QR-based Event Entry System

A QR-based check-in flow designed for speed and correctness under real constraints— clear states and auditability.

Manual validation created delays and inconsistency. Duplicate entries, unreadable tickets, and weak status visibility made on-the-ground decisions harder than they needed to be.

Design the entry system as a state machine: define valid transitions, surface status instantly, and support degraded conditions without losing integrity.

• Single source of truth for ticket state: issued → scanned → admitted, with explicit invalid states.
• Fast scan loop: minimal UI, large status feedback, and one-action resolution paths.
• Degraded-mode handling: caching + retry strategy so entry remains usable with weak connectivity.
• Audit trail: every scan produces a record that can be reconciled after the rush.

Entry speed comes from removing decisions, not adding features. The best check-in UI is the one that prevents thinking.

• Shorter queues from faster, more consistent validation.
• Fewer access disputes because ticket state is clear and provable.
• Smoother handoffs between staff due to a shared, visible system state.