Developed wildcard parameter support for foreign function declarations in both the ferrocene/ferrocene and Wilfred/rust-analyzer repositories, enabling more flexible and robust FFI usage in Rust. Focused on backend development and compiler design, the work included refactoring memory management to improve safety and future-proof cross-language interfaces. Enhanced the internal expression collector to efficiently process wildcard patterns, and expanded test coverage to ensure reliability across various declaration styles. Leveraged Rust and advanced pattern matching techniques to reduce future maintenance overhead, laying a solid foundation for ongoing pattern-based FFI improvements while maintaining a strong emphasis on code quality and testing practices.