Laundry Files Series by Charles Stross Written by a ex-programmer, features a world where magic is a branch of mathematics, so you can for example write an app

Laundry Files Series by Charles Stross Written by a ex-programmer, features a world where magic is a branch of mathematics, so you can for example write an app to summon demons, or accidentally turn yourself into a vampire by implementing a particularly extravagant algorithm. https://www.goodreads.com/series/50764-laundry-files https://www.goodreads.com/series/50764-laundry-files