Worked on enhancing code completion user experience in Swift by developing targeted features across the Wilfred/sourcekit-lsp and swiftlang/swift-syntax repositories. Focused on closure placeholder expansion, the work introduced a ClosureCompletionFormat class and refactored placeholder translation logic to improve handling of nested placeholders and LSP snippet translation. In swiftlang/swift-syntax, delivered a customizable API for closure placeholder expansion, supporting multi-line trailing closures and full-closure wrapping. Leveraged skills in Swift, API design, and syntax tree manipulation to harmonize placeholder-to-snippet behavior across repositories, resulting in more consistent and productive code completion for closure-heavy codebases. No major bugs were addressed this period.