During April 2025, Ayoub Omari focused on backend stability within the m1a2st/kafka repository, addressing a critical issue in INNER JOIN processing involving NULL foreign keys. Using Java and Kafka, he corrected the foreign key transition logic to ensure that data integrity is maintained when switching between NULL and non-NULL values during join operations. This work prevented potential data loss and preserved the reliability of join results, directly improving the robustness of backend data flows. Although no new features were delivered, Ayoub’s targeted bug fix demonstrated a deep understanding of backend data consistency and transactional processing in distributed systems.