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Design the request router and scheduler for a multi-replica LLM serving cluster.

Round-robin routing wastes a feature that doubles throughput: cache locality. Designing the router means choosing a replica by KV state, not just least-loaded. Here is the two-layer design.

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

Round-robin routing wastes a feature that doubles throughput: cache locality. Designing the router means choosing a replica by KV state, not just least-loaded. Here is the two-layer design.

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UP NEXT ON YOUR JOURNEY

Next in this trackCompare static, dynamic, and continuous batching for LLM serving and state the tradeoffs.Next in this trackHow do you offload the KV cache to CPU or NVMe, and when is it worth the bandwidth hit?Next in this trackYou quantized your serving model to FP8 and throughput doubled. How do you prove accuracy held?

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