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What? I thought whatsapp was pretty renowned for doing their development in erlang with a very small core of engineers (18?).

This article started that rumour due to an error: https://elpais.com/tecnologia/2012/07/03/actualidad/13413401...

Towards the end, they have clarification that states: "Technological development is mainly done at the WhatsApp headquarters in Mountain View and not in Russia as the information suggests. There the company maintains a 'small technical team'."

Thank you, I stand corrected.

They've had development in the engineering department somewhere in Silicon Valley, no?

In Mountain View, just off Castro street, AFAIK. Their name isn't even on the building. Super low-key. An external shot of the building was used in the show Silicon Valley as a stand-in for the Pied Pier office in season 2 or 3 (where Jack Barker is the CEO)