Sarthak contributed to kubernetes/minikube, facebook/pyrefly, and google/magika by modernizing CLI features, improving documentation, and refining backend logic. He updated flag parsing in Go for minikube to align with current standards, reducing maintenance risk. In pyrefly, Sarthak enhanced the CLI by preventing unnecessary file rewrites and added regression tests to ensure formatting integrity. He also clarified project structure through improved Rust documentation and fixed parameter handling in code extraction logic. For magika, he expanded installation options by adding Homebrew support, increasing accessibility for users. His work demonstrated depth in Go, Rust, CLI development, and technical writing across repositories.