Referrals and rewards form an important part of the VitalCard ecosystem. The platform tracks relationships between users across multiple referral levels and uses that data to calculate scores, rankings, and rewards. Instead of performing these calculations entirely inside application code, parts of the system were designed around optimized PostgreSQL queries and database views. This allowed complex datasets to be aggregated efficiently and made the results available to other parts of the product. Scheduled background processes keep these calculations up to date as new users, transactions, and referral activity enter the system. The result is a dynamic system where user activity can be transformed into measurable progress, rewards, and engagement within the platform.