Technical Research and Architectural Plan for 'Classic Union': A Scalable Event Organizing Platform using Flutter and Firebase

This paper details the technical architecture for ‘Classic Union,’ a highly scalable, event-driven application designed to streamline event organization and management. The system employs a robust hybrid technology stack, utilizing Flutter for cross-platform presentation and a serverless Firebase backend (comprising Firestore, Authentication, and Cloud Functions). A local SQLite database is strategically integrated to facilitate complex querying and advanced offline data persistence. The primary architectural contribution addresses the critical challenge of high- contention concurrency risks inherent in distributed booking systems. The methodology leverages a modified Clean Architecture pattern, specifically adopting the BLoC/Cubit pattern to ensure a rigorous separation of concerns. Key transactional logic, specifically event slot reservation and secure payment processing, is securely elevated to Firebase Cloud Functions (CF). This server-side approach guarantees data integrity by implementing atomic transactions for concurrency mitigation and secure webhook integration (Stripe) for payment finalization. The resultant system is engineered for exceptional maintainability, resilience against typical race conditions, cost optimization through selective local data caching, and seamless scalability necessary for supporting large-scale event operations.