Over 23 months, contributed to the Mbed TLS ecosystem by building and modernizing cryptographic infrastructure, test automation, and configuration management across repositories such as Mbed-TLS/mbedtls-framework and espressif/TF-PSA-Crypto. Delivered robust API refactoring, threading and entropy subsystem updates, and enhanced build reliability using C, Python, and shell scripting. Improved test coverage and CI/CD pipelines by introducing automated test generation, static analysis, and configuration validation. Focused on maintainability and portability, the work included migration guides, documentation, and modularization of build systems. These efforts reduced integration risk, accelerated feedback cycles, and enabled safer, more portable cryptographic deployments across platforms.