Built a comprehensive multi-tenant SaaS platform with advanced features:
- Polymorphic profile system with delegated_type for Seller/Agent/Admin roles
- Multi-stage identity verification system (Interac, Stripe, RECO license validation)
- AI-powered document processing using OpenAI with admin correction workflows
- Stripe payment integration with authorization holds and success fee capture
- Complex state machine management for listings and bid workflows
- UTM campaign tracking and comprehensive analytics system
- Real-time notifications using Action Cable and Turbo Streams
- Comprehensive audit logging and change tracking
- 400+ tests ensuring platform reliability
- Email confirmation flows and role-based transactional email system
