Project Title: URGENT: High-End Reward App 'Kamyabi Cash' - FIXED BUDGET $350 TO $420 (Full Security & Logic)

Project Description: "I am looking for a TOP-LEVEL, honest, and professional Android & Backend Developer to build a high-security 'Watch to Earn' Reward App (Kamyabi Cash). STRICT TERMS - PLEASE READ BEFORE BIDDING: FIXED BUDGET RANGE: My total fixed budget for this project is between $350 and $420. This covers everything from UI/UX Design to final Play Store Deployment. Your bid within this range will be considered the FINAL price. Do NOT bid if you plan to increase the price later or ask XXXX XXXX charges for 'phases.' DETAILED SCOPE: I have a 100% complete 'Scope of Work' (SOW) document ready. I will share it in the inbox. You must follow every single logic mentioned. MILESTONE STRUCTURE: The total agreed amount will be divided into 3 Milestones: Milestone 1 (25%): Professional UI/UX Design & Basic App Structure. Milestone 2 (40%): Full Integration (Ads, Games, Backend Logic). Milestone 3 (35%): Final Delivery & Play Store Deployment. PAYMENT RELEASE POLICY: Milestones will be created, but NOT a single dollar will be released until the final app passes my 5-Day Security Audit. I will personally test for: Multi-account creation (Device Fingerprinting / Hardware ID test). VPN/Proxy/Emulator bypass detection. Stability with 100+ simultaneous users. MANDATORY FEATURES: Unbreakable Security: Device ID/Hardware binding (Strict 1 Device = 1 Account policy). Anti-Fraud: 100% detection and blocking of VPN, Proxy, and Emulators. Ad Mediation: AdMob, Meta, AppLovin, Unity, and IronSource (Mandatory Ad-before-task flow). Gaming Platforms: 7 Platforms (BitLabs, AdGate, Gamezop, etc.) with server-side time-tracking. SIM-Based OTP: All profile changes and withdrawals MUST require a Sim-based SMS OTP (No WhatsApp). 3-Level Referral: Automatic & lag-free commission distribution (Level 1: 10%, Level 2: 7%, Level 3: 2%). Deadline: 20 to 30 Days. Daily progress updates are mandatory. If you are a professional developer or a team who respects technical logic and high-end security, please bid with your actual portfolio of similar reward apps. No time-wasters, please." Budget: USD 250–750 Skills: PHP, Web Security, Mobile App Development, MySQL, Laravel, UI / User Interface, Kotlin, Google Firebase, Hardware Security Module, API Integration