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How do you serve many fine-tuned model variants efficiently (multi-LoRA serving)?

Hosting one full fine-tuned model per customer scales linearly in GPUs and bankrupts you fast. There is a way to put hundreds of variants on one GPU without giving up batching. The interviewer wants to hear how.

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

Hosting one full fine-tuned model per customer scales linearly in GPUs and bankrupts you fast. There is a way to put hundreds of variants on one GPU without giving up batching. The interviewer wants to hear how.

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