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        31 API jobs in Harlow + 20 miles

        190 exact matches jobs are outside your preferred location

        AI Solutions Engineer - London

        Transparent Technology
        London, EC1A 4RN
        £70000 - £140000 per annum + + bens + shares
        Especially integration with the OpenAI API GPT, Gemini, LLama, Claude etc.
        Especially integration with the OpenAI API GPT, Gemini, LLama, Claude etc.
        NEW
        Proficiency in at least one major API testing framework - Experience withAzure (APIM, Azure Functions, API Services), React/React-Native and.NET Core
        Proficiency in at least one major API testing framework - Experience withAzure (APIM, Azure Functions, API Services), React/React-Native and.NET Core
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        NEW
        We are currently seeking a D365 Senior Integration Developer (finance) to design and implement integrations using D365 API's (e.g. Data Management Package, REST API, OData) You will develop automation processes for data transformation, upload, import and error handling in batch or near real-time modes. Proficiency in tools like Postman, Azure Logic Apps, and scripting (e.g., C#, PowerShell) for API orchestration, along with ETL processes.
        We are currently seeking a D365 Senior Integration Developer (finance) to design and implement integrations using D365 API's (e.g. Data Management Package, REST API, OData) You will develop automation processes for data transformation, upload, import and error handling in batch or near real-time modes. Proficiency in tools like Postman, Azure Logic Apps, and scripting (e.g., C#, PowerShell) for API orchestration, along with ETL processes.
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        NEW

        Security Architect

        Queen Square Recruitment Limited
        Reading, Berkshire
        From £700 to £750 per day
        Expert-level knowledge of IAM, network security, encryption, API and application security, container security, and SIEM strategies.
        Expert-level knowledge of IAM, network security, encryption, API and application security, container security, and SIEM strategies.
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        NEW
        Backend & Data Proficiency: Skilled in Python, Node.js, PostgreSQL, MongoDB, and API security. * Security & Compliance: Strong understanding of GDPR, API authentication, and observability.
        Backend & Data Proficiency: Skilled in Python, Node.js, PostgreSQL, MongoDB, and API security. * Security & Compliance: Strong understanding of GDPR, API authentication, and observability.
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        NEW

        Senior MVC Developer

        Southern Communications Ltd
        HP2, Hemel Hempstead
        £75,000 per annum
        Take a lead role in the development and support ofMicrosoft MVC and .NET web applications and C# Console and API solutions, ensuring best practices are followed throughout the software lifecycle. * Proficient in.NET (C#), JavaScript, Web API, SQL Server, and working knowledge ofHTML, CSS, XML, JSON.
        Take a lead role in the development and support ofMicrosoft MVC and .NET web applications and C# Console and API solutions, ensuring best practices are followed throughout the software lifecycle. * Proficient in.NET (C#), JavaScript, Web API, SQL Server, and working knowledge ofHTML, CSS, XML, JSON.
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        NEW
        Build and work with modern API and microservices architectures
        Build and work with modern API and microservices architectures
        NEW

        Lead .Net Software Developer

        Hireful
        Milton Keynes, Buckinghamshire
        £65k - £75k base + Bonus
        Are you a hands-on Lead or Senior .Net Developer ready to shape architecture and guide talented developers? Want a hybrid role with 3 days WFH? This is your chance to stay close to the code while making key technical decisions that drive real business impact. You'll join a collaborative, forward-thinking team building cutting-edge products — with the support, tools, and flexibility to thrive. Role: Lead Software Developer, Senior .Net Developer, Software Engineering Manager, Senior Full Stack Developer, Lead .Net Developer, Lead Software Engineer, Senior C# Developer - Salary: £65k - £75k base + Bonus - Benefits: 5% pension, 25 days holiday, 2 wellbeing days, Christmas shutdown, private healthcare, life assurance, cinema tickets & more - Location: Milton Keynes – Hybrid (2 days a week in office) If you’ve got strong .Net (C#) experience and skills in GitHub, APIs, Pos
        Are you a hands-on Lead or Senior .Net Developer ready to shape architecture and guide talented developers? Want a hybrid role with 3 days WFH? This is your chance to stay close to the code while making key technical decisions that drive real business impact. You'll join a collaborative, forward-thinking team building cutting-edge products — with the support, tools, and flexibility to thrive. Role: Lead Software Developer, Senior .Net Developer, Software Engineering Manager, Senior Full Stack Developer, Lead .Net Developer, Lead Software Engineer, Senior C# Developer - Salary: £65k - £75k base + Bonus - Benefits: 5% pension, 25 days holiday, 2 wellbeing days, Christmas shutdown, private healthcare, life assurance, cinema tickets & more - Location: Milton Keynes – Hybrid (2 days a week in office) If you’ve got strong .Net (C#) experience and skills in GitHub, APIs, Pos
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        NEWFEATURED

        Senior Digital Developer (Vue/React, .Net Core, Azure)

        Stott & May Professional Search Limited
        London
        £70000 - £80000 per annum + Benefits
        Strong experience in API design and development, including RESTful APIs and OpenAPI/Swagger standards, using tools like Postman for testing and documentation.
        Strong experience in API design and development, including RESTful APIs and OpenAPI/Swagger standards, using tools like Postman for testing and documentation.
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        NEW
        API Integration Experience:Proven track record of consuming and building APIs for data exchange * Strong understanding of API development and integration (REST, GraphQL)
        API Integration Experience:Proven track record of consuming and building APIs for data exchange * Strong understanding of API development and integration (REST, GraphQL)
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        NEW
        My client is a high-profile consultancy who require an Endur Solution Architect, with experience in Endur and in Energy Trading and Risk Management (ETRM) systems, to work closely with an end customer. * Proven expertise as a Subject Matter Expert (SME) in Energy Trading and Risk Management (ETRM) systems, with deep specialization in Endur. * Ability to deliver strategic guidance and solutions for complex trading and risk management scenarios. * Strong capability to optimize Endur functionalities across front-office, middle-office, and back-office operations. * Demonstrated technical leadership in Endur-related projects, ensuring alignment with business goals and industry standards. * Solid understanding of system integration principles, including APIs, middleware, and data interfaces for seamless enterprise connectivity.
        My client is a high-profile consultancy who require an Endur Solution Architect, with experience in Endur and in Energy Trading and Risk Management (ETRM) systems, to work closely with an end customer. * Proven expertise as a Subject Matter Expert (SME) in Energy Trading and Risk Management (ETRM) systems, with deep specialization in Endur. * Ability to deliver strategic guidance and solutions for complex trading and risk management scenarios. * Strong capability to optimize Endur functionalities across front-office, middle-office, and back-office operations. * Demonstrated technical leadership in Endur-related projects, ensuring alignment with business goals and industry standards. * Solid understanding of system integration principles, including APIs, middleware, and data interfaces for seamless enterprise connectivity.
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        NEW

        JML Solution Architect

        Infoplus Technologies UK Ltd
        Wokingham, Berkshire
        From £500 to £550 per day
        Role/Job title - Work Location - Wokingham - Role type - Permanent/Fixed Term/ Contracting - Contracting - Mode of working Hybrid /office based - Hybrid - If Hybrid, how many days are required in office? 3 days a week - Duration of assignment - 6 months - To be published on job boards from below onwards - The Role - The JML Solution Architect will be responsible for designing and implementing a solution to manage the access rights of their employees and stakeholders more efficiently and securely. The Joiner, Mover, and Leaver (JML) process has emerged as a pivotal framework within Identity & Access Management (IAM) to tackle this challenge head-on. It encompasses a comprehensive approach to managing user access throughout their lifecycle within an organization. This solution will integrate multiple data sources, automate workflows, and provide valuable insights to inf
        Role/Job title - Work Location - Wokingham - Role type - Permanent/Fixed Term/ Contracting - Contracting - Mode of working Hybrid /office based - Hybrid - If Hybrid, how many days are required in office? 3 days a week - Duration of assignment - 6 months - To be published on job boards from below onwards - The Role - The JML Solution Architect will be responsible for designing and implementing a solution to manage the access rights of their employees and stakeholders more efficiently and securely. The Joiner, Mover, and Leaver (JML) process has emerged as a pivotal framework within Identity & Access Management (IAM) to tackle this challenge head-on. It encompasses a comprehensive approach to managing user access throughout their lifecycle within an organization. This solution will integrate multiple data sources, automate workflows, and provide valuable insights to inf
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        NEW
        Build cloud-native applications using AWS services such as Lambda, API Gateway, DynamoDB, SQS, and EventBridge * Solid experience with AWS application services (Lambda, API Gateway, Step Functions, DynamoDB, etc.) * Proven ability to design and build modern, API-driven systems in a scalable resilient cloud-based platform * Experience with modern front-end frameworks and API integration (React, Vue, Angular)
        Build cloud-native applications using AWS services such as Lambda, API Gateway, DynamoDB, SQS, and EventBridge * Solid experience with AWS application services (Lambda, API Gateway, Step Functions, DynamoDB, etc.) * Proven ability to design and build modern, API-driven systems in a scalable resilient cloud-based platform * Experience with modern front-end frameworks and API integration (React, Vue, Angular)
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        NEW
        We are looking for a Software Engineer with a strong foundation in API development and C# to join our data engineering team in a highly regulated industry. Were seeking candidates with over 5 years of relevant experience, a solid understanding of software system design, and a strong command of C# and modern API development patterns. * Experience with authentication, authorization, and secure API communication (OAuth2, JWT, etc.). * Familiarity with API gateways, microservice architecture, and asynchronous messaging patterns (e.g., queues, event buses).
        We are looking for a Software Engineer with a strong foundation in API development and C# to join our data engineering team in a highly regulated industry. Were seeking candidates with over 5 years of relevant experience, a solid understanding of software system design, and a strong command of C# and modern API development patterns. * Experience with authentication, authorization, and secure API communication (OAuth2, JWT, etc.). * Familiarity with API gateways, microservice architecture, and asynchronous messaging patterns (e.g., queues, event buses).
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        NEW
        We are looking for a Software Engineer with a strong foundation in API development and C# to join our data engineering team in a highly regulated industry. Were seeking candidates with over 5 years of relevant experience, a solid understanding of software system design, and a strong command of C# and modern API development patterns. * Experience with authentication, authorization, and secure API communication (OAuth2, JWT, etc.). * Familiarity with API gateways, microservice architecture, and asynchronous messaging patterns (e.g., queues, event buses).
        We are looking for a Software Engineer with a strong foundation in API development and C# to join our data engineering team in a highly regulated industry. Were seeking candidates with over 5 years of relevant experience, a solid understanding of software system design, and a strong command of C# and modern API development patterns. * Experience with authentication, authorization, and secure API communication (OAuth2, JWT, etc.). * Familiarity with API gateways, microservice architecture, and asynchronous messaging patterns (e.g., queues, event buses).
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        NEWPREMIUM
        Rate - £500 per day Inside IR35 - Duration - 1 month initial - Location - Remote with occasional visits into London - We are looking for an experienced Siebel Developer to join our client's technology team and play a pivotal role in the design, development and migration of Siebel CRM solutions. You will be responsible for enhancing existing systems, delivering robust integrations with external applications and supporting large-scale migration projects as part of digital transformation initiatives. * Design, configure and develop Siebel CRM applications to meet evolving business requirements. * Support migration projects, including data migration, environment upgrades and platform transitions. * Deliver robust integrations between Siebel and third-party systems using Siebel EAI, web services, APIs and middleware.
        Rate - £500 per day Inside IR35 - Duration - 1 month initial - Location - Remote with occasional visits into London - We are looking for an experienced Siebel Developer to join our client's technology team and play a pivotal role in the design, development and migration of Siebel CRM solutions. You will be responsible for enhancing existing systems, delivering robust integrations with external applications and supporting large-scale migration projects as part of digital transformation initiatives. * Design, configure and develop Siebel CRM applications to meet evolving business requirements. * Support migration projects, including data migration, environment upgrades and platform transitions. * Deliver robust integrations between Siebel and third-party systems using Siebel EAI, web services, APIs and middleware.
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        NEWFEATURED
        Level: Mid-Senior/Senior; Remuneration dependent upon experience - All applications should include a covering letter; references should also be available on request. Who We Are - Ochre is a music retail technology company, helping labels, artists, distributors, and brands to run their ecommerce operations. Growing from our roots in music D2C (direct-to-consumer) retail, we are becoming a leader in providing tailored and scalable ecommerce solutions for the music industry. We work with some of the worlds best labels and artists - including Warp, Oasis, Dirty Hit, Ninja Tune, Partisan Records, Anjuna and many, many more. We are a creative company dedicated to helping our clients succeed in music ecommerce through best-in-class tools and services. As we expand and develop, we want to find new team members who are not only skilled in their field - but also passionate abou
        Level: Mid-Senior/Senior; Remuneration dependent upon experience - All applications should include a covering letter; references should also be available on request. Who We Are - Ochre is a music retail technology company, helping labels, artists, distributors, and brands to run their ecommerce operations. Growing from our roots in music D2C (direct-to-consumer) retail, we are becoming a leader in providing tailored and scalable ecommerce solutions for the music industry. We work with some of the worlds best labels and artists - including Warp, Oasis, Dirty Hit, Ninja Tune, Partisan Records, Anjuna and many, many more. We are a creative company dedicated to helping our clients succeed in music ecommerce through best-in-class tools and services. As we expand and develop, we want to find new team members who are not only skilled in their field - but also passionate abou
        more
        NEW

        Data Engineer

        Fortice Ltd
        CB1, Cambridge
        £75,000 per annum + Package
        Cambridge/ Hybrid 2x per week onsite| ?? £60,000£75,000| ?? SC or DV Clearance Required - Were working with a specialist technology consultancy delivering cutting-edge solutions into the UKs most secure government environments. Due to continued growth, theyre looking for a talented Data Engineer to join their secure data team and help solve complex, high-impact challenges. The role - Youll design and develop secure data pipelines and platforms, working on projects that process sensitive, mission-critical information. This is an opportunity to apply your technical skills in an environment where your work has a direct impact on national security. * Build and optimise scalable data pipelines, sourcing from APIs and external datasets, and merging them with other data sources to create unified models * Produce geospatial datasets for integration with visualisation tools, h
        Cambridge/ Hybrid 2x per week onsite| ?? £60,000£75,000| ?? SC or DV Clearance Required - Were working with a specialist technology consultancy delivering cutting-edge solutions into the UKs most secure government environments. Due to continued growth, theyre looking for a talented Data Engineer to join their secure data team and help solve complex, high-impact challenges. The role - Youll design and develop secure data pipelines and platforms, working on projects that process sensitive, mission-critical information. This is an opportunity to apply your technical skills in an environment where your work has a direct impact on national security. * Build and optimise scalable data pipelines, sourcing from APIs and external datasets, and merging them with other data sources to create unified models * Produce geospatial datasets for integration with visualisation tools, h
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        NEW
        Contract: Automated Test Engineer (SFIA 5) Rate: £400/day | Outside IR35 | Duration: 12 months - Security Clearance: NPPV2 / NPPV3 - We are seeking an experienced Automated Test Engineer to design and implement automated testing frameworks for complex systems. You will ensure both functional and non-functional requirements are met, working closely with stakeholders to deliver high-quality solutions in a fully remote, agile environment. * Develop and enhance automated testing across all stages of product, system, and service development. * Collaborate with stakeholders to define requirements, acceptance criteria, and ensure robust test coverage. * Implement automation-first strategies and best practices for repeatable, efficient testing. * Identify and adopt tools, techniques, and processes to strengthen testing frameworks. * Mentor and support less experienced test en
        Contract: Automated Test Engineer (SFIA 5) Rate: £400/day | Outside IR35 | Duration: 12 months - Security Clearance: NPPV2 / NPPV3 - We are seeking an experienced Automated Test Engineer to design and implement automated testing frameworks for complex systems. You will ensure both functional and non-functional requirements are met, working closely with stakeholders to deliver high-quality solutions in a fully remote, agile environment. * Develop and enhance automated testing across all stages of product, system, and service development. * Collaborate with stakeholders to define requirements, acceptance criteria, and ensure robust test coverage. * Implement automation-first strategies and best practices for repeatable, efficient testing. * Identify and adopt tools, techniques, and processes to strengthen testing frameworks. * Mentor and support less experienced test en
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        NEWFEATURED

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        There are 31 API jobs within 20 miles of Harlow available on CWJobs right now.

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