Autonomy, Mastery, Purpose: you'll be happy with your job to the extent it has these qualities. How much autonomy do most engineering jobs give you? Not much I imagine. How much mastery? Well you're certainly not going to be exploring many new skills, or even masterting particularly difficult ones on average; it's mostly repetitive scaffolding with glue.
Purpose is pretty much the only one that technology work has plenty of. Everything runs on information technology now, so if you're interested in tech, which you probably are, you'll find lots of purpose in developing or administering information systems. This only goes so far before the lack of autonomy gets to you, or you hit the mastery ceiling pretty quickly at any given job.