During a two-month period, Invakid404 contributed to windmill-labs/windmill and BoundaryML/baml, focusing on backend reliability and developer experience. For windmill-labs/windmill, Invakid404 improved flow processing by refining regular expressions in Rust to accurately parse root paths in for-loop flows and upgraded Dockerfiles to Rust 1.81.0, enhancing build security and stability. In BoundaryML/baml, Invakid404 addressed potential deadlocks in asynchronous Rust workflows by wrapping blocking FFI callbacks with block_in_place, allowing Tokio to optimize scheduling and reduce production latency risks. The work demonstrated depth in backend development, containerization, and asynchronous programming, with targeted solutions that improved runtime predictability and maintainability.