Design Amazon
PremiumProduct architectureHard
- Product catalog
- Shopping cart
- Inventory reservation
Quick answer
This product architecture interview question asks you to design Amazon. Aim for a design that meets its requirements at the stated scale, then explain its main components, data flow and trade-offs. Interviewers want to see how you scope the problem, size it and defend each choice.
The problem
Design Amazon, an e-commerce marketplace where shoppers find products, add them to a cart and check out. The hard parts are serving a million product page views per second on sale days, never selling stock that does not exist during a flash deal, and charging each order exactly once.
What must the system do?
- Product page: Shows title, images, price, seller, delivery estimate and stock status for any of 350 million products.
- Checkout: Shows the final price, tax and delivery date, reserves stock, authorizes the card and creates the order in one flow.
How well must it do it?
- No overselling: Confirmed orders for an item never exceed its available stock, including during flash deals.
- Exactly-once orders: A retried or double-clicked Place Order never creates two orders or two charges.
What scale should you design for?
Use these numbers in your estimates.
The scale numbers unlock with this questionUnlock
Key concepts
- Product catalog
- Shopping cart
- Inventory reservation
- Checkout saga
- Idempotency keys
- Flash sales
How you’ll practise
- Requirements
- Core entities
- API design
- Client and server flow
- Scale and edge cases
- Wrap-up
Lala, personalized to you, gives a hint when you ask and reviews your design when you are ready.
What do interviewers look for?
In any product architecture design round.
- Clarifies the requirements before drawing anything
- Uses a few numbers that actually change the design
- Draws a clear path from the client to storage
- Picks storage and caching with reasons, not by habit
- Explains what breaks first under load and how to fix it
- States trade-offs openly instead of claiming a perfect design
Questions people ask about this interview question
- Which design type is this question?
- It is a product architecture question. You design Amazon and explain your choices the way you would in an interview.
- Is this question asked at entry level?
- It is marked Hard. It suits engineers preparing for senior interviews, where you are expected to drive the discussion and go deep on trade-offs.
- What should I cover first?
- Start with the requirements: what the system must do, how well it must do it and which numbers change the design. Agree on scope with the interviewer before you design anything.
- Can I practise it for free?
- It is a premium question. Sign up and unlock it once for 10 credits; it then stays unlocked. When you finish, Lala, your personalized AI mentor, can review your design for 30 credits.
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Updated · Written by the SevyDevy team