In October 2025, Ivan Shubin enhanced the hhru/frontik repository by implementing robust CORS preflight handling and refining OPTIONS routing across API endpoints. He focused on backend development using Python and FastAPI, introducing a dedicated preflight routing path to ensure reliable cross-origin requests for frontend clients. Ivan refactored and renamed the preflight router to improve code clarity and long-term maintainability, while also developing automated tests to validate consistent OPTIONS behavior. His work addressed preflight failures and streamlined API routing, demonstrating depth in API development and testing practices, and resulting in a more reliable and maintainable backend service architecture.