System Design

Design a system for real-time processing of user behavior data.

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2 answers published. Last candidate submission on Jul 9 2026, 2:06pm PDT. Interview question asked to Site Reliability Engineers, Machine Learning Engineers, Technical Program Managers and other roles interviewing at DoorDash, Optimizely, Firstcry and other companies. Original question asked: Design a system for real-time processing of user behavior data.. Question last reported by a candidate interviewing at Helpling for a Site Reliability Engineer interview on Jul 24 2026, 6:44am PDT.