Billav worked on enhancing the parsing and code generation pipeline for the tauri-apps/cef-rs repository, focusing on improving the accuracy and maintainability of Rust bindings. He introduced a refined Abstract Syntax Tree (AST) structure that clearly distinguishes between struct fields and methods, enabling more precise code representation. By implementing dedicated FieldDeclaration and MethodDeclaration nodes and improving method argument handling, including correct emission of &self parameters, Billav addressed common sources of code generation errors. His work leveraged Rust and advanced parsing techniques, resulting in more reliable struct definitions and method signatures, which reduced downstream debugging and streamlined future maintenance for the project.