Dan contributed to the aws/aws-lc repository by enabling IFMA-based RSA acceleration on Windows, focusing on cryptography and low-level optimization in C++. He updated CPU capability checks to recognize IFMA support, allowing Windows systems to leverage AVX-512 Integer Fused Multiply-Add instructions for faster RSA operations. Dan also addressed test reliability by adjusting memory allocation and refining the RSAZABI test harness, ensuring accurate detection of hardware features. His work improved Windows-specific cryptographic performance and maintained cross-platform parity, demonstrating depth in Windows development, memory management, and testing. The changes enhanced deployment readiness and strengthened test coverage for cryptographic operations.