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High-signal articles on system design, algorithms, career strategy, and engineering craft. Written by engineers who've been there.
Learn how to solve the Longest Common Prefix problem the way interviewers expect — column-by-column thinking, clean code, and zero panic.
Learn how to design a blob storage system like S3 in interviews — covering partitioning, metadata separation, replication, and the 10 mistakes that cost candidates the offer.
Master the 3Sum problem with Sort + Two Pointers, avoid the duplicate-skipping traps that trip up most candidates, and learn the pattern that unlocks a whole class of interview questions.
Learn how to solve the rotated sorted array problem in O(log n) — including what interviewers really look for, common mistakes that cost candidates the offer, and exactly how to talk through it.
Learn how to crack the Next Permutation problem in interviews — from building the right intuition to avoiding the exact mistakes most candidates make under pressure.
Most candidates flatten everything into a heap and call it done. Here's why that costs you the offer — and what the optimal O(N log k) approach looks like.
Most candidates overthink this problem and fall into classic binary search traps. Here's the clean lower_bound/upper_bound approach that interviewers love.
A deep dive into dynamic programming — the pattern that unlocks FAANG-level problem solving. Includes 10 annotated examples with full solutions.