Worked on enhancing the Playground Query API within the tree-sitter/tree-sitter repository, focusing on expanding the API’s capabilities and improving the reliability of query handling. Introduced a new Query class and refined the capture process to streamline prototyping and testing of grammars in the playground environment. Leveraged JavaScript and front end development skills, while also engaging with Rust-based tooling and parser API design to optimize performance and code quality. The improvements reduced friction for developers by enabling faster iteration and more reliable demos, ultimately supporting a smoother user experience and more productive feedback cycles in the playground interface.