Design notification and project architecture
DoorDashSoftware Engineer · Technical Screen
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This interview question evaluates requirements, scale assumptions, API/data design, architecture, trade-offs, failure modes, and rollout in a realistic interview setting. A strong answer for Design notification and project architecture states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
Question
Design a scalable Notification System that supports real-time and scheduled messages across multiple channels (email, push, SMS). Detail components, data flow, storage, failure handling, and scaling strategy. Then, draw and explain the end-to-end architecture of one of your past projects, covering services, databases, communication patterns, and answer deep domain-specific follow-up questions.
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