Qvd worked on advanced cryptographic and formal verification features across the leanprover-community/batteries and GaloisInc/jolt repositories. In Batteries, they implemented dependent folds for the Fin type in Lean, introducing dfoldr, dfoldl, and their monadic counterparts, supported by helper loops and formally proven theorems to ensure correctness and equivalence with existing folds. For Jolt, Qvd optimized Arkworks-based field arithmetic in Rust, upgraded dependencies, and refactored polynomial commitment logic to integrate Gruen’s optimization into the Spartan protocol. Their work demonstrated depth in functional programming, type theory, and performance optimization, resulting in more reliable, efficient, and mathematically robust cryptographic codebases.