Rhomast developed a comprehensive migration guide for the helidon-io/helidon repository, focusing on the transition from Helidon 3 to Helidon 4 by addressing the removal of RequestPredicate. He authored detailed documentation in AsciiDoc and Java, providing practical code examples and a clear upgrade path to help developers adapt their routing logic using alternative methods in Helidon 4. His work emphasized clarity and user guidance, reducing migration risks and improving onboarding for new users. While no bugs were fixed during this period, the depth of the documentation and the focus on API migration and Java development enhanced the overall developer experience.