Opensource.com - https://opensource.com/article/18/6/roles-squad-model
If you’re just getting started with a squad model, you may not be sure what roles you’ll need for your team to function smoothly. Our squad model in the IBM Digital Business Group is based on the Spotify Squad framework. At a high level, a squad is a small, cross-functional team that has autonomy to deliver on their squad mission. The squad missions and cross-squad priorities are set at an organizational level.