The core CS interviews actually ask about
Almost every interview spends time outside DSA — normalization, deadlock, TCP, the four pillars. It's the part everyone leaves until the week before, forgets, and re-learns for the next company.
311 questions across 32topics, written to survive the follow-up rather than to define the term. Free to read here; inside the app they come back on a spaced-repetition schedule, so you see a card just as you're about to forget it.
OOP
The four pillars, SOLID, and the design questions that follow them — the part of every interview that sounds easy until someone asks why.
8 topics · 73 questions
DBMS
Normalization, ACID, indexes and isolation — the subject interviewers use to find out whether you've only ever written SELECT statements.
8 topics · 81 questions
Operating Systems
Processes, scheduling, deadlock, virtual memory and synchronization — the theory behind every concurrency bug you'll ever write.
8 topics · 80 questions
Computer Networks
The layers, the handshake, congestion control and what actually happens when you type a URL — asked in almost every backend interview.
8 topics · 77 questions
Revision that schedules itself
Reading these once won't hold. In the app each card comes back on an expanding schedule — 1, 3, 7, 21, 60 days — and drops back if you forget it.
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