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Design a Web Crawler — Walkthrough
Archetype: Search & Ranking · Asked at: Google, Bing, Common Crawl
4 hrs ago
2
The Silent Step 7 — the move that turns Hire into Strong Hire
After the trade-offs section, before the interviewer wraps up, there is a 2-minute move that upgrades a Hire to a Strong Hire more reliably than…
Sep 13
5
2
Model Registry & Versioning: Managing the Lifecycle of ML Models
A model registry sounds like a fancy word for a spreadsheet, and for the first six months at most companies, that’s exactly what it is.
Sep 12
3
3
Design a Payment Fraud Detection System
Archetype: Money Movement · Asked at: Stripe, Visa, PayPal, Robinhood
Sep 8
22
7
The Most-Asked Question at Each FAANG
After building the 52-question bank, I went back and tagged each question by which company most commonly asks it and at what frequency.
Sep 6
10
1
3
Feature Stores Explained: Storing and Serving ML Features in Real-Time
Section 9: AI & LLM Infrastructure
Sep 4
4
3
Notification Service — Model Answer
Week 1 Take-Home: Reference solution released in Week 2
Sep 1
10
5
August 2026
How to Prepare for L6 When You're Currently L5
Most advice about levelling up from L5 to L6 sounds like this: go broader, go deeper, show more impact, lead across teams.
Aug 30
12
5
Design TikTok For You Feed — Walkthrough
The probe
Aug 25
3
7
SQL vs NoSQL: How to Choose Without Hedging
“It depends on the use case.”
Aug 23
13
4
Building an AI Agent Framework: Memory, Tools, and Planning Modules
The Dispatch Problem
Aug 21
7
3
Design Airbnb Booking System — Walkthrough
The probe
Aug 18
3
6
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