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10 Contract API jobs in Saunderton Lee + 20 miles
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
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QA Engineer Automation
QA Engineer Automation
Halian Technology Limited
Maidenhead Thicket, Maidenhead (SL6)
Up to £400 per day
API testing and backend validation
API testing and backend validation
ASP.NET Web API * API-driven backend development
ASP.NET Web API * API-driven backend development
The business develops and operates a suite of high-traffic digital products, including web, mobile, and API-driven services used by millions of users globally.
The business develops and operates a suite of high-traffic digital products, including web, mobile, and API-driven services used by millions of users globally.
Build and maintain test automation frameworks covering UI, API, and service-level validation * Solid API and UI automation experience (e.g. Playwright, Cypress, or similar)
Build and maintain test automation frameworks covering UI, API, and service-level validation * Solid API and UI automation experience (e.g. Playwright, Cypress, or similar)
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Full Stack .NET Web Developer
Full Stack .NET Web Developer
Association For Project Management
Saunderton Lee, Princes Risborough (HP27), HP27 9LE
From £50,000 to £55,000 per annum
Salary: £50,000- £55,000 per annum (depending on experience) 12-month Fixed Term Contract (Full time - 35 hours per week) Hybrid Working Home Based/Princes Risborough - Were Association for Project Management (APM). Were a professional membership organisation that sets the standards for the project profession. As a registered charity, we reinvest our surplus for the benefit of our members and the profession. We deliver education and develop qualifications. We conduct research and provide knowledge and resources. We run events and share best practice. We give people the opportunity to connect and provide community for our individual members and corporate partners, wherever they are. Above all, when doing so makes a difference, we challenge the status quo - Job Role Overview - An exciting opportunity has arisen for a Full Stack .NET Web Developer to join our Digital team on a fixed term ...
Salary: £50,000- £55,000 per annum (depending on experience) 12-month Fixed Term Contract (Full time - 35 hours per week) Hybrid Working Home Based/Princes Risborough - Were Association for Project Management (APM). Were a professional membership organisation that sets the standards for the project profession. As a registered charity, we reinvest our surplus for the benefit of our members and the profession. We deliver education and develop qualifications. We conduct research and provide knowledge and resources. We run events and share best practice. We give people the opportunity to connect and provide community for our individual members and corporate partners, wherever they are. Above all, when doing so makes a difference, we challenge the status quo - Job Role Overview - An exciting opportunity has arisen for a Full Stack .NET Web Developer to join our Digital team on a fixed term ...
Reading (Hybrid) What if you could own and build the AI capability from the ground up in a scaling, purpose-driven tech company? Were hiring the first dedicated AI Engineer to join a fast-growing (~280 people) Healthtech organisation making a real-world impact. This is a rare opportunity to shape the AI strategy, design production-grade systems, and bring cutting-edge LLM-powered solutions into a live product environment. The Role - Youll sit at the intersection of AI, backend engineering, and cloud systems, designing and deploying intelligent features that directly impact users. * Design and implement LLM-based applications (RAG pipelines, agents, copilots) * Build scalable backend services using Python and Java * Integrate AI into existing cloud-native SaaS platforms * Own the full lifecycle: experimentation ? prototyping ? production
Reading (Hybrid) What if you could own and build the AI capability from the ground up in a scaling, purpose-driven tech company? Were hiring the first dedicated AI Engineer to join a fast-growing (~280 people) Healthtech organisation making a real-world impact. This is a rare opportunity to shape the AI strategy, design production-grade systems, and bring cutting-edge LLM-powered solutions into a live product environment. The Role - Youll sit at the intersection of AI, backend engineering, and cloud systems, designing and deploying intelligent features that directly impact users. * Design and implement LLM-based applications (RAG pipelines, agents, copilots) * Build scalable backend services using Python and Java * Integrate AI into existing cloud-native SaaS platforms * Own the full lifecycle: experimentation ? prototyping ? production
Software Engineer
Software Engineer
Halian Technology Limited
New Town, Reading (RG1), RG1 3BE
From £55,000 to £90,000 per annum Bonus, Pension, Private Healthcare,
JOB Software Engineer - LOCATION Reading (Hybrid) TERM Permanent - SALARY £55,000 to £90,000 per annum - BENEFITS Bonus, Pension, Private Healthcare, Hybrid Working, Flexi-time, Learning & Development Budget, AI Training & Certifications etc. We are a forward-thinking technology organisation driving innovation through artificial intelligence and modern software engineering. As part of our continued growth, we are expanding our engineering team with the addition of an experienced AI Software Developer. We are looking to hire an AI Software Developer to design, build, and deploy intelligent applications and systems, leveraging modern AI frameworks and technologies from our Reading office on a hybrid basis. Strong experience in software development with a focus on AI/ML applications - A degree qualification (BSc, MSc, PhD etc.) in Computer Science, Artificial Intelligence, Software ...
JOB Software Engineer - LOCATION Reading (Hybrid) TERM Permanent - SALARY £55,000 to £90,000 per annum - BENEFITS Bonus, Pension, Private Healthcare, Hybrid Working, Flexi-time, Learning & Development Budget, AI Training & Certifications etc. We are a forward-thinking technology organisation driving innovation through artificial intelligence and modern software engineering. As part of our continued growth, we are expanding our engineering team with the addition of an experienced AI Software Developer. We are looking to hire an AI Software Developer to design, build, and deploy intelligent applications and systems, leveraging modern AI frameworks and technologies from our Reading office on a hybrid basis. Strong experience in software development with a focus on AI/ML applications - A degree qualification (BSc, MSc, PhD etc.) in Computer Science, Artificial Intelligence, Software ...
Reading (Hybrid) What if you could own and build the AI capability from the ground up in a scaling, purpose-driven tech company? Were hiring the first dedicated AI Engineer to join a fast-growing (~280 people) Healthtech organisation making a real-world impact. This is a rare opportunity to shape the AI strategy, design production-grade systems, and bring cutting-edge LLM-powered solutions into a live product environment. The Role - Youll sit at the intersection of AI, backend engineering, and cloud systems, designing and deploying intelligent features that directly impact users. * Design and implement LLM-based applications (RAG pipelines, agents, copilots) * Build scalable backend services using Python and Java * Integrate AI into existing cloud-native SaaS platforms * Own the full lifecycle: experimentation ? prototyping ? production
Reading (Hybrid) What if you could own and build the AI capability from the ground up in a scaling, purpose-driven tech company? Were hiring the first dedicated AI Engineer to join a fast-growing (~280 people) Healthtech organisation making a real-world impact. This is a rare opportunity to shape the AI strategy, design production-grade systems, and bring cutting-edge LLM-powered solutions into a live product environment. The Role - Youll sit at the intersection of AI, backend engineering, and cloud systems, designing and deploying intelligent features that directly impact users. * Design and implement LLM-based applications (RAG pipelines, agents, copilots) * Build scalable backend services using Python and Java * Integrate AI into existing cloud-native SaaS platforms * Own the full lifecycle: experimentation ? prototyping ? production
Strong C# / .NET Core / Web API experience
Strong C# / .NET Core / Web API experience
234 exact matches jobs are outside your preferred location
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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
NEWPREMIUM
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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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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
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
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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.
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Shape integration architecture across API led, event driven and microservices patterns
Shape integration architecture across API led, event driven and microservices patterns
Champion the use of strategic platforms such as ENSEK Ignition and shared integration/API frameworks.
Champion the use of strategic platforms such as ENSEK Ignition and shared integration/API frameworks.
PREMIUM
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The Microsoft Entra ID Architect is responsible for defining the target state architecture for enterprise identity using Microsoft Entra ID, with a strong focus on Identity Governance, Secure Access, and API driven provisioning. Design API first provisioning patterns using - Microsoft Graph API Proven architecture experience with Graph API, SCIM, Lifecycle Workflows.
The Microsoft Entra ID Architect is responsible for defining the target state architecture for enterprise identity using Microsoft Entra ID, with a strong focus on Identity Governance, Secure Access, and API driven provisioning. Design API first provisioning patterns using - Microsoft Graph API Proven architecture experience with Graph API, SCIM, Lifecycle Workflows.
Hands on design and architecture experience with SAP technologies such as : S/4HANA Finance, SAP FICO (FI/CO), SAP CFIN, Enterprise integrations and API, SAP MDG - Finance master data management and exposure to non-SAP technologies such as Blackline etc.
Hands on design and architecture experience with SAP technologies such as : S/4HANA Finance, SAP FICO (FI/CO), SAP CFIN, Enterprise integrations and API, SAP MDG - Finance master data management and exposure to non-SAP technologies such as Blackline etc.
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API-first, event-driven, and real-time data architectures - o API and integration architectures
API-first, event-driven, and real-time data architectures - o API and integration architectures
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Strong technical expertise across Marketing Cloud including SQL, AMPscript, SSJS, Automation Studio and API integrations
Strong technical expertise across Marketing Cloud including SQL, AMPscript, SSJS, Automation Studio and API integrations
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Play a significant role in the design and development of our full system with embedded HSMs, client-side tools & API libraries. * Familiarity with full-stack from device drivers, to client-side tools & API libraries. (Some knowledge of hardware protocols.)
Play a significant role in the design and development of our full system with embedded HSMs, client-side tools & API libraries. * Familiarity with full-stack from device drivers, to client-side tools & API libraries. (Some knowledge of hardware protocols.)
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Experience with Redux, MobX, Zustand, or Context API.
Experience with Redux, MobX, Zustand, or Context API.
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Connectivity: Design PL/SQL interfaces to handle RESTful API operations.
Connectivity: Design PL/SQL interfaces to handle RESTful API operations.
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Related Jobs
Locations
- Shoreditch
- St James
- The City, City (EC3)
- Winnersh
- Fenny Lock
- Lower Heyford
- Maidenhead Thicket
- Moorgate
- New Town
- Saunderton Lee
- City of London
- Cambridge
- Reading
- Central London
- West End
- East London
- Farnborough
- Milton Keynes
- South West London
- Uxbridge
- London
- Berkshire
- Cambridgeshire
- Buckinghamshire
- Hertfordshire
- Hampshire
- Oxfordshire
- Northamptonshire
- Bedfordshire
- Gloucestershire
- South East
- East Anglia
- Midlands
- East Midlands
- South West
- West Midlands