Worked on the PolyhedraZK/Expander repository to deliver a foundational architectural improvement focused on elliptic curve cryptography (ECC) operations. Developed and exposed new expander-exec APIs, refactoring the executor logic into a dedicated module to enhance modularity and extensibility. This approach, implemented in Rust and leveraging macro programming, established a robust API surface that supports future ECC feature integration and faster iteration. The work prioritized system design principles, resulting in improved maintainability and testability of the codebase. No major bugs were addressed during this period, as efforts centered on enabling easier downstream integration and setting a solid groundwork for future development.