Alex worked on stabilizing device provisioning for the matteocrippa/firmware repository, focusing on interoperability across ESP32 variants. He addressed a bug in MAC address retrieval for ESP32C6 devices supporting IEEE 802.15.4, ensuring consistent MAC-48 format compatibility. His technical approach involved refactoring the getMacAddr function to use esp_base_mac_addr_get on newer 802.15.4-capable ESP32s, with a safe fallback to esp_efuse_mac_get_default for legacy devices. This solution, implemented in C++ and leveraging embedded systems and device driver expertise, reduced provisioning failures and improved maintainability. The work demonstrated depth in low-level hardware integration and careful handling of cross-variant compatibility challenges.