Over 20 months, contributed to Mbed-TLS/mbedtls-framework and related repositories by building robust cryptographic infrastructure, modernizing APIs, and strengthening test automation. Focused on C and Python, delivered features such as PSA Crypto integration, threading and entropy subsystem refactors, and configuration validation using CMake and Makefile scripting. Improved build reliability and cross-platform compatibility by refining Docker-based CI, enhancing error handling, and automating configuration checks. Addressed security and portability through code refactoring, documentation, and migration guides. The work emphasized maintainability and early defect detection, enabling safer cryptographic deployments and streamlined onboarding for developers integrating PSA and TLS features across embedded systems.