During February 2026, Kolega enhanced security and reliability across several repositories, including goauthentik/authentik, mudler/LocalAI, milvus-io/milvus, and Helicone/helicone. Kolega implemented atomic recovery token handling and constant-time client secret validation in Django and Python to prevent race conditions and timing attacks. In C++ for milvus-io/milvus, Kolega addressed a use-after-free vulnerability by ensuring safe memory allocation. For Helicone/helicone, Kolega refactored SQL queries to use parameterized statements, mitigating injection risks. The work demonstrated strong backend development skills, with careful attention to security best practices, memory management, and robust database handling, resulting in reduced risk and improved code integrity.