5 of 5 Contract OpenAPI Jobs in England

Open Banking Solution Architect

Hiring Organisation
Stackstudio Digital Ltd
Location
Milton Keynes, Buckinghamshire, South East, United Kingdom
Employment Type
Contract
Contract Rate
From £550 to £600 per day
Deep understanding of OAuth 2.0, OpenID Connect, mutual TLS, certificates, token management, and consent-driven access control. Experience interpreting and applying standards such as OpenAPI, FAPI, and relevant regulatory technical standards. Architecture, Strategy, and Solution Design Significant experience operating as a Solution Architect in complex financial services environments. Proven ...

Senior Full Stack Engineer

Hiring Organisation
MarkIT Placements
Location
Didcot, Oxfordshire, South East, United Kingdom
Employment Type
Contract
Contract Rate
From £500 to £700 per day
focus) Design and evolve scalable backend services in Python using FastAPI for high-availability, high-throughput workloads. Build well-versioned RESTful APIs aligned to OpenAPI/Swagger, with strong conventions for consistency, idempotency, and backward compatibility. Implement authentication and authorization using OAuth2/OIDC, session management, and fine-grained … engineering, with a strong focus on backend development in Python and with event-driven architectures. Proven experience designing and operating production REST APIs with OpenAPI/Swagger. Comfortable working in a React/TypeScript codebase. Deep understanding of relational database design, indexing, performance tuning, and migrations (PostgreSQL). Proficiency ...

Contract) Boomi Integration Engineer

Hiring Organisation
Lynko
Location
Manchester, United Kingdom
Employment Type
Contract
strong Boomi hands-on capability). Strong knowledge of integration patterns: synchronous vs async, pub/sub, idempotency, batching, pagination. API fundamentals: REST, SOAP, OpenAPI basics, webhooks, status codes, versioning. Data formats & transformation: JSON, XML, CSV; mapping and validation; basic XSLT helpful. Operational discipline: logging, monitoring, alerting, incident response. ...

Senior Azure API Engineer

Hiring Organisation
Vermillion Analytics
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
£600 - £750/day
operationalise a lean, zero-trust API platform on Azure API Management Architect microservices and event-driven integration flows at scale Define API specifications using OpenAPI and implement modern integration patterns Drive CI/CD automation, monitoring, and operational excellence Mentor developers and champion best practices across the engineering team … that delight users What You Bring Essential: 10+ years software development, including 3+ years hands-on Azure Deep expertise in Azure API Management Strong OpenAPI, RESTful API design, and security protocols (OAuth 2.0, JWT, TLS) Proficiency in Node.js/Java/C# and modern integration patterns Experience with ...

QA Test Engineer

Hiring Organisation
Experis
Location
Northampton, Northamptonshire, United Kingdom
Employment Type
Contract
Contract Rate
£400 - £401/day
decisioning components, and integration workflows. Conduct JSON schema validation, payload structure checks, and API contract verification. Review and validate API documentation using Swagger/OpenAPI specifications. Develop Python scripts for simulation, automation, and data validation. Prepare and maintain test plans, test cases, and use cases. Validate decision strategy outputs … Agile ceremonies and support performance/monitoring activities where required. Core Skills Testing: Manual, REST API, Automation Technologies: JSON, JSON Schema, Swagger/OpenAPI Tools: Python, Karate, Excel, LoadRunner, Insomnia/Bruno CI/CD: GitLab, Jenkins Monitoring: Kibana, AppDynamics Concepts: SDLC, TDD, OAuth, Authentication/Authorization, Tokenization/ ...