I would suggest editing the essay before you submit it. Not sure, but I think you meant “by” not “my” in this sentence, “Over 2 years, I’ve self taught myself how to develop complex web apps that are used my 10s of 1000’s of people.” Also in that sentence, one-word numbers are supposed to be spelled out. so “two” “tens of thousands.” It looks like you are sending a text message when you don’t spell it out, rather informal. But, not all people agree with that rule so do as you wish.