Miguel worked on the fleek-network/lightning repository, focusing on hardening Deno Fleek Permissions to improve security and reliability. He replaced panics triggered by disallowed file system and network operations with explicit permission errors, ensuring that unauthorized actions now return clear, manageable responses. By restricting access to system-level APIs, Miguel reduced the risk of unauthorized operations and improved the maintainability of the codebase. His work centered on backend development and system programming using Rust, with a strong emphasis on security. These changes enhanced error handling, reduced the risk of outages, and contributed to a more stable and debuggable system overall.