The Demiurge

He lost his job, his wife, and his future. Good thing he just found the admin privileges to the multiverse. Daniel Marsh is having a spectacularly bad year. Replaced by AI at his software gig, handed divorce papers, and slapped with a terminal diagnosis, his life plan has been reduced to quietly waiting for death while reshelving paperbacks at the local library. Until... he finds a book that is literally out of this world. Suddenly, a dying engineer with nothing left to lose is handed the source code to existence itself. Armed with the blueprints of creation and a stubborn refusal to go quietly, Daniel is about to learn that when your own world falls apart, the only logical next step... is to build new ones. The first book in the Demiurge series by Constantine Superstes.