Worked on the medusajs/medusa repository to enhance backend reliability by addressing a critical bug in customer group management workflows. Focused on strengthening data integrity and rollback safety, the developer refined the rollback process in TypeScript to ensure that only newly created customer groups are deleted during failure scenarios, thereby preventing unintended data loss of existing records. This targeted fix improved the stability of core flows and reduced operational risk in production environments. Leveraging backend development expertise and TypeScript, the work laid a foundation for more resilient data operations and safer rollbacks in future sprints, emphasizing careful, incremental improvements.