This is the medic build that I currently use in the meta, it's actually quite fun to play with, since you have the option to both attack with tesla and heal your team with nanos.
This bot boasts a high amount of mobility, this makes it perfect as a medic as you can freely get to the teammates that need help the most, the mobility can also allow it to stealth attack and capture towers on the fly.
The bot is triforced around the outside and in the middle, this allow the bot to survive as long as possible in battle, but also allows it to be able to escape at low percents. Despite it's relatively low health, it is still able to tank a lot and stay completely functional.
Any criticism is much appreciated, cheers! ^^
SMG variant can be found here