Headquartered in Bozeman MT but with satellite offices in Billings. MT and Stanley, ND, Allied Engineering Services, Inc. is an employee-owned full service civil engineering and surveying company, founded by principals of three small specialty-engineering companies who merged their wealth of experience and expertise to provide a wider array of engineering services to clients. The result was a potent combination of capabilities and client focus that blossomed Allied into "the biggest little engineering firm in Montana." Specializing in Civil Engineering, Water Resources Engineering, Geotechnical Engineering, Land Surveying, and Construction Services, AESI is licenced to work in Colorado, Idaho, Montana, North Dakota, South Dakota, Texas, Washington, Wisconsin, and Wyoming.