mag868: I’m a software engineer.
I used to work at a start-up. Was putting in 60+ hrs each week (this was during the summer so Shabbos was late). I quit that job (for a number of reasons) and went to work at a large company. Now I work a standard 40 hr week.
As a software engineer your hours will be determined by the team you work with. Make sure to clarify this during the interview process.