During January 2026, Eric Hetzner updated the staging CORS policy for the chanzuckerberg/single-cell-explorer repository, focusing on backend development and API security. He implemented a configuration that allows requests only from specific origins, enhancing both the flexibility and safety of development and testing workflows. Using Python, Eric addressed the need for controlled cross-origin resource sharing by refining CORS settings to support secure collaboration without exposing the staging environment to unnecessary risk. This targeted feature work demonstrated a practical application of API development and CORS configuration skills, delivering a focused solution that improved the development process without introducing new bugs.