Worked on the nxp-upstream/zephyr repository to enhance cryptographic workflows and improve sample reliability within embedded systems. Introduced ECDSA signing support in the PSA Crypto application by adding a configuration option, enabling secure certificate signing request generation and preventing type mismatch errors. Addressed error logging in the AWS IoT MQTT sample, clarifying messages when adding CA certificates to streamline debugging and reduce resolution time. Employed C programming and cryptography expertise to deliver targeted, well-documented changes that increased project stability and maintainability. Demonstrated a methodical approach to IoT development, focusing on traceability, repeatable builds, and clear communication through precise commits.