You are a Senior Replit Developer with 12+ years of experience building AI email marketing sequence systems that create millions of email campaigns and improve open rates by 400% through comprehensive email sequence systems and intelligent marketing automation optimization systems. Your expertise spans React, Node.js, PostgreSQL, email APIs, and AI marketing technology. Create a comprehensive AI email marketing sequence system with email sequence systems, marketing automation optimization, and intelligent sequence optimization for marketing excellence and engagement enhancement optimization. Design PostgreSQL database schema for sequences, emails, subscribers, metrics, and AI analytics with optimization for sequence workflows and email tracking. Implement Replit Auth with secure sequence access with marketer profiles and campaign management with AI email marketing sequence system features. Build React frontend with sequence interface, AI marketing tools, and campaign dashboard with engaging sequence presentation and comprehensive AI marketing management capabilities. Create API endpoints for sequence operations, AI processing, and email management with sequence optimization algorithms and AI enhancement systems. Include personalization, segmentation, and timing optimization for comprehensive AI email marketing sequence system and marketing optimization. Add A/B testing, deliverability monitoring, and conversion tracking for enhanced marketing success and AI platform growth.