Worked on enhancing the stability and reliability of SASL client authentication in distributed HBase clusters, focusing on both the apache/hbase and HubSpot/hbase repositories. Addressed two critical bugs by correcting the ClassLoader used for provider discovery, ensuring that the current class’s ClassLoader is utilized instead of the thread context ClassLoader. This approach reduced class visibility issues in complex, multi-classloader environments and improved the security posture of deployments. The work involved deep understanding of Java, Hadoop, and security best practices, aligning provider loading semantics across forks to ensure consistent and reliable authentication behavior without introducing new user-facing features during the period.