Roblox Senior Machine Learning Engineer Phone Interview Experience

This is a fresh interview experience from last week. I'd appreciate some points, as I need to look at other companies' interview experiences... The Senior-level MLE interview was an HR reach-out, sche

This is a fresh interview experience from last week. .. The Senior-level MLE interview was an HR reach-out, scheduled for a chat with HR. We discussed task tracing, and they mentioned their reluctance to hire to promote, etc. Since I'm looking to change jobs, I gave it a try. The phone interview lasted 60 minutes: 45 minutes of coding and 15 minutes of ML fundamentals. The coding questions were like a match-3 puzzle. There were two phases. The first phase gave a grid with integers. A match was defined as three or more identical cells horizontally or vertically. The task was to output all match pairs (value, # of match). The output had a specific order: from left to right and top to bottom, outputting all vertical cells first, then horizontally (I'm a little unsure which direction came first). The second phase required converting all matched cells to 0 and dropping them downwards. The ML fundamentals were rapid-fire questions. They asked what loss function is typically used for classification and how to write the formula; how to handle categorical features; and how to handle long-tail behavior in ID-type features, etc. points to read this post, thank you everyone!