Alex focused on backend development and database migration for the novuhq/novu repository, addressing a critical issue with subscriber deduplication during migration processes. Using TypeScript, Alex implemented a targeted bug fix that ensures the removeDuplicatedSubscribers function is invoked at the end of migration scripts, directly reducing the risk of subscriber duplication and improving data integrity for downstream campaigns. The solution was minimal and well-scoped, introducing a direct call within the migration workflow to trigger the deduplication script. This approach provided a clear rollback path and enhanced the reliability of subscriber data, reflecting careful attention to stability and maintainability.