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I wonder if WhatsApp's infrastructure is still built on Erlang. https://www.wired.com/2015/09/whatsapp-serves-900-million-users-50-engineers/ https://www.wired

• gradientdescent 9y ago
  It's impossible for them to migrate away from it today _silently_ The question is "What is their status with their setup today: Want to keep Erlang or migrate to Go/Java/Rust" Anyway... Erlang is considered to be the/a main reason for their success bcs it keeps out the mediocre Java-Developers