Worked on the VoiceInk repository to enhance stability and reliability in the model download and transcription pipelines for iOS. Focused on concurrency management and error handling, the developer implemented atomic guards in Swift to prevent double resumption of continuations, directly addressing EXC_BREAKPOINT crashes. A reusable error-handling helper pattern was introduced, along with improved cancellation handling in the downloadFileWithProgress function, ensuring predictable failure behavior. These changes reduced the crash surface and delivered a more robust user experience during model downloads and transcription. The work established foundational patterns for error handling and cancellation, supporting future feature development and faster iteration.