Role: Senior QA Tester Location: Torrance, CA- 100% Onsite Employment Type: W2 Only Work Authorization: Any- No H1B/CPT Locals highly preferred No C2C, 1099, or third-party profiles accepted. Job Description We are seeking an experienced Senior QA Tester to support testing of large-scale enterprise applications. The ideal candidate will have strong experience in Mainframe and .NET application testing, along with comprehensive knowledge of functional, integration, regression, API, database, and performance testing. Automotive industry experience is preferred but not mandatory. Required Qualifications 7+ years of experience in Software Quality Assurance and Application Testing Experience testing large-scale enterprise applications Strong Mainframe Testing experience .NET application testing experience Experience working in Agile and Hybrid delivery environments Hands-on experience with Functional Testing, SIT, UAT, and Regression Testing Experience with API, Database, and Performance Testing Strong defect lifecycle management skills SQL and database validation experience Experience with Jira and ALM/Quality Center or equivalent test management tools Familiarity with Postman, SoapUI, or similar API testing tools Responsibilities Develop and execute test scenarios, test cases, and test plans Perform functional, integration, regression, UAT, API, database, and performance testing Validate Mainframe and .NET application functionality Identify, document, track, and retest defects Perform SQL-based data validation and reconciliation Collaborate with developers, business analysts, and project stakeholders Support testing activities in Agile and Hybrid delivery environments Ensure application quality and readiness for release Preferred Qualifications Automotive industry or Automotive Services experience ISTQB, CSTE, CSQA, or equivalent QA certification Experience with AI-assisted testing tools and automation frameworks Experience supporting cloud modernization initiatives Experience with legacy system replacement programs