The article explores the growing complexity of mobile applications and the necessity of automating end-to-end (E2E) testing to ensure compatibility and a bug-free user experience across various devices and operating systems. It introduces Appium, an open-source framework for automating UI testing for native Android and iOS applications, highlighting its cross-platform capabilities, support for multiple programming languages, and seamless integration with CI/CD tools like CircleCI. The article provides a detailed guide on setting up Appium for testing an Android application using WebDriver.io, a NodeJS client, and demonstrates integrating tests with BrowserStack for cloud-based testing and CircleCI for continuous integration. By configuring local and cloud-based testing environments, the article outlines how to automate the build and testing pipeline on CircleCI, enabling developers to build Android apps, upload APKs to BrowserStack, and run E2E tests on real devices, thereby streamlining the deployment process and enhancing test efficiency.