How we curate every question.
Quality bar, factual review, and continuous improvement.
Deliberate coverage, not random crawling
Every topic has a planned coverage map, an intentional list of sub-concepts that real interviewers test, mapped to the question format that tests each one best. Drafts are written against that map. The result is breadth (every relevant sub-concept is covered) and depth (each one is tested in the most natural format for it).
Every question carries a full content stack
A one-line TL;DR for fast recall, Easy to grasp for intuition, a short brief explanation, beginner / standard / senior answer variants for different interview levels, a revision checklist for night-before review, common mistakes and red flags to avoid, and a deep dive for the concept behind the question. Every section is reviewed before publish.
Factual review
Every published question goes through factual review. We check that formulas typeset correctly, the senior answer cites real tradeoffs (latency, memory, evaluation signals) and not generic “it depends”, and Easy to grasp stays accessible with at most one piece of jargon, glossed inline. Anything ambiguous goes back for a rewrite before it ships.
Continuously improved by you
Every question carries a rating widget: difficulty, quality, and a fair-for-interview toggle. Aggregate ratings surface questions that need editing. A high-difficulty / low-quality signal usually means the wording is unclear, not that the question is hard. A low fairness rating triggers a review for interview relevance. Your votes shape the catalog.