Are there non-bridge crew roles?

I am helping to develop a campaign for Star Trek Adventures. This campaign would focus on several new recruits on their first assignment (all ensign or non-commissioned). None of them would be bridge crew. Rather, they would be more rank-and-file members on a smaller ship who would progress to bridge crew throughout the campaign.

One of the last steps in character creation is to choose a role. The roles listed in the core rules are all bridge officers – people who generally have considerable experience already. Are there roles somewhere that are more appropriate to non-bridge crew?