Worked on enhancing security and reliability for the nrfconnect/sdk-zephyr repository, focusing on cryptographic and OTP handling for STM32 platforms. Addressed cryptographic failures by ensuring the random number generator clock remains active during public key accelerator operations, improving the stability of cryptographic processes. Hardened OTP access by introducing a memory protection unit region, allowing direct reads while restricting writes through the flash hardware abstraction layer API. These changes reduced cryptographic risk and improved secure data access. The work demonstrated proficiency in C programming, embedded systems, and hardware integration, delivering targeted improvements to microcontroller reliability and secure memory management within the platform.