Looking for Expert Team to Build FULL CUSTOM Mobile App (NO Agora / NO 3rd-Party SDK) Hello Freelancers, We are looking for a highly experienced mobile app development team or individual to build a large-scale FULL CUSTOM real-time communication platform. Important: This project must be developed using FULL CUSTOM technology. No Agora No Twilio No third-party calling or messaging SDK No ready-made WebRTC SaaS platforms All signaling, media handling, backend logic, scaling, and security must be implemented from scratch. Only expert-level developers should apply. Core Features (Full Custom System) Video & Voice Communication Video Call (1-to-1 and Group) Voice Call (1-to-1 and Group) Screen sharing during calls Meeting system with host and participant controls (similar to Zoom) Call and meeting recording Call and meeting history Teaching and learning via calls Billing and disbursement from teaching sessions Notification and alert system for users Custom Chat System One-to-one chat Group chat Broadcast group (Message sent once, delivered as individual inbox messages) Group creation for chat and calls Invite friends using contact list Referral link sharing Device & Call Utilities App-to-SIM SMS App-to-SIM call Full call history tracking NFT & Token System Video calling NFT token Tracking video NFT token Token-based access control Affiliate & Wallet System Three-generation affiliate earnings Earning wallet Main wallet (for all charges) Wallet-to-wallet transfer between users Add referral after signup if skipped initially Earning wallet integration with existing defilink.org database Plan-2: Tracking, Boost & Entertainment Module Tracking System Real-time location tracking Geo-fence Nearby friends tracking Group-based tracking Special member tracking Distance-based search (meter-based) Event attendance tracking (leader controlled) Kids tracking system School and home attendance confirmation Emergency call feature Boosting & Commission System Internal boosting system Commission-based boosting Social media data or cookie-based boosting logic Entertainment & Utilities Live TV (local and international) Live cricket and football score view Live radio Live weather updates Technical Requirements Custom signaling server Custom media server or streaming pipeline Strong experience with low-latency audio and video systems Understanding of SFU and MCU architectures Mobile App: Flutter, React Native, or Native Android and iOS Backend: Node.js, Go, or Rust (proposal-based) Database: PostgreSQL, MongoDB, Redis Scalable and secure architecture (microservices preferred) Secure wallet and affiliate system Full source code and technical documentation required Who Should Apply Proven experience in building custom real-time communication platforms Strong knowledge of WebRTC internals, RTP/RTCP, and signaling Experience with media servers and real-time streaming Experience with wallet, fintech, or affiliate systems Strong DevOps and system scaling skills Include in Your Proposal Timeline and milestone breakdown Estimated budget Post-launch support and maintenance plan