What We Do

We specialize in construction & engineering, staffing and defense solutions for leading corporations and governments around the world.

ECM Project Group Photo

Engineering Construction & Maintenance

Day & Zimmermann is a leading provider of engineering, construction, and maintenance services for the power, process, and industrial markets. We deliver complex projects safely, on time, and within budget by leveraging wide-ranging capabilities, long-standing industry experience, innovative technology, and expert project teams

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munitions can assembly


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

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drug dog

Government Services

Our Government Services division is a trusted provider of mission support solutions to government customers operating in complex and high threat environments.

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Workforce Solutions

Yoh is Day & Zimmermann's workforce solutions company and helps customers establish and efficientstrategic talent supply chain to address the complexities of managing cost, risk, quality and value of the entire workforce.

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Diversity & Inclusion at Day & Zimmermann

Our Diversity Vision

To be a company that embraces diversity, is inclusive, and thrives on learning so that our employees feel respected and invited to contribute to the success of our company, clients, suppliers and communities.

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We are Many, Diverse Voices of Betterment

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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“I am excited to be part of an amazing organization and work with colleagues who share the same values as I have.”


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