In a recent campaign I've been playing a Thief Rogue and one of my favorite characters: Razor McStabbington, MD. Doctor and Ninja. He's a doctor who heaps scorn on clerics and paladins who outsource the work to some vague concept in the sky, "Oh, great Googly-Moogly, please heal this warrior's broken arm!" It frustrates him that this approach works, but doesn't change his attitude. Expertise in Medicine and Stealth, along with the Healer feat.
Despite the presence of a Paladin and Cleric he's at least arguably still the party's primary healer at level 7 because he can toss out 1d6+11 hp in healing as a bonus action (or do it twice/round!) at a cost of 5sp per heal. Sure, he can only do it once per character per short rest, but it really adds up. He's like the Warlock of healers and has been accused of being OP more than once.