As a mechanical field engineer, you can work in a variety of industries, including aerospace, construction, automotive, and power. Your responsibilities include optimizing mechanical processes while working closely with other engineers to solve technical issues quickly and effectively, especially while on a job site. Overall, your duties often include designing, testing, maintaining, troubleshooting, and repairing mechanical systems and equipment. In some mechanical field engineer positions, you create instructions for equipment installation and fabrication, develop designs to solve construction-related problems, and authorize modifications to systems as needed. You must accurately document all design changes and other job-related activities as required by regulatory agencies and company guidelines.