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We are advancing and enhancing the fundamentals of modern productivity— talent, efficiency, and safety.

Maintenance and Construction

Day & Zimmermann helps industrial plant owners in the Nuclear, Fossil, and Process industries lower their total cost of ownership by delivering innovative maintenance and construction services and solutions.


Day & Zimmermann plays a vital role in the defense sector by manufacturing, storing and demilitarizing a wide variety of ammunition products and providing related services to customers in the U.S. government and approved foreign countries.

Government Services

We are an integrated provider of global security, critical infrastructure solutions, and architecture and engineering services to the U.S. Government and commercial clients.

Workforce Solutions

We provide the talent needed for the jobs and projects critical to our client’s success.

Maintenance and Construction

D&Z increases engineering productivity while reducing costs

Day & Zimmermann was awarded engineering work at a specialty chemical manufacturing company and provided preliminary P&IDs, piping and valve specifications, along with electrical and instrumentation design.

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Our People

The best way to learn about life at Day & Zimmermann is to hear from the people who are living it. Meet the people behind our success.

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“Day & Zimmermann really gave me the opportunity and encouragement to learn and grow in my career.”


Government Services

Design of Top U.S. Law Enforcement and National Security Training Complex

Mason & Hanger, A Day & Zimmermann Company, performed architectural and engineering services for this new 426-acre campus built to test new Tactics, Techniques, and Procedures (TTPs) to meet the asymmetric threat that soldiers find on the battlefield. 

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Find Job Opportunities at Day & Zimmermann