Our code is on GitHub here: https://github.com/Sovereign-Engineering/obscuravpn-client

We're currently using Mullvad as our exit node – all of your traffic is encrypted to their pubkeys, so Obscura's servers can't see your traffic at all! https://mullvad.net/en/servers

We're actually working on a new version of the website that'll explain all of this in more detail. Stay tuned!