey to provide internal teams and platform teams with a fully managed customer data master platform. The role will take part in the definition of the CDM strategy and execution of the CDM engineering strategy and deliver the technology capability, in line with the Corporate Engineering (CE) strategy which includes evolving our current master data capability. What youll be doing * Lead a senior engineering team (5 growing to ~10 across Reltio and data integration) to design, build and run the Customer MDM platform as a durable product with clear ownership.
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        Senior C# Developer - Finance

        Client Server
        The City, EC4
        £100000 - £150000 per annum + bonus + benefits
        There's a focus on C# .Net backend and API development although you'll also have elements of front end work with JavaScript and React.js.
        There's a focus on C# .Net backend and API development although you'll also have elements of front end work with JavaScript and React.js.
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        NEWPREMIUM

        Senior Enterprise Architect

        Gem Partnership
        The City, EC2N 4AG
        plus pension, bonus and healthcare
        Deep Azure expertise, with M365 ecosystem governance: Power Platform, E5 optimisation, Azure integration services such as Logic Apps, Service Bus, Event Grid, API Management).
        Deep Azure expertise, with M365 ecosystem governance: Power Platform, E5 optimisation, Azure integration services such as Logic Apps, Service Bus, Event Grid, API Management).
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        NEW
        Role: API Integration Engineer - We are seeking a highly skilled API Integration Engineer to join our technology team. * Design, build, and maintain API integrations for telecom OSS/BSS systems, Openreach APIs, supplier platforms, and enterprise applications. * Manage API version upgrades and partner change notifications. * Apply robust fault handling, retry logic, and back-off strategies for resilient API operations. * Design and maintain CI/CD pipelines using GitLab, Azure DevOps, and Jenkins for API and data workflow deployments. * Work closely with the Chief Enterprise & Security Officer and enterprise architects to co-develop a five-year, API-first roadmap for intelligent, context-aware systems. * Provide technical leadership and guidance on mode
        Role: API Integration Engineer - We are seeking a highly skilled API Integration Engineer to join our technology team. * Design, build, and maintain API integrations for telecom OSS/BSS systems, Openreach APIs, supplier platforms, and enterprise applications. * Manage API version upgrades and partner change notifications. * Apply robust fault handling, retry logic, and back-off strategies for resilient API operations. * Design and maintain CI/CD pipelines using GitLab, Azure DevOps, and Jenkins for API and data workflow deployments. * Work closely with the Chief Enterprise & Security Officer and enterprise architects to co-develop a five-year, API-first roadmap for intelligent, context-aware systems. * Provide technical leadership and guidance on mode
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        Technical Architect

        Career Legal Ltd
        EC1M, City of London
        From £85,000 to £100,000 per annum
        Experience in developing and deploying Cloud Native Applications using Azure PaaS Capabilities (App Services Plans, Key Vault, SQL Azure DB, AzureFunctions, Containers, AKS, Logic Apps, Service Bus, Event Grid, API Management) * Enterprise Integration Technologies such as Azure API Management, Logic Apps, Service Bus.
        Experience in developing and deploying Cloud Native Applications using Azure PaaS Capabilities (App Services Plans, Key Vault, SQL Azure DB, AzureFunctions, Containers, AKS, Logic Apps, Service Bus, Event Grid, API Management) * Enterprise Integration Technologies such as Azure API Management, Logic Apps, Service Bus.
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        NEW

        SDET-Java

        Randstad Digital
        RH15, Burgess Hill
        £55000 - £60000 per annum
        Knowledge of the following tools Cucumber Godog or other BDD tools Kubernetes Docker Rest Assured Rest or other REST API testing tools Wiremock Mountebank or other HTTP stubbing tools
        Knowledge of the following tools Cucumber Godog or other BDD tools Kubernetes Docker Rest Assured Rest or other REST API testing tools Wiremock Mountebank or other HTTP stubbing tools
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        NEWFEATURED
        Experience with some of the technologies we make use of: Groovy, Python, AWS Serverless (API Gateway, Lambdas), XML, JSON, Open API, virtualisation in general and especially Docker and its eco system, Git, NoSQL products and concepts (Dynamo, column family, etc.)
        Experience with some of the technologies we make use of: Groovy, Python, AWS Serverless (API Gateway, Lambdas), XML, JSON, Open API, virtualisation in general and especially Docker and its eco system, Git, NoSQL products and concepts (Dynamo, column family, etc.)
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        NEW

        Quantitative Analyst - Modelling and Structured Credit

        CBSbutler Holdings Limited
        EC1, City of London
        £80000 - £120000 per annum + Bonus + Full Benefits
        Leverage and integrate Intex analytics, with particular focus on the latest Intex API. o Solid, hands-on experience with Intex, including recent use of the latest Intex API.
        Leverage and integrate Intex analytics, with particular focus on the latest Intex API. o Solid, hands-on experience with Intex, including recent use of the latest Intex API.
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        CRM Test Lead

        Stott & May Professional Search Limited
        London
        £65000 - £70000 per annum
        Integration & API Testing - proficiency with REST/OData service testing using tools like Postman or SoapUI
        Integration & API Testing - proficiency with REST/OData service testing using tools like Postman or SoapUI
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        NEW
        Build, fine-tune, and evaluate LLM-based Q&A models using frameworks like AWS Bedrock, Langchain, HuggingFace Transformers or OpenAI API.
        Build, fine-tune, and evaluate LLM-based Q&A models using frameworks like AWS Bedrock, Langchain, HuggingFace Transformers or OpenAI API.
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        NEW

        QA Engineer

        Spectrum It Recruitment Limited
        OX13, Abingdon
        £50000 - £55000 per annum
        Contribute to backend/API testing and assist with security testing initiatives * Strong knowledge of API testing and backend system validation
        Contribute to backend/API testing and assist with security testing initiatives * Strong knowledge of API testing and backend system validation
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        NEW

        SharePoint Developer

        PPF (Pension Protection Fund)
        CR0, Croydon
        From £56,000 to £61,500 per annum plus Civil Service pension and other
        You should be confident working with cloud technologies like Azure, API development and integration, and SharePoint administration.
        You should be confident working with cloud technologies like Azure, API development and integration, and SharePoint administration.
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        NEWFEATURED
        You'll also ensure alignment with enterprise-grade security practices, including zero trust principles, identity-aware routing, and integration with Azure API Management and Application Gateway. * API Gateway, Azure API Management (APIM), Azure Application Gateway
        You'll also ensure alignment with enterprise-grade security practices, including zero trust principles, identity-aware routing, and integration with Azure API Management and Application Gateway. * API Gateway, Azure API Management (APIM), Azure Application Gateway
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        NEW

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        Frequently Asked Questions

        How many permanent API jobs are there in Windsor?
        There are 17 permanent API jobs within 20 miles of Windsor available on CWJobs right now.

        What other similar jobs are there to permanent API jobs in Windsor?
        As well as permanent API jobs in Windsor, you can find permanent React Developer, IT, Software Development, amongst many others.