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Building WhatsApp with Jean Lee

Employee #19 at WhatsApp reveals how 55 engineers scaled to 900M users before the $19B Facebook exit.

Reporting by Pragmatic Engineer 1 min brief
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The KeyNews take

Why it matters

Early WhatsApp engineer shares tactical insights on building massive scale with minimal resources - a blueprint for AI-era startups facing similar engineering efficiency challenges.

The key facts

4 to know

  1. Employee #19 at WhatsApp

  2. Scaled to 900M+ users

  3. $19B Facebook acquisition

  4. Tiny engineering team of ~55 people

Go to the source

Pragmatic Engineernewsletter.pragmaticengineer.com

Publisher excerpt: Jean Lee, engineer #19 at WhatsApp, on scaling the app with a tiny team, the Facebook acquisition, and what it reveals about the future of engineering.
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