Senior Mainframe Operations

API Tester / QA Engineer (Java)

We are seeking a detail-oriented API Tester / QA Engineer with strong hands-on experience in API testing and Java-based automation. The role focuses on validating RESTful and GraphQL services, ensuring service reliability, correctness, and contract integrity across distributed systems.

• Perform functional, integration, and regression testing of RESTful and GraphQL APIs.
• Validate API requests and responses, payloads, headers, HTTP status codes, and error handling.
• Test API authentication, authorization, and security-related scenarios.
• Perform contract testing to ensure compatibility and compliance between services.

• Develop, execute, and maintain API automation test scripts using Java.
• Use tools such as Rest Assured for automated API validation.
• Implement mocking and service virtualization using WireMock.
• Write and maintain API collections and automated tests in Postman.
• Integrate automated tests into CI/CD pipelines where applicable.

• Review requirements, API specifications (Swagger/OpenAPI), and user stories.
• Create detailed test cases, test scenarios, and test data.
• Execute manual API tests when needed and identify edge cases.
• Log defects clearly, track resolution, and perform re-testing and regression testing.