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9 Contract API jobs in East Grinstead + 20 miles
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Experience in creating front end and API automated test projects
Experience in creating front end and API automated test projects
)
Developer C#, .NET
Developer C#, .NET
Gold Group
East Grinstead (RH19)
£47500.00 - £52000.00 per annum + + benefits, Hybrid WFH
ASP.NET MVC4 / ASP.NET Core (MVC / API)
ASP.NET MVC4 / ASP.NET Core (MVC / API)
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Lead Full Stack Ruby Developer
Lead Full Stack Ruby Developer
G.R.E. Recruitment Limited
Burgess Hill (RH15)
From £80,000 to £85,000 per annum
Tech Stack: Ruby on Rails, SQL, PostgreSQL, JavaScript, Turbolinks, ReactJS, NextJS, API's, AWS - Must have an understanding of the benefits and risks of adopting AI safely and effectively
Tech Stack: Ruby on Rails, SQL, PostgreSQL, JavaScript, Turbolinks, ReactJS, NextJS, API's, AWS - Must have an understanding of the benefits and risks of adopting AI safely and effectively
)
QA Engineering Lead SaaS
QA Engineering Lead SaaS
Client Server
Underhill Park, Reigate (RH2), RH2
£100000 - £130000 per annum + bonus + benefits
You have experience with C# test automation frameworks at all levels (unit, integration, API/system)
You have experience with C# test automation frameworks at all levels (unit, integration, API/system)
PREMIUM
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Next 11 Ventures is a UK-based software incubator created to build, scale and exit high-value software businesses. We operate as an active partner, not a passive holding entity, working hand-in-hand with founders and management teams to unlock growth. Currently Next11 Ventures is seeking a Full Stack Developer to support the development of a growing portfolio of software products focused on workforce, operational and AI-enabled systems. This is an opportunity to join a small, fast-moving team working across multiple live platforms, with direct involvement in both technical delivery and product development. You will work closely with founders and stakeholders to help design, build and improve applications used within recruitment, workforce management, compliance and operational environments. Key Responsibilities * Design and develop full-stack web applications
Next 11 Ventures is a UK-based software incubator created to build, scale and exit high-value software businesses. We operate as an active partner, not a passive holding entity, working hand-in-hand with founders and management teams to unlock growth. Currently Next11 Ventures is seeking a Full Stack Developer to support the development of a growing portfolio of software products focused on workforce, operational and AI-enabled systems. This is an opportunity to join a small, fast-moving team working across multiple live platforms, with direct involvement in both technical delivery and product development. You will work closely with founders and stakeholders to help design, build and improve applications used within recruitment, workforce management, compliance and operational environments. Key Responsibilities * Design and develop full-stack web applications
Location: Horsham (Hybrid) Salary: Up to £40,000 DOE *MUST HAVE VALID RIGHT TO WORK IN UK WITHOUT EVER NEEDING SPONSORSHIP* Our client is a well-established technology business with a strong reputation for delivering innovative software and digital solutions across a diverse customer base. Due to continued growth and investment in internal systems, they are looking to appoint a Software Business Analyst to support a range of business-critical projects. This is an excellent opportunity to join a collaborative and fast-paced SME environment where you'll play a key role in bridging the gap between business operations and technical delivery teams. The Role - As a Software Business Analyst, you'll work closely with stakeholders across the business to understand requirements, improve processes, and support the successful delivery of software and systems projects.
Location: Horsham (Hybrid) Salary: Up to £40,000 DOE *MUST HAVE VALID RIGHT TO WORK IN UK WITHOUT EVER NEEDING SPONSORSHIP* Our client is a well-established technology business with a strong reputation for delivering innovative software and digital solutions across a diverse customer base. Due to continued growth and investment in internal systems, they are looking to appoint a Software Business Analyst to support a range of business-critical projects. This is an excellent opportunity to join a collaborative and fast-paced SME environment where you'll play a key role in bridging the gap between business operations and technical delivery teams. The Role - As a Software Business Analyst, you'll work closely with stakeholders across the business to understand requirements, improve processes, and support the successful delivery of software and systems projects.
)
IT & Systems Developer Administrator
IT & Systems Developer Administrator
Recruitment Helpline Ltd
Leatherhead (KT22)
From £29,000 to £32,000 per annum
Maintaining existing API integrations and investigating new ones
Maintaining existing API integrations and investigating new ones
Monitoring and optimising API development and managing calls and consumption cost
Monitoring and optimising API development and managing calls and consumption cost
Monitoring and optimising API development and managing calls and consumption cost
Monitoring and optimising API development and managing calls and consumption cost
823 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 - £130000 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
Java Developer Kafka API - Tech Consultancy
Java Developer Kafka API - Tech Consultancy
Client Server
City of London (EC2A), EC2A
£80000 - £90000 per annum
Java Developer / Backend Software Engineer (Kafka API) London / WFH to £90k
Java Developer / Backend Software Engineer (Kafka API) London / WFH to £90k
PREMIUM
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Java Engineer
Java Engineer
Profile 29
South East London (SE1)
From £40,000 to £90,000 per annum (DoE) + hybrid or remote working
Youll work across Camunda BPMN/DMN process automation, API integration, and microservice orchestration helping their public-sector clients build secure, scalable, and resilient digital services. Profile 29 recruitment keywords: Java software engineer object-oriented design OOD Camunda BPMN DMN Spring Boot REST API microservice architecture Docker Kubernetes containerisation orchestration Git CI/CD pipelines automated testing frameworks Kafka RabbitMQ Security authentication integration patterns enterprise systems agile digital transformation automation Java developer Camunda developer Zeebe Cloud AWS Azure GCP Terraform Helm process automation agentic AI artificial intelligence security clearance SC DV eDV London home based hybrid junior jnr
Youll work across Camunda BPMN/DMN process automation, API integration, and microservice orchestration helping their public-sector clients build secure, scalable, and resilient digital services. Profile 29 recruitment keywords: Java software engineer object-oriented design OOD Camunda BPMN DMN Spring Boot REST API microservice architecture Docker Kubernetes containerisation orchestration Git CI/CD pipelines automated testing frameworks Kafka RabbitMQ Security authentication integration patterns enterprise systems agile digital transformation automation Java developer Camunda developer Zeebe Cloud AWS Azure GCP Terraform Helm process automation agentic AI artificial intelligence security clearance SC DV eDV London home based hybrid junior jnr
NEW
Principle Java Engineer
Principle Java Engineer
Profile 29
South East London (SE1)
From £70,000 to £90,000 per annum + benefits + hybrid (or remote) work
Youll work across Camunda BPMN/DMN process automation, API integration, and microservice orchestration helping their public-sector clients build secure, scalable, and resilient digital services. Profile 29 recruitment keywords: Java software engineer object-oriented design OOD Camunda BPMN DMN Spring Boot REST API microservice architecture Docker Kubernetes containerisation orchestration Git CI/CD pipelines automated testing frameworks Kafka RabbitMQ Security authentication integration patterns enterprise systems agile digital transformation automation Java developer Camunda developer Zeebe Cloud AWS Azure GCP Terraform Helm process automation agentic AI artificial intelligence security clearance SC DV eDV London home based hybrid lead senior manager manage
Youll work across Camunda BPMN/DMN process automation, API integration, and microservice orchestration helping their public-sector clients build secure, scalable, and resilient digital services. Profile 29 recruitment keywords: Java software engineer object-oriented design OOD Camunda BPMN DMN Spring Boot REST API microservice architecture Docker Kubernetes containerisation orchestration Git CI/CD pipelines automated testing frameworks Kafka RabbitMQ Security authentication integration patterns enterprise systems agile digital transformation automation Java developer Camunda developer Zeebe Cloud AWS Azure GCP Terraform Helm process automation agentic AI artificial intelligence security clearance SC DV eDV London home based hybrid lead senior manager manage
Principle Java Engineer
Principle Java Engineer
Profile 29
South East London (SE1)
From £70,000 to £90,000 per annum + benefits + hybrid (or remote) work
Youll work across Camunda BPMN/DMN process automation, API integration, and microservice orchestration helping their public-sector clients build secure, scalable, and resilient digital services. Profile 29 recruitment keywords: Java software engineer object-oriented design OOD Camunda BPMN DMN Spring Boot REST API microservice architecture Docker Kubernetes containerisation orchestration Git CI/CD pipelines automated testing frameworks Kafka RabbitMQ Security authentication integration patterns enterprise systems agile digital transformation automation Java developer Camunda developer Zeebe Cloud AWS Azure GCP Terraform Helm process automation agentic AI artificial intelligence security clearance SC DV eDV London home based hybrid lead senior manager manage
Youll work across Camunda BPMN/DMN process automation, API integration, and microservice orchestration helping their public-sector clients build secure, scalable, and resilient digital services. Profile 29 recruitment keywords: Java software engineer object-oriented design OOD Camunda BPMN DMN Spring Boot REST API microservice architecture Docker Kubernetes containerisation orchestration Git CI/CD pipelines automated testing frameworks Kafka RabbitMQ Security authentication integration patterns enterprise systems agile digital transformation automation Java developer Camunda developer Zeebe Cloud AWS Azure GCP Terraform Helm process automation agentic AI artificial intelligence security clearance SC DV eDV London home based hybrid lead senior manager manage
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C# / .NET SENIOR SOFTWARE ENGINEER (AWS)
C# / .NET SENIOR SOFTWARE ENGINEER (AWS)
Secure Recruitment Ltd
East London (E1)
Up to £90,000 per annum + Benefits (Hybrid Working)
System & API Design: Strong Database Architecture Skills & Experience Designing Patterns that make Integrations Fast, Reliable & Elegant. Searches: Software Engineer / AWS / Backend Engineer /Integration Systems Architect /Data Pipeline Engineer /Senior AWS Cloud Engineer /Backend Technical Lead / Engineering Lead /Senior Software Engineer /Senior Backend Engineer /Principal Platform Engineer /Lead C# Developer / AI / API Design / API / LLMs / Artificial Intelligence
System & API Design: Strong Database Architecture Skills & Experience Designing Patterns that make Integrations Fast, Reliable & Elegant. Searches: Software Engineer / AWS / Backend Engineer /Integration Systems Architect /Data Pipeline Engineer /Senior AWS Cloud Engineer /Backend Technical Lead / Engineering Lead /Senior Software Engineer /Senior Backend Engineer /Principal Platform Engineer /Lead C# Developer / AI / API Design / API / LLMs / Artificial Intelligence
)
Software Developer - Full Stack
Software Developer - Full Stack
AWD Online
Hounslow (TW4)
From £35,000 to £40,000 per annum pro rata + Benefits
API Knowledge: Familiarity with RESTful APIs, microservices and integration patterns
API Knowledge: Familiarity with RESTful APIs, microservices and integration patterns
Solutions Engineer / FDE Python AI Hypergrowth £180k+
Solutions Engineer / FDE Python AI Hypergrowth £180k+
Transparent Technology
London
£150000 - £180000 per annum + bens, equity
FDE / Customer Engineer | London (5 Days Onsite) | Conversational AI / Enterprise SaaS | Hypergrowth AI Startup | Python, APIs, Integrations, LLMs | £150k-£180k + Equity + Benefits - A hypergrowth AI company is building enterprise-grade conversational AI agents used by some of the world's largest brands to automate and transform customer experience across voice, chat, email, and SMS. Backed by top-tier investors and scaling aggressively, they are now building a dedicated technical delivery function responsible for deploying AI agents into complex enterprise environments. This role sits at the intersection of engineering, AI workflows, and customer delivery, helping enterprise customers launch production-grade AI systems that drive measurable business impact. They are looking for technical, customer-facing engineers with experience delivering complex B2B SaaS solutions ...
FDE / Customer Engineer | London (5 Days Onsite) | Conversational AI / Enterprise SaaS | Hypergrowth AI Startup | Python, APIs, Integrations, LLMs | £150k-£180k + Equity + Benefits - A hypergrowth AI company is building enterprise-grade conversational AI agents used by some of the world's largest brands to automate and transform customer experience across voice, chat, email, and SMS. Backed by top-tier investors and scaling aggressively, they are now building a dedicated technical delivery function responsible for deploying AI agents into complex enterprise environments. This role sits at the intersection of engineering, AI workflows, and customer delivery, helping enterprise customers launch production-grade AI systems that drive measurable business impact. They are looking for technical, customer-facing engineers with experience delivering complex B2B SaaS solutions ...
)
Senior Full Stack Developer (TypeScript / Vue.js / C# / .NET) Fully Remote (UK-based) Contract Outside IR35 - Long-Term Contract - Competitive Day Rate - Were working with a well-established organisation undergoing a major platform transformation programme, and theyre looking to add an experienced Full Stack Developer to the team. This role will suit someone who enjoys owning features end-to-end, with strong frontend expertise while remaining comfortable working across APIs, databases, and backend services in a modern environment. What Youll Be Doing * Developing and enhancing customer-facing platforms and transactional systems * Building modern applications using Vue.js and TypeScript * Working closely with product, QA, and engineering teams to deliver new features * Investigating and resolving production issues across frontend, APIs, and databases
Senior Full Stack Developer (TypeScript / Vue.js / C# / .NET) Fully Remote (UK-based) Contract Outside IR35 - Long-Term Contract - Competitive Day Rate - Were working with a well-established organisation undergoing a major platform transformation programme, and theyre looking to add an experienced Full Stack Developer to the team. This role will suit someone who enjoys owning features end-to-end, with strong frontend expertise while remaining comfortable working across APIs, databases, and backend services in a modern environment. What Youll Be Doing * Developing and enhancing customer-facing platforms and transactional systems * Building modern applications using Vue.js and TypeScript * Working closely with product, QA, and engineering teams to deliver new features * Investigating and resolving production issues across frontend, APIs, and databases
FS React Native Developer - Trading London Outside IR35
FS React Native Developer - Trading London Outside IR35
Transparent Technology
London
£450 - £500 per day
Full-Stack Developer (React Native / Java) | London Hybrid | FinTech | Outside IR35 | React, React Native, Java, AWS | £450-500/day - A growing financial technology company is scaling its engineering team as it builds the next generation of modern web and mobile products for global users. With continued investment into digital platforms and infrastructure, they are looking for experienced Full-Stack Developers to support a major product and technology transformation programme. This role will focus on building scalable applications using React or React Native alongside backend services and APIs using Java. You'll work across frontend architecture, integrations, CI/CD pipelines, microservices, and cloud-native systems, helping deliver secure, high-performance products in a collaborative engineering environment. * 6+ years of full-stack engineering experience
Full-Stack Developer (React Native / Java) | London Hybrid | FinTech | Outside IR35 | React, React Native, Java, AWS | £450-500/day - A growing financial technology company is scaling its engineering team as it builds the next generation of modern web and mobile products for global users. With continued investment into digital platforms and infrastructure, they are looking for experienced Full-Stack Developers to support a major product and technology transformation programme. This role will focus on building scalable applications using React or React Native alongside backend services and APIs using Java. You'll work across frontend architecture, integrations, CI/CD pipelines, microservices, and cloud-native systems, helping deliver secure, high-performance products in a collaborative engineering environment. * 6+ years of full-stack engineering experience
)
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.
Architecture: Event-driven systems, microservices, API-first design
Architecture: Event-driven systems, microservices, API-first design
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Work closely with Digital, Data, API, and Salesforce teams to align delivery across multiple workstreams. * Experience working across Data, API, Digital, and CRM teams within complex enterprise environments.
Work closely with Digital, Data, API, and Salesforce teams to align delivery across multiple workstreams. * Experience working across Data, API, Digital, and CRM teams within complex enterprise environments.
)
Senior Specialist Solutions Architect, Communications Development Services
Senior Specialist Solutions Architect, Communications Development Services
Amazon
St James, South West London (SW1), SW1A 2DX
Competitive
Experience with email deliverability, SMS messaging, WhatsApp Business API, or push notification services-- A background working in a regulated industry such as financial services, healthcare, and public sector is a plus.
Experience with email deliverability, SMS messaging, WhatsApp Business API, or push notification services-- A background working in a regulated industry such as financial services, healthcare, and public sector is a plus.
)
Senior Technical Lead
Senior Technical Lead
Nextech Group Limited
City of London (EC1)
£85000 - £90000 per annum + Great benefits
Build foundational REST API integrations and webhook-driven automations. Build and maintain Azure middleware (Logic Apps, API Management, Service Bus) as IaC via Terraform through a CI/CD pipeline. * 5+ years hands-on API integration and platform implementation - building, not configuration support or consulting * Greenfield implementation experience with at least two of: HaloPSA, HubSpot, Sage Intacct, NinjaOne RMM, 3CX, Microsoft 365 / Graph API * REST API design - webhooks, OAuth, JSON transformation, event-driven architecture
Build foundational REST API integrations and webhook-driven automations. Build and maintain Azure middleware (Logic Apps, API Management, Service Bus) as IaC via Terraform through a CI/CD pipeline. * 5+ years hands-on API integration and platform implementation - building, not configuration support or consulting * Greenfield implementation experience with at least two of: HaloPSA, HubSpot, Sage Intacct, NinjaOne RMM, 3CX, Microsoft 365 / Graph API * REST API design - webhooks, OAuth, JSON transformation, event-driven architecture
Integration architecture: microservices, API gateways, event-driven architectures, event brokers (Kafka), queues - handling 120+ integration points across systems and legacy stacks API Development & Integration - Strong expertise in API lifecycle design usingOpenAPIspecifications (OAS) - can read and write API specs - TMF Open API
Integration architecture: microservices, API gateways, event-driven architectures, event brokers (Kafka), queues - handling 120+ integration points across systems and legacy stacks API Development & Integration - Strong expertise in API lifecycle design usingOpenAPIspecifications (OAS) - can read and write API specs - TMF Open API
Related Jobs
Locations
- Shoreditch
- St James
- The City, City (EC2)
- The City, City (EC3)
- Southwark
- Winnersh
- Boyn Hill
- Moorgate
- The City, City (EC4)
- Woollensbrook
- City of London
- South West London
- Reading
- Central London
- West End
- South East London
- East London
- Uxbridge
- West London
- North West London
- London
- Berkshire
- Hampshire
- Hertfordshire
- Surrey
- West Sussex
- East Sussex
- Essex
- Buckinghamshire
- Kent
- South East