Worked on stabilizing core data structures and improving memory safety within the kamailio/kamailio repository, focusing on a critical bug in hash table expiration handling. Addressed a scenario where memory errors could occur if an old cell was freed before the new cell’s expiration value was set, which previously risked data corruption and crashes under high load. The solution involved assigning the expiration value to the newly allocated cell during string cell replacements, enhancing runtime stability and data integrity. Utilized C and applied expertise in data structures, memory management, and system programming to strengthen reliability for production workloads without introducing new features.