Jean Lee
Former WhatsApp engineer who joined as engineer #19 and helped scale the product to hundreds of millions of users. Later worked at Meta, became an engineering manager, and now shares career and leadership insights publicly.
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Mar 18, 2026 • 1h 11min
Building WhatsApp with Jean Lee
Jean Lee, former WhatsApp engineer #19 who later became a Meta engineering manager, shares how a tiny team scaled messaging to hundreds of millions. She talks about eight native clients, Erlang, and a culture of extreme simplicity. There’s also the inside story of the Facebook acquisition, the jump into management, performance review dynamics, and why lean teams still matter in the age of AI.
