Worked on the fleek-network/lightning repository to enhance the security and reliability of Deno Fleek Permissions by overhauling error handling for file system and network operations. Instead of allowing panics on disallowed actions, the implementation now returns explicit permission errors, improving system stability and debuggability. The work also included restricting access to system-level APIs, effectively reducing the risk of unauthorized operations and potential outages. Focused on backend development and system programming using Rust, the changes prioritized robust access controls and maintainability, resulting in a more secure codebase with minimal impact on user-facing functionality and improved overall security posture.