Interview Tomorrow? Prep in 15 minutes

If your interview is tomorrow, stop reading and start rehearsing. In 15 minutes you can do three things that actually change the outcome: say your opening answer out loud once, have one story ready for the most likely behavioural question, and check your camera and microphone. Everything else you’re planning to do tonight is recognition, not retrieval — and only one of those gets tested.

(To be clear, this is about preparing in 15 minutes — not what to do in the 15 minutes before you dial in. That’s a different problem, and it’s answered at the bottom.)

The thing everyone does the night before, and why it doesn’t work

You’ve got the tab open. Maybe eleven tabs. The company’s About page, their LinkedIn, a Glassdoor thread from 2023, a list of 50 Most Common Interview Questions, and somewhere in there the job ad you applied to six weeks ago and haven’t read since.

You’ll read all of it. You’ll feel productive. And tomorrow, forty seconds into “so, tell me about yourself”, none of it will come out.

Reading builds recognition. Interviews test retrieval. They’re not the same skill, and you’ve spent the whole evening training the wrong one.— Lee Li

I looked at what the top-ranking last-minute prep guides tell you to do. Review the job description. Research the company. Identify your key examples. Prepare responses. Prepare questions to ask. All sensible. All of it reading and writing.

Not one of them tells you to open your mouth.

The 15 minutes, in order

Set a timer. Genuinely — the timer is doing real work here, because the failure mode tonight is spending ninety minutes on the first item.

Minutes 0–3 — Read the ad like it’s the scorecard, because it is

Pull up the job ad. Not the company site. The ad.

Find the top three requirements — they’re near the top for a reason — and for each one, name a specific thing you’ve done. Not a claim about yourself. A thing that happened, with a when and a what.

Three lines. That’s the whole exercise. Whoever wrote that ad wrote it before they’d ever met you, and they’ll be marking against it.

Minutes 3–6 — Get one opinion, not twenty facts

Now the company. You’re not going to know their business tomorrow, so stop trying.

Open the product, or their public work, and find one specific thing you’d change. One. A flow that made you hesitate, a decision you’d have made differently, a gap you noticed.

“I use it every day” isn’t an answer — everyone says it and it’s usually a lie. A real, slightly critical observation does more for you in ten seconds than a memorised founding date. It also survives the follow-up question, which memorised facts never do.

Minutes 6–11 — Say the first ninety seconds out loud

This is the half of the fifteen that matters. If you skip everything else, don’t skip this.

“Tell me about yourself” is the one question you’re guaranteed to get. It sets the frame for every answer after it. And it’s the only answer worth knowing close to word for word.

So say it. Out loud. In the room you’re in, right now, with nobody there.

It’ll feel ridiculous. It’ll also be the first time your brain has to actually retrieve the words instead of nodding along to them — and you’ll discover within about eleven seconds that the version in your head had no ending.

Then do it once more. The second run is always better. Always.

While you’re there, pick one story for the most likely behavioural question — a thing that went wrong and what you did about it — and say the first two sentences of that one too.

Minutes 11–13 — Two questions, about the work

Write two questions you’d actually want answered. Not “what’s the culture like”.

• What breaks most often.
• What the last person in this role found hardest.
• What’s on fire in the first three months.

Questions about the real work read as interest. Questions answered on the careers page read as homework you didn’t do.

Minutes 13–15 — Check the camera and the mic

Your first round is a video call. Almost all of them are now. And every prep guide I read treats the call itself as logistics rather than preparation — one line about testing your tech, buried at hour nineteen.

• Are you backlit? If the brightest thing in the room is behind you, the camera exposes for the window and you become a silhouette. Nobody will tell you. They’ll just find you slightly harder to warm to. Move the light so it’s behind your screen, facing you.
• Does the mic actually pick you up? Connected and working are different things. A hardware mute switch on a headset cable, or the browser quietly using the laptop mic while you talk into your headphones, and you’re the candidate who kept cutting out.

Same room, same network, same time of day as tomorrow. Grainy and dark is a fixable problem that reads as an unfixable one.

The one thing on that list you can’t do by reading

Look back at the fifteen minutes. Four of the five blocks are things you can do alone, silently, with a notes app.

Minutes 6 to 11 aren’t. And they’re the ones that decide it.

Because saying your answer out loud in an empty room gets you about seventy per cent of the way. What it can’t give you is the part that actually goes wrong tomorrow: someone interrupting you on your third sentence.

That’s the moment prep falls apart. Not the question — the follow-up. “You said the team pushed back. On what, specifically?” And the story you rehearsed cleanly for ninety seconds has no branch for that, because you rehearsed a monologue and you’re about to have a conversation.

So we built the thing that pushes back

That’s what The Underdog is, and I’ll be straightforward since you’re here the night before.

It’s a practice room. You talk — out loud, in real time — with an AI playing the interviewer. It asks, you answer, and then it follows up on what you actually said, the way a person does. When you finish, you get a report on what worked and what didn’t.

Three interviewers, because real ones vary. Practising against one rhythm teaches you that rhythm. Practising against three teaches you to think.

The feedback follows one rule: one biggest strength, one specific thing to fix. Not a score out of a hundred, not a red bar. You’re doing this the night before an interview — you need to walk away steadier than you arrived, with one thing to work on. Being graded by a black box on your tone with no idea of the rubric is the genuinely unpleasant part of where this industry’s going, and we’re not adding to it.

While we’re being honest: the AI round is coming for you too

Quick story, because it’s relevant to what you might walk into tomorrow.

I got a real interview invite a while back from a legitimate company. “AI interview, optional, takes 10 minutes.” Booked it out of curiosity.

The second the voice started I knew what was happening — I build these, and I recognised the voice provider on the first sentence. And it was rough. It just machine-gunned questions. No pauses. No reactions. No “tell me more”. Question, answer, next question, next question. The whole time I knew I was being transcribed, summarised and scored, on criteria I was never shown.

It felt dystopian for a second, honestly.

AI interviewing is going to be normal — that ship has sailed, and arguing about whether it should be is a waste of an evening you don’t have. But talking to an AI is not the same as talking to a human, and most candidates prepare for one and walk into the other. The gap isn’t the technology. The gap is that almost nobody is practising for the thing they’ll actually face.

What not to do tonight

• Don’t learn anything new. After about 9pm the marginal value of another article is roughly zero, and the marginal value of sleep is high. Cramming makes you sound rehearsed and brittle, which is worse than sounding unprepared.
• Don’t rewrite your CV. They’ve read it. It got you the interview.
• Don’t read fifty common questions. You’ll recognise all fifty tomorrow and be able to answer none of them. Two answered out loud beats fifty skimmed.
• Don’t skip sleep for prep. Sleep is a performance input, not a luxury. It’s also the first thing people trade away for preparation that won’t survive the first question.

FAQ

Is one day enough to prepare for an interview?

Yes, if you spend it rehearsing rather than reading. A day is more than enough to have your opening answer, three or four reusable stories, and your equipment sorted. It is not enough to learn a new domain, and trying to is how people spend a whole day and arrive with nothing retrievable.

How long should you prepare for an interview?

The common advice is five to ten hours across a week, and that’s reasonable for a senior or highly competitive role. But hours spent reading and hours spent rehearsing are not interchangeable. One hour out loud beats five hours of tabs, and most people have that backwards.

What should I do in the 15 minutes before an interview?

Nothing new. That window is for staying calm, not for learning — anything you read in it is more likely to be misremembered under pressure than to help. Reread your own notes, breathe, check your camera and lighting once more, and stop.

Is it better to cram or sleep the night before?

Sleep. It’s not close. Sleep drives memory retrieval and attention, which are precisely the two things an interview tests. Late cramming trades a real performance input for the feeling of productivity.

Can I practise for an interview by myself?

Partly. Saying your answers out loud alone gets you most of the way and is the single highest-return thing you can do tonight. What you can’t rehearse alone is being interrupted and pushed on your third sentence — and that’s usually where the interview is actually decided.

So: it’s tomorrow, and you’ve got fifteen minutes. Are you going to spend them reading, or are you going to say something out loud?