Date posted
Commute time
Locations
Type of Company
Job types
Salaries
Locations
Locations
Salaries
Date posted
Type of Company
Job types
Locations
- The City, City (EC2)
- The City, City (EC3)
- Piccadilly
- Shoreditch
- Charing Cross
- Drybridge Hill
- St James
- The City, City (EC4)
- Tovil
- Alconbury
- City of London
- Cambridge
- Central London
- West End
- East London
- South West London
- South East London
- Loughton
- North London
- Harlow
- London
- Cambridgeshire
- Essex
- Surrey
- Hertfordshire
- Kent
- Berkshire
- Suffolk
- Buckinghamshire
- Bedfordshire
- South East
- East Anglia
15 Permanent API jobs in Chelmsford + 20 miles
)
Full Stack Developer (FinTech/ Insurance)
Full Stack Developer (FinTech/ Insurance)
Ernest Gordon Recruitment
Basildon (SS13)
£45000 - £55000 per annum + Training, Progression, Company Benefit,
Basildon - Hybrid £45,000 - £55,000 + Training + Progression + Healthcare Coverage + Benefits - Are you a Full Stack Developer with a strong front-end focus, looking to join a talented team building cutting-edge websites for global FinTech clients, using modern technologies and receiving great training to support your progression into a senior role? Are you looking to join a company that genuinely invests in your future, with unlimited training opportunities and a best-in-class e-learning platform designed to keep you ahead of the curve in a fast-evolving tech landscape? This company have become a true disruptor in the insurance industry, seamlessly blending cutting-edge technology with every aspect of the sector. Their intelligent automation solutions are helping insurance firms stay agile, competitive, and efficient by streamlining traditionally time-consuming processes.
Basildon - Hybrid £45,000 - £55,000 + Training + Progression + Healthcare Coverage + Benefits - Are you a Full Stack Developer with a strong front-end focus, looking to join a talented team building cutting-edge websites for global FinTech clients, using modern technologies and receiving great training to support your progression into a senior role? Are you looking to join a company that genuinely invests in your future, with unlimited training opportunities and a best-in-class e-learning platform designed to keep you ahead of the curve in a fast-evolving tech landscape? This company have become a true disruptor in the insurance industry, seamlessly blending cutting-edge technology with every aspect of the sector. Their intelligent automation solutions are helping insurance firms stay agile, competitive, and efficient by streamlining traditionally time-consuming processes.
FEATURED
Knowledge of development using the Microsoft Graph API enhancing interconnectivity across applications.
Knowledge of development using the Microsoft Graph API enhancing interconnectivity across applications.
Knowledge of development using the Microsoft Graph API enhancing interconnectivity across applications.
Knowledge of development using the Microsoft Graph API enhancing interconnectivity across applications.
)
Senior Full Stack Web Developer
Senior Full Stack Web Developer
Profile 29
Loughton (IG10), IG10
From £80,000 to £100,000 per annum + benefits (see advert)
As a member of their team, you will have the opportunity to work on their public-facing API and back-office websites in a Test-Driven Agile environment.
As a member of their team, you will have the opportunity to work on their public-facing API and back-office websites in a Test-Driven Agile environment.
Software Automation QA
Software Automation QA
Profile 29
Loughton (IG10), IG10
From £50,000 to £60,000 per annum + benefits (see advert)
Conduct comprehensive testing of various API's used by affiliates and other third-party service providers
Conduct comprehensive testing of various API's used by affiliates and other third-party service providers
Software Automation QA
Software Automation QA
Profile 29
Loughton (IG10), IG10
From £50,000 to £60,000 per annum + benefits (see advert)
Conduct comprehensive testing of various API's used by affiliates and other third-party service providers
Conduct comprehensive testing of various API's used by affiliates and other third-party service providers
Senior Full Stack Web Developer
Senior Full Stack Web Developer
Profile 29
Loughton (IG10), IG10
From £80,000 to £100,000 per annum + benefits (see advert)
As a member of their team, you will have the opportunity to work on their public-facing API and back-office websites in a Test-Driven Agile environment.
As a member of their team, you will have the opportunity to work on their public-facing API and back-office websites in a Test-Driven Agile environment.
Software Automation QA
Software Automation QA
Profile 29
Loughton (IG10), IG10
From £50,000 to £60,000 per annum + benefits (see advert)
Conduct comprehensive testing of various API's used by affiliates and other third-party service providers
Conduct comprehensive testing of various API's used by affiliates and other third-party service providers
Senior Full Stack Web Developer
Senior Full Stack Web Developer
Profile 29
Loughton (IG10), IG10
From £80,000 to £100,000 per annum + benefits (see advert)
As a member of their team, you will have the opportunity to work on their public-facing API and back-office websites in a Test-Driven Agile environment.
As a member of their team, you will have the opportunity to work on their public-facing API and back-office websites in a Test-Driven Agile environment.
Our client, a prominent player in the Defence & Security sector, is currently looking for an Applications Support Engineer to join their dynamic team based in Harlow (Hybrid). This position is a Fixed Term Contract for 12 months, offering full-time hours of 37 hours per week. The successful applicant must be SC eligible. The Applications Support Engineer will become part of the wider Data and BI Product Family, initially focusing on technical deployment and application support for a major financial planning transformation. This role involves a close working relationship with programme teams and Digital Technology functions such as Architecture, Security, and Operations. Strong technical troubleshooting skills and hands-on experience with financial planning platforms are essential. * Support the initial deployment, configuration, and technical validation of the new ...
Our client, a prominent player in the Defence & Security sector, is currently looking for an Applications Support Engineer to join their dynamic team based in Harlow (Hybrid). This position is a Fixed Term Contract for 12 months, offering full-time hours of 37 hours per week. The successful applicant must be SC eligible. The Applications Support Engineer will become part of the wider Data and BI Product Family, initially focusing on technical deployment and application support for a major financial planning transformation. This role involves a close working relationship with programme teams and Digital Technology functions such as Architecture, Security, and Operations. Strong technical troubleshooting skills and hands-on experience with financial planning platforms are essential. * Support the initial deployment, configuration, and technical validation of the new ...
)
Delphi Developer
Delphi Developer
Octad Recruitment Consultants (Octad Ltd )
Wickford (SS11)
From £50,000 to £70,000 per annum Good Benefits
We are seeking an experienced Delphi / SQL Developerto join our client's growing development team and work on large-scale, business-critical enterprise applications used by global clients. This is a senior technical role focused on maintaining, enhancing, and modernising a complex Delphi-based system with a strong SQL Server backend. If you enjoy solving complex problems, working with mature codebases, and contributing to long-term system stability, this role will suit you perfectly. Key Responsibilities * Maintain, support, and enhance existing Delphi enterprise applications. * Diagnose and resolve complex defects, performance issues, and system bottlenecks. * Work closely with business users to translate requirements into technical solutions. * Produce clear documentation for updates, fixes, and new features. * Participate in sprint planning, estimation, and code reviews.
We are seeking an experienced Delphi / SQL Developerto join our client's growing development team and work on large-scale, business-critical enterprise applications used by global clients. This is a senior technical role focused on maintaining, enhancing, and modernising a complex Delphi-based system with a strong SQL Server backend. If you enjoy solving complex problems, working with mature codebases, and contributing to long-term system stability, this role will suit you perfectly. Key Responsibilities * Maintain, support, and enhance existing Delphi enterprise applications. * Diagnose and resolve complex defects, performance issues, and system bottlenecks. * Work closely with business users to translate requirements into technical solutions. * Produce clear documentation for updates, fixes, and new features. * Participate in sprint planning, estimation, and code reviews.
.NET Developer
.NET Developer
Octad Recruitment Consultants (Octad Ltd )
Wickford (SS11)
From £35,000 to £55,000 per annum Good Benefits
Were looking for a talented .NET Windows Developerto help build, modernise, and support business-critical Windows applications for this fantastic Software Consultancy. If you enjoy C#, SQL Server, system integrations, and transforming legacy code into clean, modern.NET solutions, this is a great opportunity to make a real impact. Work with:C#, .NET / .NET Core, WinForms/WPF, SQL Server, REST APIs, Azure Ideal for:Developers who love problem-solving, clean architecture, and delivering production-ready software. If youre ready to take on meaningful technical challenges in a supportive, forward-thinking team, wed love to hear from you if you have 3 years commercial experience. This role is hybrid with Monday and Wednesday in the office
Were looking for a talented .NET Windows Developerto help build, modernise, and support business-critical Windows applications for this fantastic Software Consultancy. If you enjoy C#, SQL Server, system integrations, and transforming legacy code into clean, modern.NET solutions, this is a great opportunity to make a real impact. Work with:C#, .NET / .NET Core, WinForms/WPF, SQL Server, REST APIs, Azure Ideal for:Developers who love problem-solving, clean architecture, and delivering production-ready software. If youre ready to take on meaningful technical challenges in a supportive, forward-thinking team, wed love to hear from you if you have 3 years commercial experience. This role is hybrid with Monday and Wednesday in the office
Security architecture fundamentals * API, integration, and middleware technologies
Security architecture fundamentals * API, integration, and middleware technologies
Integration technologies (API, message-based, OT interfaces, middleware)
Integration technologies (API, message-based, OT interfaces, middleware)
Application Support Engineer - 12 months' Fixed Term Contract
Application Support Engineer - 12 months' Fixed Term Contract
RTX Technologies
Harlow, London
Competitive
2026-03-10 - United Kingdom - Harlow, Essex - Hybrid - Job Title: Application Support Engineer - Grade: P3 - Function: DT - Location: Harlow (Hybrid) Clearance: SC Eligible - Duration: Fixed Term Contract 12 months - Hours: Full Time 37 hours per week - Raytheon UK - At Raytheon UK, we take immense pride in being a leader in defence and aerospace technology. As an employer, we are dedicated to fuelling innovation, nurturing talent, and fostering a culture of excellence. Joining our team means being part of an organisation that shapes the future of national security whilst investing in your growth and personal development. We provide a collaborative environment, abundant opportunities for professional development, and a profound sense of purpose in what we do. Together, we are not just advancing technology; we're building a community committed to safeguarding a safer and more connected world.
2026-03-10 - United Kingdom - Harlow, Essex - Hybrid - Job Title: Application Support Engineer - Grade: P3 - Function: DT - Location: Harlow (Hybrid) Clearance: SC Eligible - Duration: Fixed Term Contract 12 months - Hours: Full Time 37 hours per week - Raytheon UK - At Raytheon UK, we take immense pride in being a leader in defence and aerospace technology. As an employer, we are dedicated to fuelling innovation, nurturing talent, and fostering a culture of excellence. Joining our team means being part of an organisation that shapes the future of national security whilst investing in your growth and personal development. We provide a collaborative environment, abundant opportunities for professional development, and a profound sense of purpose in what we do. Together, we are not just advancing technology; we're building a community committed to safeguarding a safer and more connected world.
538 exact matches jobs are outside your preferred location
)
Technical Product Manager API SaaS
Technical Product Manager API SaaS
Client Server
Shoreditch, East London (E1), EC2A
£95000 - £120000 per annum + benefits
You'll be embedded within delivery teams, UX and engineering and utilise your knowledge of software development to make trade-offs, steward the delivery process and close the gaps in requirements including producing technical documentation along with wireframes and API scaffolding where appropriate. Apply now to find out more about this Technical Product Manager (API SaaS) opportunity.
You'll be embedded within delivery teams, UX and engineering and utilise your knowledge of software development to make trade-offs, steward the delivery process and close the gaps in requirements including producing technical documentation along with wireframes and API scaffolding where appropriate. Apply now to find out more about this Technical Product Manager (API SaaS) opportunity.
PREMIUM
C# Developer .Net SQL API
C# Developer .Net SQL API
Client Server
The City, City of London (EC4), EC4R
£75000 - £90000 per annum + benefits
C# Developer / Software Engineer (C# .Net SQL API) London onsite to £90k - There's a focus on backend and API development although you'll also have elements of front end work with JavaScript and React.js. Apply now to find out more about this C# Developer / Software Engineer (C# .Net SQL API) opportunity.
C# Developer / Software Engineer (C# .Net SQL API) London onsite to £90k - There's a focus on backend and API development although you'll also have elements of front end work with JavaScript and React.js. Apply now to find out more about this C# Developer / Software Engineer (C# .Net SQL API) opportunity.
PREMIUM
)
We are seeking a Java API Developer to join our Digital Asset development team. * Implement APIs in line with internal requirements for API design, security, versioning, and documentation, ensuring solutions are consistent and reusable. * Collaborate with business and technology stakeholders to understand requirements, clarify edge cases, and deliver well-scoped API changes in an Agile sprint model. * Hands-on experience developing Java backend applications, including REST API development in production or near-production environments. * Familiarity with common Java API frameworks and patterns (e.g., Spring Boot / Spring MVC-style services) and building maintainable service layers. * Understanding of secure API fundamentals (authentication/authorization concepts, safe handling of sensitive data) and willingness to follow enterprise standards.
We are seeking a Java API Developer to join our Digital Asset development team. * Implement APIs in line with internal requirements for API design, security, versioning, and documentation, ensuring solutions are consistent and reusable. * Collaborate with business and technology stakeholders to understand requirements, clarify edge cases, and deliver well-scoped API changes in an Agile sprint model. * Hands-on experience developing Java backend applications, including REST API development in production or near-production environments. * Familiarity with common Java API frameworks and patterns (e.g., Spring Boot / Spring MVC-style services) and building maintainable service layers. * Understanding of secure API fundamentals (authentication/authorization concepts, safe handling of sensitive data) and willingness to follow enterprise standards.
We are seeking an experienced Java API Developer to join our Digital Asset development team. This is a hands-on engineering role responsible for building and operating secure, resilient API services that power institutional digital asset capabilitiesspanning digital custody, tokenization enablement, digital transfer agency, and digital cash/settlement workflows. * Build API services that participate in the platforms centralized integration approachsupporting client/app onboarding and app-to-service integrations via an Integration Hub and secure gateways. * Implement APIs that align to enterprise API design/security/publishing requirements, ensuring designs are review-ready and compliant with internal standards (security, documentation, and platform requirements). * Collaborate across teams to drive clear API contracts and dependencies for integrations to traditional ...
We are seeking an experienced Java API Developer to join our Digital Asset development team. This is a hands-on engineering role responsible for building and operating secure, resilient API services that power institutional digital asset capabilitiesspanning digital custody, tokenization enablement, digital transfer agency, and digital cash/settlement workflows. * Build API services that participate in the platforms centralized integration approachsupporting client/app onboarding and app-to-service integrations via an Integration Hub and secure gateways. * Implement APIs that align to enterprise API design/security/publishing requirements, ensuring designs are review-ready and compliant with internal standards (security, documentation, and platform requirements). * Collaborate across teams to drive clear API contracts and dependencies for integrations to traditional ...
We are seeking an experienced Java API Developer to join our Digital Asset development team. This is a hands-on engineering role responsible for building and operating secure, resilient API services that power institutional digital asset capabilitiesspanning digital custody, tokenization enablement, digital transfer agency, and digital cash/settlement workflows. * Build API services that participate in the platforms centralized integration approachsupporting client/app onboarding and app-to-service integrations via an Integration Hub and secure gateways. * Implement APIs that align to enterprise API design/security/publishing requirements, ensuring designs are review-ready and compliant with internal standards (security, documentation, and platform requirements). * Collaborate across teams to drive clear API contracts and dependencies for integrations to traditional ...
We are seeking an experienced Java API Developer to join our Digital Asset development team. This is a hands-on engineering role responsible for building and operating secure, resilient API services that power institutional digital asset capabilitiesspanning digital custody, tokenization enablement, digital transfer agency, and digital cash/settlement workflows. * Build API services that participate in the platforms centralized integration approachsupporting client/app onboarding and app-to-service integrations via an Integration Hub and secure gateways. * Implement APIs that align to enterprise API design/security/publishing requirements, ensuring designs are review-ready and compliant with internal standards (security, documentation, and platform requirements). * Collaborate across teams to drive clear API contracts and dependencies for integrations to traditional ...
)
Understanding of security standards and protocols related to API security, such as OAuth, OpenID Connect, and JWT
Understanding of security standards and protocols related to API security, such as OAuth, OpenID Connect, and JWT
NEW
)
Workplace Platform Engineer (DocuSign & 365 & API)
Workplace Platform Engineer (DocuSign & 365 & API)
Morson Edge
City of London, London, EC1A 1AA
Market related
We are seeking a Platform Engineer to join the Modern Workplace team at a leading banking client. This team is focused on delivering a flexible, efficient, and seamless digital workplace experience, enabling colleagues to collaborate and perform effectively using enterprise tools such as Microsoft 365 and DocuSign. The successful candidate will be a key contributor to the Productivity Applications portfolio, responsible for configuring, maintaining, and enhancing platforms that support a high-performing digital workplace. Key Responsibilities * Configure, develop, and maintain solutions across the Productivity Applications platform * Contribute to the design and implementation of new digital workplace capabilities * Manage the end-to-end lifecycle of platform solutions, ensuring continuous improvement * Support business-as-usual changes and incremental enhancements
We are seeking a Platform Engineer to join the Modern Workplace team at a leading banking client. This team is focused on delivering a flexible, efficient, and seamless digital workplace experience, enabling colleagues to collaborate and perform effectively using enterprise tools such as Microsoft 365 and DocuSign. The successful candidate will be a key contributor to the Productivity Applications portfolio, responsible for configuring, maintaining, and enhancing platforms that support a high-performing digital workplace. Key Responsibilities * Configure, develop, and maintain solutions across the Productivity Applications platform * Contribute to the design and implementation of new digital workplace capabilities * Manage the end-to-end lifecycle of platform solutions, ensuring continuous improvement * Support business-as-usual changes and incremental enhancements
PREMIUM
)
Solution Architect
Solution Architect
I3 Resourcing Limited
The City, City of London (EC3), EC3V 3ND
£100000 - £120000 per annum + + bonus + benefits
Experience with API-led, microservices, and integration architectures
Experience with API-led, microservices, and integration architectures
)
This is an excellent opportunity for a senior engineer with strong scripting and API skills who wants to design intelligent solutions, streamline operations, and help create reusable automation packages that can later be rolled out to customers. * Designing and implementing automation workflows using Python, REST API integrations, Microsoft Graph API, Power Automate, JavaScript, and PowerShell. * Working on API-driven solutions and integrations with emerging technologies, including links into OpenAI and other modern automation capabilities. * Strong practical understanding of API integrations and how to connect multiple systems in a secure, stable way. * Working knowledge of Microsoft Graph API, Power Automate, JavaScript and/or PowerShell.
This is an excellent opportunity for a senior engineer with strong scripting and API skills who wants to design intelligent solutions, streamline operations, and help create reusable automation packages that can later be rolled out to customers. * Designing and implementing automation workflows using Python, REST API integrations, Microsoft Graph API, Power Automate, JavaScript, and PowerShell. * Working on API-driven solutions and integrations with emerging technologies, including links into OpenAI and other modern automation capabilities. * Strong practical understanding of API integrations and how to connect multiple systems in a secure, stable way. * Working knowledge of Microsoft Graph API, Power Automate, JavaScript and/or PowerShell.
Python AI Engineer - PropTech - London (onsite)
Python AI Engineer - PropTech - London (onsite)
Transparent Technology
London
£71000 - £130000 per annum + bens + equity
Lead Python Engineer | AI, Python, FastAPI, Django, Microservices, APIs, Cloud | London | up to £130k + Equity - Build AI-powered systems that automate real-world workflows at scale. This is an opportunity to join a fast-growing AI startup building an AI-driven platform automating up to 80% of property management workflows, transforming how compliance, maintenance, and tenant communication are handled across the UK property sector. As a Lead Python Engineer, you'll design and build scalable backend systems, APIs, and AI-driven applications, working at the intersection of software engineering, automation, and AI integration. You'll play a key role in developing systems that directly impact end users, while helping shape engineering practices and mentoring other developers in a high-growth environment.
Lead Python Engineer | AI, Python, FastAPI, Django, Microservices, APIs, Cloud | London | up to £130k + Equity - Build AI-powered systems that automate real-world workflows at scale. This is an opportunity to join a fast-growing AI startup building an AI-driven platform automating up to 80% of property management workflows, transforming how compliance, maintenance, and tenant communication are handled across the UK property sector. As a Lead Python Engineer, you'll design and build scalable backend systems, APIs, and AI-driven applications, working at the intersection of software engineering, automation, and AI integration. You'll play a key role in developing systems that directly impact end users, while helping shape engineering practices and mentoring other developers in a high-growth environment.
Related Jobs
Locations
- The City, City (EC2)
- The City, City (EC3)
- Piccadilly
- Shoreditch
- Charing Cross
- Drybridge Hill
- St James
- The City, City (EC4)
- Tovil
- Alconbury
- City of London
- Cambridge
- Central London
- West End
- East London
- South West London
- South East London
- Loughton
- North London
- Harlow
- London
- Cambridgeshire
- Essex
- Surrey
- Hertfordshire
- Kent
- Berkshire
- Suffolk
- Buckinghamshire
- Bedfordshire
- South East
- East Anglia