During April 2026, YumeYuka enhanced cross-platform build reliability for the uutils/coreutils and uutils/sed repositories. They reworked the stdbuf build process in coreutils, replacing build script configuration with environment variable-based platform detection to support Android targets on Windows, using Rust and build system configuration skills. In uutils/sed, YumeYuka introduced a CI workflow that validates both 32-bit and 64-bit Android builds, leveraging the Rust toolchain and Android NDK. These improvements streamlined cross-OS compilation, reduced platform-specific failures, and broadened target support, reflecting a strong grasp of Android development, CI/CD automation, and cross-platform engineering within a short timeframe.