During December 2024, this developer enhanced the PolyhedraZK/Expander repository by delivering a foundational architectural improvement focused on elliptic curve cryptography (ECC) operations. They exposed new expander-exec APIs and refactored the executor logic into a dedicated module, using Rust and macro programming to improve modularity and system design. This approach established a more maintainable and extensible codebase, enabling easier integration of future ECC features. Although no bugs were fixed during this period, the work prioritized API readiness and modular architecture, setting the stage for faster feature expansion and smoother downstream integration of ECC functionality in related applications.