Voldemort was a real thing at LinkedIn, and it was an effort led by Jay Kreps, CEO/Founder of Confluent and lead of the original Kafka team at LinkedIn.

VoldemortDB is actually real: https://www.project-voldemort.com/voldemort/

Maybe this is less of a satire of hiring practices than a satire of fickle tech trendiness. Like the $NOUN.js drinking game.