Bazel is a universal build tool developed by Google, used by notable companies such as Twitter and the Android Open Source project. This tutorial guides users through building an Android project using Bazel and setting it up for continuous integration with CircleCI, concluding with automated testing and APK file production. The tutorial includes a sample project: a minimal Android app written in Kotlin with Bazel build configuration, featuring build targets for the app binary and unit tests. Prerequisites for this tutorial include experience with Android development, Kotlin, Gradle, and Git, though prior knowledge of Bazel is unnecessary. Users are instructed on setting up a project by cloning a sample from GitHub, configuring it with Bazel and Maven dependencies, and managing Android SDK and tools. It explains the structure of Bazel packages, the role of BUILD files, and the process of building and testing the project using Bazel commands. Additionally, the guide details integrating Bazel with CircleCI, including setting up the Bazel build system within CircleCI's Android Docker images, specifying Bazel versions for consistent builds, and storing build artifacts. The tutorial emphasizes the importance of using specific Bazel versions in CI/CD environments for deterministic builds and concludes with steps to run the workflow on CircleCI, encouraging further expansion of the pipeline for app deployment.