Worked on the uber/NullAway repository to enhance nullability analysis for Java streams by addressing a bug in how nullability facts are propagated through stream operations. Focused on ensuring that the sorted() operation acts as a passthrough in the nullability propagator, allowing information established by filter operations to persist downstream. Implemented a regression test that mirrors a real-world failing pipeline, specifically covering filter, sorted, map, and collect operations, to prevent future regressions. Collaborated with another contributor to deliver this fix using Java and software testing skills, resulting in improved reliability and reduced false positives for stream-based code paths in NullAway.