As Senior Engineer, your job is to make sure that other engineers understand ss14’s engineering system and can perform their jobs optimally. This can include teaching interns basics or assisting a station engineer in a new repair or construction. You also should teach any new atmospheric technicians how atmos works if they are new, as it is required for the round to not fall apart from oxygen loss.
People who play this role must have significant playtime in engineering, as well as being willing to teach others. If you don’t want to be a mentor, don’t choose the role and deprive a new player someone to teach them.