During August 2025, Stefano Furi developed modular, scalable enhancements for Kotlin language tooling, focusing on the kotlin-lsp and JetBrains/intellij-community repositories. He implemented a Scoped/Isolated Documents Mode for the Kotlin Language Server Protocol, enabling per-document isolated analysis, overlayed indexing, and scoped request handling to support multi-client environments. Using Kotlin and Java, Stefano architected a dedicated module to optimize code completion, improving project structure handling and reducing cache invalidations for faster, more accurate suggestions. His work addressed concurrency and backend development challenges, establishing a robust foundation for multi-repository LSP deployments and enabling responsive, reliable editing across diverse client connections.