Worked on reliability, performance, and maintainability improvements across the apache/nuttx and apache/nuttx-apps repositories, focusing on embedded systems and ARM architecture. Delivered three features and resolved one bug by refining watchdog and protocol driver logic on the sim board, optimizing STM32F4Discovery builds with FPU-enabled protected mode, and refactoring tickless RTC code for cross-board consistency. Enhanced code quality and toolchain compatibility by suppressing compiler warnings, correcting type definitions, and updating includes for modern C and C++ compilers. These efforts reduced simulation risk, improved runtime efficiency, and lowered maintenance overhead through targeted code maintenance and compiler optimization strategies.