Once, I got approached for a job at Amazon to help "build the next big e-billing system"... What an uninspiring thing to do.
I do have an eventual interest to do research focused role, but interesting impactful research I think requires either high management (professor leading a large lab/research director) or making your own thing. The first I lack the experience for and the second doing a startup feels too risky to me today. If I was wealthy enough I would probably try making a research themed ai startup.
I get my overall high level fix from outside of work activities, so work is enjoyable mostly for the little puzzles it generates every day. I am sure that there are some fascinating considerations for a mega e-billing system, even if it isn't all that interesting in itself.