Group Discount Mobile App Development

I’m launching a mobile-only platform that turns every coupon into a team effort: users claim a deal today, and tomorrow everyone enjoys a steeper discount based on how many people joined in. I need an end-to-end build for both iOS and Android that makes this mechanic simple, fast, and fun... (Budget: $1500 - $3000 USD, Jobs: Android, Flutter, iOS Development, iPad, iPhone, Kotlin, Mobile App Development, Objective C, React Native)