Well, I have two thoughts about that:

1) gigs without 24/7 operations are rare, because there is no good reason for a tech product not to be 24/7. it's not costing extra electricity to keep the lights on overnight, nor more staff. there are a bunch of these gigs (my last gig had no customers for 2+ years) but you shouldn't expect them, because part of the reason we're paid so much money is we're expected to deliver "continuous value". most devs would agree with this, because they all want to be able to deploy continuously, whenever they want. (which is a terrible idea, but it is the status quo.) furthermore, if you're doing your job right (and so is Ops), supporting a 24/7 product should not result in on-call pages, because nothing should be breaking outside regular business hours. if it is breaking outside regular hours, somebody sucks at their job. and Ops' job is pretty simple, so...

2) you do have lots of control over the roadmap, planning, etc. but nobody is going to walk up to you and say "hey we were just thinking of maybe doing this in the roadmap, is that okay with you?" you have to get involved, early, and consistently. you have to show you're not going to rock the boat, but that you will have good suggestions, and can show they will turn into better outcomes. you have to play a little politics, a little product ownership, and also an engineering role, in order to influence what the business decides to do. as you get more senior this gets easier because people will defer to you more, but even an extremely likeable junior can influence the roadmap.

on the off-chance that you're just trapped in engineering hell, with hostile management, a terrible product, and a completely apathetic and terrified staff, quit immediately. this isn't normal and you shouldn't think "oh, I'm trapped here." people don't stay in abusive relationships because there's no other choice, they stay because they've justified their own abuse.