Worked on the webdriverio/webdriverio repository to enhance end-to-end test stability by addressing issues with leftover browser windows between test runs. Using TypeScript and test automation techniques, implemented an afterEach cleanup routine that ensures each E2E test begins with a single, clean browser window. This approach involved updating teardown logic and refining window-count assertions to prevent flaky failures and cascading errors caused by residual state. The improvements led to more reliable continuous integration runs and faster feedback cycles for pull requests and releases. Focused on end-to-end testing, the work contributed to a more robust and maintainable testing environment overall.