2 answers published. Last candidate submission on Aug 26 2026, 4:10pm PDT. Interview question asked to ML Engineering Managers, Engineering Managers, Technical Program Managers and other roles interviewing at Blinkit, Netflix, Instacart and other companies. Original question asked: Design a messaging system like WhatsApp.. Question last reported by a candidate interviewing at GitLab for a Technical Program Manager interview on Aug 22 2026, 8:42am PDT.