Build a production-ready Software-as-a-Service web application with complete user management system including email/password authentication, OAuth social login (Google, Facebook, GitHub), email verification, password reset flows, and two-factor authentication for enhanced security. The subscription billing system powered by Stripe includes: multiple pricing tiers with feature gating, free trial management, payment method updates, invoice generation and history, usage-based billing options, subscription upgrade/downgrade flows, and automatic retry logic for failed payments. The comprehensive admin panel provides: user management with search and filters, subscription overview and analytics, revenue metrics and MRR tracking, churn analysis, and customer support tools. The analytics dashboard features real-time data visualization using Chart.js with customizable date ranges, exportable reports in CSV and PDF formats, and key performance indicators relevant to your business. Technical architecture includes: role-based access control (RBAC) with granular permissions, RESTful API with comprehensive documentation using Swagger, email notification system for important events (welcome, payment, alerts), audit logging for security compliance, and webhook support for third-party integrations. Built with React (frontend), Node.js with Express (backend), PostgreSQL (database), Redis (caching), and deployed on AWS with auto-scaling, load balancing, and automated backups. Includes 60 days of post-launch support and maintenance.