Headquartered in Indianapolis, Janssen & Spaans Engineering is a full-service engineering consulting firm. Founded in 1976, the firm serves various government agencies, contractors and consultants throughout the United States. It specializes in providing transportation design solutions for complex bridge and road design projects. Janssen & Spaans Engineering offers bridge rehabilitation, design/build, surveying, and construction inspection and engineering services. Its staff includes traffic engineers, construction inspectors, licensed surveyors and computer technicians. Janssen & Spaans Engineering is also a member of the American Council of Engineering Companies.