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        51 Contract API jobs in Harlow + 20 miles

        461 exact matches jobs are outside your preferred location

        .NET Software Developer Senior

        Queen Square Recruitment Limited
        GU14, Farnborough
        Up to £365 per day
        Strong experience with RESTful API development in microservice environments
        Strong experience with RESTful API development in microservice environments
        NEW
        Strong hands-on knowledge of Azure integration services (Logic Apps, Azure Functions, Service Bus, API * Experience with REST API testing, Swagger/OpenAPI validation, and API test automation. * Experience with contract testing frameworks (Pact) and API mocking/stubbing approaches.
        Strong hands-on knowledge of Azure integration services (Logic Apps, Azure Functions, Service Bus, API * Experience with REST API testing, Swagger/OpenAPI validation, and API test automation. * Experience with contract testing frameworks (Pact) and API mocking/stubbing approaches.
        more
        AWS experience (Lambda, SNS, S3, EKS, API Gateway) * Bonus points for: DBT, Airflow, Atlan, Iceberg, CI/CD, API modelling
        AWS experience (Lambda, SNS, S3, EKS, API Gateway) * Bonus points for: DBT, Airflow, Atlan, Iceberg, CI/CD, API modelling
        more
        PREMIUM

        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.
        more
        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.
        more
        NEW
        Excellent development skills, with a depth of experience including C#, Java (Spring Boot, JPA/Hibernate), REST API's, observability and monitoring, queue technologies and security.
        Excellent development skills, with a depth of experience including C#, Java (Spring Boot, JPA/Hibernate), REST API's, observability and monitoring, queue technologies and security.
        more
        PREMIUM

        Data Engineer

        Singular Recruitment
        W1, Central London
        From £50,000 to £70,000 per annum
        API Development:Experience building data-centric APIs, especially withFastAPIon serverless platforms likeGoogle App Engine.
        API Development:Experience building data-centric APIs, especially withFastAPIon serverless platforms likeGoogle App Engine.
        more

        Azure Cosmos Developer

        Infoplus Technologies UK Ltd
        London
        From £450 to £550 per day Daily rates are within Inside IR35
        This role involves developing cloud-native solutions using Azure Cosmos DB (SQL API and Mongo API), implementing effective partitioning strategies, indexing, and consistency models to support real-time financial data processing. * Develop cloud-native applications using Azure Cosmos DB (SQL API, Mongo API) * Experience with SQL API and familiarity with other APIs
        This role involves developing cloud-native solutions using Azure Cosmos DB (SQL API and Mongo API), implementing effective partitioning strategies, indexing, and consistency models to support real-time financial data processing. * Develop cloud-native applications using Azure Cosmos DB (SQL API, Mongo API) * Experience with SQL API and familiarity with other APIs
        more
        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.
        more
        NEW
        Build and work with modern API and microservices architectures
        Build and work with modern API and microservices architectures
        NEW
        Configure and test API connectivity for seamless data transmission between clients and the platform * Strong knowledge of REST APIs and API integration * Familiarity with AWS and API connectivity in cloud environments
        Configure and test API connectivity for seamless data transmission between clients and the platform * Strong knowledge of REST APIs and API integration * Familiarity with AWS and API connectivity in cloud environments
        more

        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
        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)
        more
        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.
        more
        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)
        more
        NEW
        Agile Methodology, Agile Methodology, Agility core practices, Analytics, AngularJS, API and platform design, Azure Devops, Business Analysis, Cloud Platforms, Coaching, Communication, Configuration management and release, Continuous deployment and release, CSS HTML, Data Structures and Algorithms (Inactive), Detail-Oriented, Digital Project Management, Documentation and knowledge sharing, Facilitation, Git, Information Security, iOS and Android development, JavaScript, JavaScript Frameworks, JavaScript Libraries {+ 19 more}
        Agile Methodology, Agile Methodology, Agility core practices, Analytics, AngularJS, API and platform design, Azure Devops, Business Analysis, Cloud Platforms, Coaching, Communication, Configuration management and release, Continuous deployment and release, CSS HTML, Data Structures and Algorithms (Inactive), Detail-Oriented, Digital Project Management, Documentation and knowledge sharing, Facilitation, Git, Information Security, iOS and Android development, JavaScript, JavaScript Frameworks, JavaScript Libraries {+ 19 more}
        more
        NEW

        Dynatrace SME

        Infoplus Technologies UK Ltd
        London
        From £450 to £500 per day
        API and automation experience Integrating with REST APIs, building automation scripts (Python, PowerShell, Bash, etc.), and embedding configuration into CI/CD pipelines.
        API and automation experience Integrating with REST APIs, building automation scripts (Python, PowerShell, Bash, etc.), and embedding configuration into CI/CD pipelines.
        more
        NEW
        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.
        more
        FEATURED

        Software Engineering Lead

        Dignity Funerals Limited
        Maidenhead Court, SL6 8LT
        Up to £110,000 per annum
        Contract: Full-Time, Permanent - Location: Maidenhead, Berkshire (Hybrid flexible, 3 days office) Salary: Up to £110,000 per annum - At Dignity and Farewill, we're redefining what end-of-life services can look and feel like - modern, compassionate, accessible. As we combine the scale and experience of Dignity with Farewill's tech-driven innovation, we're building a next-generation platform to support families at one of life's most important moments. We're looking for two Software Engineering Lead's to join our growing technology team and help drive this transformation. This is a hands-on technical leadership role, responsible for guiding one of our key product domains - whether that's Funeral Plans, Legal Services, or At-Need Funerals - from strategy through to scalable, secure software delivery. What you'll be doing
        Contract: Full-Time, Permanent - Location: Maidenhead, Berkshire (Hybrid flexible, 3 days office) Salary: Up to £110,000 per annum - At Dignity and Farewill, we're redefining what end-of-life services can look and feel like - modern, compassionate, accessible. As we combine the scale and experience of Dignity with Farewill's tech-driven innovation, we're building a next-generation platform to support families at one of life's most important moments. We're looking for two Software Engineering Lead's to join our growing technology team and help drive this transformation. This is a hands-on technical leadership role, responsible for guiding one of our key product domains - whether that's Funeral Plans, Legal Services, or At-Need Funerals - from strategy through to scalable, secure software delivery. What you'll be doing
        more
        FEATURED

        Senior Software Developer

        Lean People Services Limited
        Luton, Bedfordshire
        From £75,000 to £85,000 per annum
        up to £85,000 per annum - Full Time Mon-Fri - Our Client provide remote diagnostic solutions and services to the automotive industry. They offer cutting-edge, expert diagnostics using both after-market and original equipment manufacturer tools to provide safe and accurate repairs. The company was founded in 2010 and is headquartered in Plano, TX with UK offices in Peterlee and Bedfordshire. As more automotive software technologies emerge, including autonomous driving, advanced diagnostics, vehicle connectivity, digital cockpits the Company aims to gain a first-mover advantage by developing software solutions with the help of automotive software engineers. If the idea of making an impact on a project lifecycle sounds appealing from its inception down to testing and deployment appeals to you, keep on reading!
        up to £85,000 per annum - Full Time Mon-Fri - Our Client provide remote diagnostic solutions and services to the automotive industry. They offer cutting-edge, expert diagnostics using both after-market and original equipment manufacturer tools to provide safe and accurate repairs. The company was founded in 2010 and is headquartered in Plano, TX with UK offices in Peterlee and Bedfordshire. As more automotive software technologies emerge, including autonomous driving, advanced diagnostics, vehicle connectivity, digital cockpits the Company aims to gain a first-mover advantage by developing software solutions with the help of automotive software engineers. If the idea of making an impact on a project lifecycle sounds appealing from its inception down to testing and deployment appeals to you, keep on reading!
        more

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        Frequently Asked Questions

        How many contract API jobs are there in Harlow?
        There are 51 contract API jobs within 20 miles of Harlow available on CWJobs right now.

        What other similar jobs are there to contract API jobs in Harlow?
        As well as contract API jobs in Harlow, you can find contract Javascript, IT, Software Development, amongst many others.