Saw someone complaining not enough dev rants.

I have a coworker who's a good friend. Got him this job. He has good output, smart kid, but our coding styles clash.

I believe in DevEx (since we write internal tools). He sees it as premature optimization.

Example:
He won't validate data from input we don't control because "it shouldn't change that much".

Results:
He codes fast, but delivers shit that breaks in production and others (me) have to fix.

It's frustrating.