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104 Permanent API jobs in Hertfordshire + 20 miles
292 exact matches jobs are outside your preferred location
Senior Java Engineering Lead - Digital Markets Infrastructure
Senior Java Engineering Lead - Digital Markets Infrastructure
London Stock Exchange
South East
Competitive
Solid understanding of REST API design principles.
Solid understanding of REST API design principles.
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API development using technologies and standards like REST/GraphQL/gRPC or similar.
API development using technologies and standards like REST/GraphQL/gRPC or similar.
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FIEQ Product, BNY London - At BNY, our culture allows us to run our company better and enables employees growth and success. As a leading global financial services company at the heart of the global financial system, we influence nearly 20% of the worlds investible assets. Every day, our teams harness cutting-edge AI and breakthrough technologies to collaborate with clients, driving transformative solutions that redefine industries and uplift communities worldwide. Recognized as a top destination for innovators and champions of inclusion, BNY is where bold ideas meet advanced technology and exceptional talent. Together, we power the future of finance and this is what #LifeAtBNY is all about. Join us and be part of something extraordinary. The Markets business helps our clients formulate, implement and operationalize their investment strategies.
FIEQ Product, BNY London - At BNY, our culture allows us to run our company better and enables employees growth and success. As a leading global financial services company at the heart of the global financial system, we influence nearly 20% of the worlds investible assets. Every day, our teams harness cutting-edge AI and breakthrough technologies to collaborate with clients, driving transformative solutions that redefine industries and uplift communities worldwide. Recognized as a top destination for innovators and champions of inclusion, BNY is where bold ideas meet advanced technology and exceptional talent. Together, we power the future of finance and this is what #LifeAtBNY is all about. Join us and be part of something extraordinary. The Markets business helps our clients formulate, implement and operationalize their investment strategies.
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The Solutions Engineering team at Wise Platform bridges the gap between Wises technical capabilities and our partners needs, ensuring seamless API integration and optimal solution delivery. * Deep technical expertise in API-first platforms, SaaS solutions, and complex system integrations.
The Solutions Engineering team at Wise Platform bridges the gap between Wises technical capabilities and our partners needs, ensuring seamless API integration and optimal solution delivery. * Deep technical expertise in API-first platforms, SaaS solutions, and complex system integrations.
Proficiency in AWS services and serverless architecture including Lambda, API gateway, Elastic Beanstalk, EC2, S3, Aurora, Security Groups, and CloudWatch.
Proficiency in AWS services and serverless architecture including Lambda, API gateway, Elastic Beanstalk, EC2, S3, Aurora, Security Groups, and CloudWatch.
Closing date: 12/08/2025 - 37 hours / Permanent - 37,938 - 39,513 * Canolfan Rheidol, Aberystwyth *All salary values are pro-rata. Apply Online - About the role - Please note that the advertised salary for this position is subject to a pending pay award. The final salary will be adjusted in line with the nationally agreed pay award. Join Our Team as a ICT Senior Data Engineer - We are seeking a highly skilled Data Engineer to join our team. This role focuses on managing and transitioning data from traditional on-premises SQL environments to Azure cloud solutions, with a special emphasis on master data management using MS Azure SQL. The successful candidate will be key in integrating various Management Information System (MIS) databases with Azure master data repositories. Ceredigion County Council is a leading, innovative organisation that are supporting the citizens
Closing date: 12/08/2025 - 37 hours / Permanent - 37,938 - 39,513 * Canolfan Rheidol, Aberystwyth *All salary values are pro-rata. Apply Online - About the role - Please note that the advertised salary for this position is subject to a pending pay award. The final salary will be adjusted in line with the nationally agreed pay award. Join Our Team as a ICT Senior Data Engineer - We are seeking a highly skilled Data Engineer to join our team. This role focuses on managing and transitioning data from traditional on-premises SQL environments to Azure cloud solutions, with a special emphasis on master data management using MS Azure SQL. The successful candidate will be key in integrating various Management Information System (MIS) databases with Azure master data repositories. Ceredigion County Council is a leading, innovative organisation that are supporting the citizens
The Payin Platform is an internal API product. Our API product facilitates these inflows and presents a unified view of the money movement that consolidates all of these use-cases.
The Payin Platform is an internal API product. Our API product facilitates these inflows and presents a unified view of the money movement that consolidates all of these use-cases.
Technical Testing of APIs including Authentication & Authorisation, API Requests & Responses and API response codes using tools such as Postman
Technical Testing of APIs including Authentication & Authorisation, API Requests & Responses and API response codes using tools such as Postman
Previous experience working with various API Valves (including Anson, WOM, T3, Cameron) - essential
Previous experience working with various API Valves (including Anson, WOM, T3, Cameron) - essential
Investigate complex technical issues escalated from our global CX team using tools like Chrome DevTools, API logs, and internal monitoring systems.
Investigate complex technical issues escalated from our global CX team using tools like Chrome DevTools, API logs, and internal monitoring systems.
Troubleshooting and configuring Privileged applications, Privileged ID Management, and API integrations.
Troubleshooting and configuring Privileged applications, Privileged ID Management, and API integrations.
Experience contributing to the development of insurance platforms and secondary systems (BDX, MI, API).
Experience contributing to the development of insurance platforms and secondary systems (BDX, MI, API).
Software Consulting Engineer – T&D Configuration Systems & Software Solutions
Software Consulting Engineer – T&D Configuration Systems & Software Solutions
GE Vernova
UK
Competitive
Drive the integration IEC 61850 engineering workflows (SCL-based ICD, SCD, SSD) into intuitive, automated tooling ecosystems aligned with modern UI/UX, API design, and utility integration requirements. * Knowledge of data modeling, API integration, network communications, and cybersecurity practices.
Drive the integration IEC 61850 engineering workflows (SCL-based ICD, SCD, SSD) into intuitive, automated tooling ecosystems aligned with modern UI/UX, API design, and utility integration requirements. * Knowledge of data modeling, API integration, network communications, and cybersecurity practices.
Full Stack Developer .NET / Angular - Hybrid 2 -3 days based in Coleshill, Warwickshire (UK-based) | Permanent | Full-Time? Work on a global SaaS platform transforming recruitment tech - Microsoft Partner | Cutting-Edge Greenfield Projects | Agile Delivery - About Mercury - Mercury is a fast-growing SaaS business operating in close partnership with Microsoft. We specialise in delivering market-leading recruitment technology to professional staffing sectors worldwide. Our flagship product is a custom-built Applicant Tracking System (ATS) built on Microsoft Dynamics 365, tailored specifically for recruitment agencies and talent-focused businesses. With a modern tech stack and a culture of innovation, were on a mission to transform how recruitment businesses operate empowering them with scalable, intuitive software solutions. The Role
Full Stack Developer .NET / Angular - Hybrid 2 -3 days based in Coleshill, Warwickshire (UK-based) | Permanent | Full-Time? Work on a global SaaS platform transforming recruitment tech - Microsoft Partner | Cutting-Edge Greenfield Projects | Agile Delivery - About Mercury - Mercury is a fast-growing SaaS business operating in close partnership with Microsoft. We specialise in delivering market-leading recruitment technology to professional staffing sectors worldwide. Our flagship product is a custom-built Applicant Tracking System (ATS) built on Microsoft Dynamics 365, tailored specifically for recruitment agencies and talent-focused businesses. With a modern tech stack and a culture of innovation, were on a mission to transform how recruitment businesses operate empowering them with scalable, intuitive software solutions. The Role
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Hogarth - Job OverviewHogarthAdvertising United Kingdom , London, UKApply Now - Hogarth is the Global Content Experience Company. Part of WPP, Hogarth partners with one in every two of the world's top 100 brands including Coca-Cola, Ford, Rolex, Nestlé, Mondelez and Dyson. With a breadth of experience across an extensive range of sectors, Hogarth offers the unrivaled ability to deliver relevant, engaging, and measurable content across all channels and media - both established and emerging. The number of channels at our fingertips; the need for speed; and the drive for mass personalisation, all mean that brands need different solutions. Our global team of over 7,500 craft and technology experts brings together creative, production and innovation to help clients navigate this exciting and ever-changing world of today's content experience. A Hybrid working model
Hogarth - Job OverviewHogarthAdvertising United Kingdom , London, UKApply Now - Hogarth is the Global Content Experience Company. Part of WPP, Hogarth partners with one in every two of the world's top 100 brands including Coca-Cola, Ford, Rolex, Nestlé, Mondelez and Dyson. With a breadth of experience across an extensive range of sectors, Hogarth offers the unrivaled ability to deliver relevant, engaging, and measurable content across all channels and media - both established and emerging. The number of channels at our fingertips; the need for speed; and the drive for mass personalisation, all mean that brands need different solutions. Our global team of over 7,500 craft and technology experts brings together creative, production and innovation to help clients navigate this exciting and ever-changing world of today's content experience. A Hybrid working model
Strong technical skills: HTML, CSS, basic JavaScript, API integrations, Workato and troubleshooting.
Strong technical skills: HTML, CSS, basic JavaScript, API integrations, Workato and troubleshooting.
This is an exciting opportunity to contribute to the development of our cutting-edge MACH-based digital platform (Microservices, API-first, Cloud-Native, and Headless), which powers over 50 websites and Mobile Applicationsincluding some of the biggest names in retail.
This is an exciting opportunity to contribute to the development of our cutting-edge MACH-based digital platform (Microservices, API-first, Cloud-Native, and Headless), which powers over 50 websites and Mobile Applicationsincluding some of the biggest names in retail.
These platforms range from landing zones to operations tooling, providing a control plane and observability, to Kubernetes, API and integration, messaging, Experience of working with other platform engineers to auto-provision IaaS and PaaS resources, to create 3 or more of the following platforms: landing zones, Kubernetes, API and integration, messaging, data, DevSecOps tooling, contact centres (AWS Connect), CRM, ERP, data and insights, low-code, identity access and machine learning. * Good knowledge of API and integration,
These platforms range from landing zones to operations tooling, providing a control plane and observability, to Kubernetes, API and integration, messaging, Experience of working with other platform engineers to auto-provision IaaS and PaaS resources, to create 3 or more of the following platforms: landing zones, Kubernetes, API and integration, messaging, data, DevSecOps tooling, contact centres (AWS Connect), CRM, ERP, data and insights, low-code, identity access and machine learning. * Good knowledge of API and integration,
You can interact comfortably with AWS via CLI and/or API
You can interact comfortably with AWS via CLI and/or API
Our team owns the web API and other integration interfaces of MediaWiki, enabling other teams to create features that allows users to access, edit, and consume knowledge efficiently and reliably. * Contributing to the adoption and advocacy of API-first development, and influencing best practices in system design, SLOs/SLAs, and OpenAPI Specification;
Our team owns the web API and other integration interfaces of MediaWiki, enabling other teams to create features that allows users to access, edit, and consume knowledge efficiently and reliably. * Contributing to the adoption and advocacy of API-first development, and influencing best practices in system design, SLOs/SLAs, and OpenAPI Specification;
Relational databases e.g. MySQL, PostgreSQL) o RESTful API development
Relational databases e.g. MySQL, PostgreSQL) o RESTful API development
S&P GlobalInformation Services - United Kingdom , LondonApply Now - 10 - The Location: London, United Kingdom - S&P Global Ratings is looking for a highly motivated, enthusiastic and skilled senior developer to join Commercial Desktop team within Commercial Engineering, a team of technology professionals who define and execute the strategic roadmap for S&P Global Ratings Commercial team. The successful candidate will participate in the design and development of Commercial Desktop platform to help improve commercial workflows and overall productivity. The Team: Join the Rating Organization's Commercial Desktop Engineering Team, known for its expertise in commercial workflows and various technology stacks. This team values knowledge sharing, collaboration, and a unified strategy to build S&P Ratings' Commercial Desktop platform.
S&P GlobalInformation Services - United Kingdom , LondonApply Now - 10 - The Location: London, United Kingdom - S&P Global Ratings is looking for a highly motivated, enthusiastic and skilled senior developer to join Commercial Desktop team within Commercial Engineering, a team of technology professionals who define and execute the strategic roadmap for S&P Global Ratings Commercial team. The successful candidate will participate in the design and development of Commercial Desktop platform to help improve commercial workflows and overall productivity. The Team: Join the Rating Organization's Commercial Desktop Engineering Team, known for its expertise in commercial workflows and various technology stacks. This team values knowledge sharing, collaboration, and a unified strategy to build S&P Ratings' Commercial Desktop platform.
Job Introduction - Job Title: Technical Business Analyst - Salary: £51,000 - 56,000 - Contract: Permanent - Location: Hybrid based in Warrington - Weekly Hours: 35 hours per week - So. What is this role exactly? This is an exciting opportunity for a Technical Business Analyst to join our Data & Business Intelligence team. We're continuing to evolve our data capabilities and governance frameworks-so it's a great time to be part of the journey. We're looking for someone who's passionate about data, thrives on technical analysis, and takes pride in delivering high-quality solutions that support business strategy and decision-making. What will my working week look like? You will be homebased, living within the North West, within a reasonable travelling distance of our Head Office in Warrington, to attend meetings and training courses when needed.
Job Introduction - Job Title: Technical Business Analyst - Salary: £51,000 - 56,000 - Contract: Permanent - Location: Hybrid based in Warrington - Weekly Hours: 35 hours per week - So. What is this role exactly? This is an exciting opportunity for a Technical Business Analyst to join our Data & Business Intelligence team. We're continuing to evolve our data capabilities and governance frameworks-so it's a great time to be part of the journey. We're looking for someone who's passionate about data, thrives on technical analysis, and takes pride in delivering high-quality solutions that support business strategy and decision-making. What will my working week look like? You will be homebased, living within the North West, within a reasonable travelling distance of our Head Office in Warrington, to attend meetings and training courses when needed.
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Data Engineer – Proven Experience in Energy Sector, Smart Infrastructure & Industrial Automation Required
Data Engineer – Proven Experience in Energy Sector, Smart Infrastructure & Industrial Automation Required
GE Vernova
UK
Competitive
Job Description Summary - We are seeking a results-driven Data Engineer to join our Grid Innovation team. This role focuses on designing, building, and maintaining the infrastructure and data pipelines that enable effective data collection, processing, storage, and analysis for cutting-edge AI/ML applications in the energy domain. Experience in the energy sector, smart infrastructure, or industrial automation is fundamental, as this role supports AI-driven innovation in mission-critical systems with high regulatory and operational complexity. As part of the CTO organization, reporting to the AI Leader, you will work closely with Grid Automation (GA) product lines, R&D teams, product management, and other GA functions. You will also support cross-functional initiatives by developing scalable and unified data frameworks to address critical customer problems and enable r
Job Description Summary - We are seeking a results-driven Data Engineer to join our Grid Innovation team. This role focuses on designing, building, and maintaining the infrastructure and data pipelines that enable effective data collection, processing, storage, and analysis for cutting-edge AI/ML applications in the energy domain. Experience in the energy sector, smart infrastructure, or industrial automation is fundamental, as this role supports AI-driven innovation in mission-critical systems with high regulatory and operational complexity. As part of the CTO organization, reporting to the AI Leader, you will work closely with Grid Automation (GA) product lines, R&D teams, product management, and other GA functions. You will also support cross-functional initiatives by developing scalable and unified data frameworks to address critical customer problems and enable r
Fitch GroupInformation Services - United Kingdom , LondonApply Now - Fitch Group is currently seeking a Senior Software Developer Emp. Experience and Risk Technology based out of our London office. As a leading, global financial information services provider, Fitch Group delivers vital credit and risk insights, robust data, and dynamic tools to champion more efficient, transparent financial markets. With over 100 years of experience and colleagues in over 30 countries, Fitch Groups culture of credibility, independence, and transparency is embedded throughout its structure, which includes Fitch Ratings, one of the worlds top three credit ratings agencies, and Fitch Solutions, a leading provider of insights, data and analytics. With dual headquarters in London and New York, Fitch Group is owned by Hearst.
Fitch GroupInformation Services - United Kingdom , LondonApply Now - Fitch Group is currently seeking a Senior Software Developer Emp. Experience and Risk Technology based out of our London office. As a leading, global financial information services provider, Fitch Group delivers vital credit and risk insights, robust data, and dynamic tools to champion more efficient, transparent financial markets. With over 100 years of experience and colleagues in over 30 countries, Fitch Groups culture of credibility, independence, and transparency is embedded throughout its structure, which includes Fitch Ratings, one of the worlds top three credit ratings agencies, and Fitch Solutions, a leading provider of insights, data and analytics. With dual headquarters in London and New York, Fitch Group is owned by Hearst.