Worked on hardening the U-Boot bootloader in the flipperdevices/u-boot repository by addressing buffer overflow vulnerabilities in environment handling and configuration prompts. Focused on embedded systems and system programming using C, the developer replaced unsafe string operations such as strcpy and sprintf with safer alternatives like snprintf, introducing explicit bounds checks to mitigate overflow risks. Delivered targeted fixes across nanopi2, samsung, and toradex boards, ensuring consistent safe string handling and improving boot reliability. The work emphasized maintainability and auditability through clear commit messages, in-code safety patterns, and thorough testing, demonstrating strong skills in buffer management and secure coding practices.