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        171 Contract API jobs in Hertfordshire + 20 miles

        Linux Administrator

        Randstad Digital
        City of London (EC1)
        £50000 - £55000 per annum
        Location: London (Hybrid - 2 days in office) Permanent - Availability: Immediate Joiner - About the Role - We're seeking a highly skilled Linux Administrator with strong Red Hat Enterprise Linux (RHEL) experience to join our infrastructure engineering team. The ideal candidate will bring hands-on expertise in system administration, automation, and virtualization, while maintaining a proactive engineering mindset focused on continuous improvement and efficiency. Key Responsibilities * Install, configure, and manage Red Hat Satellite servers. * Perform server implementation, upgrades, maintenance, and monitoring across environments. * Develop and maintain automation solutions using Ansible and Ansible Automation Platform (AAP). * Manage and upgrade VMware environments. * Troubleshoot and resolve system, platform, and network issues with minimal supervision.
        Location: London (Hybrid - 2 days in office) Permanent - Availability: Immediate Joiner - About the Role - We're seeking a highly skilled Linux Administrator with strong Red Hat Enterprise Linux (RHEL) experience to join our infrastructure engineering team. The ideal candidate will bring hands-on expertise in system administration, automation, and virtualization, while maintaining a proactive engineering mindset focused on continuous improvement and efficiency. Key Responsibilities * Install, configure, and manage Red Hat Satellite servers. * Perform server implementation, upgrades, maintenance, and monitoring across environments. * Develop and maintain automation solutions using Ansible and Ansible Automation Platform (AAP). * Manage and upgrade VMware environments. * Troubleshoot and resolve system, platform, and network issues with minimal supervision.
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        FEATURED

        Software Engineer

        Constant Recruitment
        Burton End, Stansted (CM24), CM22
        Up to £50,000 per annum
        Location: Bishops Stortford - Salary: Up to £50k - Do you have two years software development experience? Do you have a strong foundation in C# development? Would you enjoy working on projects that involve data integrations, security systems, and enterprise-scale solutions? This role is ideal for someone with around 2 years experience, looking to build on their skills with mentoring from senior engineers. The Company - Our client is a fast-growing technology business that designs and delivers bespoke software solutions, data integrations, and consultancy services. Since their launch in 2020, they have built a strong reputation for developing custom integrations between third-party systems and access control/security platforms, supporting sectors including higher education, commercial real estate, healthcare, and defence.
        Location: Bishops Stortford - Salary: Up to £50k - Do you have two years software development experience? Do you have a strong foundation in C# development? Would you enjoy working on projects that involve data integrations, security systems, and enterprise-scale solutions? This role is ideal for someone with around 2 years experience, looking to build on their skills with mentoring from senior engineers. The Company - Our client is a fast-growing technology business that designs and delivers bespoke software solutions, data integrations, and consultancy services. Since their launch in 2020, they have built a strong reputation for developing custom integrations between third-party systems and access control/security platforms, supporting sectors including higher education, commercial real estate, healthcare, and defence.
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        PREMIUM

        AI/ML Principal Engineer

        Velocity Talent Ltd
        Central London (WC1)
        £400 per day £400 a day inside IR35
        Urgent 12-month Hybrid AI/Machine Learning (ML) engineer role paying £400 a day inside IR35 in central London with 2-3 days in the office a week. Start before Christmas, I need to send candidates today for this to be possible. Interviews next week apply asap/Today - Build and optimize AI/ML pipelines for predictive modelling, NLP, and generative AI applications. Perform Exploratory Data Analysis (EDA), data mining, and visualization to extract insights. Design and implement Big Data solutions using Hadoop, Spark, PySpark, and Data Lake architectures. Develop and deploy ML models (supervised, unsupervised, tree-based, ensemble methods). Implement deep learning architectures (CNN, RNN, LSTM) using TensorFlow, PyTorch, and Keras. Work on NLP and Generative AI tasks including embeddings, transformers (BERT, GPT), and OpenAI APIs.
        Urgent 12-month Hybrid AI/Machine Learning (ML) engineer role paying £400 a day inside IR35 in central London with 2-3 days in the office a week. Start before Christmas, I need to send candidates today for this to be possible. Interviews next week apply asap/Today - Build and optimize AI/ML pipelines for predictive modelling, NLP, and generative AI applications. Perform Exploratory Data Analysis (EDA), data mining, and visualization to extract insights. Design and implement Big Data solutions using Hadoop, Spark, PySpark, and Data Lake architectures. Develop and deploy ML models (supervised, unsupervised, tree-based, ensemble methods). Implement deep learning architectures (CNN, RNN, LSTM) using TensorFlow, PyTorch, and Keras. Work on NLP and Generative AI tasks including embeddings, transformers (BERT, GPT), and OpenAI APIs.
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        C# Developer

        VIQU IT Recruitment
        The City, City of London (EC4), EC4M 7JH
        £300 - 400 per day
        A client is seeking an experienced C# Developer to join their development team and support a key internal initiative. In this role, you'll also play a major part in configuring, enhancing, and integrating Microsoft Dynamics 365 within the business. As a Software Developer, you’ll collaborate closely with senior stakeholders to deliver clean, efficient, and reliable code that underpins critical business applications. * Produce well-structured and clearly documented C# / .NET code. * Configure, customise, and maintain Microsoft Dynamics 365. * Build and support integrations across Dynamics 365 and other systems. * Develop plugins, workflows, and bespoke components within the Dynamics ecosystem. * Work seamlessly with cross-functional teams in a fully remote setting. * Take part in code reviews and contribute to help define best practices.
        A client is seeking an experienced C# Developer to join their development team and support a key internal initiative. In this role, you'll also play a major part in configuring, enhancing, and integrating Microsoft Dynamics 365 within the business. As a Software Developer, you’ll collaborate closely with senior stakeholders to deliver clean, efficient, and reliable code that underpins critical business applications. * Produce well-structured and clearly documented C# / .NET code. * Configure, customise, and maintain Microsoft Dynamics 365. * Build and support integrations across Dynamics 365 and other systems. * Develop plugins, workflows, and bespoke components within the Dynamics ecosystem. * Work seamlessly with cross-functional teams in a fully remote setting. * Take part in code reviews and contribute to help define best practices.
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        We're seeking an experienced Senior Full Stack Developer to join our clients expanding technology team. In this role, you'll be instrumental in designing, developing, and maintaining high-quality, scalable web applications. You'll work across the full stack, collaborating closely with colleagues to deliver impactful, user-focused solutions. Key Responsibilities * Develop and maintain modern web applications using C# .NET (Core/Framework) and React. * Work with cross-functional teams to define requirements and deliver new features. * Write clean, scalable, and well-tested code. * Diagnose and resolve application issues to ensure optimal performance. You will have - * 3+ years' experience as a Full Stack Developer. * Strong hands-on expertise with C# .NET (Core) and React. * Good understanding of REST APIs, SQL/NoSQL databases, and Git version control.
        We're seeking an experienced Senior Full Stack Developer to join our clients expanding technology team. In this role, you'll be instrumental in designing, developing, and maintaining high-quality, scalable web applications. You'll work across the full stack, collaborating closely with colleagues to deliver impactful, user-focused solutions. Key Responsibilities * Develop and maintain modern web applications using C# .NET (Core/Framework) and React. * Work with cross-functional teams to define requirements and deliver new features. * Write clean, scalable, and well-tested code. * Diagnose and resolve application issues to ensure optimal performance. You will have - * 3+ years' experience as a Full Stack Developer. * Strong hands-on expertise with C# .NET (Core) and React. * Good understanding of REST APIs, SQL/NoSQL databases, and Git version control.
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        We're seeking an experienced Senior Full Stack Developer to join our clients expanding technology team. In this role, you'll be instrumental in designing, developing, and maintaining high-quality, scalable web applications. You'll work across the full stack, collaborating closely with colleagues to deliver impactful, user-focused solutions. Key Responsibilities * Develop and maintain modern web applications using C# .NET (Core/Framework) and React. * Work with cross-functional teams to define requirements and deliver new features. * Write clean, scalable, and well-tested code. * Diagnose and resolve application issues to ensure optimal performance. You will have - * 3+ years' experience as a Full Stack Developer. * Strong hands-on expertise with C# .NET (Core) and React. * Good understanding of REST APIs, SQL/NoSQL databases, and Git version control.
        We're seeking an experienced Senior Full Stack Developer to join our clients expanding technology team. In this role, you'll be instrumental in designing, developing, and maintaining high-quality, scalable web applications. You'll work across the full stack, collaborating closely with colleagues to deliver impactful, user-focused solutions. Key Responsibilities * Develop and maintain modern web applications using C# .NET (Core/Framework) and React. * Work with cross-functional teams to define requirements and deliver new features. * Write clean, scalable, and well-tested code. * Diagnose and resolve application issues to ensure optimal performance. You will have - * 3+ years' experience as a Full Stack Developer. * Strong hands-on expertise with C# .NET (Core) and React. * Good understanding of REST APIs, SQL/NoSQL databases, and Git version control.
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        Key Responsibilities - AEM Development: Design, develop, and maintain AEM components, templates, workflows, and OSGi services using Java and the Sling framework. Front-End Integration: Collaborate with UX/UI teams to integrate front-end code (HTML, CSS, JavaScript/React/Angular) into AEM for a responsive user experience. System Integration: Integrate AEM with other core systems and Adobe Experience Cloud products (like Adobe Analytics, Adobe Target, and Adobe Campaign) using APIs (e.g., RESTful). Deployment and Support: Participate in the deployment process, conduct unit and system testing, and troubleshoot/debug issues in AEM environments. Best Practices: Ensure code quality, security, and performance by adhering to AEM and general software development best practices (e.g., in an Agile environment). AEM Sites Assets - AEM Components - AEM Core Development - Adobe Exp
        Key Responsibilities - AEM Development: Design, develop, and maintain AEM components, templates, workflows, and OSGi services using Java and the Sling framework. Front-End Integration: Collaborate with UX/UI teams to integrate front-end code (HTML, CSS, JavaScript/React/Angular) into AEM for a responsive user experience. System Integration: Integrate AEM with other core systems and Adobe Experience Cloud products (like Adobe Analytics, Adobe Target, and Adobe Campaign) using APIs (e.g., RESTful). Deployment and Support: Participate in the deployment process, conduct unit and system testing, and troubleshoot/debug issues in AEM environments. Best Practices: Ensure code quality, security, and performance by adhering to AEM and general software development best practices (e.g., in an Agile environment). AEM Sites Assets - AEM Components - AEM Core Development - Adobe Exp
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        Senior Automation QA - Remote

        Exposed Solutions
        Central London (W1)
        From £40,000 to £45,000 per annum
        SeniorAutomationQAAIStartup(UK)|BuildQAfromScratch - OurclientisanambitiousAIstartupbuildingcutting-edgeproducts,andwerelookingforaSeniorAutomationQAwhocanowntestautomationfromdayone. IfyoulovegreenfieldchallengesandwanttoshapetheentireQAfunctioninafast-growingtechcompany,thisisforyou. Whatyoulldo * BuildourautomationframeworksandQAprocessesfromscratch * Leadteststrategyacrossbackend,frontend&APIs * CreateautomatedtestsuitesintegratedintoCI/CD * CollaboratewithEngineering&MLteamstoensurehigh-qualityreleases * Championqualityacrosstheorganisation - Whatwerelookingfor * 5+yearsQAexperiencewithastrongautomationfocus * Provenexperiencesettinguptestautomationinastartuporgreenfieldenvironment * StrongskillswithPython/JavaScripttestframeworks * ExperiencewithPlaywright,Cypressorsimilar * Cloud&CI/CDexposure(AWS/GCP/Azure,GitHubActions,GitLabCI) * Bonus:experiencetestingAI/ML
        SeniorAutomationQAAIStartup(UK)|BuildQAfromScratch - OurclientisanambitiousAIstartupbuildingcutting-edgeproducts,andwerelookingforaSeniorAutomationQAwhocanowntestautomationfromdayone. IfyoulovegreenfieldchallengesandwanttoshapetheentireQAfunctioninafast-growingtechcompany,thisisforyou. Whatyoulldo * BuildourautomationframeworksandQAprocessesfromscratch * Leadteststrategyacrossbackend,frontend&APIs * CreateautomatedtestsuitesintegratedintoCI/CD * CollaboratewithEngineering&MLteamstoensurehigh-qualityreleases * Championqualityacrosstheorganisation - Whatwerelookingfor * 5+yearsQAexperiencewithastrongautomationfocus * Provenexperiencesettinguptestautomationinastartuporgreenfieldenvironment * StrongskillswithPython/JavaScripttestframeworks * ExperiencewithPlaywright,Cypressorsimilar * Cloud&CI/CDexposure(AWS/GCP/Azure,GitHubActions,GitLabCI) * Bonus:experiencetestingAI/ML
        more

        Data Technical Lead

        Deerfoot Recruitment Solutions
        Moorgate, City of London (EC2), EC2Y
        Benefits Package
        Data Engineering Technical Lead - Global Investment Bank - London - Hybrid - Permanent - Excellent Package + Benefits - We are working with one of the world's leading banking groups, who we have partnered with for 15 years. We are seeking an experienced Data Architect / EDM Developer / Data Engineering Lead to join their International Technology team in London. You will be a key part of the Architecture, Middleware, Data & Enterprise Services (AMD) division, driving data engineering, integration and automation initiatives across our clients EMEA banking and securities entities. This is a hands-on leadership role, combining technical expertise with mentoring and team leadership. Key Responsibilities * Architect, design and deliver enterprise-wide EDM and data solutions. * Lead and mentor EDM developers, ensuring high-quality, cost-effective delivery.
        Data Engineering Technical Lead - Global Investment Bank - London - Hybrid - Permanent - Excellent Package + Benefits - We are working with one of the world's leading banking groups, who we have partnered with for 15 years. We are seeking an experienced Data Architect / EDM Developer / Data Engineering Lead to join their International Technology team in London. You will be a key part of the Architecture, Middleware, Data & Enterprise Services (AMD) division, driving data engineering, integration and automation initiatives across our clients EMEA banking and securities entities. This is a hands-on leadership role, combining technical expertise with mentoring and team leadership. Key Responsibilities * Architect, design and deliver enterprise-wide EDM and data solutions. * Lead and mentor EDM developers, ensuring high-quality, cost-effective delivery.
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        FEATURED

        Senior Full Stack PHP Developer (Remote)

        Digital Appointments
        Bloomsbury, Central London (WC1), WC1N 3AX
        From £50,000 to £60,000 per annum
        A fantastic, fully remote opportunity! Are you an experienced Full Stack PHP Developer with React? This well-established SaaS platform used by businesses across the UK prides itself on providing a stable, reliable, and feature-rich service to its large portfolio of clients. They foster a collaborative, supportive, and fully remote working environment where talented developers can really thrive. We are seeking a talented and experienced Full Stack PHP Developer to join their dedicated development team. You will play a crucial role in the ongoing development, maintenance, and enhancement of their core SaaS platform. Working across the full stack, you'll be involved in building new features, optimising existing code, and ensuring the scalability and reliability of their application. This is an excellent opportunity to contribute significantly to a great product within a
        A fantastic, fully remote opportunity! Are you an experienced Full Stack PHP Developer with React? This well-established SaaS platform used by businesses across the UK prides itself on providing a stable, reliable, and feature-rich service to its large portfolio of clients. They foster a collaborative, supportive, and fully remote working environment where talented developers can really thrive. We are seeking a talented and experienced Full Stack PHP Developer to join their dedicated development team. You will play a crucial role in the ongoing development, maintenance, and enhancement of their core SaaS platform. Working across the full stack, you'll be involved in building new features, optimising existing code, and ensuring the scalability and reliability of their application. This is an excellent opportunity to contribute significantly to a great product within a
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        Principal Software Engineer

        Fruition Group
        City of London (EC1), EC1
        £95000 - £120000 per annum
        Location: Remote first (Occasional travel to London) Salary: £95,000 - £120,000 + equity + benefits - An established, global technology business within the hospitality-tech industry is seeking an accomplished Principal Software Engineer to lead the design and delivery of next-generation digital solutions. This is an opportunity to shape greenfield projects from the ground up - architecting scalable, data-driven systems that empower venues to deliver seamless guest experiences and drive long-term innovation. What will I be doing? * Lead the technical vision and architectural direction across complex backend systems, ensuring scalability, reliability, and performance. * Partner closely with engineering leadership to define best practices, coding standards, and long-term technical strategy. * Design, develop, and oversee the delivery of robust, production-grade software
        Location: Remote first (Occasional travel to London) Salary: £95,000 - £120,000 + equity + benefits - An established, global technology business within the hospitality-tech industry is seeking an accomplished Principal Software Engineer to lead the design and delivery of next-generation digital solutions. This is an opportunity to shape greenfield projects from the ground up - architecting scalable, data-driven systems that empower venues to deliver seamless guest experiences and drive long-term innovation. What will I be doing? * Lead the technical vision and architectural direction across complex backend systems, ensuring scalability, reliability, and performance. * Partner closely with engineering leadership to define best practices, coding standards, and long-term technical strategy. * Design, develop, and oversee the delivery of robust, production-grade software
        more

        Senior Software Engineer

        Fruition Group
        City of London (EC1), EC1
        £75000 - £95000 per annum
        Location: London 1x a month - Salary: £75,000 - £95,000 - An established, global technology business within the hospitality-tech industry is seeking a talented Backend Software Engineer to help build and scale cutting-edge digital solutions. This is a chance to work on greenfield projects - building new, scalable products that help venues create seamless, data-driven guest experiences from the ground up. What will I be doing? * Design, develop, test, and maintain high-performance backend systems supporting real-time hospitality operations. * Take ownership of key features throughout the software development lifecycle - from technical design through to deployment and ongoing optimisation. * Collaborate with cross-functional teams including product, design, and data science to deliver innovative, customer-focused solutions.
        Location: London 1x a month - Salary: £75,000 - £95,000 - An established, global technology business within the hospitality-tech industry is seeking a talented Backend Software Engineer to help build and scale cutting-edge digital solutions. This is a chance to work on greenfield projects - building new, scalable products that help venues create seamless, data-driven guest experiences from the ground up. What will I be doing? * Design, develop, test, and maintain high-performance backend systems supporting real-time hospitality operations. * Take ownership of key features throughout the software development lifecycle - from technical design through to deployment and ongoing optimisation. * Collaborate with cross-functional teams including product, design, and data science to deliver innovative, customer-focused solutions.
        more

        Principal Software Engineer

        Fruition Group
        City of London (EC1), EC1
        £95000 - £120000 per annum
        Location: London - 1x a month - Salary: £95,000 - £120,000 + equity + benefits - An established, global technology business within the hospitality-tech industry is seeking an accomplished Principal Software Engineer to lead the design and delivery of next-generation digital solutions. This is an opportunity to shape greenfield projects from the ground up - architecting scalable, data-driven systems that empower venues to deliver seamless guest experiences and drive long-term innovation. What will I be doing? * Lead the technical vision and architectural direction across complex backend systems, ensuring scalability, reliability, and performance. * Partner closely with engineering leadership to define best practices, coding standards, and long-term technical strategy. * Design, develop, and oversee the delivery of robust, production-grade software built using Python, D
        Location: London - 1x a month - Salary: £95,000 - £120,000 + equity + benefits - An established, global technology business within the hospitality-tech industry is seeking an accomplished Principal Software Engineer to lead the design and delivery of next-generation digital solutions. This is an opportunity to shape greenfield projects from the ground up - architecting scalable, data-driven systems that empower venues to deliver seamless guest experiences and drive long-term innovation. What will I be doing? * Lead the technical vision and architectural direction across complex backend systems, ensuring scalability, reliability, and performance. * Partner closely with engineering leadership to define best practices, coding standards, and long-term technical strategy. * Design, develop, and oversee the delivery of robust, production-grade software built using Python, D
        more
        SQL Power BI - Python - A well established and growing business based in Central London (near Waterloo) are looking for a capable, confident Data Analyst with expertise in SQL and Power BI to join them on a 6 month FTC. As the organisations sole Data Analyst, you will play a pivotal role in delivering the operational elements of the Data Strategy. Working closely with the Director of Technology and Data, you will help drive the transformation of how they use data, enhancing insight, decision-making and impact across the organisation. The primary goal is to ensure that they have the technical capabilities and structures in place, to use data from across the business to maximise efficiency. You will lead the establishment and maturity of foundational components, including data governance, quality and process validation.
        SQL Power BI - Python - A well established and growing business based in Central London (near Waterloo) are looking for a capable, confident Data Analyst with expertise in SQL and Power BI to join them on a 6 month FTC. As the organisations sole Data Analyst, you will play a pivotal role in delivering the operational elements of the Data Strategy. Working closely with the Director of Technology and Data, you will help drive the transformation of how they use data, enhancing insight, decision-making and impact across the organisation. The primary goal is to ensure that they have the technical capabilities and structures in place, to use data from across the business to maximise efficiency. You will lead the establishment and maturity of foundational components, including data governance, quality and process validation.
        more
        FEATURED
        We're looking for a highly skilled Senior Full Stack Developer with strong experience in C# .NET and React to join our growing tech team. You'll play a key role in designing, building, and maintaining robust, scalable web applications, working across the full stack to deliver high-quality solutions that drive real value. This is a hybrid role with two days a week based in the office. * Design, develop, and maintain web applications using C# .NET (Core/Framework) and React. * Collaborate with cross-functional teams to define, design, and ship new features. * Write clean, scalable, and testable code. * Troubleshoot and debug applications. * Mentor junior developers and contribute to best practices. * 5+ years of experience as a Full Stack Developer. * Strong proficiency in C# .NET (Core) and React. * Solid understanding of REST APIs, SQL/NoSQL databases, and version con
        We're looking for a highly skilled Senior Full Stack Developer with strong experience in C# .NET and React to join our growing tech team. You'll play a key role in designing, building, and maintaining robust, scalable web applications, working across the full stack to deliver high-quality solutions that drive real value. This is a hybrid role with two days a week based in the office. * Design, develop, and maintain web applications using C# .NET (Core/Framework) and React. * Collaborate with cross-functional teams to define, design, and ship new features. * Write clean, scalable, and testable code. * Troubleshoot and debug applications. * Mentor junior developers and contribute to best practices. * 5+ years of experience as a Full Stack Developer. * Strong proficiency in C# .NET (Core) and React. * Solid understanding of REST APIs, SQL/NoSQL databases, and version con
        more

        Data Analyst (Fabric)

        Oscar Associates (UK) Limited
        City of London (EC1)
        £60000 - £75000 per annum + benefits
        Job Title: BI Analyst (Fabric) Location: City of London (Hybrid 2 days a week) Salary: £60,000 - £70,000 DOE - Purpose - Reporting to the Head of Data Insight & Analytics, this role will support with the development and progression of business intelligence and insight capability. Sitting within the Data & Analytics team, this role will directly support the Private Wealth brands through building dashboards, insight tools and supporting key stakeholders, including the Private Wealth business heads, with data-driven decision making. The role would suit an experienced and driven individual who is looking for an opportunity to advance their understanding of data, working closely with business leaders to generate meaningful insight. Responsibilities * Act as the subject matter expert (SME) for data analytics and visualisation to their Private Wealth brands (Partners Wealth
        Job Title: BI Analyst (Fabric) Location: City of London (Hybrid 2 days a week) Salary: £60,000 - £70,000 DOE - Purpose - Reporting to the Head of Data Insight & Analytics, this role will support with the development and progression of business intelligence and insight capability. Sitting within the Data & Analytics team, this role will directly support the Private Wealth brands through building dashboards, insight tools and supporting key stakeholders, including the Private Wealth business heads, with data-driven decision making. The role would suit an experienced and driven individual who is looking for an opportunity to advance their understanding of data, working closely with business leaders to generate meaningful insight. Responsibilities * Act as the subject matter expert (SME) for data analytics and visualisation to their Private Wealth brands (Partners Wealth
        more
        SQL Power BI - Python - A well established and growing business based in Central London (near Waterloo) are looking for a capable, confident Data Analyst with expertise in SQL and Power BI to join them on a 6 month FTC. As the organisations sole Data Analyst, you will play a pivotal role in delivering the operational elements of the Data Strategy. Working closely with the Director of Technology and Data, you will help drive the transformation of how they use data, enhancing insight, decision-making and impact across the organisation. The primary goal is to ensure that they have the technical capabilities and structures in place, to use data from across the business to maximise efficiency. You will lead the establishment and maturity of foundational components, including data governance, quality and process validation.
        SQL Power BI - Python - A well established and growing business based in Central London (near Waterloo) are looking for a capable, confident Data Analyst with expertise in SQL and Power BI to join them on a 6 month FTC. As the organisations sole Data Analyst, you will play a pivotal role in delivering the operational elements of the Data Strategy. Working closely with the Director of Technology and Data, you will help drive the transformation of how they use data, enhancing insight, decision-making and impact across the organisation. The primary goal is to ensure that they have the technical capabilities and structures in place, to use data from across the business to maximise efficiency. You will lead the establishment and maturity of foundational components, including data governance, quality and process validation.
        more
        FEATURED
        We are seeking a highly skilled LLM Developer to design, build, and deploy a web-based AI agent that will automate and elevate our core QA coordination tasks. * Design & Implement NLP Pipelines: Parse, understand, and extract key information from unstructured Release Notes and Test Policy documents. * Develop RAG Systems: Fine-tune a Retrieval-Augmented Generation (RAG) system, training models on QA policies for accuracy and context-awareness. * Build AI Agent Architecture: Utilize modern LLM APIs (e.g., OpenAI, Anthropic, Gemini) and frameworks (e.g., LangChain, LlamaIndex) to create a robust system. * Integrate Backend APIs: Enable the AI agent to automatically publish generated test guides to our internal web platform. * Create Web-Based UI: Develop a simple, effective interface for QA teams to interact with, review, and override AI outputs if necessary.
        We are seeking a highly skilled LLM Developer to design, build, and deploy a web-based AI agent that will automate and elevate our core QA coordination tasks. * Design & Implement NLP Pipelines: Parse, understand, and extract key information from unstructured Release Notes and Test Policy documents. * Develop RAG Systems: Fine-tune a Retrieval-Augmented Generation (RAG) system, training models on QA policies for accuracy and context-awareness. * Build AI Agent Architecture: Utilize modern LLM APIs (e.g., OpenAI, Anthropic, Gemini) and frameworks (e.g., LangChain, LlamaIndex) to create a robust system. * Integrate Backend APIs: Enable the AI agent to automatically publish generated test guides to our internal web platform. * Create Web-Based UI: Develop a simple, effective interface for QA teams to interact with, review, and override AI outputs if necessary.
        more
        Technical Delivery Manager, Delivery Manager - We are working with a leading central government organisation to find a Technical Delivery Manager with a strong data delivery expertise and active SC Clearance. You will be required to lead cross functional teams to deliver a data focused technology project that supports high impact public services, ensuring outcomes are aligned with departmental strategy, governance and security standards - Rate - £650.00 per day inside ir35 - Location - London - Once a week onsite - Duration - 6 Months with the opportunity of extension - Key Responsibilities and Key Skills * Deliver end to end technical and data driven projects within a complex government environment * Manage project scopes, timelines, risks, budgets, dependencies and reporting in line with government delivery frameworks
        Technical Delivery Manager, Delivery Manager - We are working with a leading central government organisation to find a Technical Delivery Manager with a strong data delivery expertise and active SC Clearance. You will be required to lead cross functional teams to deliver a data focused technology project that supports high impact public services, ensuring outcomes are aligned with departmental strategy, governance and security standards - Rate - £650.00 per day inside ir35 - Location - London - Once a week onsite - Duration - 6 Months with the opportunity of extension - Key Responsibilities and Key Skills * Deliver end to end technical and data driven projects within a complex government environment * Manage project scopes, timelines, risks, budgets, dependencies and reporting in line with government delivery frameworks
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        FEATURED

        Principal Software Engineer

        Fruition Group
        City of London (EC1), EC1
        £95000 - £120000 per annum
        Location: Remote first (Occasional travel to London) Salary: £95,000 - £120,000 + equity + benefits - An established, global technology business within the hospitality-tech industry is seeking an accomplished Principal Software Engineer to lead the design and delivery of next-generation digital solutions. This is an opportunity to shape greenfield projects from the ground up - architecting scalable, data-driven systems that empower venues to deliver seamless guest experiences and drive long-term innovation. What will I be doing? * Lead the technical vision and architectural direction across complex backend systems, ensuring scalability, reliability, and performance. * Partner closely with engineering leadership to define best practices, coding standards, and long-term technical strategy. * Design, develop, and oversee the delivery of robust, production-grade software
        Location: Remote first (Occasional travel to London) Salary: £95,000 - £120,000 + equity + benefits - An established, global technology business within the hospitality-tech industry is seeking an accomplished Principal Software Engineer to lead the design and delivery of next-generation digital solutions. This is an opportunity to shape greenfield projects from the ground up - architecting scalable, data-driven systems that empower venues to deliver seamless guest experiences and drive long-term innovation. What will I be doing? * Lead the technical vision and architectural direction across complex backend systems, ensuring scalability, reliability, and performance. * Partner closely with engineering leadership to define best practices, coding standards, and long-term technical strategy. * Design, develop, and oversee the delivery of robust, production-grade software
        more

        Senior Software Engineer - Backend

        Fruition Group
        City of London (EC1), EC1
        £75000 - £95000 per annum
        Location: Remote first (Occasional Travel to London) Salary: £75,000 - £95,000 + equity + benefits - An established, global technology business within the hospitality-tech industry is seeking a talented Backend Software Engineer to help build and scale cutting-edge digital solutions. This is a chance to work on greenfield projects - building new, scalable products that help venues create seamless, data-driven guest experiences from the ground up. What will I be doing? * Design, develop, test, and maintain high-performance backend systems supporting real-time hospitality operations. * Take ownership of key features throughout the software development lifecycle - from technical design through to deployment and ongoing optimisation. * Collaborate with cross-functional teams including product, design, and data science to deliver innovative, customer-focused solutions.
        Location: Remote first (Occasional Travel to London) Salary: £75,000 - £95,000 + equity + benefits - An established, global technology business within the hospitality-tech industry is seeking a talented Backend Software Engineer to help build and scale cutting-edge digital solutions. This is a chance to work on greenfield projects - building new, scalable products that help venues create seamless, data-driven guest experiences from the ground up. What will I be doing? * Design, develop, test, and maintain high-performance backend systems supporting real-time hospitality operations. * Take ownership of key features throughout the software development lifecycle - from technical design through to deployment and ongoing optimisation. * Collaborate with cross-functional teams including product, design, and data science to deliver innovative, customer-focused solutions.
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        12 months - Remote - Inside IR35 - Umbrella only - As a Salesforce Developer, you will lead the development of custom solutions on the Salesforce platform. You will be responsible for writing Apex code, creating visual force pages, and implementing integrations. You will have a strong understanding of the Salesforce platform and experience leading successful projects. A Senior Salesforce Developer will have a deep understanding of the Salesforce platform and the ability to develop complex solutions, mentor and lead the development team, troubleshoot and provide technical support to clients. They will also have a solid understanding of web development concepts and languages and keep up-to-date with new Salesforce features and best practices. * Skilled in Apex, HTML, JavaScript (ES6+), CSS, SLDS, and Salesforce DX.
        12 months - Remote - Inside IR35 - Umbrella only - As a Salesforce Developer, you will lead the development of custom solutions on the Salesforce platform. You will be responsible for writing Apex code, creating visual force pages, and implementing integrations. You will have a strong understanding of the Salesforce platform and experience leading successful projects. A Senior Salesforce Developer will have a deep understanding of the Salesforce platform and the ability to develop complex solutions, mentor and lead the development team, troubleshoot and provide technical support to clients. They will also have a solid understanding of web development concepts and languages and keep up-to-date with new Salesforce features and best practices. * Skilled in Apex, HTML, JavaScript (ES6+), CSS, SLDS, and Salesforce DX.
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        FEATURED

        Graduate IT Project Manager

        Inspiring Search
        Wealdstone, Harrow (HA3), HA3 5EQ
        From £28,000 to £32,000 per annum
        We are one of the leading plumbing, heating and electrical companies nationally, serving residential and commercial clients throughout South East England with almost three decades in the industry, we have worked to build a large, fully equipped team of over 150 members of staff all focused on providing the best quality service to our customers. We work closely with various known housing associations, local councils as well as catering to the private sector such as schools, hotels, care homes and commercial building. Support the delivery and improvement of the business systems and information security. The Graduate IT Project Manager will coordinate with a third-party IT development partners, assist in implementing system enhancements, manage company IT assets, and help maintain access control and documentation processes across the business.
        We are one of the leading plumbing, heating and electrical companies nationally, serving residential and commercial clients throughout South East England with almost three decades in the industry, we have worked to build a large, fully equipped team of over 150 members of staff all focused on providing the best quality service to our customers. We work closely with various known housing associations, local councils as well as catering to the private sector such as schools, hotels, care homes and commercial building. Support the delivery and improvement of the business systems and information security. The Graduate IT Project Manager will coordinate with a third-party IT development partners, assist in implementing system enhancements, manage company IT assets, and help maintain access control and documentation processes across the business.
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        Senior Analytics Implementation Engineer

        Stepstone UK
        Southwark, South East London (SE1), SE1 0TA
        Competitive salary
        Company Description - At The Stepstone Group, we have a simple yet very important mission: The right job for everyone. Using our data, platform, and technology, we create opportunities for job seekers and companies around the world to find a perfect match, in fair and equitable way. With over 20 brands across 30+ countries, we strive for fair and unbiased hiring. Join our team of 4,000+ employees and be part of reshaping the labour market and becoming the worlds leading job-tech platform. Your benefits - Were a community here that cares as much about your life outside work as how you feel when youre with us. Because your job shouldnt take over your life, it should enrich it. * 29 days holiday allowance + bank holidays * Private medical and dental healthcare * Pension contribution up to 10% * Training and development opportunities * Cycle to work scheme * In house Bari
        Company Description - At The Stepstone Group, we have a simple yet very important mission: The right job for everyone. Using our data, platform, and technology, we create opportunities for job seekers and companies around the world to find a perfect match, in fair and equitable way. With over 20 brands across 30+ countries, we strive for fair and unbiased hiring. Join our team of 4,000+ employees and be part of reshaping the labour market and becoming the worlds leading job-tech platform. Your benefits - Were a community here that cares as much about your life outside work as how you feel when youre with us. Because your job shouldnt take over your life, it should enrich it. * 29 days holiday allowance + bank holidays * Private medical and dental healthcare * Pension contribution up to 10% * Training and development opportunities * Cycle to work scheme * In house Bari
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        PREMIUM

        DevOps Lead

        83zero Limited
        City of London (EC1)
        £80000 - £100000 per annum + Plus benefits
        Dev/Ops Lead - PaaS Platform | Hybrid (Central London) 83zero is partnered with an exciting, fast-growing startup that's making serious moves in the B2B2C social media space. They're building a next-gen Platform-as-a-Service that's already gaining traction across global media ecosystems - and they're now looking for a DevOps Lead to join their journey. This is a hands-on leadership role where you'll own the technical direction of a serverless, event-driven, globally distributed platform built on AWS. You'll lead a distributed engineering team, shape high-performance APIs, and build systems that scale hard and run clean. What's On Offer * Competitive salary + performance bonus. * Meaningful equity - build it, own it, grow with it. * Hybrid/remote-first working culture. * A seat at the decision table in a fast-scaling SaaS business.
        Dev/Ops Lead - PaaS Platform | Hybrid (Central London) 83zero is partnered with an exciting, fast-growing startup that's making serious moves in the B2B2C social media space. They're building a next-gen Platform-as-a-Service that's already gaining traction across global media ecosystems - and they're now looking for a DevOps Lead to join their journey. This is a hands-on leadership role where you'll own the technical direction of a serverless, event-driven, globally distributed platform built on AWS. You'll lead a distributed engineering team, shape high-performance APIs, and build systems that scale hard and run clean. What's On Offer * Competitive salary + performance bonus. * Meaningful equity - build it, own it, grow with it. * Hybrid/remote-first working culture. * A seat at the decision table in a fast-scaling SaaS business.
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        What is the average salary for API in Hertfordshire?

        Average salary per year
        £62,499

        The average salary for a API in Hertfordshire is £62,499. API in Hertfordshire salaries range from £47,499 to £67,499.

        Frequently Asked Questions

        How many contract API jobs are there in Hertfordshire?
        There are 171 contract API jobs within 20 miles of Hertfordshire available on CWJobs right now.

        Where in Hertfordshire are these contract jobs?
        You can find contract jobs in Stevenage, Borehamwood, Watford.

        What other similar jobs are there to contract API jobs in Hertfordshire?
        As well as contract API jobs in Hertfordshire, you can find contract Qa Automation, Quality Assurance, QA Analyst, amongst many others.