Manually sharing mobile app builds with Quality Assurance (QA) engineers is often cumbersome and prone to errors, but this process can be streamlined using Expo EAS, CircleCI, and a custom webhook server. The approach involves triggering a build in a continuous integration (CI) environment, with a webhook server receiving notifications from EAS to download the build artifact, upload it to an AWS S3 bucket, and share a public download link via Slack. The tutorial illustrates setting up an automated pipeline using a simple Expo app with basic task-tracking features, showcasing real-world testing and automation. Key setup steps include configuring AWS S3 and Slack, establishing a local webhook server with Express, and initializing the Expo project with EAS, alongside creating a CircleCI configuration to automate tests and build processes. By the end of the tutorial, readers learn how to create a fully automated CI/CD pipeline that delivers builds to QA efficiently, eliminating manual intervention, reducing errors, and accelerating feedback cycles.