During June 2025, Piotr Zielinski enhanced the dotty-staging/dotty repository by implementing inlay hints for named and by-name parameters in the presentation compiler. He refactored the PcInlayHintsProvider to accurately identify and render parameter hints, improving code readability and reducing cognitive load for developers using Scala. His work involved updating the Parameters data model to support a range of parameter types and function signatures, ensuring robust and context-aware inlay hints. Leveraging his expertise in compiler development, IDE features, and the Language Server Protocol, Piotr delivered a focused, well-structured feature that deepened the usability and reliability of the dotty presentation compiler.