Prateek Rathour contributed to backend reliability and correctness across multiple open source projects, focusing on Kyverno, PyTensor, and Nix Security Tracker. In Kyverno, he enhanced webhook handler robustness by introducing independent contexts and per-operation timeouts using Go, preventing premature cancellation of background tasks. For PyTensor, he addressed numerical computing issues in Python, fixing matrix pseudoinverse output shapes and adding bounds validation to prevent runtime errors. On the Nix Security Tracker, he improved ingestion and evaluation stability with Django and asynchronous programming, implementing EOF-driven stops and concurrency gates. His work demonstrated depth in backend development, testing, and concurrent systems engineering.