During June 2025, Mateusz worked on the software-mansion/react-native-executorch repository, focusing on enhancing the stability of its speech-to-text pipeline. He addressed a critical edge case by fixing a guard clause in TypeScript, ensuring that chunk merging only occurs when appropriate. This change prevented the system from entering an infinite generating state when processing very short audio inputs, thereby improving reliability for mobile users. Mateusz applied his skills in JavaScript, TypeScript, and mobile development to deliver a targeted bug fix that reduced production failures. His contribution demonstrated careful attention to edge-case handling and code robustness within a complex codebase.