Design a multi-region, highly available LLM serving platform with failover and bounded cost.
GPUs are scarce and costly, so multi-region HA for LLMs is not simply web-app HA with bigger machines. Capacity, routing, and failover all bend around the GPU constraint. Here is the design.
Updated Sep 2026 · Grounded in real GenAI, LLM, and AI/ML engineering interview loops and written to a senior-engineer editorial bar.
GPUs are scarce and costly, so multi-region HA for LLMs is not simply web-app HA with bigger machines. Capacity, routing, and failover all bend around the GPU constraint. Here is the design.
Lead with where the obvious approach breaks, because that is the judgment they are screening for — most candidates jump straight to the happy path and lose the room.
Then walk the failure back through the pipeline in order, naming the one metric the customer's exec sponsor actually cares about before you propose the fix.
