Saira Khan — Product Designer

AI · Interview PrepConceptSolo Project

A mobile app that helps you practice design interviews on your own. It runs the parts that are hard to rehearse alone like whiteboard challenges, portfolio questions, and app critiques.

Video mockup generated on mockey.ai

My RoleProduct design (solo)

Timeline2026

Output37 screens + design system (Figma)

Tools Used

Claude

Figma

mockey.ai

Mobbin

How do I practice a whiteboard challenge to prep for an interview?

I was interviewing for design roles, and I was bad at the parts you can't rehearse alone. I could talk about my work, but I'd never done a live, timed whiteboard challenge or an app critique with someone firing follow-ups at me.

While researching interview prep tools, I realized there isn't a platform designed specifically for Product Designers.

9:41

RECORDING0:42

BEHAVIORAL · Q3 OF 6

Tell me about a time you shipped something you knew wasn't good enough.

Listening…

CompetitorFocusGap / Opportunity

YYoodliAI communication & interview coachingNo portfolio, critique, or whiteboard practice.FFinal Round AIGeneral AI interview preparationNot Product Design-specific.HHuruGeneral mock interviewsBehavioral only — no design workflows.RRevarta (Product Design Mode)Product Design interview practiceNo portfolio coaching or live critiques.

designcrit is scoped at the underserved 60% — starting with whiteboard and portfolio-critique rounds.

So I designed an AI-powered mobile app.

It interviews you across realistic product design interview rounds — portfolio, critique, and whiteboard — then gives you a result at the end: how you performed, and where you're lacking.

9:41

PORTFOLIO ROUND · IC5 · METAClose

Mixed

The craft is there and the story lands. What's missing is evidence — you never showed me how you knew you were right.

Problem framing

Craft

Tradeoff reasoning

STRONGEST — STEP 2

“The reason determines whether it's returnable at all.”

That's a structural argument for the IA, not a preference. Exactly the register this round rewards.

WEAKEST — STEP 4

You defended the whole design instead of cutting it.

Asked what you'd drop with half the engineering, you argued nothing could go. At IC5 that reads as not prioritising.

PRACTICE THIS NEXT

“Same case study — walk me through the version you'd ship in two weeks.”

9:41

BEHAVIORAL · 18 MINClose

Strong — would advance

Six questions. Across all of them you consistently owned decisions instead of describing circumstances. Outcomes were the soft spot.

Ownership

Structure

Impact & outcomes

STRONGEST — Q3

“We cut the onboarding tour instead.”

You named what you gave up. Most candidates describe the pressure and skip the decision.

WEAKEST — Q5

The outcome stayed vague.

“It went fine” — twice. Interviewers wait for the number, or what you watched.

PRACTICE THIS NEXT

“Retell your Q5 story — open with the metric you moved.”

9:41

THE DEBRIEF WOULD SAY

Mixed — not yet a yes

Two strong rounds, one that would divide the room. Portfolio is the round that gets argued about, and yours gave them nothing to argue with.

RecruiterNot scored

PortfolioMixed

App critiqueStrong

BehavioralStrong

THE PATTERN ACROSS ROUNDS

You're sharp on other people's products and protective of your own. I pushed on Duolingo and you cut it open; I pushed on your case study and you defended it.

PRACTICE THIS NEXT

“Critique your own case study the way you critiqued Duolingo.”

9:41

WHITEBOARD · IC5 · METAClose

Strong — would advance

You asked the question that unlocked the brief, then designed for the constraint. You ran about six minutes long.

Problem framing

Product thinking

Tradeoff reasoning

STRONGEST — STEP 2

“Does everyone at the table have the app?”

Most candidates start sketching. That question changed the whole problem, and you asked it first.

WEAKEST — STEP 4

You defended the organiser model instead of testing it.

Pushed on “what if nobody volunteers,” you restated the flow instead of trying a version without one.

PRACTICE THIS NEXT

“Same brief — sketch it with no organiser, in ten minutes.”

Interview rounds

I gave the option for the user to practice individual rounds according to their time availability

Mode select — the real screen where you choose which round to practice

The actual mode-select screen — pick a round to see where it opens.

Whiteboard, start to finish

The whiteboard is one of the most important rounds, but it's also the hardest to practice alone — you need someone to hand you a real brief, push back while you think out loud, and see how you handle it live.