I would demand a clause that says you will be paid a minimum of X hours per week if you've spent that time on underestimated tickets.

Eg: even if I take on "5 hours" of tickets, but spend 40. I will at least be paid 25 hours. Basically a kind of floor on what you will be paid. Then you have discretion if you spend beyond the floor on a ticket.

Also the employer is setting themselves up for your cherry picking over estimated / fair estimate tickets and refusing to do under estimated tickets.

Depends on who's weighting the tickets, I suppose. If it's up to the dev, the company will be surprised by how many 100 hour tickets are suddenly popping up!

Never trust anybody who can't even get the word "paid" right.

"Payed" is a nautical term.

if you have to ask, you already know the answer ;)

Unless you are an actual 10x developer. Then, this is a goldmine.

Feels like the mafia hiring a software engineer :)