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13 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.
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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
NEW
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.
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 ...
Web Integration Analyst
Web Integration Analyst
BENEFACT GROUP PLC T/A ECCLESIASTICAL INSURANCE GROUP PLC
South Ockendon, Essex
£30,000 - £35,000 a year
Understanding of web applications, back-office systems, and third-party API integration.
Understanding of web applications, back-office systems, and third-party API integration.
Web Developer
Web Developer
BENEFACT GROUP PLC T/A ECCLESIASTICAL INSURANCE GROUP PLC
South Ockendon, Essex
£30,000 - £35,000 a year
Understanding of web applications, back-office systems, and third-party API integration.
Understanding of web applications, back-office systems, and third-party API integration.
Collaborate with internal stakeholders and external agencies to identify and map available data sources - through webhooks, API endpoints, and platform integrations - and determine how data can be used to power personalised communications.
Collaborate with internal stakeholders and external agencies to identify and map available data sources - through webhooks, API endpoints, and platform integrations - and determine how data can be used to power personalised communications.
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.
833 exact matches jobs are outside your preferred location
)
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
)
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
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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.
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Automation Engineer – Storage & Platform (Python / CI/CD / APIs)
Automation Engineer – Storage & Platform (Python / CI/CD / APIs)
Essential Consulting
South East London (SE1)
Unspecified Competitive Daily Rate - Inside IR35
Engineering API integrations between systems (REST APIs, authentication, error handling, retries, idempotency) * Hands-on experience with API integration and automation
Engineering API integrations between systems (REST APIs, authentication, error handling, retries, idempotency) * Hands-on experience with API integration and automation
)
Senior Full Stack Engineer
Senior Full Stack Engineer
RSMB
Covent Garden, Central London (WC2), WC2B
Up to £85k, based on experience
RSMB is seeking an experienced and highly capable Senior Full Stack Engineer to play a central role in the design, development, and evolution of our expanding product suite, including Barb Ads Hub, NMO XCM, and our Data Fusion platform. You will join the team based in London (Hybrid – 2 days per week in the office). Youwill join us on a full-time, permanent basis, and in return, you will receive a competitive salary of up to £85,000 per annum, based on experience. RSMB is a leading company specialising in media measurement solutions. We work with a wide range of clients delivering both long-term contracts like Barb (UK TV audience measurement) and RAJAR (Radio audience measurement), and ad hoc projects. We are proud that we have been a Barb TV audience measurement contractor since 1989 and a RAJAR contractor since 2007.
RSMB is seeking an experienced and highly capable Senior Full Stack Engineer to play a central role in the design, development, and evolution of our expanding product suite, including Barb Ads Hub, NMO XCM, and our Data Fusion platform. You will join the team based in London (Hybrid – 2 days per week in the office). Youwill join us on a full-time, permanent basis, and in return, you will receive a competitive salary of up to £85,000 per annum, based on experience. RSMB is a leading company specialising in media measurement solutions. We work with a wide range of clients delivering both long-term contracts like Barb (UK TV audience measurement) and RAJAR (Radio audience measurement), and ad hoc projects. We are proud that we have been a Barb TV audience measurement contractor since 1989 and a RAJAR contractor since 2007.
NEWPREMIUM
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.
)
Senior Product Engineer, Full Stack - Energy
Senior Product Engineer, Full Stack - Energy
MFK Recruitment Ltd
Piccadilly, Central London (W1), W1S 4NS
From £70,000 to £95,000 per annum
£70,000 to £95,000 - Permanent - London, hybrid - The opportunity - Our client is hiring a Senior Product Engineer, Full Stack, to help build the next generation of customer-facing software in the energy market. Operating in a complex, high-value sector, the business is combining technology, data, and product thinking to modernise an area of the energy industry that has historically been underserved by great software. We have already placed 3 people into the business and are pleased to be supporting them again on this important hire. This is a genuinely exciting opportunity for a frontend-strong engineer who wants real ownership, autonomy, and the chance to build products from scratch. They are looking for someone with strong React and TypeScript capability, alongside solid backend exposure across Python, APIs, and databases.
£70,000 to £95,000 - Permanent - London, hybrid - The opportunity - Our client is hiring a Senior Product Engineer, Full Stack, to help build the next generation of customer-facing software in the energy market. Operating in a complex, high-value sector, the business is combining technology, data, and product thinking to modernise an area of the energy industry that has historically been underserved by great software. We have already placed 3 people into the business and are pleased to be supporting them again on this important hire. This is a genuinely exciting opportunity for a frontend-strong engineer who wants real ownership, autonomy, and the chance to build products from scratch. They are looking for someone with strong React and TypeScript capability, alongside solid backend exposure across Python, APIs, and databases.
)
API integration's
API integration's
FEATURED
)
Senior Developer / Architect
Senior Developer / Architect
Young's Employment Services Ltd
West London (W6)
circ £75,000 - £90,000 + Bens
Azure cloud-native AKS / Container Apps, Service Bus, API Management, Blob Storage, Azure DevOps
Azure cloud-native AKS / Container Apps, Service Bus, API Management, Blob Storage, Azure DevOps
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Strong knowledge of microservices architecture and API-based integrations. * Drive security architecture including authentication, authorization, data protection, and secure API communication.
Strong knowledge of microservices architecture and API-based integrations. * Drive security architecture including authentication, authorization, data protection, and secure API communication.
)
Senior Solutions Architect
Senior Solutions Architect
The Talent Ladder
St James, South West London (SW1), SW1A
Up to £125,000 per annum Bonus and travel allowance
API design & microservices architecture
API design & microservices architecture
PREMIUM
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Locations
- The City, City (EC3)
- Piccadilly
- Shoreditch
- The City, City (EC4)
- Drybridge Hill
- Moorgate
- St James
- The City, City (EC2)
- Blackfriars
- Burnham
- City of London
- Cambridge
- Central London
- West End
- East London
- South East London
- South West London
- Loughton
- North London
- West London
- London
- Cambridgeshire
- Essex
- Surrey
- Kent
- Hertfordshire
- Berkshire
- Buckinghamshire
- Suffolk
- South East
- East Anglia