Worked on the dotnet/android-libraries repository to enhance the build environment setup process by updating and clarifying documentation. Focused on improving onboarding and build reliability, the work involved revising the BUILDING.md file using Markdown to specify the required JDK version (11) and Android SDK API level (29). Detailed instructions were added for configuring environment variables on both macOS and Windows, reducing ambiguity for new contributors. This documentation update aimed to standardize local and CI build environments, minimizing setup errors and streamlining the process for building libraries and samples. The primary technical skills demonstrated were documentation and Markdown proficiency.