Two contracts in one system: an OTP with a 30-second promise and a sale announcement reaching fifty million phones without burning providers. Priority lanes and double-layer dedup decide the grade.
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Design notifications for a food delivery app. Order updates cannot be late; coupon blasts cannot spam.
Two contracts in one system: an OTP with a 30-second promise and a sale announcement reaching fifty million phones without burning providers. Priority lanes and double-layer dedup decide the grade.
Updated Sep 2026 · Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.
UP NEXT ON YOUR JOURNEY
Next in this trackDesign a feature flag service used by 200 services. Why keep ordinary evaluation off the network path?Next in this trackPostgres is out of headroom. How do you choose a shard key, and how do you reshard later without downtime?Next in this trackDesign type-ahead search for a marketplace with fifty million products. It must feel instant.
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