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7 Contract API jobs in West Sussex + 20 miles
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API Creation and Integration
API Creation and Integration
FEATURED
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Connectivity: Design PL/SQL interfaces to handle RESTful API operations.
Connectivity: Design PL/SQL interfaces to handle RESTful API operations.
FEATURED
Build and manage secure API bridges to link platforms and allow them to share data efficiently.
Build and manage secure API bridges to link platforms and allow them to share data efficiently.
FEATURED
Location: Farnborough (3 days per week onsite) Contract Length: Initial 3-month contract - IR35 Status: Outside IR35 - Security Clearance: All candidates must be eligible for security clearance prior to appointment. We are seeking an experienced Senior Software Engineer with strong geospatial data experience to join a high-performing engineering team delivering advanced data-driven and navigation-focused solutions within a complex operational environment. This role is suited to a hands-on software engineer with experience designing and developing scalable applications and services that work with geospatial datasets, spatial databases, and mapping technologies. Experience within the maritime domain and optimisation-based problem solving would be highly beneficial. Key Responsibilities * Design, develop, and maintain scalable software applications and services
Location: Farnborough (3 days per week onsite) Contract Length: Initial 3-month contract - IR35 Status: Outside IR35 - Security Clearance: All candidates must be eligible for security clearance prior to appointment. We are seeking an experienced Senior Software Engineer with strong geospatial data experience to join a high-performing engineering team delivering advanced data-driven and navigation-focused solutions within a complex operational environment. This role is suited to a hands-on software engineer with experience designing and developing scalable applications and services that work with geospatial datasets, spatial databases, and mapping technologies. Experience within the maritime domain and optimisation-based problem solving would be highly beneficial. Key Responsibilities * Design, develop, and maintain scalable software applications and services
FEATURED
Senior Developer – Enterprise Reporting & Applications
Senior Developer – Enterprise Reporting & Applications
Subsea Craft Limited
Portsmouth, Hampshire
£55,000 - £60,000 a year
Express.js for API and service development
Express.js for API and service development
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
388 exact matches jobs are outside your preferred location
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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
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
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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.
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
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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.
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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
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API development (REST, OpenAPI)
API development (REST, OpenAPI)
FEATURED
Troubleshooters: You should be comfortable with API integrations, OAuth, and web standards.
Troubleshooters: You should be comfortable with API integrations, OAuth, and web standards.
FEATURED
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Software Programme Manager
Software Programme Manager
System Recruitment
Lymington (SO41), SO41 9AZ
£350 - £550 per day + open to negotiation
Key Skills: Software, Technical Programme Manager, Software Developer, Software Engineer, C, Linux, API, VM/Docker, OnPrem/Cloud, * API definition, consistency, suitability and validation
Key Skills: Software, Technical Programme Manager, Software Developer, Software Engineer, C, Linux, API, VM/Docker, OnPrem/Cloud, * API definition, consistency, suitability and validation
FEATURED
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Strong skills in Apex, Lightning Web Components, API integrations
Strong skills in Apex, Lightning Web Components, API integrations
FEATURED
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Understanding of enterprise solutioning with cloud platforms (AWS, Azure, GCP), API integration, and data security best practices.
Understanding of enterprise solutioning with cloud platforms (AWS, Azure, GCP), API integration, and data security best practices.
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Financial services environments commonly use messaging and integration tooling such as Kafka, RabbitMQ, MQ, or service buses, plus API standards such as OpenAPI Swagger.
Financial services environments commonly use messaging and integration tooling such as Kafka, RabbitMQ, MQ, or service buses, plus API standards such as OpenAPI Swagger.
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Monitor, troubleshoot, and optimise data processing workflows and API performance.
Monitor, troubleshoot, and optimise data processing workflows and API performance.
NEW
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The database is overwhelmingly write-driven (high-volume API request and ping logging).
The database is overwhelmingly write-driven (high-volume API request and ping logging).
Technical Troubleshooting: Experience with Chrome Developer Tools, API integrations, and investigating error codes.
Technical Troubleshooting: Experience with Chrome Developer Tools, API integrations, and investigating error codes.
FEATURED
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Oracle Technical Change Consultant - Financial Systems
Oracle Technical Change Consultant - Financial Systems
Cadence Resourcing Limited
Reading (RG1)
£550 - £600 per day + Outside IR35
The contract requires a solid understanding of database schema and API structures for core financial modules: General Ledger (GL), Accounts Payable (AP), Accounts Receivable (AR), Fixed Assets (FA), and Cash Management (CE).
The contract requires a solid understanding of database schema and API structures for core financial modules: General Ledger (GL), Accounts Payable (AP), Accounts Receivable (AR), Fixed Assets (FA), and Cash Management (CE).
FEATURED
Senior Software Developer C and Linux
Senior Software Developer C and Linux
System Recruitment
Waterford, Lymington (SO41), SO41 9AZ
£250 - £350 per day
Key Skills: Software Developer, Software Engineer, C, Linux, Autotools, LDAP, Active Directory, Terraform, OpenTofu, API
Key Skills: Software Developer, Software Engineer, C, Linux, Autotools, LDAP, Active Directory, Terraform, OpenTofu, API
FEATURED