Worked on enhancing the reliability and concurrency of the kamailio/kamailio repository by addressing a critical startup race condition related to SQLite in WAL mode. Focused on system programming and database management using C, the developer introduced a busy-timeout parameter within the SQLite database module. This technical solution mitigated failures during multi-process service initialization by allowing child processes to wait for database access, thereby reducing the risk of startup outages under high-concurrency scenarios. The work improved overall uptime and aligned with enterprise reliability goals, demonstrating a strong grasp of concurrency control and robust engineering practices in a production environment.