Pulumi's watch mode enhances infrastructure as code development by providing a hot reload-like experience, enabling rapid prototyping and iteration. Initially, it faced challenges due to its dependency on a Go-based file-watching library that struggled with cross-compilation, especially on Apple Silicon Macs. To address these issues, Pulumi transitioned to a Rust-based implementation, capitalizing on Rust's active maintenance and cross-platform capabilities, while eliminating the need for cgo and ensuring efficient performance across all supported platforms. This shift not only resolved the compilation issues but also maintained Pulumi's mission of leveraging the best programming languages and tools to optimize infrastructure development. The new implementation, known as pulumi-watch, reduces deployment iteration times and simplifies the developer workflow by automatically running deployments without requiring manual commands. This improvement demonstrates Pulumi's commitment to innovation in engineering practices, offering a more consistent and efficient user experience.