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Design Memory Allocator
Also known as: Design Memory Allocator (Custom)
This one rewards writing clear, step-by-step logic you can trust. Interviewers love it because it reveals your step-by-step correctness and your edge-case discipline. The classic mistake is a tiny ordering detail; write it like you're debugging a state machine.
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Low-Level Design Interview Questions
Low-level design problems test whether you can model a small API, preserve invariants, and choose storage that matches the required operations. Expect recurring shapes like rate limiters, hit counters, tic-tac-toe, file systems, and autocomplete.
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Low-Level Design Interview Questions gives you a useful next rep while you are still on your phone.