Layer 3 · Go deeper · 6 min
Go deeper
Size it, build it, then make the calls an interviewer will push you on.
Back of the envelope
Size it up
Tap through each step of the arithmetic.
How fast must you build a library of about 20 designs?
Build-up · 5 steps
Where each signal gets its evidence
The five signals aren’t collected evenly. Walk the round phase by phase and watch the evidence land.
Step 1 of 5
Scope
Questions, requirements on the board, two or three numbers and an out-of-scope list. That’s the evidence for problem navigation.
3 interview moments
You’re the candidate
The interviewer pushes on the hard parts. Pick an approach and see how it holds up.
Deep dive 1 of 3
Interviewer
““Design a food-delivery app.” What do you do in the first five minutes?”
Your move. Pick an approach:
Deep dive 2 of 3
Interviewer
“The interviewer mentions a technology you’ve never used. What do you do?”
Your move. Pick an approach:
Deep dive 3 of 3
Interviewer
“You’re interviewing for senior. Twenty-five minutes in, nobody has mentioned failure. What do you do?”
Your move. Pick an approach: