Toast Interview Guide (2026): Restaurant Tech Engineering

Updated July 12, 2026 · techinterview.org

Toast is the dominant US restaurant POS platform — over 100K restaurants, hardware and SaaS combined. The interview values offline-first thinking and payments expertise. They specifically hire engineers who can reason about hardware constraints, network unreliability, and the chaos of a Friday-night dinner rush.

Process

Recruiter screen → 45-minute coding phone (DSA-flavored but practical) → onsite virtual: 2 coding, 1 system design, 1 behavioral, 1 hiring manager. Some roles add a domain round (payments, hardware integration, or Android for KDS team). Cycle: 3–4 weeks.

What they actually ask

• Design an offline-capable POS that syncs orders when network returns. Focus on how a terminal keeps taking orders and payments with the network down, then reconciles on reconnect. Interviewers probe your conflict-resolution strategy — what happens when two terminals edit the same open check, and how you avoid double-charging on replay.
• Design payment processing with PCI compliance and tokenization. Know why card data never touches your servers in the clear — the terminal or gateway tokenizes it, and you store the token, not the card number. Expect follow-ups on scope reduction, the settlement flow from authorization to capture, and how you handle refunds and disputes.
• Design online ordering with real-time menu sync across hundreds of locations. The hard part is propagating a menu or price change to every location’s devices fast without hammering a central service. Talk through push vs. pull, per-location caching, and what happens to in-flight carts when an item goes 86’d mid-order.
• Coding: queue/stack/heap problems, often framed around order processing or kitchen display. Expect a priority queue for ticket routing, a stack for order undo, or a heap for the next N tickets by prep time. Practice mapping a restaurant-flavored prompt to the right structure fast and stating its time complexity out loud.
• Concurrency: handle simultaneous orders from POS, online, and third-party (DoorDash) channels. The core question is how three channels write to the same check without corrupting it — locking, optimistic concurrency, or an event log. Be ready to reason about race conditions on inventory (last item sold twice) and idempotency when a channel retries.

Levels and comp (2026)

• SE I: $145K–$175K total. Entry level for new grads and early-career engineers; you’re judged mostly on coding fundamentals and whether you can ship well-scoped tasks with guidance.
• SE II: $190K–$240K. The bar shifts to owning features end to end and handling ambiguity without hand-holding; most external hires with a few years of experience land here.
• Senior SE: $260K–$340K. Expect a real system design round plus questions on mentoring and cross-team impact, not just clean code. These bands are wide, and where you land inside them usually comes down to negotiation.
• Staff: $360K–$470K. Interviews probe technical strategy and org-wide influence; you’ll be asked to defend architectural bets and explain how you drive alignment across teams.

Prep priorities

1. Read up on offline-first sync (CRDTs, vector clocks, last-write-wins). Be able to explain the trade-off — last-write-wins is simple but silently drops data, while CRDTs and vector clocks preserve concurrent edits at the cost of complexity. Interviewers want to hear you pick the right one for a POS, not recite all three.
2. Understand payment terminology: tokenization, settlement, chargebacks, EMV. Don’t just define the terms — know the flow they sit in, from an EMV chip read through authorization, capture, and settlement to a chargeback that can land weeks later. Fluency here signals you understand where Toast makes its money.
3. Toast is mission-driven — talking about restaurant industry pain points wins points

Frequently Asked Questions

Does Toast hire mobile engineers?

Yes. The KDS (Kitchen Display System) and Toast Go handheld run Android, so dedicated Android teams interview separately.

How much does Toast pay vs FAANG?

Base is competitive but equity is smaller post-IPO. Total comp lands ~70–80% of FAANG at the same level.

What is the dress code for the interview?

Casual. Toast culture is relaxed. Show up in something you would wear to a coffee shop.