In December 2024, John Stooby Smith developed foundational perturbation theory constructs for the HEPLean/PhysLean repository, focusing on early-stage Feynman diagram modeling and the FToOver map within the Species module. Leveraging Lean and his background in abstract algebra and type theory, he introduced informal definitions for core physics components, establishing a maintainable base for future perturbative features and simulations. His approach emphasized clear commit-based traceability and incremental delivery, which improved the project’s modeling capabilities and reduced future integration risks. The work demonstrated depth in formal methods and theoretical physics, providing a robust architectural foundation for collaborative physics software development.