During June 2025, this developer focused on enhancing documentation and repository organization for krafton-jungle/KJ-ALGO-BOOK-9-303 and krafton-jungle/KJ-DS-BOOK-9-303. They restructured Markdown documentation for core data structures, including Hash Table, Trie, and Binary Heap, to improve discoverability and onboarding for new contributors. Their work included drafting new READMEs, updating branch creation instructions, and reorganizing summary files to ensure clarity and consistency across repositories. By leveraging skills in technical writing, Git, and data structures, they addressed maintainability and reduced support overhead, enabling faster onboarding and a more consistent contributor experience without introducing new bug fixes.