Worked on the kamailio/kamailio repository to enhance build reliability and authentication security through targeted improvements in build configuration and library integration. Addressed a build issue in the GeoIP2 module by correcting a typo in the CMakeLists file, ensuring proper linkage with geoip2 libraries and reducing the risk of runtime failures. Integrated OpenSSL as a dependency for the auth_ephemeral module, enabling SSL and cryptographic functionalities to strengthen authentication flows. Utilized CMake for build management and focused on secure defaults, aligning with project goals for stability. Demonstrated attention to detail and risk mitigation in both feature development and bug resolution.