Worked on reliability and maintainability improvements for Zephyr-based embedded systems, focusing on the renesas/zephyr and zephyrproject-rtos/zephyr repositories. Addressed I2C communication robustness by enhancing error handling and implementing a bus recovery mechanism in C, ensuring state restoration for SCL and SDA lines. Improved documentation quality by correcting inaccuracies and clarifying code comments, including fixing a macro reference typo in the nRF pinctrl driver using reStructuredText. Demonstrated careful attention to project conventions and commit traceability, contributing both feature development and bug fixes. The work strengthened system resilience and documentation clarity, supporting production-grade embedded driver development and technical writing standards.