Yekta K. Birgün focused on improving build reliability and speed for the Kotlin/kotlinx.serialization and Kotlin/kotlinx-atomicfu repositories by implementing cache redirector-based Gradle distribution downloads. Using skills in build configuration and tools, Yekta migrated both main builds and integration tests to route Gradle wrapper downloads through a cache redirector, addressing intermittent failures and reducing CI flakiness. The work, primarily involving Properties configuration, enhanced developer feedback loops by shortening build times and increasing setup reliability. Over the month, Yekta delivered one feature and resolved one bug, demonstrating a targeted approach to infrastructure stability and continuous integration efficiency within Kotlin projects.