Company lists · Data refreshed September 2026

Top 25 Federal engineering staffing companies based in the United States

Name: Federal engineering staffing companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 1,996 companies tracked

RevenueBase identified 1,996 federal engineering staffing companies headquartered in the United States as of September 2026 and tracks 65,140 professional contacts across them, including 15,062 with verified work emails. Houston is the largest hub.

This list covers federal engineering staffing companies headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 28, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 28, 2026 86% judged on-target in blind review

1,996Companies

65,140Contacts tracked

15,062Verified emails

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The 25 largest federal engineering staffing companies based in the United States

Ranked by team size

Top 25 of 1,996 federal engineering staffing companies based in the United States, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to federal engineering staffing companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	DAY & Zimmermann	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 28, 2026	10001+	3,483 contacts →
	Indirect evidence “When you’ve been around for more than a century, you know a thing or two!” Source: RevenueBase Database · checked Sep 28, 2026
2	Airswift	Partial evidence	Houston, TX, United StatesHQ checked Sep 28, 2026	501-1,000	2,128 contacts →
	Partial evidence “We support STEM professionals looking for jobs with exceptional firms in the technology and engineering sectors.” Source: RevenueBase Database · checked Sep 28, 2026
3	Loyal Source Government Services	Indirect evidence	Orlando, FL, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,759 contacts →
	Indirect evidence “Loyal Source is an Orlando-based workforce solutions provider dedicated to delivering elite services worldwide.” Source: RevenueBase Database · checked Sep 28, 2026
4	Infotree Global Solutions	Indirect evidence	Plymouth, MI, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,545 contacts →
	Indirect evidence “Infotree Global was founded in 2002 in a small office in Canton, MI, Infotree Global had a clear mission; To bring the world’s best talent together with the greatest companies…” Source: RevenueBase Database · checked Sep 28, 2026
5	ALKU	Indirect evidence	Andover, MA, United StatesHQ checked Sep 28, 2026	201-500	1,480 contacts →
	Indirect evidence “ALKU® is a highly specialized consulting services firm focused on deploying highly skilled consulting resources in the areas of Technologies, HCIT, Life Sciences, and Government…” Source: RevenueBase Database · checked Sep 28, 2026
6	Brooksource	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,480 contacts →
	Indirect evidence “At Brooksource, relationships are at the center of everything we do.” Source: RevenueBase Database · checked Sep 28, 2026
7	System ONE	Partial evidence	Pittsburgh, PA, United StatesHQ checked Sep 28, 2026	5,001-10,000	1,386 contacts →
	Partial evidence “System One is a leading provider of specialized, highly technical outsourced services, workforce solutions, staffing, and recruiting to critical infrastructure, technology, life…” Source: RevenueBase Database · checked Sep 28, 2026
8	TRS Staffing Solutions	Strong evidence	Greenville, United StatesHQ checked Sep 28, 2026	201-500	1,187 contacts →
	Strong evidence “TRS Staffing Solutions is a world leading engineering recruitment agency specialising in the recruitment and supply of professional, engineering, technical and field talent.” Source: RevenueBase Database · checked Sep 28, 2026
9	Cynet Systems	Indirect evidence	Sterling, VA, United StatesHQ checked Sep 28, 2026	1,001-5,000	732 contacts →
	Indirect evidence “Headquartered in Washington DC Metro Area, Cynet Systems is a top talent supplier for companies across North America.” Source: RevenueBase Database · checked Sep 28, 2026
10	C&s Companies	Partial evidence	Syracuse, NY, United StatesHQ checked Sep 28, 2026	501-1,000	657 contacts →
	Partial evidence “Founded in 1968, the C&S Companies are known nationwide for client-focused engineering, architecture, planning, environmental, and construction services.” Source: RevenueBase Database · checked Sep 28, 2026
11	Trax International Corporation	Indirect evidence	Las Vegas, NV, United StatesHQ checked Sep 28, 2026	1,001-5,000	587 contacts →
	Indirect evidence “TRAX International has more than 30 years of experience delivering a range of professional technical services to the U.S.” Source: RevenueBase Database · checked Sep 28, 2026
12	North Wind Group	Strong evidence	Idaho Falls, ID, United StatesHQ checked Sep 28, 2026	1,001-5,000	586 contacts →
	Strong evidence “North Wind is one of the nation’s leading small businesses providing engineering, construction, environmental, and mission support services to federal and state agencies and…” Source: RevenueBase Database · checked Sep 28, 2026
13	Volt Technical Resources	Indirect evidence	Orange, CA, United StatesHQ checked Sep 28, 2026	5,001-10,000	584 contacts →
	Indirect evidence “A Six Sigma Company ~61 years in the industry ~Nationwide 4 million+ candidate database ~Fortune Company ~Extensive E-Recruiting capabilities ~Reference and Employment check…” Source: RevenueBase Database · checked Sep 28, 2026
14	Confident Staffing INC	Partial evidence	Medford, OR, United StatesHQ checked Sep 28, 2026	201-500	555 contacts →
	Partial evidence “We provide staffing services in Oregon and Washington and Direct Hire services nationwide.” Source: RevenueBase Database · checked Sep 28, 2026
15	Tech USA	Partial evidence	Millersville, MD, United StatesHQ checked Sep 28, 2026	501-1,000	541 contacts →
	Partial evidence “A premier provider of staffing solutions, Tech USA is in the top 1% of the Recruiting Industry.” Source: RevenueBase Database · checked Sep 28, 2026
16	E2 Consulting Engineers, INC	Partial evidence	Emeryville, CA, United StatesHQ checked Sep 28, 2026	501-1,000	526 contacts →
	Partial evidence “Dedicated to “Excellence in Engineering,” E2 Consulting Engineers, Inc.(E2) is a professional services firm established in 1988 specializing in a full spectrum of engineering…” Source: RevenueBase Database · checked Sep 28, 2026
17	EASI	Indirect evidence	Hanover, MD, United StatesHQ checked Sep 28, 2026	1,001-5,000	526 contacts →
	Indirect evidence “EASi is now Actalent.” Source: RevenueBase Database · checked Sep 28, 2026
18	Sunrise Systems, INC	Partial evidence	Edison, NJ, United StatesHQ checked Sep 28, 2026	501-1,000	494 contacts →
	Partial evidence “Sunrise Systems was founded in 1990 with a clear vision to deliver world-class staffing service solutions in all labor categories, including IT consulting and solutions; all with…” Source: RevenueBase Database · checked Sep 28, 2026
19	Trillium Construction Services	Indirect evidence	Kalamazoo, MI, United StatesHQ checked Sep 28, 2026	201-500	494 contacts →
	Indirect evidence “Trillium Construction Services has over a quarter of a century of experience in the construction recruiting industry.” Source: RevenueBase Database · checked Sep 28, 2026
20	Launch Technical Workforce Solutions	Indirect evidence	Oak Brook, IL, United StatesHQ checked Sep 28, 2026	1,001-5,000	488 contacts →
	Indirect evidence “LAUNCH Technical Workforce Solutions partners with aviation, transportation, and industrial organizations to solve complex workforce challenges.” Source: RevenueBase Database · checked Sep 28, 2026
21	Black Diamond Networks	Strong evidence	Andover, MA, United StatesHQ checked Sep 28, 2026	51-200	481 contacts →
	Strong evidence “Delivering Contingent Staffing, Specialized Consulting, and Managed Project Services (MSP, FSP, FSO) for Engineering, IT, and Lifescience enterprises.” Source: RevenueBase Database · checked Sep 28, 2026
22	Entegee	Partial evidence	Burlington, MA, United StatesHQ checked Sep 28, 2026	201-500	468 contacts →
	Partial evidence “For the last sixty years Entegee has provided Fortune 500 and other companies with highly qualified engineering and technical personnel.” Source: RevenueBase Database · checked Sep 28, 2026
23	The Mannik & Smith Group, INC	Indirect evidence	Maumee, OH, United StatesHQ checked Sep 28, 2026	501-1,000	467 contacts →
	Indirect evidence “Technical skill, relationships and leadership are the foundation of The Mannik & Smith Group, Inc.(MSG) and have been not just a tradition, but a way of doing business for 70…” Source: RevenueBase Database · checked Sep 28, 2026
24	Bartech Staffing	Indirect evidence	Southfield, MI, United StatesHQ checked Sep 28, 2026	1,001-5,000	447 contacts →
	Indirect evidence “Trusted for Talent.” Source: RevenueBase Database · checked Sep 28, 2026
25	Sterling Engineering	Strong evidence	Westchester, IL, United StatesHQ checked Sep 28, 2026	501-1,000	402 contacts →
	Strong evidence “Sterling is an award-winning professional engineering consulting and technical staffing company.” Source: RevenueBase Database · checked Sep 28, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: federal engineering staffing companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names federal engineering staffing companies.
Partial evidence: Its own public description names part of federal engineering staffing companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name federal engineering staffing companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 1,996 federal engineering staffing companies based in the United States

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Federal engineering staffing companies based in the United States at a glance

As of Sep 28, 2026

23.1%Verified-email coverage

32.6Average contacts per company

11-50Median size (employees)

2.7%Largest-city concentration · Houston

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

753

11-50

663

51-200

363

201-500

135

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 1,996 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among federal engineering staffing companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “federal engineering staffing companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names federal engineering staffing companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among federal engineering staffing companies, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 15,062 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 28, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Federal engineering staffing companies by metro

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names federal engineering staffing companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many federal engineering staffing companies are there based in the United States?

RevenueBase identified 1,996 federal engineering staffing companies headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

DAY & Zimmermann, headquartered in Philadelphia, tops this list with the largest team on record.

Which city has the most federal engineering staffing companies?

Houston leads with 53 headquartered companies, followed by Washington (33) and Atlanta (31).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 15,062 verified decision-maker contacts tracked across these 1,996 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 28, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.