Building a POS that survives a busy Saturday

A POS lives or dies at the counter during the rush. Everything else is secondary.

Non-negotiables

• Speed. Keyboard and barcode first, every common action two keystrokes away.
• Offline. The till keeps working when the internet does not, and syncs later.
• Correct stock. Every sale, return and transfer adjusts inventory in real time.
• Trustworthy reports. Day-end totals that reconcile with the cash drawer, every time.

Nice to have

Multi-outlet dashboards, loyalty, and GST-ready invoicing — valuable, but only after the four things above are rock solid.