Over a two-month period, this developer enhanced documentation clarity in the zephyrproject-rtos/hal_rpi_pico and ros2/ros2_documentation repositories, refining Doxygen comments and clarifying service semantics to streamline onboarding and reduce ambiguity for maintainers. In apache/nuttx, they improved cryptographic reliability by decoupling curve25519 and idgen from entropy pool dependencies, ensuring consistent builds and preventing linker errors. They also integrated hardware-accelerated SHA-256 support for RP23xx devices, addressing byte order issues and updating build configurations using C, CMake, and embedded systems expertise. Their work emphasized maintainability, modularity, and robust documentation, directly supporting both developer experience and secure, reliable embedded software builds.