Company lists · Data refreshed September 2026

Top 25 Engineering staffing services based in the United States

Name: Engineering staffing services based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 4,621 companies tracked

RevenueBase identified 4,621 engineering staffing services headquartered in the United States as of September 2026 and tracks 154,127 professional contacts across them, including 29,502 with verified work emails. Houston is the largest hub.

This list covers engineering staffing services 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 21, 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 21, 2026 86% judged on-target in blind review

4,621Companies

154,127Contacts tracked

29,502Verified emails

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The 25 largest engineering staffing services based in the United States

Ranked by team size

Top 25 of 4,621 engineering staffing services based in the United States, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to engineering staffing services: 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	Robert Half	Indirect evidence	Menlo Park, CA, United StatesHQ checked Sep 21, 2026	10001+	25,574 contacts →
	Indirect evidence “At Robert Half, we prioritize your security-if you believe you've encountered a scam or fraudulent recruiter, please report it immediately to All Robert Half recruiters…” Source: RevenueBase Database · checked Sep 21, 2026
2	Tradesmen International	Indirect evidence	Macedonia, OH, United StatesHQ checked Sep 21, 2026	10001+	4,999 contacts →
	Indirect evidence “Founded in 1992, Tradesmen International is North America’s premier resource for proven skilled craftsmen and labor consulting services.” Source: RevenueBase Database · checked Sep 21, 2026
3	Spherion	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 21, 2026	10001+	4,263 contacts →
	Partial evidence “We’re Spherion-a staffing and recruiting pioneer that’s been driving careers and helping businesses grow for over 75 years.” Source: RevenueBase Database · checked Sep 21, 2026
4	Airswift	Partial evidence	Houston, TX, United StatesHQ checked Sep 21, 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 21, 2026
5	Addison Group	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,840 contacts →
	Indirect evidence “Addison Group provides comprehensive talent solutions and consulting services across diverse practice areas, including Non-Clinical Healthcare, Information Technology (IT), Human…” Source: RevenueBase Database · checked Sep 21, 2026
6	MEDIX	Partial evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	501-1,000	1,753 contacts →
	Partial evidence “Medix provides workforce solutions to clients and creates opportunity for talent in the Healthcare, Life Sciences, Engineering and Technology fields.” Source: RevenueBase Database · checked Sep 21, 2026
7	Resourcemfg	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 21, 2026	5,001-10,000	1,639 contacts →
	Indirect evidence “ResourceMFG places temporary and direct hire employees within the total spectrum of manufacturing jobs including production, quality, maintenance, supervision, and all levels of…” Source: RevenueBase Database · checked Sep 21, 2026
8	Nesco Resource	Indirect evidence	Mayfield Heights, OH, United StatesHQ checked Sep 21, 2026	501-1,000	1,599 contacts →
	Indirect evidence “Companies need talent.” Source: RevenueBase Database · checked Sep 21, 2026
9	Brooksource	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 21, 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 21, 2026
10	BHI Energy	Partial evidence	Weymouth, MA, United StatesHQ checked Sep 21, 2026	5,001-10,000	1,427 contacts →
	Partial evidence “BHI Energy is an industry-leading provider of specialty services and staffing solutions in support of the daily operations, routine maintenance and capital investment requirements…” Source: RevenueBase Database · checked Sep 21, 2026
11	Construction Labor Contractors	Partial evidence	Round Rock, TX, United StatesHQ checked Sep 21, 2026	501-1,000	1,234 contacts →
	Partial evidence “Let us make construction staffing work for you.” Source: RevenueBase Database · checked Sep 21, 2026
12	Outsource	Partial evidence	El Segundo, CA, United StatesHQ checked Sep 21, 2026	n/a	1,230 contacts →
	Partial evidence “Outsource is the largest staffing firm in the nation specializing in the placement of low voltage and electrical talent.” Source: RevenueBase Database · checked Sep 21, 2026
13	TRS Staffing Solutions	Strong evidence	Greenville, United StatesHQ checked Sep 21, 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 21, 2026
14	QPS Employment Group	Partial evidence	Brookfield, WI, United StatesHQ checked Sep 21, 2026	201-500	1,019 contacts →
	Partial evidence “Founded in 1985, QPS Employment Group has grown from a two-person operation to one of the nation's leading staffing and recruiting firms, with more than 300 internal employees…” Source: RevenueBase Database · checked Sep 21, 2026
15	Staff Zone	Partial evidence	Roswell, GA, United StatesHQ checked Sep 21, 2026	10001+	1,011 contacts →
	Partial evidence “Staff Zone is a Best-in-Class® construction staffing agency specializing in meeting the daily workforce needs of the construction, light industrial, and special events industries.” Source: RevenueBase Database · checked Sep 21, 2026
16	ARI	Partial evidence	East Peoria, IL, United StatesHQ checked Sep 21, 2026	1,001-5,000	979 contacts →
	Partial evidence “ARi is a global engineering firm headquartered in East Peoria, Illinois, USA offering services for: Embedded Software, Product Engineering, Manufacturing Engineering and Testing &…” Source: RevenueBase Database · checked Sep 21, 2026
17	Remx The Workforce Experts	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 21, 2026	1,001-5,000	901 contacts →
	Partial evidence “RemX is the professional staffing division of EmployBridge, a $3 billion staffing organization with more than 600 offices in the U.S.” Source: RevenueBase Database · checked Sep 21, 2026
18	The Reserves Network	Partial evidence	Fairview Park, OH, United StatesHQ checked Sep 21, 2026	n/a	812 contacts →
	Partial evidence “The Reserves Network is a leading provider of staffing services for the Office, Industrial, Professional and Technical markets.” Source: RevenueBase Database · checked Sep 21, 2026
19	Eastridge Workforce Solutions	Partial evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	n/a	803 contacts →
	Partial evidence “Eastridge Workforce Solutions is a trusted staffing partner helping businesses build stronger, more productive teams across industrial and professional sectors.” Source: RevenueBase Database · checked Sep 21, 2026
20	Crown Staffing	Partial evidence	Westerville, OH, United StatesHQ checked Sep 21, 2026	201-500	749 contacts →
	Partial evidence “Crown Staffing is a leading staffing agency in 14 states, providing direct hire, temporary, and temp-to-hire staffing solutions to businesses of all sizes.” Source: RevenueBase Database · checked Sep 21, 2026
21	Cynet Systems	Indirect evidence	Sterling, VA, United StatesHQ checked Sep 21, 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 21, 2026
22	Varite INC	Indirect evidence	San Jose, CA, United StatesHQ checked Sep 21, 2026	1,001-5,000	711 contacts →
	Indirect evidence “VARITE has a definite spirit.” Source: RevenueBase Database · checked Sep 21, 2026
23	PTS Advance	Indirect evidence	Tustin, CA, United StatesHQ checked Sep 21, 2026	501-1,000	706 contacts →
	Indirect evidence “PTS Advance teams up with thousands of candidates, clients, and partners to advance workforce utilization in the Oil, Gas & Chemicals, Power & Renewables, Advanced Manufacturing…” Source: RevenueBase Database · checked Sep 21, 2026
24	Acro Service Corp	Partial evidence	Livonia, MI, United StatesHQ checked Sep 21, 2026	1,001-5,000	636 contacts →
	Partial evidence “With singular global reach and agility, Acro Service Corporation offers you a unique integrated approach to staffing and consulting solutions.” Source: RevenueBase Database · checked Sep 21, 2026
25	Automation Personnel Services, INC	Indirect evidence	Birmingham, AL, United StatesHQ checked Sep 21, 2026	10001+	624 contacts →
	Indirect evidence “Automation Personnel Services was founded in Birmingham, AL almost 30 years ago and has expanded coast to coast with 40 Branch offices in eleven states.” Source: RevenueBase Database · checked Sep 21, 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: engineering staffing services. 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 engineering staffing services.
Partial evidence: Its own public description names part of engineering staffing services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name engineering staffing services. 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 4,621 engineering staffing services based in the United States

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Engineering staffing services based in the United States at a glance

As of Sep 21, 2026

19.1%Verified-email coverage

33.4Average contacts per company

11-50Median size (employees)

3.8%Largest-city concentration · Houston

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

2,021

11-50

1,381

51-200

769

201-500

264

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 4,621 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 engineering staffing services, 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 “engineering staffing services”. 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 engineering staffing services), 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 engineering staffing services, 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, 29,502 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 21, 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.

Engineering staffing services by metro

Engineering staffing services in Houston174
Engineering staffing services in New York115
Engineering staffing services in Dallas80
Engineering staffing services in Atlanta70
Engineering staffing services in Austin69
Engineering staffing services in Chicago58
Engineering staffing services in Denver58
Engineering staffing services in Tampa48
Engineering staffing services in Orlando46
Engineering staffing services in San Diego44
Engineering staffing services in Charlotte41
Engineering staffing services in Miami41
Engineering staffing services in San Francisco41
Engineering staffing services in Los Angeles40
Engineering staffing services in Phoenix39
Engineering staffing services in Sheridan39
Engineering staffing services in Wilmington37
Engineering staffing services in Indianapolis31
Engineering staffing services in Greenville30
Engineering staffing services in Boston29
Engineering staffing services in San Antonio26
Engineering staffing services in Irving25
Engineering staffing services in Plano25
Engineering staffing services in Portland25

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 engineering staffing services, 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 engineering staffing services are there based in the United States?

RevenueBase identified 4,621 engineering staffing services 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?

Robert Half, headquartered in Menlo Park, tops this list with the largest team on record.

Which city has the most engineering staffing services?

Houston leads with 174 headquartered companies, followed by New York (115) and Dallas (80).

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 29,502 verified decision-maker contacts tracked across these 4,621 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 21, 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.