Worked on core Typelevel libraries, focusing on enhancing error handling and debuggability in Scala-based functional programming environments. Delivered targeted improvements to error messages in the cats-effect repository, adding descriptive precondition messages to modules such as TestContext, Backpressure, and Queue. In the fs2 repository, improved error reporting for array slicing by introducing specific require statements in ChunkPlatform.scala and Chunk.scala, clarifying out-of-bounds failures. These changes aimed to reduce diagnosis time and support onboarding by providing actionable feedback. Demonstrated skills in concurrency, library development, and error handling, with a focus on improving the developer experience across streaming and effects components.