Zoox·Data Scientist·Technical Phone Screen
Apr 2026
Zoox data scientist interview with a rapid-fire brainteaser round covering estimation, probability, geometry, and a classic physics puzzle. The pace was relentless and the questions jumped around a lot, but the interviewers seemed more interested in how you think than whether you land the exact number.
- A floor is 15 ft by 20 ft and you're covering it with square tiles that each have an area of 1 square yard. About how many tiles do you need?
- An account starts with $1,000 and doubles every year. How much is in it after 20 years?
- Using back-of-the-envelope reasoning, estimate the distance from Earth to the Moon. State your assumptions.
- A boat floats in a lake with stones in it. You throw the stones overboard into the lake. Does the water level rise, fall, or stay the same?
- Each of two boxes contains cards labeled 1, 2, and 3. You draw one card from each box at random. What's the probability that the product of the two cards is even?
- Roughly how many uncompressed 1080p movies fit on a 2 TB hard drive? State your assumptions about frame rate, color depth, movie length, and how you define TB.
- Three squares are nested concentrically, with each inner square formed by connecting the midpoints of the sides of the one around it. If the innermost square has area A, what is the area of the outermost square?
“Units trip you up here if you're not careful.” The rest of the author's notes on Data Scientist interview at Zoox, Technical Phone Screen round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.
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