WhatsApp technical stack? How are their system able to handle so much traffic?


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Does anyone know the stack that Whatsapp is built on? They process billions of sms messages a day and it would be interesting to study how they scale that?

Technology Scaling Whatsapp

asked Feb 28 '14 at 15:24
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Jose Jackson
5 points

1 Answer


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Their stack:

  • Erlang
  • FreeBSD
  • Yaws, lighttpd
  • PHP
  • Custom patches to BEAM (BEAM is like Java’s JVM, but for Erlang)
  • Custom XMPP

High Scalability wrote a post about WhatsApp's architecture.

answered Feb 28 '14 at 15:40
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Patricia Wright
638 points

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Technology Scaling Whatsapp