CANDIDATE
You
PROBLEM
Parking Lot
SESSION
37:42
STATUS
ACTIVE
¶03 - Interview Mode
Practice like the clock is always on. Watch it add up.
Most candidates only ever practice untimed - then freeze when the clock starts in a real interview. Interview Mode puts a countdown on the canvas from day one, then tracks every session as a streak, an activity heatmap, and a practice-time graph so the habit builds itself.
5
timer presets
∞
unlimited option
365
day activity calendar
1-tap
pause and resume
§01 - How a session works
Three phases. From blank canvas to logged session.
Pick your duration and step in.
Choose 30, 45, 60, 90 minutes - or practice without a limit. A blank canvas opens with the full editor. Your notes panel slides open beside it. The clock is ready. You're not.
Pick Session Duration
Design under the countdown.
The timer is always visible. You design exactly like in a real interview - blank slate, full editor, all 23 design pattern skeletons available. Pause if you need to, but paused time doesn't count.
37:42
of 45:00 · 7:18 remaining
Session logged. Streak updated.
End the session and everything saves automatically - your streak increments, practice time accumulates, and your activity calendar marks the day. No manual tracking. No logging. The habit builds itself.
Session Complete
+1 Streak45:00
Time used
🔥 13
Day streak
35
Sessions
This week
§02 - Career stats
Analytics that show progress, not just activity.
Tracking that you practiced is table stakes. Interview Mode goes further - it shows whether you're getting faster, where your weak patterns are, and how your personal bests improve over time.
12
CURRENT FORM
day streak
48h
ALL-TIME
total practice time
34
MATCHES PLAYED
sessions completed
365d
ACTIVITY LOG
calendar coverage
↑12%
IMPROVEMENT
Ultimate only
38:41
PERSONAL BEST
fastest session
§03 - Why timed practice matters
The difference between knowing and performing under pressure.
Most engineers who fail LLD rounds know the design patterns. They've studied Observer, Factory, and Strategy. They can describe composition vs aggregation. But when a countdown clock appears and an interviewer is watching, they freeze - because they've only ever practiced in conditions with zero pressure.
Interview Mode is designed to eliminate that gap. By practicing with a real timer, in the same tool you'll use under pressure, you build the procedural memory that lets you draw the design quickly and confidently when it counts. The streak system ensures that memory compounds day over day, not just in the week before the interview.
Pair Interview Mode with the 110+ practice problems and revision notes for a complete preparation workflow.
§04 - Tactics board
A dedicated panel for your thought process.
In real LLD interviews, interviewers care as much about how you think as what you design. The session notes panel gives you a dedicated place to write down your trade-offs, assumptions, constraints, and design decisions as you go - the on-screen equivalent of thinking out loud.
Notes are saved with the session and reviewable afterwards, so you can look back at past sessions and track how your reasoning has evolved.
Assumptions:
- Single building, multiple floors
- Support car, motorcycle, truck
- Hourly billing strategy (can extend)
Design decisions:
- Using Strategy for fee calculation
→ allows adding new pricing models later
- Level owns Spot (composition)
Trade-offs:
- Not handling concurrent reservations yet
FAQ
Questions people ask
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