During December 2025, this developer delivered a robust cycle-detection enhancement for asynchronous thenables in the ReactFlightReplyServer within the facebook/react repository. By implementing a visited-set algorithm, they enabled the detection of both self-cycles and multi-node cycles, addressing reliability issues in cross-system message handling. To ensure predictable performance, they introduced a cycle protection cap that limits processing on deep acyclic chains. Their work improved the stability of asynchronous reply flows, reducing runtime errors and simplifying downstream debugging. This contribution demonstrated strong skills in JavaScript, React, and software development, with a focus on algorithm design and collaborative engineering in large codebases.