Company lists · Data refreshed September 2026

Top 25 Qa staffing agencies based in the United States

RevenueBase identified 2,147 qa staffing agencies headquartered in the United States as of September 2026 and tracks 55,826 professional contacts across them, including 9,251 with verified work emails. New York is the largest hub.

This list covers qa staffing agencies 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 29, 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 29, 2026 86% judged on-target in blind review
2,147Companies
55,826Contacts tracked
9,251Verified emails
Explore this list → Free signup · no credit card · 500 free credits

The 25 largest qa staffing agencies based in the United States

Ranked by team size
Top 25 of 2,147 qa staffing agencies based in the United States, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to qa staffing agencies: 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.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Indirect evidenceChicago, IL, United StatesHQ checked Sep 29, 20261,001-5,0001,840 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 29, 2026
2Partial evidenceGreenville, United StatesHQ checked Sep 29, 2026201-5001,187 contacts →

Partial 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 29, 2026
3Partial evidenceBrookfield, WI, United StatesHQ checked Sep 29, 2026201-5001,019 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 29, 2026
4Partial evidenceDecatur, GA, United StatesHQ checked Sep 29, 20261,001-5,000980 contacts →

Partial evidence

“a1qa is a global software testing and QA outsourcing company trusted by IT firms and Fortune 500 enterprises to deliver software quality that holds under real-world pressure.”

Source: RevenueBase Database · checked Sep 29, 2026
5Partial evidencePleasanton, CA, United StatesHQ checked Sep 29, 20261,001-5,000906 contacts →

Partial evidence

“QASource is a leading provider of outsourced software quality engineering services, offering scalable and customizable QA solutions to clients worldwide.”

Source: RevenueBase Database · checked Sep 29, 2026
6Partial evidenceAtlanta, GA, United StatesHQ checked Sep 29, 20261,001-5,000901 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 29, 2026
7Partial evidenceIrving, TX, United StatesHQ checked Sep 29, 2026201-500881 contacts →

Partial evidence

“IMCS Group is an IT, Healthcare, and Professional Staffing Company that helps Enterprises optimize the business value of their Staffing investments and enables them to achieve…”

Source: RevenueBase Database · checked Sep 29, 2026
8Partial evidenceFort Lauderdale, FL, United StatesHQ checked Sep 29, 2026501-1,000855 contacts →

Partial evidence

“MedPro Healthcare Staffing is a Joint Commission certified, leading provider of temporary and contract staffing services to healthcare facilities throughout the United States.”

Source: RevenueBase Database · checked Sep 29, 2026
9Partial evidenceEdison, NJ, United StatesHQ checked Sep 29, 2026501-1,000762 contacts →

Partial evidence

“Integrated Resources Inc.(IRI) is a professional staffing firm specializing in contract, consulting & full time positions in the area of Information Technology, Life Science and…”

Source: RevenueBase Database · checked Sep 29, 2026
10Partial evidenceKalamazoo, MI, United StatesHQ checked Sep 29, 20261,001-5,000653 contacts →

Partial evidence

“Trillium Staffing Solutions is an employment service specializing in staffing, training, testing, on-site services, human resources and safety consulting.”

Source: RevenueBase Database · checked Sep 29, 2026
11Partial evidenceLivonia, MI, United StatesHQ checked Sep 29, 20261,001-5,000636 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 29, 2026
12Partial evidenceNew York, NY, United StatesHQ checked Sep 29, 2026501-1,000614 contacts →

Partial evidence

“Mitchell Martin Inc.(MMI) is one of the largest employee-owned staffing firms in the U.S, specializing in IT, healthcare, healthcare IT, accounting and finance, and professional…”

Source: RevenueBase Database · checked Sep 29, 2026
13Partial evidenceAlpharetta, GA, United StatesHQ checked Sep 29, 2026501-1,000591 contacts →

Partial evidence

“CodeForce 360 is a growing IT staffing company which thrives on a seasoned team of IT experts, a palpable international presence, and the ability to leverage the best of…”

Source: RevenueBase Database · checked Sep 29, 2026
14Indirect evidenceOrange, CA, United StatesHQ checked Sep 29, 20265,001-10,000584 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 29, 2026
15Partial evidenceHouston, TX, United StatesHQ checked Sep 29, 20261,001-5,000579 contacts →

Partial evidence

“LINK Staffing has been placing competent, dependable talent with Texas employers since 1980.”

Source: RevenueBase Database · checked Sep 29, 2026
16Partial evidenceAtlanta, GA, United StatesHQ checked Sep 29, 202651-200552 contacts →

Partial evidence

“Prestige Staffing is an award-winning, nationally recognized leader in professional staff augmentation serving local IT, Healthcare, and Accounting & Finance clients as well as…”

Source: RevenueBase Database · checked Sep 29, 2026
17Partial evidenceMillersville, MD, United StatesHQ checked Sep 29, 2026501-1,000541 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 29, 2026
18Indirect evidenceBurlington, MA, United StatesHQ checked Sep 29, 2026201-500468 contacts →

Indirect 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 29, 2026
19Partial evidenceSunnyvale, CA, United StatesHQ checked Sep 29, 2026201-500461 contacts →

Partial evidence

“ThinkSys is a QA outsourcing and software testing company for SaaS, FinTech, and Healthcare engineering teams that need reliable quality at scale.”

Source: RevenueBase Database · checked Sep 29, 2026
20Indirect evidenceSouthfield, MI, United StatesHQ checked Sep 29, 20261,001-5,000447 contacts →

Indirect evidence

“Trusted for Talent.”

Source: RevenueBase Database · checked Sep 29, 2026
21Indirect evidenceIndianapolis, IN, United StatesHQ checked Sep 29, 2026501-1,000417 contacts →

Indirect evidence

“iLAB specializes in Software Quality Assurance services, providing global solutions to our customers.”

Source: RevenueBase Database · checked Sep 29, 2026
22Indirect evidenceSan Mateo, CA, United StatesHQ checked Sep 29, 2026501-1,000403 contacts →

Indirect evidence

“We are celebrating 30 years of testing excellence and innovation at LogiGear, we're proud to be a cornerstone in our clients' journeys, delivering confidence not just in our…”

Source: RevenueBase Database · checked Sep 29, 2026
23Partial evidenceAldie, VA, United StatesHQ checked Sep 29, 202651-200356 contacts →

Partial evidence

“Vyze Inc is a leading IT staffing company that helps small and big organizations acquire, engage and retain the right talents, when and how you need them, such as contract-hire…”

Source: RevenueBase Database · checked Sep 29, 2026
24Partial evidenceNew York, NY, United StatesHQ checked Sep 29, 20261,001-5,000351 contacts →

Partial evidence

“ICS, a Korn Ferry Company, is one of the nation’s leading staffing and recruiting companies specializing in connecting talented people to the businesses who need them.”

Source: RevenueBase Database · checked Sep 29, 2026
25Indirect evidenceTX, United StatesHQ checked Sep 29, 2026501-1,000347 contacts →

Indirect evidence

“Quality Professionals (Q-Pros) is a global independent software Quality Assurance and Testing services provider supporting enterprise and government organizations.”

Source: RevenueBase Database · checked Sep 29, 2026

Showing 25 of 2,147 qa staffing agencies based in the United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 9,251 reachable decision-makers.

Free signup · no credit card

View the full list →

Qa staffing agencies based in the United States at a glance

As of Sep 29, 2026
16.6%Verified-email coverage
26.0Average contacts per company
11-50Median size (employees)
3.1%Largest-city concentration · New York
Sep 29, 2026Page data refreshed

Companies by employee count

1-10
708
11-50
738
51-200
486
201-500
129
501-1,000
47
1,001-5,000
32
5,001-10,000
4
10001+
2

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 2,147 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 qa staffing agencies, 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 “qa staffing agencies”. 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 qa staffing agencies), 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 qa staffing agencies, 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, 9,251 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 29, 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.

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 qa staffing agencies, 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 qa staffing agencies are there based in the United States?

RevenueBase identified 2,147 qa staffing agencies 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?

Addison Group, headquartered in Chicago, tops this list with the largest team on record.

Which city has the most qa staffing agencies?

New York leads with 66 headquartered companies, followed by Houston (55) and Atlanta (42).

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 9,251 verified decision-maker contacts tracked across these 2,147 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 29, 2026.

Ready to reach these companies? Verified emails and direct dials for all 2,147 qa staffing agencies based in the United States. Start with a free account, no credit card.

Download this list →

Related lists

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.