I’m not sure that these are the best suggestions but I figure I can at least offer some that might fill that.
I’m not quite sure it meets your needs, but Fred the Vampire Accountant is kind of up this alley. I’ll warn you that the first little bit feels very much like vignettes, and the solutions are a little bit too convenient but that beginning pays off later in the book series.
Naomi Novik‘s Scholomance series has this.
The Library at Mount Char isn’t a series and there’s a little bit more WTF-energy, but it’s somewhat up this alley.