It's written in Java using the Dropwizard framework. I've skimmed through the co... | Hacker News

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		01acheru on Jan 15, 2021 \| parent \| context \| favorite \| on: Signal is having technical difficulties It's written in Java using the Dropwizard framework. I've skimmed through the code and found references to Protobuf, GCM and Redis It's open source so you can check the code here: https://github.com/signalapp/Signal-Server

mshroyer on Jan 16, 2021 [–]

It looks like mostly blocking code... I wonder if that's hampering their ability to scale.

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