Points-Based Website Loyalty Program

I need a full-cycle implementation of a points-based loyalty program that lives on my website. Customers should automatically collect points every time they complete a purchase, view their balance inside their account area, and redeem rewards through a simple, self-service flow.

Besides the visible customer interface, I’ll need an easy-to-use admin dashboard where I can:
• set earn and redemption rules,
• run promotional multipliers,
• track user activity, and
• export data for marketing analysis.

Clean, modular code is essential because I may extend the program to a mobile app later on, so keep the architecture API-ready. Please outline your recommended tech stack, estimated timeline, and a brief example of similar work when you reply.