Going deeper on canary and blue-green: how do you actually shift traffic and decide to ramp?
Saying 'route 5% to the canary' is the easy part. What matters is how you split traffic deterministically, gather enough signal to decide, and ramp on evidence rather than vibes. Here is the mechanics layer.
Updated Sep 2026 · Grounded in real GenAI, LLM, and AI/ML engineering interview loops and written to a senior-engineer editorial bar.
Saying 'route 5% to the canary' is the easy part. What matters is how you split traffic deterministically, gather enough signal to decide, and ramp on evidence rather than vibes. Here is the mechanics layer.
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.
