Implementing the Raft distributed consensus protocol in Go (notes.eatonphil.com)

If you are okay with writing Java, the dslabs framework is great as well. The penultimate project around fault tolerance can be done in Raft.

The MIT course for Raft (with the lectures on YouTube) was great to learn for me: http://nil.lcs.mit.edu/6.824/2020/labs/lab-raft.html