Witches for Hire by Sam Argent

All recovering drug addict and witch Jeremy Ragsdale wants is to shamble on to the next job without any disasters. Instead, the temp agency saddles him with a fellow witch who hates him, an Amazon one violent outburst away from deportation, and a knight from another world as his boss. Even worse, their jack-of-all-trades magic business stumbles upon a conspiracy to kill Desmond the Great, Atlanta’s sexy star magician. Jeremy must prevent it without letting his colleagues know that he not only has ties to the energy vampires behind the plot, but that his past misdeeds might have instigated the attacks.

Despite Jeremy sporting a suit and tie like a good witch, his lies snowball to bite him in the ass. The lack of trust brewing between him and his teammates could cost Desmond his life and Jeremy his progress on the straight and narrow path if his secrets are revealed. Because no matter how much Jeremy has reformed, there’s still enough bad witch in him to kill anyone who messes with him or the people he cares about.