In April 2026, Maria Tigina focused on backend development for the JetBrains/koog repository, addressing a critical streaming error in OpenRouter during tool-call sequences. She implemented a targeted bug fix using Kotlin, restoring reliable prompt execution and reducing runtime failures in automated streaming workflows. Her approach included expanding test coverage for streaming scenarios and updating documentation to clarify new error handling behaviors. Maria collaborated closely with co-author Anastasiia Zarechneva, ensuring the pull request remained aligned with the develop branch. This work demonstrated depth in backend engineering, testing, and documentation, ultimately improving stability for users relying on streaming with tool calls.