Tier 3 — Question Vault
52 questions.
52 questions.
Pay once. Use forever.
The complete walkthrough library — every named question asked at Amazon, Google, Meta, Stripe, Uber, Netflix, and their tier.
$299
one-time · lifetime updates
Paid subscribers: $249 · India/SEA: ₹9,999
52Full walkthroughs
52Drill cards (PDF)
6Framework cheatsheets
∞Lifetime updates
10 archetypes — 52 questions, 10 underlying patterns
Counters & Rate Limits
0 questions
File Sync & Storage
0 questions
Infrastructure & Platform
0 questions
Marketplace & Matching
0 questions
Money Movement
0 questions
Real-time Messaging
0 questions
Search & Ranking
0 questions
Social Feed
0 questions
Specialized Systems
0 questions
Streaming Media
0 questions
Sample walkthroughs in the Vault
10 of 52 shown
| # | Question | Archetype | Level | Probe |
|---|---|---|---|---|
| 01 | Design a URL Shortener Twitter, TinyURL, Bitly | Infrastructure | L4–L6 | Distributed ID at scale |
| 02 | Design Stripe Payments Stripe, PayPal, Robinhood | Money | L5–L7 | Idempotency keys |
| 03 | Design Twitter Timeline Twitter, Meta, LinkedIn | Social Feed | L4–L7 | Fanout-on-write vs read |
| 04 | Design Uber Dispatch Uber, Lyft, DoorDash | Marketplace | L4–L7 | Geohashing vs quadtree |
| 05 | Design WhatsApp Meta, Apple, Slack | Messaging | L4–L7 | Delivery semantics |
Also included: The Senior+ Playbook
How interviewers score the design round. Scoping discipline. Reading the interviewer. What changes at L4, L5, L6, and L7.
7-day refund
Notion workspace
PDF drill cards
$299