System Design

Build a multi-feature messaging app like WhatsApp.

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1 answer published. Last candidate submission on Apr 28 2026, 11:13pm PDT. Interview question asked to ML Engineering Managers, Production Engineers, Technical Program Managers and other roles interviewing at BuzzFeed, WeWork, C3.ai and other companies. Original question asked: Build a multi-feature messaging app like WhatsApp.. Question last reported by a candidate interviewing at NVIDIA for an Engineering Manager interview on Jul 26 2026, 1:49pm PDT.