How would you architect personalized email and coupon delivery at scale?
This tests decoupled rendering and atomic coupon reservation. A strong answer uses template rendering, atomic coupon reservation, an idempotent queue, and batched ESP delivery. Red flag: generating coupons during SMTP without reservation risks overspend.
This tests separating content rendering from compute, guaranteeing idempotent coupon delivery, and scaling through an ESP without data loss. A strong answer covers four layers: a template engine resolving user data into HTML/text; a coupon service atomically reserving codes; an idempotent job queue retrying failed sends without double-spending; and a delivery layer with rate limiting and bounce handling. A red flag is generating codes inline during SMTP without reservation, risking duplicates, overspend, and compliance issues.
Read the original → advertstar.net
- #system design
- #scalability
- #idempotency
- #coupons
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