Status is developing an client in Nim for the next version of Ethereum, a distributed computing platform - we've come to the point where an initial release will be made, and we're looking for security-minded people to help harden it.
https://our.status.im/nimbus-eth2-0-security-audit-request-for-proposal/
In short, the client we're building computes a distributed state and incorporates networking, cryptography and economy to come to a shared understanding of the current state of its world.
There are multiple attack surfaces: the Nim compiler / language, the networking code, the cryptography (both symmetric and asymmetric), the implementation of the Ethereum specification (which itself has been audited), and finally the user experience.
If you're a security auditor, or know any, head to that article to find out more!