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        Hertfordshire
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        • Hertfordshire

        39 Contract API jobs in Hertford + 20 miles

        Fidessa Developer Java - Capital Markets

        Client Server
        The City, EC3
        £100000 - £135000 per annum + bonus + benefits
        Fidessa Developer (Java Spring Boot API) London to £135k - As a Fidessa Developer (Java Spring Boot API) you will receive a competitive - Apply now to find out more about this Fidessa Developer (Java Spring Boot API) opportunity.
        Fidessa Developer (Java Spring Boot API) London to £135k - As a Fidessa Developer (Java Spring Boot API) you will receive a competitive - Apply now to find out more about this Fidessa Developer (Java Spring Boot API) opportunity.
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        NEWPREMIUM
        AMS is a global workforce solutions partner committed to creating inclusive, dynamic, and future-ready workplaces. We help organisations adapt, grow, and thrive in an ever-evolving world by building, shaping, and optimising diverse talent strategies. Our Contingent Workforce Solutions (CWS) is one of our service offerings. Acting as an extension of their recruitment teams, we connect them with skilled interim and temporary professionals, fostering workplaces where everyone can contribute and succeed. Our client, a major UK retail bank, provides every day banking services to over 17 million retail customers. The banks expertise and services span across Business Services, Corporate banking, Wealth Management, Group Functions, Retail and Investment Banking. On behalf of this organisation, AMS are looking for 3 - Full Stack Developers for acontract until end of 2025 based
        AMS is a global workforce solutions partner committed to creating inclusive, dynamic, and future-ready workplaces. We help organisations adapt, grow, and thrive in an ever-evolving world by building, shaping, and optimising diverse talent strategies. Our Contingent Workforce Solutions (CWS) is one of our service offerings. Acting as an extension of their recruitment teams, we connect them with skilled interim and temporary professionals, fostering workplaces where everyone can contribute and succeed. Our client, a major UK retail bank, provides every day banking services to over 17 million retail customers. The banks expertise and services span across Business Services, Corporate banking, Wealth Management, Group Functions, Retail and Investment Banking. On behalf of this organisation, AMS are looking for 3 - Full Stack Developers for acontract until end of 2025 based
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        NEWFEATURED

        Back End Integration Engineer

        I3 Resourcing Limited
        The City, EC3V 3ND
        £70000 - £80000 per annum + + BENS + BONUS
        Strong experience in application and integration design, including microservices architecture and API lifecycle management. o API Management, Service Bus, Logic Apps, Azure Functions
        Strong experience in application and integration design, including microservices architecture and API lifecycle management. o API Management, Service Bus, Logic Apps, Azure Functions
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        Contract / Outside IR35 - A leading UK-based organisation is undergoing a strategic transformation of its enterprise systems, with Workday at the core of its HR and finance operations. We're seeking a Lead Integration Architect to design and oversee the integration landscape, ensuring seamless data flows across platforms using Workato. Key Responsibilities * Define and lead integration architecture across Workday and other enterprise platforms * Develop scalable, reusable integration patterns using Workato and other middleware tools * Ensure alignment with enterprise architecture principles and IT governance * Collaborate with Workday implementation teams to ensure integration readiness * Design and implement data flows between Workday and legacy systems * Support data migration, validation, and reconciliation * Own Workato platform governance, performance, and roadma
        Contract / Outside IR35 - A leading UK-based organisation is undergoing a strategic transformation of its enterprise systems, with Workday at the core of its HR and finance operations. We're seeking a Lead Integration Architect to design and oversee the integration landscape, ensuring seamless data flows across platforms using Workato. Key Responsibilities * Define and lead integration architecture across Workday and other enterprise platforms * Develop scalable, reusable integration patterns using Workato and other middleware tools * Ensure alignment with enterprise architecture principles and IT governance * Collaborate with Workday implementation teams to ensure integration readiness * Design and implement data flows between Workday and legacy systems * Support data migration, validation, and reconciliation * Own Workato platform governance, performance, and roadma
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        NEW

        Mulesoft Developer

        Reed Technology
        WC2A, Central London
        £60000 - £69000 per annum + Plus Benefits
        Collaborate with Data Analysts, Architects, and system owners to improve data quality and support API/Middleware-based data management. * Full lifecycle development experience on the Mulesoft Anypoint Platform (Design Centre, Exchange, Studio, API Manager, Runtime Manager). * Proficiency in RESTful API development and working with XML, XSLT, and XSD.
        Collaborate with Data Analysts, Architects, and system owners to improve data quality and support API/Middleware-based data management. * Full lifecycle development experience on the Mulesoft Anypoint Platform (Design Centre, Exchange, Studio, API Manager, Runtime Manager). * Proficiency in RESTful API development and working with XML, XSLT, and XSD.
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        NEW
        Perform Dataverse customizations, SQL queries, and CRUD operations using REST/Web API calls. * JavaScript (customizations & API calls)
        Perform Dataverse customizations, SQL queries, and CRUD operations using REST/Web API calls. * JavaScript (customizations & API calls)
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        NEW

        Azure Developer

        Queen Square Recruitment Limited
        EC2N, City of London
        From £500 to £600 per day inside IR35, DOE
        Develop cloud-native applications using Azure Cosmos DB (SQL API, Mongo API) * Experience with SQL API and familiarity with other APIs
        Develop cloud-native applications using Azure Cosmos DB (SQL API, Mongo API) * Experience with SQL API and familiarity with other APIs
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        NEW
        This role will focus on building scalable, innovative solutions within Salesforce Marketing Cloud and Salesforce Core Platform, including the development of custom journey activities, API integrations, and bespoke applications that enhance our marketing automation and CRM capabilities. * 5+ years of experience in Salesforce Marketing Cloud development, with a strong focus on custom journey activities and API integrations.
        This role will focus on building scalable, innovative solutions within Salesforce Marketing Cloud and Salesforce Core Platform, including the development of custom journey activities, API integrations, and bespoke applications that enhance our marketing automation and CRM capabilities. * 5+ years of experience in Salesforce Marketing Cloud development, with a strong focus on custom journey activities and API integrations.
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        NEW
        Role: Full Stack Software Engineer (UK-based, early-stage startup) £60,000 - £80,000 per annum | No Sponsorship | x3 week in office - Backed by technology start up accelerator and VC - Join a mission-driven AI startup transforming how medical and healthcare organisations collaborate. Using machine learning and advanced recommendation systems, the team helps to matchmake some of the leading Medical and Pharmaceuticalbusinesses with their extensive network of professionals. This allows them to engage seamlessly all while reducing operational costs so resources can focus on changing lives. This is the chance to work on cutting-edge AI technology at an early stage with real influence on product and architecture to help medical organisations do more with their resources while changing lives and impact clients across the US and FTSE markets.
        Role: Full Stack Software Engineer (UK-based, early-stage startup) £60,000 - £80,000 per annum | No Sponsorship | x3 week in office - Backed by technology start up accelerator and VC - Join a mission-driven AI startup transforming how medical and healthcare organisations collaborate. Using machine learning and advanced recommendation systems, the team helps to matchmake some of the leading Medical and Pharmaceuticalbusinesses with their extensive network of professionals. This allows them to engage seamlessly all while reducing operational costs so resources can focus on changing lives. This is the chance to work on cutting-edge AI technology at an early stage with real influence on product and architecture to help medical organisations do more with their resources while changing lives and impact clients across the US and FTSE markets.
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        NEWFEATURED

        Backend Engineer - London Onsite

        LJ Recruitment Limited
        EC1, City of London
        £60000 - £75000 per annum
        Backend Engineer - Scale Systems with Real Impact ?? Tired of tinkering at the edges? Want to actually shape the backbone of a platform that's transforming how the world's biggest enterprises run their tech? This is one of those rare roles where you get in early, build the foundations, and watch your work scale across global businesses. We're working with a high-growth London startup on a mission to reinvent enterprise software. Their AI-driven platform is already saving household-name customers millions in IT costs, shaving months off ERP project timelines, and making sense of the mess that legacy systems leave behind. SAP is just the beginning - they're building a whole new category of Enterprise System Intelligence. The Role * Build core systems capable of handling tens of millions of lines of code and large-scale LLM workloads.
        Backend Engineer - Scale Systems with Real Impact ?? Tired of tinkering at the edges? Want to actually shape the backbone of a platform that's transforming how the world's biggest enterprises run their tech? This is one of those rare roles where you get in early, build the foundations, and watch your work scale across global businesses. We're working with a high-growth London startup on a mission to reinvent enterprise software. Their AI-driven platform is already saving household-name customers millions in IT costs, shaving months off ERP project timelines, and making sense of the mess that legacy systems leave behind. SAP is just the beginning - they're building a whole new category of Enterprise System Intelligence. The Role * Build core systems capable of handling tens of millions of lines of code and large-scale LLM workloads.
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        NEWFEATURED

        Backend Engineer Python

        Plexus Resource Solutions Ltd
        EC1, City of London
        From £90,000 to £120,000 per annum
        Backend Engineer - On-Chain Social Network - Remote £90k £120k - Plexus are working with an on-chain social network that empowers people to express themselves, connect with others, and explore the value of imagination. To support our growth and deliver a world-class experience, were looking for a Backend Engineer to join our core product team. Responsibilities * Work closely with the team to design, build, and deliver new product features * Develop and maintain the APIs that power our platform * Contribute to system reliability by taking part in our on-call rotation - Requirements * Solid experience with Python, GraphQL, and MongoDB * Flexibility to move across the stack when needed * Hands-on experience in blockchain development * Strong product intuition with a focus on user experience - Benefits * Competitive salary * Top-quality medical, dental & vision insurance
        Backend Engineer - On-Chain Social Network - Remote £90k £120k - Plexus are working with an on-chain social network that empowers people to express themselves, connect with others, and explore the value of imagination. To support our growth and deliver a world-class experience, were looking for a Backend Engineer to join our core product team. Responsibilities * Work closely with the team to design, build, and deliver new product features * Develop and maintain the APIs that power our platform * Contribute to system reliability by taking part in our on-call rotation - Requirements * Solid experience with Python, GraphQL, and MongoDB * Flexibility to move across the stack when needed * Hands-on experience in blockchain development * Strong product intuition with a focus on user experience - Benefits * Competitive salary * Top-quality medical, dental & vision insurance
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        NEW

        Principal Consultant

        Infoplus Technologies UK Ltd
        E11, East London
        From £550 to £650 per day
        Role :Principal Consultant (Planning Lead) Work mode: Remote - Travel: Should be ready to travel to Netherlands as required (this will be required as needed, e.g. for CRP sessions etc . Apart from this role is remote in UK). Contract duration: 6 months - Location: UK - We are seeking a seasonedFunctional Leadto drive the implementation ofOracle Fusion Cloud Planning modulesincludingSupply Planning and Demand Planning, GOP and S&OP. The ideal candidate will have deep domain expertise in theCPG industry, strong functional knowledge of Oracle Cloud Planning, and experience leading multi-country rollouts in Europe. Must have skills:?? 8+ years of experience in Oracle Planning modules, with 6+ years in Oracle Fusion Cloud. Proven track record in at least 3 full-cycle Oracle Cloud Planning implementations. Strong understanding of CPG industry processes: trade promotions, di
        Role :Principal Consultant (Planning Lead) Work mode: Remote - Travel: Should be ready to travel to Netherlands as required (this will be required as needed, e.g. for CRP sessions etc . Apart from this role is remote in UK). Contract duration: 6 months - Location: UK - We are seeking a seasonedFunctional Leadto drive the implementation ofOracle Fusion Cloud Planning modulesincludingSupply Planning and Demand Planning, GOP and S&OP. The ideal candidate will have deep domain expertise in theCPG industry, strong functional knowledge of Oracle Cloud Planning, and experience leading multi-country rollouts in Europe. Must have skills:?? 8+ years of experience in Oracle Planning modules, with 6+ years in Oracle Fusion Cloud. Proven track record in at least 3 full-cycle Oracle Cloud Planning implementations. Strong understanding of CPG industry processes: trade promotions, di
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        NEW
        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

        Software Engineer Java AWS React - Start-up

        Client Server
        EC2A, City of London
        £90000 - £110000 per annum + equity + benefits
        Software Engineer / Developer (Java AWS React) London / WFH to £110k - Are you a technologist looking for an opportunity to be part of something big from the start? You could be progressing your career in an impactful role at a newly established Fintech start-up, set up by a small team of finance and technology entrepreneurs with a hugely successful track record. As a Software Engineer you will join a small team to build systems from the ground up, working across the full technology stack with a focus on designing, developing and deploying cloud-native microservices that form the core of the platform. You'll collaborate closely with the Lead Engineer, Architect and Product Manager to shape system design, APIs and data models to enable scalable backend logic and clean UI. You can work from home most of the time, meeting up with colleagues in London; as the company grow
        Software Engineer / Developer (Java AWS React) London / WFH to £110k - Are you a technologist looking for an opportunity to be part of something big from the start? You could be progressing your career in an impactful role at a newly established Fintech start-up, set up by a small team of finance and technology entrepreneurs with a hugely successful track record. As a Software Engineer you will join a small team to build systems from the ground up, working across the full technology stack with a focus on designing, developing and deploying cloud-native microservices that form the core of the platform. You'll collaborate closely with the Lead Engineer, Architect and Product Manager to shape system design, APIs and data models to enable scalable backend logic and clean UI. You can work from home most of the time, meeting up with colleagues in London; as the company grow
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        NEWPREMIUM

        Head of New Product Delivery (Insurance) *12 month FTC*

        Saga Group Limited
        North London, London, N1 4AC
        £70,000 - £90,000 dependent on experience + car allowance
        Head of New Product Delivery (Insurance) £70,000 - £90,000 dependent on experience + car allowance - 12 month secondment - Hybrid London/Folkestone - At Saga, were not just a business were a trusted brand, built on care, understanding, and delivering the very best for our customers. At Saga we are driving forward in our vision to continue to provide our experience customers with best-in-class insurance products that support their individual needs. In this newly created role, youll join us as Head of Product Development to lead the development of new insurance products. Reporting to the Chief Commercial Officer, you will own the new product delivery agenda, manage the backlog, and drive delivery - working closely with internal teams and partners to launch customer-focused, compliant, and commercially successful products.
        Head of New Product Delivery (Insurance) £70,000 - £90,000 dependent on experience + car allowance - 12 month secondment - Hybrid London/Folkestone - At Saga, were not just a business were a trusted brand, built on care, understanding, and delivering the very best for our customers. At Saga we are driving forward in our vision to continue to provide our experience customers with best-in-class insurance products that support their individual needs. In this newly created role, youll join us as Head of Product Development to lead the development of new insurance products. Reporting to the Chief Commercial Officer, you will own the new product delivery agenda, manage the backlog, and drive delivery - working closely with internal teams and partners to launch customer-focused, compliant, and commercially successful products.
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        NEWFEATURED
        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

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        Frequently Asked Questions

        How many contract API jobs are there in Hertford?
        There are 39 contract API jobs within 20 miles of Hertford available on CWJobs right now.

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