Design Tinder
PremiumProduct architectureEasy
- Swipe deck
- Geospatial index
- Mutual match
Quick answer
This product architecture interview question asks you to design Tinder. 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 Tinder, a dating app where people see a deck of nearby profiles, swipe right to like or left to pass, and get a match when two people like each other. The hard parts are building a fresh deck of nearby people who fit both users' preferences, never showing a profile twice, and creating each match exactly once.
What must the system do?
- Swipe deck: The app shows nearby profiles that fit the user's preferences and whose preferences the user fits.
- Match: When two users have liked each other, both get a match notification and a chat opens.
How well must it do it?
- Ready deck: The next profiles are loaded before the user reaches the end, and a deck fetch takes under 300 ms.
- One match per pair: If both people like each other, exactly one match is created, even when they swipe at the same moment.
What scale should you design for?
Use these numbers in your estimates.
The scale numbers unlock with this questionUnlock
Key concepts
- Swipe deck
- Geospatial index
- Mutual match
- Geohash
- Deduplication
- Push notifications
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 Tinder and explain your choices the way you would in an interview.
- Is this question asked at entry level?
- It is marked Easy, so it suits engineers who are new to product architecture interviews. It is also a good warm-up before harder questions.
- 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