Worked across scalameta/scalameta, sbt/zinc, and scala/scala3 to deliver eight features and one bug fix focused on improving Scala tooling and code intelligence. Enhanced SemanticDB core by exposing new APIs and refining symbol analysis, while strengthening incremental compilation and dependency tracking in sbt/zinc to reduce unnecessary recompilations. Improved parser accuracy and metadata handling, and increased file I/O robustness by handling inaccessible paths gracefully. Contributed regression tests and annotation detection improvements in scala/scala3, aligning compiler behavior with scalameta. Leveraged Java and Scala expertise, applying skills in API development, compiler design, and semantic analysis to deliver more reliable, maintainable developer tooling.