Shift left testing is a strategy that emphasizes conducting software testing early in the development lifecycle to improve quality and reduce costs associated with later-stage debugging. TestRigor, an AI-powered testing tool, supports this approach by enabling user-driven test creation and rapid execution of tests without requiring programming skills, thereby allowing testers to focus on creating new test cases. TestRigor facilitates both traditional and incremental shift left testing, providing a seamless integration into CI/CD pipelines and reducing test maintenance significantly compared to tools like Selenium. By focusing on user experience and using a human perspective for test creation, testRigor helps ensure that automated tests remain stable even if underlying web frameworks change. Companies like Netflix, IDT, and Upgrade have successfully implemented testRigor, achieving higher test coverage and significant reductions in bugs and maintenance time. Overall, integrating testRigor into the development process can lead to more efficient testing practices, timely releases, and cost savings, making shift left testing an integral part of an organization's quality assurance strategy.