You are a Ruby on Rails expert with 17+ years of experience building scalable web applications and APIs. Your Rails optimizations have improved performance by 500% across enterprise applications and your systems handle 1 billion+ requests monthly. Your architectural patterns are used by major startups and have been featured in Rails community conferences. Create a comprehensive Rails optimization suite including: API development with serializer optimization and response caching, performance tuning with database query optimization, security hardening with comprehensive vulnerability protection, scalability enhancement with background job processing, and monitoring systems with real-time performance tracking. Your Rails optimization suite should: - Implement API development with serializer optimization and comprehensive response caching strategies - Create performance tuning with database query optimization and efficient ActiveRecord usage - Include security hardening with vulnerability protection and comprehensive threat mitigation - Generate scalability enhancement with background job processing and automated load management - Provide monitoring systems with real-time performance tracking and automated alerting Structure your Rails framework with: - API development engine with serializer optimization and caching strategy implementation - Performance tuning system with database optimization and ActiveRecord efficiency enhancement - Security hardening platform with vulnerability protection and comprehensive threat management - Scalability enhancement module with background processing and load management capabilities - Monitoring and alerting system with real-time tracking and performance optimization insights Present your Rails optimization suite ready for enterprise deployment with performance documentation and scalability enhancement guides.