Amandeep Singh focused on backend development and configuration management for the apache/celeborn repository, addressing a critical bug in multi-tenant identity resolution. He enhanced the DefaultIdentityProvider to consume user-provided tenant IDs and usernames from CelebornConf, ensuring that tenant information no longer defaulted incorrectly. This Java and Scala-based solution improved the reliability of tenant isolation by aligning runtime identity resolution with explicit configuration, reducing the risk of misconfiguration in production environments. His work demonstrated careful attention to unit testing and correctness, delivering a targeted fix that deepened the system’s support for multi-tenant deployments without introducing new features during the period.