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Toast System Design Interview: Complete Preparation Guide

Prepare for Toast's system design interview with tips on restaurant POS systems, order management, payment processing, and offline-first design.

22 minUpdated Apr 25, 2026
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Interview format

4 rounds total.

System Design50 min

Design a restaurant technology or payments system. Emphasis on offline-first architecture, real-time order management, and POS reliability.

Coding 150 min

Algorithmic problem. Toast primarily uses Java and Kotlin. Expect clean, object-oriented solutions with good error handling.

Coding 250 min

Second coding round, often practical — may involve designing a data model or implementing business logic for restaurant operations.

Behavioral / Culture45 min

Assesses alignment with Toast's values: being customer-obsessed, having a bias for action, and operating as One Toast.

Commonly asked systems

Design a restaurant point-of-sale system with offline supportDesign an online ordering and delivery management platformDesign a kitchen display system for order routingDesign a payment processing system for high-volume restaurantsDesign a menu management and pricing systemDesign a real-time table reservation and waitlist systemDesign a restaurant analytics and reporting dashboardDesign a tip distribution and payroll integration system

What they evaluate

Offline-First DesignHigh

Restaurants must keep operating without internet. Toast evaluates your ability to design systems that work offline and sync reliably when connectivity returns.

Real-World ReliabilityHigh

POS systems cannot crash during a dinner rush. Can you design for extreme reliability in a hardware-constrained environment?

Domain UnderstandingMedium-High

Do you understand restaurant operations? Order flow, kitchen routing, payments, tips, and reporting are all interconnected.

ScalabilityMedium-High

Toast serves tens of thousands of restaurants. Can you design a multi-tenant platform that scales while maintaining per-restaurant performance?

Pragmatic Problem SolvingMedium

Toast values practical solutions. Restaurant staff are not engineers — your system must be robust under messy, real-world conditions.

Tips

  • ▸Study offline-first architecture patterns: local storage, conflict resolution, eventual consistency, and sync protocols
  • ▸Understand the restaurant order flow: order entry, kitchen routing, preparation, serving, payment, and tip
  • ▸Know how POS payment processing works: EMV chip, contactless NFC, magnetic stripe fallback, and offline authorization
  • ▸Think about multi-tenant architecture for SaaS — each restaurant is a tenant with their own menu, pricing, and configuration
  • ▸Kitchen display systems have real-time requirements — how do you route orders to the right station with priority?
  • ▸Study conflict resolution for offline syncing — what happens when two servers modify the same order while offline?
  • ▸Toast integrates with many third-party delivery services (DoorDash, Uber Eats) — think about integration design

Preparation roadmap

Week 1-2Restaurant Tech Fundamentals
  • ·Study how POS systems work in restaurant environments
  • ·Learn offline-first architecture patterns: CRDTs, operational transforms, sync queues
  • ·Understand payment processing in physical retail: EMV, NFC, offline authorization
  • ·Review Toast's product suite: POS, online ordering, payroll, marketing
Week 3-4Core POS Systems
  • ·Design an offline-capable POS system with reliable syncing
  • ·Design a kitchen display and order routing system
  • ·Design a payment processing pipeline with offline fallback
  • ·Study multi-tenant SaaS architecture for restaurant platforms
Week 5-6Platform & Integrations
  • ·Design an online ordering system with third-party delivery integration
  • ·Design a real-time reporting and analytics pipeline for restaurant operations
  • ·Study data synchronization and conflict resolution strategies
  • ·Review PCI compliance for physical payment terminals
Week 7-8Mock Interviews & Polish
  • ·Do at least 3 mock system design interviews with restaurant scenarios
  • ·Practice designing for non-technical users — restaurant staff need bulletproof UX
  • ·Prepare behavioral stories about customer obsession and shipping fast
  • ·Review edge cases: what happens when the POS loses power during a payment?
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