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324 Contract API jobs in South East + 20 miles
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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
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Design and deliver event-driven, API-first, and messaging solutions (NATS, REST) * Expertise in API-first design (REST, gRPC) and microservices architecture * Proven delivery of cloud-native solutions on AWS (ECS/EKS, SQS/SNS, API Gateway) * Experience with API governance and integration best practices
Design and deliver event-driven, API-first, and messaging solutions (NATS, REST) * Expertise in API-first design (REST, gRPC) and microservices architecture * Proven delivery of cloud-native solutions on AWS (ECS/EKS, SQS/SNS, API Gateway) * Experience with API governance and integration best practices
FEATURED
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Senior C# Engineer - AI Native & Agentic Engineering, AWS, Lambda, SQS
Senior C# Engineer - AI Native & Agentic Engineering, AWS, Lambda, SQS
Smart Sourcer Limited
City of London (EC1)
From £700 to £800 per day OUTSIDE IR35
Strong authority across AWS serverless Lambda-first thinking, plus API Gateway, SQS, Step Functions, EventBridge and IAM. * Strong API design sensibility: versioning, documentation, throttling, backwards compatibility and a genuine obsession with DX.
Strong authority across AWS serverless Lambda-first thinking, plus API Gateway, SQS, Step Functions, EventBridge and IAM. * Strong API design sensibility: versioning, documentation, throttling, backwards compatibility and a genuine obsession with DX.
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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.
API design and versioning - o Governance of API lifecycle and documentation * Strong experience designing and governing API-centric architectures, including APIM, microservices, and integration patterns.
API design and versioning - o Governance of API lifecycle and documentation * Strong experience designing and governing API-centric architectures, including APIM, microservices, and integration patterns.
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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Proven track record in test automation frameworks (e.g. Jest, API/integration testing, end-to-end testing)
Proven track record in test automation frameworks (e.g. Jest, API/integration testing, end-to-end testing)
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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
API development (REST, OpenAPI)
API development (REST, OpenAPI)
FEATURED
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API Creation and Integration
API Creation and Integration
FEATURED
G.R.E. Recruitment is delighted to partner with a leading Insurance based company and support them with the hire of x3 Guidewire professionals to work on various projects. These roles are based in London on a hybrid basis (up to twice per week in the office), they are initially for 6 months with potential to extend. Preference will be given to candidates immediately available and up to 2-3 weeks notice. 1. Guidewire Technical Architect - Guidewire XCenters (ClaimCenter, PolicyCenter, BillingCenter) - 8+ yrs exp working as a Guidewire Architect 2. 3. Guidewire Lead Business Analyst - Guidewire XCenters (ClaimCenter, PolicyCenter, BillingCenter) - 6+ yrs exp working in a Guidewire XCenter BA role If you're interested in finding out more, Apply NOW!
G.R.E. Recruitment is delighted to partner with a leading Insurance based company and support them with the hire of x3 Guidewire professionals to work on various projects. These roles are based in London on a hybrid basis (up to twice per week in the office), they are initially for 6 months with potential to extend. Preference will be given to candidates immediately available and up to 2-3 weeks notice. 1. Guidewire Technical Architect - Guidewire XCenters (ClaimCenter, PolicyCenter, BillingCenter) - 8+ yrs exp working as a Guidewire Architect 2. 3. Guidewire Lead Business Analyst - Guidewire XCenters (ClaimCenter, PolicyCenter, BillingCenter) - 6+ yrs exp working in a Guidewire XCenter BA role If you're interested in finding out more, Apply NOW!
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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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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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AI Automation Engineer - SC Cleared
AI Automation Engineer - SC Cleared
VIQU IT Recruitment
City of London, London, EC2M 7PY
£300 - 400 per day + Inside IR35
Senior QA / SDET with experience across web, mobile, API, desktop, and cloud testing * Demonstrable success in large-scale automation delivery, including high-volume API automation and measurable cost optimisation * Experience across cross-platform testing (web, mobile, API, desktop) with strong functional and automation coverage
Senior QA / SDET with experience across web, mobile, API, desktop, and cloud testing * Demonstrable success in large-scale automation delivery, including high-volume API automation and measurable cost optimisation * Experience across cross-platform testing (web, mobile, API, desktop) with strong functional and automation coverage
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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
ASP.NET Web API * API-driven backend development
ASP.NET Web API * API-driven backend development
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Strong Python engineering (API design, data pipelines, cloud-native development)
Strong Python engineering (API design, data pipelines, cloud-native development)
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Python Developer - Fully Remote - 6 Month Contract Role
Python Developer - Fully Remote - 6 Month Contract Role
G.R.E. Recruitment Limited
City of London (EC1)
£450 per day
Primary skills - Python, FAST API, React & Containerization (Docker) * Experience with API development, related services, and controllers * Database connectivity modules (preferably with FAST API, SQLAlchemy, or similar
Primary skills - Python, FAST API, React & Containerization (Docker) * Experience with API development, related services, and controllers * Database connectivity modules (preferably with FAST API, SQLAlchemy, or similar
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Mainframe Middleware Infrastructure Engineer (CICS Liberty)
Mainframe Middleware Infrastructure Engineer (CICS Liberty)
Gazelle Global Consulting Ltd
London
Unspecified
REST/API enablement and modern integration practices - This is an excellent opportunity to work on critical banking and financial services infrastructure whilst helping modernise core mainframe platforms with contemporary Java and API technologies.
REST/API enablement and modern integration practices - This is an excellent opportunity to work on critical banking and financial services infrastructure whilst helping modernise core mainframe platforms with contemporary Java and API technologies.
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BMC Helix Architect / Senior Engineer
BMC Helix Architect / Senior Engineer
EUROPEAN SOFTWARE SOLUTIONS (UK) LIMITED
Andover (SP10)
£450 per day
Strong REST/SOAP API integration skills; experience with BMC Helix iPaaS / Integration Service.
Strong REST/SOAP API integration skills; experience with BMC Helix iPaaS / Integration Service.
FEATURED
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Building and maintaining API/SDK-based voice pipelines - Strong API integration skills and practical engineering mindset
Building and maintaining API/SDK-based voice pipelines - Strong API integration skills and practical engineering mindset
Execute API security testing to assess authentication, data access, and integration risks. Experience performing API and configuration reviews.
Execute API security testing to assess authentication, data access, and integration risks. Experience performing API and configuration reviews.
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IFS Security Architect Outside IR35
IFS Security Architect Outside IR35
Cathcart Technology
Watford, Hertfordshire, WD17 1EU
£600 - £650 per day
Own and evolve the IFS Cloud security architecture (roles, permission sets, data + API security)
Own and evolve the IFS Cloud security architecture (roles, permission sets, data + API security)
Own API development, database design, and infrastructure deployment via Terraform or CloudFormation. API development in Python
Own API development, database design, and infrastructure deployment via Terraform or CloudFormation. API development in Python
Related Jobs
Locations
- Broadlees
- Clerkenwell
- Grays Inn
- Maidenhead Thicket
- Moorgate
- Shipton-Under-Wychwood
- Southwark
- St James
- The City, City (EC3)
- Tower Hill
- City of London
- Central London
- Reading
- West End
- Oxford
- Farnborough
- Leatherhead
- Luton
- Maidenhead
- Milton Keynes
- London
- Berkshire
- Hampshire
- Oxfordshire
- Hertfordshire
- Bedfordshire
- Buckinghamshire
- Surrey
- Kent
- South East