Worked on the zio/zio repository to deliver a parallel stream processing performance optimization for ZChannel, focusing on the mapOutZIOPar method. The approach involved reworking fiber and promise handling within the internal queue and refactoring the toPullIn method to toPullInAlt, targeting improved throughput and reduced contention under high-concurrency workloads. This optimization aimed to enhance the efficiency of user-facing features relying on parallel stream processing. The work demonstrated strong skills in Scala, concurrency primitives, and functional programming, with an emphasis on performance instrumentation and queue management. No major bugs were reported, as the focus remained on reliability and throughput improvements.