Marcin Krystianc focused on enhancing large data export capabilities in the apache/arrow-dotnet and mathworks/arrow repositories by addressing a critical memory management limitation. He upgraded the ExportedAllocationOwner component’s memory tracking from 32-bit to 64-bit integers using C#, which removed the previous 2GB export cap for Record Batches and improved memory safety. Marcin ensured cross-repository consistency by applying the fix and adding targeted tests to verify overflow handling. His work demonstrated depth in bug fixing and data export, directly supporting analytics pipelines and production workflows. The changes reflected careful technical execution and a disciplined approach to robust .NET memory management.