Quality Assurance Tester

For Brazil Only, PJ contract, Fluent English Position: Senior Quality Assurance (QA) Engineer Location: Brazil (Remote) Work Hours: Must have overlap with U.S. Central Time Start Date: Immediate Contract Type: PJ (Pessoa Jurídica) Duration: 3-4 months Language Requirement: Fluent English required ( U.S.-based company) Summary We're looking for an experienced QA Engineer who ramps up quickly on complex business domains and turns that understanding into clear, risk-based test strategies. You'll combine strong manual testing skills with proven test case design and automation in .NET (C#) to raise the bar on quality across web, API, and data flows. You'll partner closely with Product, Engineering, and DevOps to deliver reliable, testable, and observable software continuously. What You'll Do Translate business processes into tests: Rapidly learn product/domain concepts and map endtoend workflows into highvalue test scenarios and acceptance criteria. Design and execute test suites: Build and maintain comprehensive manual and automated tests (UI, API, integration, regression, smoke, and exploratory). Build .NET automation: Develop and maintain C# test automation frameworks (e.G., Playwright, Selenium WebDriver, SpecFlow BDD, NUnit/xUnit/MSTest) aligned to SOLID and POM principles. Enable CI/CD quality gates: Integrate automated tests into pipelines (e.G., Azure DevOps, GitHub Actions) with parallel runs, test reporting, and flaky-test management. Collaborate across disciplines: Work with Product Owners to refine acceptance criteria, with Developers to shift-left quality, and with business users to validate in staging/preproduction environments and in production once deployed. Own defect lifecycle: Identify, document, prioritize, and drive resolution of defects with clear reproduction steps, logs, screenshots, and impact. Data & API validation: Test APIs, validate payloads and contracts (e.G., via Swagger/OpenAPI), and verify database outcomes (SQL Server). Non-functional checks: Contribute to performance baselines (e.G., k6, JMeter), and security test coordination. Test strategy & traceability: Maintain risk-based test plans, coverage maps, and traceability to requirements/ACs. Mentor & improve: Share best practices, pair on tests, and improve standards for reliability, maintainability, and observability of tests. Must Have Qualifications Software quality assurance experience, including extensive manual testing and test case design. Proficiency in building and maintaining automated tests in .NET (C#) for UI and/or API layers. Strong understanding of .NET/.NET Core, ASP.NET (MVC/Web API) fundamentals, and JSON. Hands-on with Selenium and/or Playwright, plus NUnit/xUnit/MSTest; experience. Comfortable reading application code, using Visual Studio/Visual Studio Code, debugging tests, and collaborating on testability. Experience with Azure DevOps or GitHub for source control, boards/issues, and CI/CD pipelines.