I'm trying to identify a novel I borrowed years ago from the public library. Unfortunately, I had to return the book before I finished it.
The story involved a domed city in a post-apocalyptic world. The main character was employed as a engineer/repairman.
Life under the dome was pretty sweet for those who lived there, although the regime was very authoritarian. People had electronic valets which corresponded with your place in society. the valets of the rich were quite powerful, but the valets of the working class were weak.
There were refugees who lived outside the dome in the ruins of the former society. Among these refugees was a covert organization that opposed the authorities of the domed city.