Department of Defense NAICS 541330 contractors

Engineering Services. Contractors in this NAICS lane under Department of Defense.

Agency: Department of Defense

Last updated: April 19, 2026

Visible recipients

391

Mapped obligations

$384,687,047,787

Visible recipients tied to Department of Defense and NAICS 541330

Halvik, LLC

Vienna, VA

Vienna, VA | 202 awards | Top agency Department of Defense | NAICS 541330

$249,261,231

Analytical Mechanics Associates, Inc.

Hampton, VA

Hampton, VA | 129 awards | Top agency National Aeronautics and Space Administration | NAICS 541712

$52,040,035

American Systems Corporation

Mclean, VA

Mclean, VA | 295 awards | Top agency Department of Defense | NAICS 541330

$786,859,951

L3harris Interstate Electronics Corporation

Yorba Linda, CA

Yorba Linda, CA | 40 awards | Top agency Department of Defense | NAICS 541330

$1,104,254,164

Sierra Lobo INC

Fremont, OH

Fremont, OH | 99 awards | Top agency National Aeronautics and Space Administration | NAICS 541715

$251,781,912

Securigence LLC

Leesburg, VA

Leesburg, VA | 71 awards | Top agency Department of Defense | NAICS 541511

$2,501

Sev1tech, LLC

Woodbridge, VA

Woodbridge, VA | 225 awards | Top agency Department of Defense | NAICS 541712

$342,679,114

Leidos Engineering LLC

Reston, VA

Reston, VA | 5 awards | Top agency Department of Defense | NAICS 541310

$49,458,212

Tetra Tech, Inc.

Pasadena, CA

Pasadena, CA | 260 awards | Top agency Department of Defense | NAICS 541330

$2,269,677,772

Guidehouse Digital LLC

Mc Lean, VA

Mc Lean, VA | 389 awards | Top agency Department of Homeland Security | NAICS 541512

$59,807,488

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