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> entire cloud platform (they're at maybe 10% of AWS) from scratch, in C

Impressive. Any link to this? I'd love to take a look.

In C++ actually.

Few years back Tencent had three internal teams making Wechat, the GuangZhou based Foxmail team won. Wechat IM protocol is basically a modified version of Microsoft Exchange.

Their public cloud is http://qcloud.com/, I don't think everything they've written on the backend is public however.

It has nothing to do with WeChat. qcloud is developed by TEG (Tech. Engineering Group), and the cloud service for WeChat is developed by WXG (Weixin Group).

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