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How do you handle expert load balancing in an MoE model? What happens if 90% of tokens route to 10% of experts?

The MoE question frontier labs use to test whether you see routing as a systems problem, not just a modeling trick. Covers the collapse spiral, auxiliary losses, capacity factors, and what changes at serving time.

Updated Aug 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.

The MoE question frontier labs use to test whether you see routing as a systems problem, not just a modeling trick. Covers the collapse spiral, auxiliary losses, capacity factors, and what changes at serving time.

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Next in this trackYour training run compiles and runs, but the loss is flat. Walk me through your debugging process.Next in this trackHow do you keep a multi-week training run alive across hardware failures and stragglers?Next in this trackWhat experience do you have with ML infrastructure, including distributed GPU clusters?
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