I applied as a intern and a tool developer once at two pretty famous AAA studios (due to friends, both actually didnt work out) and trust me when I say the bar is MUCH higher than a average backend job.
I do not want to discourage you, but if you have zero credits on MobyGames expect that they DO want to see proof that you can develop something like a fully working game engine from scratch (which means you understand the base concepts of game system development). Also, any proof of handson experience optimizing code for modern consoles which nowadays amount to Playstation 4, Playstation 5, Xbox One and Xbox Series S/X will probably be a huge plus.
If you can't show any of those things I am afraid most, if not all, studios will not be interested.