BlueALSA (bluez-alsa) is a system daemon and ALSA plugin that bridges Bluetooth audio and ALSA on Linux. It implements A2DP (source/sink), HFP/HSP, ASHA, and BLE-MIDI profiles, supporting a wide range of codecs including SBC, AAC, aptX, LDAC, LHDC, Opus, LC3plus, and more. The daemon (bluealsad) integrates with BlueZ via D-Bus, exposes PCM streams and RFCOMM endpoints over D-Bus, and provides ALSA plugins that allow any ALSA application to use Bluetooth devices as virtual sound cards. The architecture is modular: a core daemon manages Bluetooth adapters, devices, and transports; codec-specific modules implement encoder/decoder threads; a shared library provides reusable utilities (FIFO buffer, reference counting, D-Bus client, AT command parser); and ALSA plugins (PCM and control) interface with the daemon via D-Bus. The system is designed for embedded and low-power systems, with conditional compilation to reduce footprint. The codebase demonstrates strong engineering practices: extensive unit and integration tests with mock D-Bus services, CI/CD pipelines, systemd integration, and comprehensive documentation. Reusable components such as the flexible FIFO buffer, reference counting, and D-Bus client abstraction are isolated and could be extracted for other projects. However, the large optional feature matrix and heavy use of conditional compilation introduce complexity, and some codec modules show signs of boilerplate duplication.