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        See all jobs in Hertfordshire

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        209 API jobs in Hertfordshire + 20 miles

        Full Stack Engineer TypeScript API React

        Client Server
        Shoreditch, East London (E1), EC2A
        £50000 - £60000 per annum + benefits
        Full Stack Engineer / Developer (TypeScript API React) London / WFH to £60k Are you a bright, ambitious technologist who enjoys working with a range of programming languages across the full tech stack? You could progress your career at a scaling tech company that has developed a digital distribution platform transforming electronic trading in the institutional FX options market via a central marketplace where institutions can place, discover and match option interests electronically, improving liquidity and efficiency for all participants as the platform scales.
        Full Stack Engineer / Developer (TypeScript API React) London / WFH to £60k Are you a bright, ambitious technologist who enjoys working with a range of programming languages across the full tech stack? You could progress your career at a scaling tech company that has developed a digital distribution platform transforming electronic trading in the institutional FX options market via a central marketplace where institutions can place, discover and match option interests electronically, improving liquidity and efficiency for all participants as the platform scales.
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        PREMIUM

        Senior Backend Engineer TypeScript Node API

        Client Server
        The City, City of London (EC4), EC2V
        £85000 - £100000 per annum + shares + benefits
        Senior Backend Engineer / Developer (TypeScript Node API) London / WFH to £100k Are you a senior technologist looking for an opportunity to progress your career in a hands-on role where you can make an impact? You could be joining a scaling tech company that has developed a digital distribution platform transforming electronic trading in the institutional FX options market via a central marketplace where institutions can place, discover and match option interests electronically - improving liquidity and efficiency for all participants as the platform scales. As a Senior Backend Engineer you will collaborate with a small team of technologists and successful entrepreneurs to design and implement intelligent solutions to business needs, with a focus on TypeScript and Node backend systems but also with exposure to and occasional frontend work.
        Senior Backend Engineer / Developer (TypeScript Node API) London / WFH to £100k Are you a senior technologist looking for an opportunity to progress your career in a hands-on role where you can make an impact? You could be joining a scaling tech company that has developed a digital distribution platform transforming electronic trading in the institutional FX options market via a central marketplace where institutions can place, discover and match option interests electronically - improving liquidity and efficiency for all participants as the platform scales. As a Senior Backend Engineer you will collaborate with a small team of technologists and successful entrepreneurs to design and implement intelligent solutions to business needs, with a focus on TypeScript and Node backend systems but also with exposure to and occasional frontend work.
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        PREMIUM

        Head of Engineering

        RedTech Recruitment
        Milton Keynes (MK1)
        From £85,000 to £95,000 per annum
        A fantastic opportunity for a Head of Engineering / Software Development Manager to join a well established software organisation undergoing a major technical evolution. This is a senior strategic role leading engineering, QA and cloud operations through a significant SaaS migration and AI enablement programme. You will drive organisational development, technical excellence and delivery maturity while guiding the modernisation of a complex product suite used at scale across two main sectors. Location:Hybrid with minimum of 2 days a week in the Milton Keynes office, UK based Salary:£85,000 - £95,000 per annum with excellent benefits and performance bonus * Strong experience leading large engineering organisations delivering enterprise SaaS products, or transforming legacy on premise or hosted products into SaaS models
        A fantastic opportunity for a Head of Engineering / Software Development Manager to join a well established software organisation undergoing a major technical evolution. This is a senior strategic role leading engineering, QA and cloud operations through a significant SaaS migration and AI enablement programme. You will drive organisational development, technical excellence and delivery maturity while guiding the modernisation of a complex product suite used at scale across two main sectors. Location:Hybrid with minimum of 2 days a week in the Milton Keynes office, UK based Salary:£85,000 - £95,000 per annum with excellent benefits and performance bonus * Strong experience leading large engineering organisations delivering enterprise SaaS products, or transforming legacy on premise or hosted products into SaaS models
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        A fantastic opportunity has arisen for a Head of Integrations to join a pioneering software company that is transforming how global enterprises leverage cutting-edge technologies. This innovative business, backed by top-tier investors and recognised among the worlds most promising AI companies, is expanding their technical team to support continued growth and success. They are looking for an experienced technical leader to take full ownership of integrations with third-party systems. This is a hands-on, client-facing role ideal for someone who can combine deep technical knowledge with excellent communication and leadership skills to optimise client implementations. Note this is an individual contributor role leading clients opposed to team leadersership. Location:London office (3 days in office) or option to be based from the Cambridge office
        A fantastic opportunity has arisen for a Head of Integrations to join a pioneering software company that is transforming how global enterprises leverage cutting-edge technologies. This innovative business, backed by top-tier investors and recognised among the worlds most promising AI companies, is expanding their technical team to support continued growth and success. They are looking for an experienced technical leader to take full ownership of integrations with third-party systems. This is a hands-on, client-facing role ideal for someone who can combine deep technical knowledge with excellent communication and leadership skills to optimise client implementations. Note this is an individual contributor role leading clients opposed to team leadersership. Location:London office (3 days in office) or option to be based from the Cambridge office
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        A brilliant opportunity for an experienced Technical Presales professional to join a rapidly scaling AI software company who are transforming how global enterprises operate. This senior role will see you both leading and growing the pre-sales function while remaining hands-on with major strategic opportunities. Youll ensure that every engagement with prospective customers highlights the technical excellence, scalability, and enterprise readiness of their cutting-edge AI platform. Location:Central London Hybrid Salary:Competitive package with performance incentives + annual L&D budget + excellent benefits * Strong track record in presales or solutions engineering within a SaaS business, ideally with exposure to AI, cybersecurity, or enterprise-scale platforms * Proven experience building and leading high-performing technical presales or sales engineering teams
        A brilliant opportunity for an experienced Technical Presales professional to join a rapidly scaling AI software company who are transforming how global enterprises operate. This senior role will see you both leading and growing the pre-sales function while remaining hands-on with major strategic opportunities. Youll ensure that every engagement with prospective customers highlights the technical excellence, scalability, and enterprise readiness of their cutting-edge AI platform. Location:Central London Hybrid Salary:Competitive package with performance incentives + annual L&D budget + excellent benefits * Strong track record in presales or solutions engineering within a SaaS business, ideally with exposure to AI, cybersecurity, or enterprise-scale platforms * Proven experience building and leading high-performing technical presales or sales engineering teams
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        Design and buildnext generation of high-scale SaaS platforms. We're looking for a senior/lead engineering consultant with deep expertise in GraphQL to take a leading role in developing our robust TypeScript/Node.js backend. You will be instrumental in shaping our technical direction, driving the evolution of our APIs, ensuring our services are resilient, scalable and secure within a cutting-edge, cloud-native environment (Helm, Kubernetes). The Deliverables * Design and buildsophisticated, scalable GraphQL APIs and backend services using TypeScript and Node.js. * Lead the designand evolution of our API schemas, ensuring they meet the complex demands of a rapidly growing platform. * Champion best practicein code quality, automated testing (Vitest, Playwright) and observability to deliver resilient, maintainable, and production-ready business logic.
        Design and buildnext generation of high-scale SaaS platforms. We're looking for a senior/lead engineering consultant with deep expertise in GraphQL to take a leading role in developing our robust TypeScript/Node.js backend. You will be instrumental in shaping our technical direction, driving the evolution of our APIs, ensuring our services are resilient, scalable and secure within a cutting-edge, cloud-native environment (Helm, Kubernetes). The Deliverables * Design and buildsophisticated, scalable GraphQL APIs and backend services using TypeScript and Node.js. * Lead the designand evolution of our API schemas, ensuring they meet the complex demands of a rapidly growing platform. * Champion best practicein code quality, automated testing (Vitest, Playwright) and observability to deliver resilient, maintainable, and production-ready business logic.
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        Cloud Solution Architect

        International Business Solutions Consulting Limited
        Soho, Central London (W1), W1D
        £500 per day
        Cloud Platform Engineering Lead My client, a large consultancy, is in need of a Cloud Platform Engineering Lead for a 6 month contract inside IR35 based in London offering 2 days per week remote but requiring 3 days per week on-site. The ideal candidate will have strong experience in delivering large-scale, fault-tolerant systems; setting SLOs/SLIs, Terraform and modern CI/CD tools (Azure DevOps, GitHub Actions, Harness, Jenkins, Spinnaker), Containers & orchestration (Kubernetes) and service mesh (eg, Istio), API design & security (REST/OpenAPI, mTLS, authN/Z), Scripting in Bash, PowerShell, or Python, Cloud Expertise (Depth in One, Ready to Cross-Train), Azure: ARM/Bicep, AKS, Application Gateway, API Management, Azure Storage, GCP: GKE, Cloud Load Balancing, Cloud Armor, Istio, Stackdriver, Jenkins, Apigee.
        Cloud Platform Engineering Lead My client, a large consultancy, is in need of a Cloud Platform Engineering Lead for a 6 month contract inside IR35 based in London offering 2 days per week remote but requiring 3 days per week on-site. The ideal candidate will have strong experience in delivering large-scale, fault-tolerant systems; setting SLOs/SLIs, Terraform and modern CI/CD tools (Azure DevOps, GitHub Actions, Harness, Jenkins, Spinnaker), Containers & orchestration (Kubernetes) and service mesh (eg, Istio), API design & security (REST/OpenAPI, mTLS, authN/Z), Scripting in Bash, PowerShell, or Python, Cloud Expertise (Depth in One, Ready to Cross-Train), Azure: ARM/Bicep, AKS, Application Gateway, API Management, Azure Storage, GCP: GKE, Cloud Load Balancing, Cloud Armor, Istio, Stackdriver, Jenkins, Apigee.
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        Full-Stack Software Developer

        Sanderson Government and Defence
        City of London (EC1), EC1
        Up to £520 per day
        Role: Software Developer Day Rate: £520p/d Inside IR35 Location: Central London (hybrid up to 2 days a week) Clearance required: ACTIVE SC & NPPV3 clearance. Duration: initial work package until March 2026 (scope for extension as a long-term programme) We're looking for an expert Full-Stack Java Engineer to join a high-profile, fast-moving government programme with a fixed deadline. You'll work in a large team building microservices, scalable APIs, optimised SQL, and fully containerised deployments on AWS. You'll also collaborate directly with senior stakeholders, turning complex problems into tested, working solutions. What You'll Do * Build and deploy backend services with Java & Spring Boot * Develop scalable APIs * Optimise SQL for large datasets * Work with DevOps on Docker and AWS deployments * Shape architecture and technical direction
        Role: Software Developer Day Rate: £520p/d Inside IR35 Location: Central London (hybrid up to 2 days a week) Clearance required: ACTIVE SC & NPPV3 clearance. Duration: initial work package until March 2026 (scope for extension as a long-term programme) We're looking for an expert Full-Stack Java Engineer to join a high-profile, fast-moving government programme with a fixed deadline. You'll work in a large team building microservices, scalable APIs, optimised SQL, and fully containerised deployments on AWS. You'll also collaborate directly with senior stakeholders, turning complex problems into tested, working solutions. What You'll Do * Build and deploy backend services with Java & Spring Boot * Develop scalable APIs * Optimise SQL for large datasets * Work with DevOps on Docker and AWS deployments * Shape architecture and technical direction
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        FEATURED

        Tech Lead – Azure / .NET

        ARC IT Recruitment Ltd
        The City, City of London (EC4), EC4N
        Up to £100,000 per annum c.20% bonus + excellent benefits
        Remote / London (occasional office visits) £95,000 £100,000 + c.20% bonus + excellent benefits Azure | C# | .NET | APIs | Platform Leadership A senior Tech Lead is required to join a well-established e-commerce brand operating at scale, supporting high-throughput, business-critical backend systems. This role sits within a core backend and API-focused team responsible for internal platforms that directly support commercial operations. It is a leadership role first and foremost, focused on technical direction, solution design, and raising engineering standards, rather than day-to-day feature coding. Youll work closely with senior engineering leadership and a small, capable team, taking clear ownership of technical decisions while nurturing engineers and driving meaningful platform improvements.
        Remote / London (occasional office visits) £95,000 £100,000 + c.20% bonus + excellent benefits Azure | C# | .NET | APIs | Platform Leadership A senior Tech Lead is required to join a well-established e-commerce brand operating at scale, supporting high-throughput, business-critical backend systems. This role sits within a core backend and API-focused team responsible for internal platforms that directly support commercial operations. It is a leadership role first and foremost, focused on technical direction, solution design, and raising engineering standards, rather than day-to-day feature coding. Youll work closely with senior engineering leadership and a small, capable team, taking clear ownership of technical decisions while nurturing engineers and driving meaningful platform improvements.
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        Principal Engineer

        Kingston Barnes Engineering
        Keeley Green, Bedford (MK42), MK42
        £80,000 per annum holiday, pension, sick pay, life assurance
        Bedford Up to £80,000 Kingston Barnes is currently recruiting for a Principal Engineer on behalf of our client in the Bedford area. Our client is a well-known manufacturer of pumping plant for the water or wastewater industry. You will provide technical leadership, drive engineering excellent and best practice, mentor the engineering teams, and ensure the team delivers high quality equipment to their customers. Alongside this youll collaborate * Lead innovation and R&D to bring new ideas and technologies into the company. * Improve how projects are reviewed and approved * Translate customer needs into clear technical requirements for the design, testing and manufacturing teams. * Shape product strategy, working closely with sales to ensure products match market demand. * Integrate technology from the parent company into local products where beneficial.
        Bedford Up to £80,000 Kingston Barnes is currently recruiting for a Principal Engineer on behalf of our client in the Bedford area. Our client is a well-known manufacturer of pumping plant for the water or wastewater industry. You will provide technical leadership, drive engineering excellent and best practice, mentor the engineering teams, and ensure the team delivers high quality equipment to their customers. Alongside this youll collaborate * Lead innovation and R&D to bring new ideas and technologies into the company. * Improve how projects are reviewed and approved * Translate customer needs into clear technical requirements for the design, testing and manufacturing teams. * Shape product strategy, working closely with sales to ensure products match market demand. * Integrate technology from the parent company into local products where beneficial.
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        Cloud Security Engineer - Azure

        Apsley Recruitment Ltd
        City of London (EC2)
        From £500 to £550 per day
        Azure Security Engineer - Sentinel, Defender, Purview With at least five years' Azure Security experience, you will be responsible for implementing and maintaining robust security solutions across the Azure cloud infrastructure, and will have a key role in ensuring compliance, hardening environments, and leveraging Microsoft security tools to protect systems and data. Key Responsibilities * Implement and maintain secure Azure architectures in line with best practice * Develop and support cloud security policies and technical standards * Conduct security assessments, risk analysis, and contribute to security roadmaps * Collaborate with teams to integrate security into CI/CD and cloud-native applications * Configure and manage Microsoft Defender for Cloud, Defender for Endpoint, and Sentinel * Deploy Microsoft Purview for compliance and information protection
        Azure Security Engineer - Sentinel, Defender, Purview With at least five years' Azure Security experience, you will be responsible for implementing and maintaining robust security solutions across the Azure cloud infrastructure, and will have a key role in ensuring compliance, hardening environments, and leveraging Microsoft security tools to protect systems and data. Key Responsibilities * Implement and maintain secure Azure architectures in line with best practice * Develop and support cloud security policies and technical standards * Conduct security assessments, risk analysis, and contribute to security roadmaps * Collaborate with teams to integrate security into CI/CD and cloud-native applications * Configure and manage Microsoft Defender for Cloud, Defender for Endpoint, and Sentinel * Deploy Microsoft Purview for compliance and information protection
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        Description and requirements Skanska, one of the worlds leading project development and construction groups, is an inclusive and responsible business that is helping to build a better society. We are looking for a Head of Data & Analytics to join our Technology & Sustainability team in Leavesden (Watford). The Head of Data Analytics will be responsible for setting the strategic direction, governance, and delivery of data capabilities across the organisation. * Be accountable for defining and executing the organisations data and analytics strategy, aligning it with business priorities and regulatory requirements. * Lead the Data Analytics and Engineering function, ensuring seamless collaboration across Analysts, Engineers, Architects, and Governance specialists, and preparing for the future integration of Data Science.
        Description and requirements Skanska, one of the worlds leading project development and construction groups, is an inclusive and responsible business that is helping to build a better society. We are looking for a Head of Data & Analytics to join our Technology & Sustainability team in Leavesden (Watford). The Head of Data Analytics will be responsible for setting the strategic direction, governance, and delivery of data capabilities across the organisation. * Be accountable for defining and executing the organisations data and analytics strategy, aligning it with business priorities and regulatory requirements. * Lead the Data Analytics and Engineering function, ensuring seamless collaboration across Analysts, Engineers, Architects, and Governance specialists, and preparing for the future integration of Data Science.
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        NEW

        Front End Engineer

        InfinityQuest Ltd,
        Harmondsworth, West Drayton (UB7)
        Unspecified
        Required Skills & Experience * 10+ years in enterprise frontend engineering in AI/data environments. * Expertise in Tableau and/or PowerBI for rapid prototyping and stakeholder engagement * Deep hands-on experience with modern frontend frameworks (React, Typescript, etc) * Hands-on experience with cloud platforms (AWS preferred); familiarity with scalable deployment and integration * Strong knowledge of API integration. * Proven experience in developing, testing, and deploying robust frontend solutions into production environments, ensuring reliability, scalability, and maintainability beyond proof-of-concept or prototype stages. * Familiarity with airline or logistics data domains is a plus. * Significant experience in similar roles, with a proven ability to integrate quickly into new teams and deliver immediate value.
        Required Skills & Experience * 10+ years in enterprise frontend engineering in AI/data environments. * Expertise in Tableau and/or PowerBI for rapid prototyping and stakeholder engagement * Deep hands-on experience with modern frontend frameworks (React, Typescript, etc) * Hands-on experience with cloud platforms (AWS preferred); familiarity with scalable deployment and integration * Strong knowledge of API integration. * Proven experience in developing, testing, and deploying robust frontend solutions into production environments, ensuring reliability, scalability, and maintainability beyond proof-of-concept or prototype stages. * Familiarity with airline or logistics data domains is a plus. * Significant experience in similar roles, with a proven ability to integrate quickly into new teams and deliver immediate value.
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        Director of Technology Architecture and Data

        Henderson Scott
        North West London, London, NW1 7AW
        £125000 - £135000 per annum + Hybrid, 30 Days AL,
        Director of Technology Architecture & Data Strategy Location: Hybrid - London & home | 35-hour week Reports: 4 Salary: £120,000 - £135,000 Per Annum Benefits: 30 days AL, Healthcare, Family Care, Up to 10% Pension, Support Leave Overview A senior leadership role responsible for shaping the organisation's technology architecture, data strategy, and modernisation roadmap. You'll lead enterprise and solution architecture, data platforms, governance, and standards driving technical direction across cloud, integration, and data capabilities. Key Responsibilities * Define and deliver the long-term architecture & data strategy. * Lead Enterprise Architecture, Solution Architecture, and Data Management functions. * Oversee cloud architecture (primarily Microsoft Azure), integration patterns, and API frameworks.
        Director of Technology Architecture & Data Strategy Location: Hybrid - London & home | 35-hour week Reports: 4 Salary: £120,000 - £135,000 Per Annum Benefits: 30 days AL, Healthcare, Family Care, Up to 10% Pension, Support Leave Overview A senior leadership role responsible for shaping the organisation's technology architecture, data strategy, and modernisation roadmap. You'll lead enterprise and solution architecture, data platforms, governance, and standards driving technical direction across cloud, integration, and data capabilities. Key Responsibilities * Define and deliver the long-term architecture & data strategy. * Lead Enterprise Architecture, Solution Architecture, and Data Management functions. * Oversee cloud architecture (primarily Microsoft Azure), integration patterns, and API frameworks.
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        FEATURED

        Payment Architect

        Stackstudio Digital Ltd.
        Milton Keynes (MK1)
        Unspecified
        Job title- Payment Architect Location: Milton Keynes (2-3 days) Duration: 6 Months Job Description Santander UK is expanding its Payments Solution Architecture team. We are looking for senior level architects with deep experience in payments execution processing. These hires will support the modernisation of our payments estate and the migration of legacy platforms to the Payments Hub (PagoNxt). The individuals must have strong payments scheme knowledge, deep understanding of ISO 20022, and proven experience designing solutions for core payment processing. Payments domain expertise * Strong experience across payments execution processes such as orchestration, order management, clearing, settlement, reconciliations, exception handling and returns. * Practical scheme knowledge in at least several of the following: Bacs, Faster Payments, CHAPS, SWIFT, SEPA, cheques.
        Job title- Payment Architect Location: Milton Keynes (2-3 days) Duration: 6 Months Job Description Santander UK is expanding its Payments Solution Architecture team. We are looking for senior level architects with deep experience in payments execution processing. These hires will support the modernisation of our payments estate and the migration of legacy platforms to the Payments Hub (PagoNxt). The individuals must have strong payments scheme knowledge, deep understanding of ISO 20022, and proven experience designing solutions for core payment processing. Payments domain expertise * Strong experience across payments execution processes such as orchestration, order management, clearing, settlement, reconciliations, exception handling and returns. * Practical scheme knowledge in at least several of the following: Bacs, Faster Payments, CHAPS, SWIFT, SEPA, cheques.
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        Lead Product Designer

        Halian Technology Limited
        Central London (W1)
        From £100,000 to £115,000 per annum Plus bonus and benefits
        Were looking for a passionate and pragmaticProductDesign Leadto build and shape the design function of my fintech clients product within the payments space. This is a rare opportunity to define my clients design culture from the ground upspanning UI/UX, API documentation, and visual identity across the organisation. Customer-centric simplicitysits at the heart of their product philosophy. As their first in-house design leadership hire, youll have a pivotal role in making design a strategic force across the business. Youll lead by examplesetting direction, creating scalable design systems, leveraging AI tools, and contributing directly with hands-on work across product and marketing design. Key Responsibilities * Report regularly to the Product Director and keep leadership informed.
        Were looking for a passionate and pragmaticProductDesign Leadto build and shape the design function of my fintech clients product within the payments space. This is a rare opportunity to define my clients design culture from the ground upspanning UI/UX, API documentation, and visual identity across the organisation. Customer-centric simplicitysits at the heart of their product philosophy. As their first in-house design leadership hire, youll have a pivotal role in making design a strategic force across the business. Youll lead by examplesetting direction, creating scalable design systems, leveraging AI tools, and contributing directly with hands-on work across product and marketing design. Key Responsibilities * Report regularly to the Product Director and keep leadership informed.
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        A leading financial services client in London is seeking a talented AI Automation Engineer to join their team on a contract basis. Please see below for key details. Role Overview: Analyse and optimise business processes for automation whilst designing, building, and deploying intelligent automation solutions using BPA platforms (Appian), Machine Learning, and Generative AI to drive operational efficiency and innovation. 1. Process Analysis & Optimisation - Expert in analysing existing business processes through stakeholder interviews, process mapping, and workflow documentation to identify automation opportunities. Skilled in creating process flow diagrams, conducting time-motion studies, identifying bottlenecks and inefficiencies, and redesigning processes to be machine-readable and automation-ready using methodologies. 2.
        A leading financial services client in London is seeking a talented AI Automation Engineer to join their team on a contract basis. Please see below for key details. Role Overview: Analyse and optimise business processes for automation whilst designing, building, and deploying intelligent automation solutions using BPA platforms (Appian), Machine Learning, and Generative AI to drive operational efficiency and innovation. 1. Process Analysis & Optimisation - Expert in analysing existing business processes through stakeholder interviews, process mapping, and workflow documentation to identify automation opportunities. Skilled in creating process flow diagrams, conducting time-motion studies, identifying bottlenecks and inefficiencies, and redesigning processes to be machine-readable and automation-ready using methodologies. 2.
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        Business Analyst

        REC SOLUTIONS LIMITED
        The City, City of London (EC4), EC4N
        Competitive base salary plus bonus and benefits
        ***Hybrid, 3 days a week in the office 2 days remote*** An excellent opportunity has arisen for a Business Analyst to join a forward thinking, innovative exchange based in the City, London working with some cutting edge technologies. Benefits (not exhaustive list) - Business Analyst (FinTech, Financial Services, Trading, Equities, Equity) * Competitive salary * 25 days annual leave - not including bank holidays * Can opt to join Private Medical insurance scheme * Hybrid working * Flexible working hours * Company pension * Group Policies Life Assurance, Income Protection and Critical Illness * Discretionary bonus * Can opt to join Electric Car Scheme * Enhanced Maternity and Paternity Policy * Can opt to join Workplace Nursery Scheme * Length of service holiday entitlement
        ***Hybrid, 3 days a week in the office 2 days remote*** An excellent opportunity has arisen for a Business Analyst to join a forward thinking, innovative exchange based in the City, London working with some cutting edge technologies. Benefits (not exhaustive list) - Business Analyst (FinTech, Financial Services, Trading, Equities, Equity) * Competitive salary * 25 days annual leave - not including bank holidays * Can opt to join Private Medical insurance scheme * Hybrid working * Flexible working hours * Company pension * Group Policies Life Assurance, Income Protection and Critical Illness * Discretionary bonus * Can opt to join Electric Car Scheme * Enhanced Maternity and Paternity Policy * Can opt to join Workplace Nursery Scheme * Length of service holiday entitlement
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        We are seeking a dynamic scientific and technical leader to build and direct a new Discovery Applied AI/ML group a team dedicated to transforming how we discover medicines by embedding state-of-the-art AI/ML directly into our discovery workflows, platforms, and decision-making. We designed this role for someone with a desire to advance scientific knowledge and harness the revolution in AI/ML, automation, and predictive sciences to deliver measurable impacts across the drug discovery procress on the success and progression of our medicine discovery portfolio. This group will operate as the applied AI/ML engine and thought partner for GSKs Discovery functions, working in close partnership with Discovery Data Sciences and other R&D teams. * Focus on AI/ML innovation, engineering, and productization (e.g., generative design tools, active learning loops, LIAL frameworks)
        We are seeking a dynamic scientific and technical leader to build and direct a new Discovery Applied AI/ML group a team dedicated to transforming how we discover medicines by embedding state-of-the-art AI/ML directly into our discovery workflows, platforms, and decision-making. We designed this role for someone with a desire to advance scientific knowledge and harness the revolution in AI/ML, automation, and predictive sciences to deliver measurable impacts across the drug discovery procress on the success and progression of our medicine discovery portfolio. This group will operate as the applied AI/ML engine and thought partner for GSKs Discovery functions, working in close partnership with Discovery Data Sciences and other R&D teams. * Focus on AI/ML innovation, engineering, and productization (e.g., generative design tools, active learning loops, LIAL frameworks)
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        Senior Java Software Engineer (Urgent)

        Morson Edge
        Tower Hill, City of London (EC3), E1W 1WY
        £500 - 600 per day
        We are seeking an experienced Senior Java Software Engineer to join the IT team at a leading bank, supporting the delivery, maintenance, and enhancement of core systems across various business areas, including operations, compliance, transactions, and client management. This is a 6-month contract role offering an excellent day rate, ideally suited to candidates with experience in regulated environments, financial services, or government/public sector organisations. In this role, you will be an integral part of the software development lifecycle, working closely with Senior Java Developers, UI/UX teams, and Agile Transformation to architect, build, and deliver greenfield, brownfield, and integration applications.
        We are seeking an experienced Senior Java Software Engineer to join the IT team at a leading bank, supporting the delivery, maintenance, and enhancement of core systems across various business areas, including operations, compliance, transactions, and client management. This is a 6-month contract role offering an excellent day rate, ideally suited to candidates with experience in regulated environments, financial services, or government/public sector organisations. In this role, you will be an integral part of the software development lifecycle, working closely with Senior Java Developers, UI/UX teams, and Agile Transformation to architect, build, and deliver greenfield, brownfield, and integration applications.
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        Python Engineer

        Bloc Recruitment
        The City, City of London (EC4), EC2R
        £475 per day
        Up to £475 Per day inside IR35 Long term contract Remote UK/EU We’re looking for a BE Engineer to design and build high-quality backend systems and data pipelines that power the analytics platform. You’ll collaborate with engineers and the Product team across the full software lifecycle, leading on scalable services that ingest, transform and deliver data to our frontend applications and customers. You’ll bring strong Python skills, experience with microservices and data ingestion/ETL pipelines, and an eye for clean, maintainable code. Familiarity with AI-assisted dev tools (GitHub Copilot, Cursor, Windsurf, Devin) is a plus — we encourage using them to boost developer velocity and quality. What you’ll do * Design and implement robust, scalable backend services in Python * Own and improve data ingestion & processing pipelines
        Up to £475 Per day inside IR35 Long term contract Remote UK/EU We’re looking for a BE Engineer to design and build high-quality backend systems and data pipelines that power the analytics platform. You’ll collaborate with engineers and the Product team across the full software lifecycle, leading on scalable services that ingest, transform and deliver data to our frontend applications and customers. You’ll bring strong Python skills, experience with microservices and data ingestion/ETL pipelines, and an eye for clean, maintainable code. Familiarity with AI-assisted dev tools (GitHub Copilot, Cursor, Windsurf, Devin) is a plus — we encourage using them to boost developer velocity and quality. What you’ll do * Design and implement robust, scalable backend services in Python * Own and improve data ingestion & processing pipelines
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        Machine Learning Engineer

        Via Match Limited
        City of London (EC2A)
        From £70,000 to £85,000 per annum
        London, Bristol or Edinburgh We are working with a leading energy technology company that has built a major intelligence platform used by global energy and automotive brands. Their work helps accelerate the shift to reliable and affordable clean energy. The business operates internationally and promotes a flexible, hybrid approach to work. The Role The company is hiring a Machine Learning Engineer at Tech Lead level to join a central ML team supporting Product and Engineering groups. You will design and productionise ML, optimisation and GenAI solutions that sit at the core of their platform. Projects include forecasting, recommendation systems and classification tools. Key Responsibilities * Build ML and GenAI solutions in Python, using Databricks, Kafka and AWS * Deploy and maintain algorithms in a microservices environment
        London, Bristol or Edinburgh We are working with a leading energy technology company that has built a major intelligence platform used by global energy and automotive brands. Their work helps accelerate the shift to reliable and affordable clean energy. The business operates internationally and promotes a flexible, hybrid approach to work. The Role The company is hiring a Machine Learning Engineer at Tech Lead level to join a central ML team supporting Product and Engineering groups. You will design and productionise ML, optimisation and GenAI solutions that sit at the core of their platform. Projects include forecasting, recommendation systems and classification tools. Key Responsibilities * Build ML and GenAI solutions in Python, using Databricks, Kafka and AWS * Deploy and maintain algorithms in a microservices environment
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        Data Engineer

        TALENT INTERNATIONAL UK LTD
        The City, City of London (EC3), EC3M
        £490.00 per day
        1 year Contract. Remote £490 per day. Inside IR35 Our Central Government client is looking for an experienced Data Engineer to work on a brand new AI-focused Digital project in a GDS environment. Technical Responsibilities * Build and maintain data pipelines in Azure (ADF, Databricks, Key Vault). * Develop ingestion workflows for APIs, structured data, and CSV sources. * Implement Infrastructure as Code (Bicep) for Dev/Test environments. * Deliver Bronze and Silver layer transformations using Python and SQL. * Create data validation and data quality reporting processes. * Support integration across systems (IDS/Postgres, Dataverse CRM, Web App platform). * Implement secure, role-based data access controls. * Ensure code quality, scalability, and compliance with DfE technical and security standards. Delivery and Collaboration
        1 year Contract. Remote £490 per day. Inside IR35 Our Central Government client is looking for an experienced Data Engineer to work on a brand new AI-focused Digital project in a GDS environment. Technical Responsibilities * Build and maintain data pipelines in Azure (ADF, Databricks, Key Vault). * Develop ingestion workflows for APIs, structured data, and CSV sources. * Implement Infrastructure as Code (Bicep) for Dev/Test environments. * Deliver Bronze and Silver layer transformations using Python and SQL. * Create data validation and data quality reporting processes. * Support integration across systems (IDS/Postgres, Dataverse CRM, Web App platform). * Implement secure, role-based data access controls. * Ensure code quality, scalability, and compliance with DfE technical and security standards. Delivery and Collaboration
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        My London based client is looking to recruit an experienced Senior QA and Test Analyst with in depth expertise working with TOSCA. Working in the Quality Assurance and Test team this role sits within the SAP platform division and reports in to the Product & Platform QA and Test Manager. Within this lead role, you will be tasked with ensuring quality outcomes align with business strategy - focusing specifically on all SAP systems and integrated app interfaces for both Finance and HR systems automation. * Champion quality and enable successful change, engaging with all stakeholders * Ensure rapid delivery is supported through test automation, test tools and best practice * Ensure quality needs and expectations are met * Ensure stakeholders have access to quality information * Lead at all levels of the Quality lifecycle * Inform and align on Quality approach
        My London based client is looking to recruit an experienced Senior QA and Test Analyst with in depth expertise working with TOSCA. Working in the Quality Assurance and Test team this role sits within the SAP platform division and reports in to the Product & Platform QA and Test Manager. Within this lead role, you will be tasked with ensuring quality outcomes align with business strategy - focusing specifically on all SAP systems and integrated app interfaces for both Finance and HR systems automation. * Champion quality and enable successful change, engaging with all stakeholders * Ensure rapid delivery is supported through test automation, test tools and best practice * Ensure quality needs and expectations are met * Ensure stakeholders have access to quality information * Lead at all levels of the Quality lifecycle * Inform and align on Quality approach
        more
        Principal Full Stack Engineer React, Typescript, C#, .NET Core, MySQL, AWS Services (serverless) Outstanding permanent opportunity to join this global, market leading, B2B SaaS tech business as a Principal Engineer (Full Stack) / Lead Full Stack Developer with deep expertise in React, Typescript, C#, .Net Core, MySQL, AWS Serverless Services and event driven architecture. This business is embracing AI and bleeding edge development practices and offers the opportunity to help them to evolve and automate their Platform as a Service (PaaS) environment. * Own architecture and technical decisions across squads; accountable for how software is built and shipped. * Design and develop distributed, scalable microservices (C# .NET Core or Node.js) and REST/JSON APIs.
        Principal Full Stack Engineer React, Typescript, C#, .NET Core, MySQL, AWS Services (serverless) Outstanding permanent opportunity to join this global, market leading, B2B SaaS tech business as a Principal Engineer (Full Stack) / Lead Full Stack Developer with deep expertise in React, Typescript, C#, .Net Core, MySQL, AWS Serverless Services and event driven architecture. This business is embracing AI and bleeding edge development practices and offers the opportunity to help them to evolve and automate their Platform as a Service (PaaS) environment. * Own architecture and technical decisions across squads; accountable for how software is built and shipped. * Design and develop distributed, scalable microservices (C# .NET Core or Node.js) and REST/JSON APIs.
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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 API jobs are there in Hertfordshire?
        There are 209 API jobs within 20 miles of Hertfordshire available on Jobsite right now.

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

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

        How many temporary and part-time API jobs are available in Hertfordshire?
        There are 9 temporary API jobs and 15 part-time API jobs available in Hertfordshire at the moment.