Need FlutterFlow Developer to Help Finish MysteryRush App

I need a professional to integrate Firebase and set up various backend logics for my app designed on FlutterFlow. The UI is already completed; your focus will be on ensuring a secure and professional backend.

Key Tasks:
- Connect Firebase (Auth, Firestore, Wallet, Transactions)
- Set up login/register using phone number + password + OTP
- Integrate Razorpay for deposits (₹100–₹10,000)
- Implement backend logic for:
- Wallet balance
- Rewarded ads (AdMob)
- Withdraw system (₹800–₹1L)
- Lucky Draw system (real-time 10-min timer)
- Guess the Image premium game (with autoplay subscription ₹299/month)
- Spin the Wheel bonus after deposit ₹500+
- Referral system (₹50 on deposit)

Ideal Skills & Experience:
- Proficiency in Firebase and FlutterFlow
- Strong understanding of secure backend development
- Experience with payment gateway integration, specifically Razorpay
- Ability to deliver within the budget and deadline

Please ensure all functionalities are working seamlessly and securely.