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        51 Contract API jobs in Harlow + 20 miles

        Senior React Developer - Fintech

        Client Server
        W1T, West London
        £70000 - £80000 per annum
        Senior React Developer / Front End Engineer (React TypeScript Data Visualisation) London to £80k - Are you a skilled Software Developer with strong React and Data Visualisation skills combined with a good appreciation of financial markets and technology? You could be joining a growing, global, Fintech services company that has seen 30-40% year on year growth for the past 10 years and has ambitious growth plans. As a Senior React Developer you'll design and develop new features and enhancements to the front end of the platform with a focus on real-time data visualisation on business critical systems using React. You'll collaborate with backend engineers to build complex financial products. You'll join the team in Central London three days a week with flexibility to work from home the other two days.
        Senior React Developer / Front End Engineer (React TypeScript Data Visualisation) London to £80k - Are you a skilled Software Developer with strong React and Data Visualisation skills combined with a good appreciation of financial markets and technology? You could be joining a growing, global, Fintech services company that has seen 30-40% year on year growth for the past 10 years and has ambitious growth plans. As a Senior React Developer you'll design and develop new features and enhancements to the front end of the platform with a focus on real-time data visualisation on business critical systems using React. You'll collaborate with backend engineers to build complex financial products. You'll join the team in Central London three days a week with flexibility to work from home the other two days.
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        NEWPREMIUM
        Are you passionate about creating smart, effective solutions that make a real difference? In a system as critical and complex as the NHS, poor inventory management doesn’t just waste money — it risks lives, reduces efficiency, and erodes trust. Improvements in digital tracking, data integration, and supply chain coordination are essential to mitigate these effects. At Ingenica Solutions we build smart inventory management software solutions to help the healthcare sector gain control over inventory, track usage at the point of care, and drive efficiency across the supply chain. If you want to build solutions that have real impact on the lives of others, we invite you to join our highly talented software team as a Microsoft Dynamics Nav Developer. This is an excellent opportunity to make a meaningful impact within a collaborative and forward-thinking environment.
        Are you passionate about creating smart, effective solutions that make a real difference? In a system as critical and complex as the NHS, poor inventory management doesn’t just waste money — it risks lives, reduces efficiency, and erodes trust. Improvements in digital tracking, data integration, and supply chain coordination are essential to mitigate these effects. At Ingenica Solutions we build smart inventory management software solutions to help the healthcare sector gain control over inventory, track usage at the point of care, and drive efficiency across the supply chain. If you want to build solutions that have real impact on the lives of others, we invite you to join our highly talented software team as a Microsoft Dynamics Nav Developer. This is an excellent opportunity to make a meaningful impact within a collaborative and forward-thinking environment.
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        NEW

        Test Analyst

        Hays
        E1, East London
        £35000.0 - £45000.0 per annum + Competitive + benefits package
        Hays Software Engineering are looking for a Test Analyst to join a renowned London based Insurer with huge growth plans. What you will be doing:You will be part of a lean family type IT team responsible for all things tech operations and directly responsible for implementing a testing environment for electronic trading platforms. As well as the above, you will be responsible for liaising with internal stakeholders such as Actuarial, Underwriting and Finance professionals to ensure the smooth implementation of system updates. This specific client operates their IT team with 0 ego's. Therefore, there may be an element of mentoring newer members of the team and assisting where the business requires. What you'll receive in return:The opportunity to work for a people centric business that will allow you to own full trading platform implementations, from design to deploy, .
        Hays Software Engineering are looking for a Test Analyst to join a renowned London based Insurer with huge growth plans. What you will be doing:You will be part of a lean family type IT team responsible for all things tech operations and directly responsible for implementing a testing environment for electronic trading platforms. As well as the above, you will be responsible for liaising with internal stakeholders such as Actuarial, Underwriting and Finance professionals to ensure the smooth implementation of system updates. This specific client operates their IT team with 0 ego's. Therefore, there may be an element of mentoring newer members of the team and assisting where the business requires. What you'll receive in return:The opportunity to work for a people centric business that will allow you to own full trading platform implementations, from design to deploy, .
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        NEW

        AI/ML engineer - SC clearance

        LA International Computer Consultants Ltd
        EC1, City of London
        £500 - £550 per day
        Role: Backend engineer - Rate: IR35 Status yet to be determined - Location: Remote with occasional travel to London or Corsham - Duration: 6-month initial contract - SC clearance required. About the Role - You are a systems thinker with deep experience in backend engineering and distributed - data infrastructure. You thrive in high-stakes environments, know how to ship reliable - code fast, and are pragmatic about trade-o=s. You understand the unique constraints of - experimental, edge-deployable systems, especially in air-gapped environments where - resilience and autonomy matter most. This role focuses on building and adapting backend services to support experimental AI - systems deployed in sensitive Defence contexts. You will help create and manage - robust, portable pipelines for data ingestion, orchestration, model interaction, and - querying - all within a clas
        Role: Backend engineer - Rate: IR35 Status yet to be determined - Location: Remote with occasional travel to London or Corsham - Duration: 6-month initial contract - SC clearance required. About the Role - You are a systems thinker with deep experience in backend engineering and distributed - data infrastructure. You thrive in high-stakes environments, know how to ship reliable - code fast, and are pragmatic about trade-o=s. You understand the unique constraints of - experimental, edge-deployable systems, especially in air-gapped environments where - resilience and autonomy matter most. This role focuses on building and adapting backend services to support experimental AI - systems deployed in sensitive Defence contexts. You will help create and manage - robust, portable pipelines for data ingestion, orchestration, model interaction, and - querying - all within a clas
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        NEW
        On behalf of FCDO, we are looking for an Oracle Cloud Integration Specialist (Inside IR35) for a 9 month contract based Remotely with occasional travel to London. The Foreign, Commonwealth & Development Office (FCDO) pursues our national interests and projects the UK as a force for good in the world. We promote the interests of British citizens, safeguard the UK's security, defend our values, reduce poverty, and tackle global challenges with our international partners. * Design, develop, and maintain integration flows using Oracle Integration Cloud (OIC) to connect Oracle SaaS and on-premise applications. * Build and customise user interfaces and applications in Oracle VBCS, ensuring seamless interaction with integrated services. * Collaborate with business stakeholders to capture integration requirements and translate them into technical solutions.
        On behalf of FCDO, we are looking for an Oracle Cloud Integration Specialist (Inside IR35) for a 9 month contract based Remotely with occasional travel to London. The Foreign, Commonwealth & Development Office (FCDO) pursues our national interests and projects the UK as a force for good in the world. We promote the interests of British citizens, safeguard the UK's security, defend our values, reduce poverty, and tackle global challenges with our international partners. * Design, develop, and maintain integration flows using Oracle Integration Cloud (OIC) to connect Oracle SaaS and on-premise applications. * Build and customise user interfaces and applications in Oracle VBCS, ensuring seamless interaction with integrated services. * Collaborate with business stakeholders to capture integration requirements and translate them into technical solutions.
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        FEATURED

        Data Engineer - AI Projects

        Henderson Scott
        Stevenage, Hertfordshire, SG1 2DA
        £50000.00 - £55000.00 per annum + Bonus, + Substantial Benefits
        Data Engineer - Generative AI Projects?? Hybrid | 2-3 Days On-Site | Up to £55,000 + Bonus + Package?? British Citizens Only | BPSS Clearance Required - We're hiring a Data Engineer with a passion for automation, clean pipelines, and the future of AI. This is your chance to shape how data powers Generative AI and NLP tools in a secure, high-tech organisation working on projects that matter. If you're keen to work on innovative internal use-cases - from AI assistants to intelligent search and document automation - this is the perfect next step. What You'll Be Doing * Building and maintaining data pipelines across structured & unstructured sources * Collaborating with internal teams to support Generative AI and NLP projects * Ensuring data is secure, compliant, high-quality, and easy to access * Bringing your ideas to the table as we explore new tools and technologies
        Data Engineer - Generative AI Projects?? Hybrid | 2-3 Days On-Site | Up to £55,000 + Bonus + Package?? British Citizens Only | BPSS Clearance Required - We're hiring a Data Engineer with a passion for automation, clean pipelines, and the future of AI. This is your chance to shape how data powers Generative AI and NLP tools in a secure, high-tech organisation working on projects that matter. If you're keen to work on innovative internal use-cases - from AI assistants to intelligent search and document automation - this is the perfect next step. What You'll Be Doing * Building and maintaining data pipelines across structured & unstructured sources * Collaborating with internal teams to support Generative AI and NLP projects * Ensuring data is secure, compliant, high-quality, and easy to access * Bringing your ideas to the table as we explore new tools and technologies
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        FEATURED
        6 Month contract - 40 hours per week - Inside IR35 - Hybrid 1 office day - London Farringdon office address: 47-53 Charterhouse St, London, EC1M 6PB - We are seeking a talented and motivated Frontend Developer with strong expertise in TypeScript to join our growing development team. In this role, you will work on building high-quality, scalable, and responsive web applications using React and TypeScript. You will collaborate closely with cross-functional teams to deliver exceptional user experiences, optimize performance, and contribute to the overall architecture of our platform. Initially it will be a six-month contract but there is potential for it to be extended. The role is Hybrid, with one day a week being based in their London office. It is a full-time role, 40 hours per week. * Develop and maintain scalable and responsive web applications using React.js and Ty
        6 Month contract - 40 hours per week - Inside IR35 - Hybrid 1 office day - London Farringdon office address: 47-53 Charterhouse St, London, EC1M 6PB - We are seeking a talented and motivated Frontend Developer with strong expertise in TypeScript to join our growing development team. In this role, you will work on building high-quality, scalable, and responsive web applications using React and TypeScript. You will collaborate closely with cross-functional teams to deliver exceptional user experiences, optimize performance, and contribute to the overall architecture of our platform. Initially it will be a six-month contract but there is potential for it to be extended. The role is Hybrid, with one day a week being based in their London office. It is a full-time role, 40 hours per week. * Develop and maintain scalable and responsive web applications using React.js and Ty
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        Senior Backend Engineer - Data Pipelines - £600.day

        Wilson Brown Limited
        EC1, City of London
        Up to £600 per day Outside IR35 & Fully Remote (UK)
        Senior Software Engineer - Data & Backend - Up to £600.day outside IR35 - LegalTech | Remote (UK) | Python | GCP | Data Pipelines | Event-Based Solutions - Were helping a seed-funded LegalTech startup build their MVP. They need a Data-Focused Senior Software Engineer with a passion for building data pipelines and backend engineering using Python. If you crave a role where you can build 0-1 and have big impact then look no further! * Location: Remote (UK Only) * Outside IR35 * Up to £600.day * 3 months (possible extension) As the Software Engineer on this project, youll design and build data pipelines in Python and GCP, deliver high-performance backend systems, and implement IaC to ensure everything scales. * Build backend services and data pipelines from scratch * Architect event-driven solutions in GCP with Pub/Sub & Cloud Run
        Senior Software Engineer - Data & Backend - Up to £600.day outside IR35 - LegalTech | Remote (UK) | Python | GCP | Data Pipelines | Event-Based Solutions - Were helping a seed-funded LegalTech startup build their MVP. They need a Data-Focused Senior Software Engineer with a passion for building data pipelines and backend engineering using Python. If you crave a role where you can build 0-1 and have big impact then look no further! * Location: Remote (UK Only) * Outside IR35 * Up to £600.day * 3 months (possible extension) As the Software Engineer on this project, youll design and build data pipelines in Python and GCP, deliver high-performance backend systems, and implement IaC to ensure everything scales. * Build backend services and data pipelines from scratch * Architect event-driven solutions in GCP with Pub/Sub & Cloud Run
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        Product Manager - Post Trade

        SG Technology
        EC1A, City of London
        £90,000 per annum Plus Bonus & Benefits
        My client, a leading global investment bank, is seeking an experienced Product Manager to - position technology as a strategic asset and to shape how a growing product organisation - supports worldwide business growth. Reporting to the Lead Product Manager for Investments, the successful candidate will own the alignment and product development of the banks - investment-operations proposition, covering custody, IBOR, ABOR, trade capture, dealing and - settlements across multiple asset classes. Working within a long-standing Agile team, the - Product Manager will integrate and modernise critical post-trade platforms, delivering innovative, scalable solutions while cultivating a strong partnership between technology and the global - business. Key Responsibilities * Serve as subject-matter expert for engineering teams and third-party vendors, ensuringclarity around delive
        My client, a leading global investment bank, is seeking an experienced Product Manager to - position technology as a strategic asset and to shape how a growing product organisation - supports worldwide business growth. Reporting to the Lead Product Manager for Investments, the successful candidate will own the alignment and product development of the banks - investment-operations proposition, covering custody, IBOR, ABOR, trade capture, dealing and - settlements across multiple asset classes. Working within a long-standing Agile team, the - Product Manager will integrate and modernise critical post-trade platforms, delivering innovative, scalable solutions while cultivating a strong partnership between technology and the global - business. Key Responsibilities * Serve as subject-matter expert for engineering teams and third-party vendors, ensuringclarity around delive
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        Guidewire Developer

        Pioneer Search
        City of London, London
        £55000.00 - £65000.00 per annum
        Location: London / Hybrid (2 days in the office, 3 days from home) Salary: £55,000 - £65,000 - A Guidewire developer is required for a leading Lloyd's of London Insurance organisation, implementing a Guidewire Claims system. This is to join a brand-new team onboarding and implementing a Guidewire Claims system. You will have experience working with Guidewire, across either PolicyCenter BillingCenter or ClaimsCenter. As this is an initial migration and implementation you will be essential in assisting the organisation migrate from their existing claims platform to Claims Center which will be hosted in Guidewires Cloud. Ability to interact with stakeholders and to be involved in decisions affecting the implementation due to go live in 2026 is essential. You will have experience customising Guidewire in Gosu.
        Location: London / Hybrid (2 days in the office, 3 days from home) Salary: £55,000 - £65,000 - A Guidewire developer is required for a leading Lloyd's of London Insurance organisation, implementing a Guidewire Claims system. This is to join a brand-new team onboarding and implementing a Guidewire Claims system. You will have experience working with Guidewire, across either PolicyCenter BillingCenter or ClaimsCenter. As this is an initial migration and implementation you will be essential in assisting the organisation migrate from their existing claims platform to Claims Center which will be hosted in Guidewires Cloud. Ability to interact with stakeholders and to be involved in decisions affecting the implementation due to go live in 2026 is essential. You will have experience customising Guidewire in Gosu.
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        Senior Data Engineer

        Anson Mccade
        WC1, Central London, W C1R
        GBP 65,000.00 - 70,000.00 per year;GBP 57,000.00 per year;GBP 64,000.0
        £65,000 - 70,000 GBP - Hybrid WORKING - Location: Central London, Greater London - United Kingdom Type: Permanent £57,000 - £64,000 (London up to £70,000) + Excellent Benefits - Hybrid / UK-Wide Locations - A respected digital consultancy is on the lookout for a Senior Data Engineer to join its growing data practice. This is a brilliant opportunity to be part of a human-focused, tech-forward environment that delivers bespoke data solutions for clients in both the public and private sectors. Senior Engineers here don't just write code-they shape outcomes. You'll join a collaborative, agile team that values technical excellence, continuous improvement, and inclusive delivery. The consultancy is known for combining engineering, data and user-centred design to build impactful platforms that matter. In this role, you'll take the lead in crafting data pipelines, designing c
        £65,000 - 70,000 GBP - Hybrid WORKING - Location: Central London, Greater London - United Kingdom Type: Permanent £57,000 - £64,000 (London up to £70,000) + Excellent Benefits - Hybrid / UK-Wide Locations - A respected digital consultancy is on the lookout for a Senior Data Engineer to join its growing data practice. This is a brilliant opportunity to be part of a human-focused, tech-forward environment that delivers bespoke data solutions for clients in both the public and private sectors. Senior Engineers here don't just write code-they shape outcomes. You'll join a collaborative, agile team that values technical excellence, continuous improvement, and inclusive delivery. The consultancy is known for combining engineering, data and user-centred design to build impactful platforms that matter. In this role, you'll take the lead in crafting data pipelines, designing c
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        PREMIUM

        Senior Front End Engineer

        Ncounter LTD
        EC2, City of London
        From £600 to £700 per annum Inside IR35
        Front-End Engineer (Contract) Secure AI Systems for Defence - Contract | Inside IR35 | £600£700/day | Hybrid / Secure Site | SC/DV Cleared | UK Nationals Only - Contract Length: Initial 3-month engagement (rolling), part of a 69 month roadmap - Were supporting a cutting-edge AI organisation delivering a government-funded mission into the Defence sector. Theyre seeking a talented Front-End Engineer to help build and iterate on user interfaces that bring complex machine learning outputs to life - transcription analysis, graph-based risk models, and natural-language interfaces for end users in secure, disconnected environments. This is not your typical dashboard gig. Its a chance to design and build offline-first, insight-rich tools that support real-world decision-makingwhere clarity and usability can have operational consequences. o Live and retrospective transcription
        Front-End Engineer (Contract) Secure AI Systems for Defence - Contract | Inside IR35 | £600£700/day | Hybrid / Secure Site | SC/DV Cleared | UK Nationals Only - Contract Length: Initial 3-month engagement (rolling), part of a 69 month roadmap - Were supporting a cutting-edge AI organisation delivering a government-funded mission into the Defence sector. Theyre seeking a talented Front-End Engineer to help build and iterate on user interfaces that bring complex machine learning outputs to life - transcription analysis, graph-based risk models, and natural-language interfaces for end users in secure, disconnected environments. This is not your typical dashboard gig. Its a chance to design and build offline-first, insight-rich tools that support real-world decision-makingwhere clarity and usability can have operational consequences. o Live and retrospective transcription
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        Microsoft Active Directory Admin

        Infoplus Technologies UK Ltd
        East London, London, E1 7JF
        Unspecified
        Programming in Azure / Microsoft capable languages, such as ARM / Bicep, PowerShell, yaml, Python and a understanding of Azure API's from the data plane
        Programming in Azure / Microsoft capable languages, such as ARM / Bicep, PowerShell, yaml, Python and a understanding of Azure API's from the data plane
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        NEW
        About Us - With Intelligence is a leading provider of data and insights for the global asset management industry. We are scaling up our technological capabilities, harnessing the power of advanced data systems, AI, and modern cloud-based infrastructure to build a flexible, event-driven platform that supports our growing suite of digital products. We're assembling a top-tier London-based engineering team to lead this transformation. This role offers the opportunity to be a key contributor to our technology evolution, leveraging your deep .NET experience to influence product direction, mentor teams, and ensure our systems are robust, scalable, and modern. Role Overview - As a .Net Specialist you will be leading teams in the design, development, and implementation of software solutions using the .NET framework. You will act as a technical authority across multiple produc
        About Us - With Intelligence is a leading provider of data and insights for the global asset management industry. We are scaling up our technological capabilities, harnessing the power of advanced data systems, AI, and modern cloud-based infrastructure to build a flexible, event-driven platform that supports our growing suite of digital products. We're assembling a top-tier London-based engineering team to lead this transformation. This role offers the opportunity to be a key contributor to our technology evolution, leveraging your deep .NET experience to influence product direction, mentor teams, and ensure our systems are robust, scalable, and modern. Role Overview - As a .Net Specialist you will be leading teams in the design, development, and implementation of software solutions using the .NET framework. You will act as a technical authority across multiple produc
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        Join the API Revolution at GraviteeWhere Innovation Meets Growth - Since our beginnings in 2015, Gravitee has grown into a global force, recognized as a 2024 Gartner Magic Quadrant Leader for API Management. What started with four developers challenging the complexities of APIs has evolved into a revolutionary platform powering API and event stream ecosystems worldwide. Be part of a team thats redefining whats possible in API management, and shaping the future of digital transformation. Gravitee.io is taking APIs to the next level we are the premier, open source API platform and we want everyone to know how amazing our software is. * Ability to work for one of the fastest-growing companies and alongside some of the most talented people in the API technology sector
        Join the API Revolution at GraviteeWhere Innovation Meets Growth - Since our beginnings in 2015, Gravitee has grown into a global force, recognized as a 2024 Gartner Magic Quadrant Leader for API Management. What started with four developers challenging the complexities of APIs has evolved into a revolutionary platform powering API and event stream ecosystems worldwide. Be part of a team thats redefining whats possible in API management, and shaping the future of digital transformation. Gravitee.io is taking APIs to the next level we are the premier, open source API platform and we want everyone to know how amazing our software is. * Ability to work for one of the fastest-growing companies and alongside some of the most talented people in the API technology sector
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        Integration Analyst

        The Princess Alexandra Hospital NHS Trust
        Harlow, London
        Competitive
        Job summary - As an HL7 Integration Analyst, you will be responsible for the development, deployment, analysis, and maintenance of healthcare integration solutions. You will focus on delivering robust interoperability across systems by leveraging standards such as HL7 (v2 and FHIR), Rhapsody Integration Engine, APIs, and custom code solutions. In addition to developing and supporting integration points, you will play a critical role in conducting integration analysis to ensure clinical and operational requirements are accurately interpreted and met through technical delivery. Main duties of the job - This role requires an exceptionally high level of technical expertise. The post holder is expected to have the skill to routinely analyse and solve highly complex technical problems without the need to call upon others for advice, whilst providing technical guidance and s
        Job summary - As an HL7 Integration Analyst, you will be responsible for the development, deployment, analysis, and maintenance of healthcare integration solutions. You will focus on delivering robust interoperability across systems by leveraging standards such as HL7 (v2 and FHIR), Rhapsody Integration Engine, APIs, and custom code solutions. In addition to developing and supporting integration points, you will play a critical role in conducting integration analysis to ensure clinical and operational requirements are accurately interpreted and met through technical delivery. Main duties of the job - This role requires an exceptionally high level of technical expertise. The post holder is expected to have the skill to routinely analyse and solve highly complex technical problems without the need to call upon others for advice, whilst providing technical guidance and s
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        MMC Corporate - We are looking for a talented and motivated individual to join our Cloud Platforms team at Marsh McLennan, based in Liverpool, United Kingdom. This is a hybrid role, requiring a minimum of three days per week in the office. * Operational Support for public cloud technology solutions, primarily focused on the AWS or Azure cloud platforms. * Obtain and maintain an in-depth understanding of AWS and Azure public cloud technologies to ensure all appropriate options are considered to support business initiatives. * Act as a consultant and subject matter expert for Project Managers, Developers, and Engineering teams, to resolve technical obstacles and improve the product's vision. * Work closely with multiple Project Management and Software Engineering teams on understanding ways to improve IaaS and PaaS service offerings.
        MMC Corporate - We are looking for a talented and motivated individual to join our Cloud Platforms team at Marsh McLennan, based in Liverpool, United Kingdom. This is a hybrid role, requiring a minimum of three days per week in the office. * Operational Support for public cloud technology solutions, primarily focused on the AWS or Azure cloud platforms. * Obtain and maintain an in-depth understanding of AWS and Azure public cloud technologies to ensure all appropriate options are considered to support business initiatives. * Act as a consultant and subject matter expert for Project Managers, Developers, and Engineering teams, to resolve technical obstacles and improve the product's vision. * Work closely with multiple Project Management and Software Engineering teams on understanding ways to improve IaaS and PaaS service offerings.
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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.