Sebastian worked on the meshtastic/firmware repository, implementing watchdog timer support for the nRF52 platform to enhance system reliability and prevent device hangs. Using C and C++ within an embedded systems context, he integrated the watchdog initialization and feeding into the main loop, ensuring the timer could be paused during Sleep and Halt states. The watchdog was configured with a 90-second timeout to match ESP32 behavior, promoting cross-device consistency. Sebastian also updated the framework to support new watchdog features and applied code quality improvements with clang-format, demonstrating a thorough approach to maintainability and robustness in firmware development for embedded hardware.