Senior Full-Stack Developer Needed to Transform Telegram Mini App into Production SaaS

Project Overview I have already built the UI/UX and frontend for a Telegram Mini App called Xzantra. The application focuses on: Trading Signals VIP Memberships Affiliate System User Dashboard Telegram Integration The frontend is mostly completed, but the backend architecture, database structure, business logic, and SaaS infrastructure need a professional rebuild. Goal Transform the current project from a prototype/demo into a production-ready SaaS platform. Required Skills Next.js React TypeScript Node.js PostgreSQL Prisma ORM REST API / Webhooks Telegram Mini Apps Authentication & Security SaaS Architecture Subscription Systems Affiliate Systems Dashboard Analytics Scope of Work Backend Development Design scalable backend architecture Create PostgreSQL database schema User management system Role management (User / VIP / Admin) Authentication Telegram Login Integration JWT Authentication Session Management Security Best Practices Subscription System Free Plan VIP Plan Subscription expiration Upgrade / Downgrade logic Affiliate System Referral tracking Commission calculations Affiliate dashboard Withdrawal requests Signal Management Signal creation Signal history Signal performance tracking Win rate calculations Admin Panel User management Subscription management Affiliate management Signal management Analytics dashboard Analytics Active users Revenue tracking Subscription metrics Conversion tracking Infrastructure Production deployment Environment management Error handling Logging Backup strategy Important This is NOT a simple landing page project. I am looking for someone with experience building real SaaS products that can scale to thousands of users. Please provide: Portfolio of SaaS projects Telegram Mini App experience (if available) Estimated timeline Estimated budget Recommended tech architecture