Nimble Robotics Software Engineer interview experience

No offer

Hard

Negative

Candidate report, summarized by Dataford

My interview centered on a systems/algorithms discussion: a variant of an LRU cache with TTL.

The interviewer emphasized that I needed to prioritize cleaning expired items when the cache was full, but still keep O(1) time complexity. We dug into how many implementations only clean expired items that happen to sit contiguously at the tail, while expired entries in the middle can cause complexity issues.

I talked through several strategies for active expiration, including the idea of using a min-heap, something like a multimap to help track times, a timing wheel, and even a background thread for periodic scanning. Even though I had answers, I felt uncertain about what the interviewer

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