June 2025 monthly summary: Focused on security-enabled authentication features and robustness of OAuth token flows across Kafka and KSQL. Key features delivered include Kafka OAuth JWT Bearer Grant Support enabling clients to obtain and use JWTs for authentication, with configuration hooks for JWT retrieval and validation and a backward-compatible refactor of OAuth components. Major bugs fixed include KSQL OAuth token retrieval error handling improvements by replacing generic exceptions with Kafka-specific JwtRetrieverException and updates to tests to assert JwtRetrieverException. Overall impact includes strengthened security posture, broader OAuth JWT compatibility, reduced token-related failures, and alignment with upstream Kafka efforts. Technologies and skills demonstrated include OAuth 2.0 JWT flows, JWT creation/validation, Java security module refactors, robust exception handling, and test/merge readiness.