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Architecture Or What is the technology stack behind WhatsApp

BACKEND
  1. OS: freeBSD
  2. Server : yaws
  3. Server application : custom ejabberd
  4. Language : erlang
  5. Technology : custom XMPP
  6. PHP somewhere in middle for non-stream server-user transactions.(at least website uses WordPress :) )
  7. Database : mnesia
  8. Encryption: RC4



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