Roblox Machine Learning Engineer Interview Experience — Onsite Rejected After the Project Deep Dive

Roblox·Machine Learning Engineer·Nov 2026
OnsiteRejectedmedium

Round 1 was ML design, a recommendation system. No problems, it was a relaxed conversation and I got through it easily.

Round 2 was a project deep dive. Over the past few years I moved from ranking to LLM agentic work, so I prepared LLM-related projects. But the two interviewers who showed up both had ranking backgrounds and were probably not very familiar with agentic projects. In the end their feedback was that the main work was data & harness, and that there was no ML depth signal.

Round 3 was the hiring manager behavioral round. It was average, no problems.

My takeaway is to prepare two project deep dives and pick whichever fits the situation. I did not want to prepare a ranking project because I have not worked on ranking in the last few years, the tech stack from back then may be outdated, and I have probably forgotten some of the details.

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Curated and edited by PracHub

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Interview at a glance

Company
Roblox
Role
Machine Learning Engineer
Rounds
Onsite
Outcome
Rejected
Difficulty
medium
Interview date
Nov 2026
Questions from this interview
1 question

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