Mock Q packs (hotspots)

~9 min read

🎯 Interview frequent

Why it matters

Reading the spine and answering out loud are different skills. Founder interviews are short, interruptible, and allergic to a memorized script. This page is the drill: a YC-style pack and an early-VC pack, with the shape of a good answer and a pointer to the page that holds the substance. Run it with a cofounder or a friend who is willing to cut you off.

Core concepts

How to run it. Ten minutes for Pack A. One person asks, and they must interrupt at least three times. Record it. The only debrief that matters: which sentence broke (jargon, no user, a number you couldn’t define, an answer longer than the question deserved). Fix that sentence and run it again. Don’t add slides.
Pack B is thirty minutes. Two minutes of narrative, then questions. The interviewer should ask for a definition and a customer by name or context. Debrief the same way, plus: did the ask land on a milestone?
Answer shape, every time. Plain sentence. Past-tense fact. Ugly qualifier, said by you. Stop. The content lives in the earlier topics. If you “win” the mock by being charming and vague, the mock failed.
Don’t memorize paragraphs. Memorize the facts (the user, the numbers, the cut, the price, the split) and the order. Partners notice a recited answer, and an interruption destroys it.
Trade places. The person who only asks never hears their own hedges. Both founders should be able to answer. A YC interview can aim the next question at either of you.

Mental model

flowchart TD
  T[Timer on] --> I[they interrupt]
  I --> A[you answer the new question]
  A --> S[stop]
  S --> B["after: which sentence broke"]

Silence while you recall a true number is better than a smooth sentence you have to retract.

Interview questions

Pack A is the YC-style ten minutes. Pack B is the seed-style follow-up. Answer keys are the shape, not a script.

Pack A — What do you do? Answer: Two sentences a non-expert can picture, plus one person in a scene. No category nouns. Full treatment: Product sense and Traps.
Pack A — Who is the user? Tell me about the last one. Answer: Role and context, the last time the problem happened, the workaround, the cost, and what you changed. If you only have friends, say so. Full treatment: Problem clarity.
Pack A — How do you make money, and what’s the number? Answer: Who pays, how much, how often. Then the real traction sentence: absolute level, dates, and the quality label (paid, pilot, LOI). Full treatment: Pricing and Traction.
Pack A — Why you, and why now? Answer: One edge that is a fact, and one change that unlocked the product this year. “We care” and “AI is hot” don’t count. Full treatment: Why this / why now / why you.
Pack A — What are you raising, if anything, and what do you do with it? Who else is on the team? Answer: Amount, milestone, commitment constraint (including school). Equity only if they poke a weird split. Full treatment: Fundraising and Team.
Pack B — Walk the wedge, then the bigger market. What’s unproven? Answer: Bottom-up count for the first buyers, one adjacent step, and an explicit label on the step you have not sold. Full treatment: Market size & wedge.
Pack B — Who do you lose to today, and why doesn’t the incumbent copy you? Answer: Status quo plus a named alternative. One user-visible axis. A structural reason or an honest head start, not a moat you don’t have. Full treatment: Competition.
Pack B — Define the metric. Show a cohort. What did you spend to get them? Answer: Definition, absolutes, cohort, and “founder time” if you didn’t pay for the channel. Recompute the growth rate with the interviewer. Full treatment: Traction and Go-to-market.
Pack B — Two-minute story, then: what has to be true in eighteen months for this round to have been right? Answer: Narrative order, then a milestone a stranger could check. Not a valuation. Full treatment: Fundraising.

Watch

How to Apply and Succeed at Y Combinator by Dalton Caldwell — Y Combinator. What the short interview is for. Watch it before you run Pack A so the interruptions feel normal.
Live Office Hours with Kevin Hale and Dalton Caldwell - Stanford CS183F: Startup School — Stanford Online. Older office hours (2017). Watch for the questioning style: they interrupt, they chase a vague user, they don’t let a pitch run. The companies are dated. The pattern isn’t.