Core engine programming is no joke either, let alone on a commercial engine used by half the industry.
Stripe
Two Sigma
SpaceX
Maybe AirBnb & Netflix?
I'd guess Stripe, Palantir and AirBnB would be up there too.
I don't know if it's true, when I interviewed with them they seemed very interested even though I only took 3/4 years of a cs degree, and graduated with a different degree from RPI. I'm just explaining their reputation.
An example of why this is so subjective. For me, the "best" engineers make everyone around them look better. Like the star athlete that elevates the level of play of their teammates.
One of my best friends in university was top-ranked in our class for every year (although they discontinued the rankings shortly after my class finished). Just a brilliant mind but without any of the social awkwardness you might expect to accompany that. He would literally hold unofficial study tutorials where he taught other students the course material. And it's not like he did this because he thought he was awesome - the other students begged him to because he could explain concepts better than some of our own profs.