Build iOS + Android App "BetOnYou" - Fitness & Study Challenge App with Razorpay | Flutter

Hi, I need a Flutter developer to build an MVP mobile app called "BetOnYou" for iOS + Android. CONCEPT: A "self-improvement commitment platform" where users deposit ₹100 and complete challenges. If they complete it, they get ₹200. If they fail, they lose deposit. Tagline: "₹100 Laga. Khud Ko Prove Kar. Double Kama." BUDGET: $1800-1900 USD | TIMELINE: 7-8 Weeks | FIXED PRICE CORE FEATURES FOR V1: 1. AUTH & WALLET - Google/OTP Login - UPI Deposit & Withdraw via Razorpay or Cashfree - Wallet to show balance and transaction history 2. 2 CHALLENGES ONLY FOR MVP A. Fitness: 7-day 10,000 steps challenge. Verify via Google Fit / Apple Health API + Photo upload B. Study: 14-day 2hr study challenge. Verify via AI Camera on + Daily 5 question quiz 3. CORE APP LOGIC - User pays ₹100 → Joins challenge → 7/14 day Timer starts - Daily proof submission → Admin + AI verification - Win: ₹200 credited in 48hrs | Fail: ₹100 with 20% platform fee - Push Notifications & Reminders - Leaderboard + Streaks + "Share Win on Instagram" image template 4. OTHER - Pro Subscription ₹299/mo: No platform fee + Unlock more challenges later - Admin Panel: To approve disputes, see users, manage challenges - Clean Modern UI with Dark + Neon theme - Legal Page + T&C: "This is a Skill Commitment Platform. Not Gambling." TECH STACK REQUIRED: Flutter, Firebase for Auth/DB/Notifications, Razorpay/Cashfree for payments REQUIREMENTS: 1. Must have built apps with Razorpay/UPI payments before. Show proof. 2. Must have experience with Firebase + Push Notifications + Health APIs 3. Good communication on WhatsApp/Slack 4. Will handle Play Store + App Store publishing DELIVERABLES: 1. Full Source Code 2. Admin Panel Web 3. Play Store + App Store Live 4. 3 months bug support IMPORTANT: Start your proposal with the word "BETON" so I know you read this. Also tell me: 1. Your past similar work 2. How you will handle payment + verification Looking forward to working with you!