Juan Framil enhanced the prefapp/tfm repository by improving the Azure Windows VM module, focusing on simplifying configuration and expanding deployment capabilities. He removed redundant parameters such as osdisk and os_managed_disk_id, reducing potential configuration errors and streamlining the setup process. Leveraging Terraform and HCL, Juan introduced support for Ultra SSD storage tiers and VM hibernation, enabling more flexible and performant Windows workloads on Azure. He updated documentation and configuration files in Markdown to ensure alignment with these new features. The work demonstrated a solid grasp of Infrastructure as Code principles, delivering targeted improvements within a focused, month-long development period.