Freelancer Proposal: Jackpot Lottery Sweepstakes App (Android) Project Overview I am seeking an experienced Flutter developer to build a mobile Android app for a lottery-style sweepstakes game called “Jackpot Lottery Sweepstakes”. The app will allow users to: Sign in with Google account Watch rewarded video ads to earn credits Pick 10 numbers from 1–100 Submit picks for a random draw (server-side RNG) Earn credits for matching numbers, and cash out credits Compete for a $1,000,000 jackpot (insured) Track user location for eligibility and fraud prevention The app must be secure, compliant with Google Play policies, and resistant to manipulation. Key Features 1. User Authentication Google Sign-In via Firebase Auth Unique user identification Anti-fraud measures 2. Lottery Mechanics Users pick 10 numbers (1–100) Server-side draw of 10 random numbers Credits awarded per matched number Jackpot awarded for 10/10 matches (insured) Odds displayed in-app 3. Credits System Credits earned via: Watching ads (1 credit/ad) Lottery matches (1 credit per correct number) Credits can be cashed out once minimum threshold reached Server-side tracking only (prevent tampering) Manual verification of payouts 4. Rewarded Video Ads AdMob integration Must be Google Play compliant Credits granted for ad completion 5. Cash-Out System Credits have micro-value (e.g., 1 credit = $0.001) Minimum cash-out: $5 Payout via PayPal or gift cards Server-side tracking and anti-fraud measures Manual review required 6. Location & Security Capture user location via GPS for fraud prevention Anti-manipulation: Server-side RNG Firebase App Check Rate-limiting entries and ad credits Backend Requirements Firebase (Auth, Firestore, Cloud Functions) Server-side RNG and credit tracking Cash-out handling function Security rules to prevent hacking Logs for jackpot verification Design Requirements Simple, mobile-friendly UI Responsive number picker (1–100) Credit display Ad button Submit lottery numbers button Jackpot and result notifications Technical Requirements Flutter (Android only) Firebase backend AdMob rewarded ads Geolocator for location capture Server-side Cloud Functions for RNG and cash-out Well-documented code with setup instructions Compatible with latest Android SDK and Google Play policies Deliverables Flutter Android project with working app Firebase setup instructions and Cloud Functions Integrated AdMob rewarded ads Fully functional credit and cash-out system Tested anti-fraud / anti-cheat system User guide and maintenance instructions Optional Add-Ons (Bonus) Referral system Analytics integration (Firebase Analytics) Leaderboard Freelancer Requirements Proven experience with Flutter + Firebase apps Experience integrating AdMob rewarded ads Experience building secure sweepstakes or lottery apps Knowledge of Google Play policies for sweepstakes and ad-based apps Good communication skills and ability to deliver on schedule Timeline & Budget Timeline: 6–10 weeks (can be negotiated based on experience) Authentication + basic lottery UI Server-side RNG and draw logic Ad integration + credit system Cash-out system + anti-fraud Final testing & delivery Proposal Instructions Provide examples of previous Flutter/Firebase apps, preferably with lottery, sweepstakes, or ad integration experience Include your estimated timeline and cost Brief description of your approach to prevent cheating / fraud Include any suggestions to improve app security or monetization