Can the random thermal fluctuations of dark energy be responsible for taking an originally perfectly smooth universe and making it lumpy?

From my understanding, we have an issue explaining the 'lumpiness' of the universe as we now see it, given that it had to have been perfectly smooth at the big bang, we would expect it to look uniform.
If we're saying that dark energy pervades all of space and causes 'random' fluctuations, couldn't one of those, at an early moment of the universe, be responsible for the slight change required in it's smoothness to manifest a universe like ours?
I guess the first question I'm interested in is what is meant by fluctuations caused by dark energy and are they 'random'?