From Demo to Production: Architectural Lessons from a Shopping List App

This hands-on case study demonstrates how production-grade architecture principles—CQRS, real-time synchronization, and comprehensive observability—apply to even small applications. Rather than building isolated demos, the author treats a shopping list app like a real production system, forcing realistic architectural trade-offs. For developers looking to move beyond toy projects, this offers practical insights into when complexity is worth adopting and when simplification makes sense.