“All people are created equal but only the best work at StartupName”
In the story, this was the "commandment" used to justify why the pigs - as symbolic for the Soviet leaders - could take over Animal Farm.
If you use that quote, it would suggest that StartUp Name, made of "the best", wants to oppress others.
Now, I can think of some jobs where that is true. But if that's the case, you might not want to signal your intentions so directly.
To me, worrying over which clever slogan to put on tee shirt is a way of pretending to do the hard work of recruiting which is talking to people and evaluating their ability and deciding it doesn't fit and telling them so and being humane while doing so.
I think, "StartupName: We are hiring" is more to the point and a better conversation starter.
Good luck.