If you haven't seen Operator Mono by Hoefler and Co., it's worth checking out. It's spendy but worth it if you can expense account it for your team.
In Atom, go to the Atom Menu and select "Open Your Stylesheet."
The just drop in the following:
Feel free to play with the line-heights and font-size. If your font isn't installed, you'll see a default font of some variety. Be sure to remove any previous font settings in the preferences.