Hiring a third party for your engineering should not be an impersonal or hands-off endeavor. Instead, you should thrive for direct involvement with their actions and ideas; otherwise, you may not end up with exactly what you want. Therefore, when looking for a company to hire, make sure that you find one that allows direct interaction with the technicians and engineers on site as well as plenty of communication throughout the entirety of the project by phone, video conference, et cetera.