Phenom Software Engineer interview experience

I had a first DSA round with two questions, including an array-style sliding-window problem, and I finished both in about half an hour. The second technical round built on that with another DSA question—spiral matrix traversal—and then turned toward a practical design scenario.

In the design discussion, I had to explain how I would build an online game using Mongo and then scale it out to something like one hundred thousand users. I remember focusing on data shape decisions like having a read-only copy and handling the core scaling considerations without getting lost in too much extra