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Let's say I wanted to prove to a future employer that I had learned how t build a distributed system with a practical example, but my current employer doesn't require a distributed system. How could I go about doing this in a side project?

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Implementing the Raft protocol[1] has been a popular activity over the last couple of years. Amazon's Dynamo paper[2] is also easy enough to grasp to build a prototype of a distributed key/value store.

[1]: https://raft.github.io

[2]: http://www.allthingsdistributed.com/files/amazon-dynamo-sosp...

You should dive into Mesosphere. The resources available are quite robust. With only a tenuous grasp on the larger concepts I was able to architect a system with Mesos + Chronos for job queueing and Marathon for container deployment and moved some of my hobby projects to it. For less than $150 a month or so you could provision 3 primary and 3 worker boxes and get a start.

And once you have a real system, you can start looking into the principles of the underlying pieces such as Zookeeper etc.

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