During June 2025, Taeyoung Kim developed foundational documentation for binary search trees across the krafton-jungle/KJ-ALGO-BOOK-9-303 and krafton-jungle/KJ-DS-BOOK-9-303 repositories. He authored detailed drafts outlining BST concepts, node structures, traversal algorithms, and API design, using Markdown to ensure clarity and maintainability. By establishing a cross-repository knowledge base, he improved onboarding and set a consistent standard for future development. His work demonstrated strong command of algorithms and data structures, focusing on both theoretical depth and practical application. The documentation addressed core BST operations and performance considerations, providing a robust reference point for subsequent implementation and product roadmap alignment.