Varun Gupta developed PCI Express 7.0 support in the microsoft/mu_basecore repository, focusing on updating MdePkg header files, introducing new register definitions, and aligning data structures to the latest PCIe 7.0 standard. Working in C, he ensured that the new headers and register bit fields were consistent with existing definitions, enabling forward compatibility for future PCIe devices. His work addressed hardware interface and system programming challenges, reducing integration risks for hardware teams and preparing the codebase for downstream firmware development. The effort emphasized maintainability and traceability, with documentation and cross-team visibility, reflecting a deep, standards-driven engineering approach.