Be employed in doing something
Definition 1 of 2
Pro Tip 1/3Task focus
Indicates being actively involved in a specific task or activity. 
The volunteers are employed in organizing the charity event.
Pro Tip 2/3Temporary action
Suggests a temporary or current engagement, not necessarily a long-term role. 
I am employed in setting up the new equipment only for this week.
Pro Tip 3/3Active involvement
Implies direct, hands-on involvement in the work, not merely overseeing or advising. 
The artist is employed in creating a mural for the city square.