ZoomInfo·Backend Engineer

ZoomInfo Backend Engineer interview experience

No offer

Hard

Positive

Ra`anannaPosted Nov 2025 · Candidate report, summarized by Dataford

I started with an HR phone call, then moved into a team-lead interview that leaned on LeetCode-style coding plus questions about JavaScript promises.

After that, I had an architect-level system design interview.

The system design prompt was a notifications service for a digital book library. The core requirement was that users could opt into notifications for books they wanted to borrow, and then trigger notifications inside the app and by email when the book was returned—essentially coordinating the “borrow/return” lifecycle with per-book notification subscriptions.

It was a difficult round because it forced me to think through how events would flow and how users would get notified across channels. I left with the feeling that the

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