RejectedTechnical Screen

Failed the First-Round UnionIterator Question

MongoDBSoftware Engineer · Technical Screen · Sep 2026

First round phone screen. I got asked an Iterator question, and I failed because I didn't practice enough. I'm sharing the question for everyone. Overall I thought the interview experience was pretty good. The interviewer was really nice and gave me hints, and I feel like their company culture is good too, and the work-life balance is good as well. Implement a UnionIterator class that takes two s…

Shared by a candidate · reported Sep 2026. Interview formats change; use it as a guide, not a script.