During April 2025, Vassil worked on the CleverTap/clevertap-android-sdk repository, focusing on enhancing the reliability of push permission handling and configuration flow within the Android SDK. Using Java and Kotlin, Vassil introduced robust null checks and reset logic to maintain a stable permission state, addressing edge-case failures in push prompts. He also ensured consistent configuration usage across related components, reducing the risk of state drift. Additionally, Vassil improved the test environment by removing outdated JUnit 5 API references, streamlining unit testing and maintenance. His work demonstrated depth in Android and SDK development, prioritizing stability and maintainability over new feature delivery.