How 30 Engineers Built WhatsApp for Hundreds of Millions
Published on 18.03.2026
Building WhatsApp with Jean Lee
TLDR: Engineer #19 at WhatsApp, Jean Lee, shares the inside story of how 30 engineers served 450 million users with no Scrum, no code reviews after onboarding, and almost zero formal processes — and why that tiny, experienced team crushed competitors with thousands of engineers.
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