During November, contributed to the mongodb/libmongocrypt repository by delivering a feature that enables configurable Data Encryption Key (DEK) cache lifetimes. This work involved refactoring the cache initialization process to use a default expiration constant, enhancing maintainability and consistency. Additionally, a new option was introduced to allow custom cache expiration times in milliseconds, providing runtime flexibility for diverse workloads. By leveraging skills in C, caching, and cryptography, the changes reduced DEK fetch latency and improved encryption throughput while preserving security guarantees. The feature supports performance tuning for client-side encryption scenarios, addressing both operational efficiency and secure configuration requirements.