During August 2025, Stefano Furi developed modular, scalable Language Server Protocol (LSP) features for Kotlin in the kotlin-lsp and JetBrains/intellij-community repositories. He introduced a Scoped/Isolated Documents Mode, enabling per-document isolated analysis and overlayed indexing to support multi-client environments and concurrent edits. Stefano architected a new module for code completion in scoped mode, optimizing project structure handling and reducing cache invalidations for faster, more accurate suggestions. His work leveraged Kotlin and Java, focusing on backend development, concurrency, and API design. These contributions established a robust foundation for multi-repository LSP deployments, improving responsiveness and reliability for IDE integrations.