What architecture scales best for 1 000+ stores?

Microservices architecture with an event bus keeps transactions under 150 ms at peak.

Can I start monolithic then split later?

Yes, design bounded contexts from day 1 so modules can break away with a minimum amount of effort.

Which payment gateways are easiest to certify for PCI?

Stripe Terminal and Adyen provide pre-certified card readers, reducing PCI scope. Similar benefits exist with Magtek or Worldpay via encrypted payloads from the reader.

How does offline mode prevent data conflicts once the store reconnects?

Use a local write-ahead log and ordered sync with two-phase reconciliation plus policy-based conflict resolution; escalate edge cases to managers.

Which external systems should a modern POS integrate with first, and how to prioritize the API roadmap?

Prioritize revenue-critical APIs: payments, inventory/ERP, and labor tools; then BI/e-commerce; score by ROI, effort, and vendor stability.

Which AI feature pays off fastest?

AI demand forecasting typically reaches ROI in 3 months through shrink reduction.

Do we need GPUs in every store for AI features?

Usually no; run models in the cloud and deliver results to devices. Edge GPUs only for heavy local CV use cases.

How much does it cost to develop custom POS software?

MVPs can start around $75,000–$100,000; enterprise-grade systems $130,000–$300,000+. Estimates depend on scope and integrations.

How long does it take to develop a POS system?

Plan 6–12 months for a first production release, depending on functional and non-functional requirements and compliance.

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