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Route each request to a cheap 7B or expensive 70B model to maximize satisfaction minus cost. Design the online router.

A static threshold on prompt length leaves money on the table both ways. The router that learns is a contextual bandit, and the interview lives in the reward function and the cold-start handling, not the algorithm name.

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

A static threshold on prompt length leaves money on the table both ways. The router that learns is a contextual bandit, and the interview lives in the reward function and the cold-start handling, not the algorithm name.

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