During March 2026, Koszeggy focused on enhancing the correctness and reliability of BinaryWriter encoding in the filipnavara/runtime repository. He addressed complex edge cases in UTF-8 and UTF-16 handling, ensuring that derived classes behaved consistently and preventing encoding-related regressions. His work involved targeted bug fixes using C# and backend development skills, with a strong emphasis on unit testing to validate changes. By collaborating through code reviews and aligning with milestone planning for version 10, Koszeggy contributed to improved downstream compatibility and product stability. The depth of his engineering ensured robust encoding behavior and maintained backward compatibility for future releases.