Alex Zayats enhanced the microsoft/kiota-java repository by improving the RetryHandler to robustly parse Retry-After HTTP headers, including support for comma-separated values that indicate multiple retry intervals. Using Java and focusing on backend development and error handling, Alex implemented comprehensive unit tests to validate the parsing logic against a variety of valid and invalid inputs. Additionally, Alex performed code formatting cleanup to align with coding style guidelines, increasing maintainability. These changes improved the reliability and predictability of API retry behavior, reduced the risk of miscomputed backoff intervals, and ensured the codebase remains easier to test and maintain in the future.