Worked on security and reliability improvements across open source JavaScript projects, focusing on both feature development and bug fixing. In the github/eslint-plugin-github repository, added comprehensive test coverage for async event handling lint rules, ensuring the linter reliably detects improper use of event.currentTarget and event.preventDefault after awaits in async functions. Later, in withastro/astro, addressed a cross-site scripting vulnerability by implementing secure prop encoding for server components, escaping ETAGO delimiters and HTML comment syntax during JSON stringification. Leveraged JavaScript, TypeScript, and security best practices to enhance code safety, maintainability, and downstream project resilience through targeted, well-documented contributions.