ZipHQ Interview Questions
ZipHQ tends to decide at the screen. Seven of the 10 questions here come from a technical screen, and the format is consistent: build or fix a small working object inside an hour. One hands you an LRU cache that already exists and asks you to find its bugs, which rewards reading the eviction path and the doubly-linked-list updates carefully instead of rewriting from scratch. Another asks for a vending machine, really a state machine over coins, inventory and change-making. A third wants an in-memory database with TTL expiry and version history, so you have to decide whether a read at a past timestamp is a binary search over a version list or something lazier. The pure algorithm questions are graph-shaped: shortest path on an infinite grid, and finding root IDs plus the paths beneath them. Grouping a hand of cards into flushes and straights rounds out the set. Half the set is runnable in the browser console, which suits questions that are graded on working code; written solutions cover 3 of them. None of the 10 is gated.
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Your agent opens a real question, interviews you, and grades you against the model answer.
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