During February 2025, Mankulka contributed to the kubernetes/kubernetes repository by delivering two backend features focused on Windows system programming using Go. He enhanced cross-platform reliability by refining Windows socket and file type detection, leveraging os.ModeSocket and os.Stat to streamline type checks and remove legacy workarounds. Additionally, he implemented support for the new ModeIrregular file mode introduced in Go 1.23 within the getFilePerm function, ensuring accurate permission evaluation for irregular files. These changes improved test coverage and future-proofed the codebase for upcoming Go versions, demonstrating depth in Windows development and backend engineering with a focus on maintainability.