Company lists · Data refreshed September 2026
Top 25 Retrofit engineering staffing companies worldwide
RevenueBase identified 6,624 retrofit engineering staffing companies worldwide as of September 2026 and tracks 118,995 professional contacts across them, including 25,218 with verified work emails. The United States is the largest market and London the largest hub.
This list covers retrofit engineering staffing companies worldwide, 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. Country and city lists for retrofit engineering staffing companies follow the table.
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.
The 25 largest retrofit engineering staffing companies worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 2 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 3 | 1,666 contacts → | ||||
Partial evidence “Headquartered in Reston, Virginia, Bowman is a national engineering services firm delivering infrastructure solutions to customers who own, develop and maintain the built…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 4 | 1,494 contacts → | ||||
Indirect evidence “Renco S.p.A, an Italian company founded in 1979, is continually committed to providing its Clients with sound business solutions in an ever increasingly complex and challenging…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 5 | 1,480 contacts → | ||||
Indirect evidence “At Brooksource, relationships are at the center of everything we do.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 6 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 7 | 1,234 contacts → | ||||
Partial evidence “Let us make construction staffing work for you.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 8 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 9 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 10 | 947 contacts → | ||||
Indirect evidence “SRACO Human Resources Company was established in 2016 to provide the Saudi market with qualified and trained manpower for all activities, commercial, industrial, and domestic…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 11 | 754 contacts → | ||||
Indirect evidence “At Matchtech, we do more than recruit.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 12 | 745 contacts → | ||||
Indirect evidence “We are on a mission to futureproof North America.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 13 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 14 | 726 contacts → | ||||
Partial evidence “NES Global Talent provided engineering and technical personnel to the Oil & Gas, Power, Life Science and mining sectors.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 15 | 711 contacts → | ||||
Indirect evidence “VARITE has a definite spirit.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 16 | 660 contacts → | ||||
Indirect evidence “Depuis sa création en 2013, AptiSkills s’est imposée comme un acteur de référence avec plus de 10 agences réparties sur toute la France.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 17 | 626 contacts → | ||||
Indirect evidence “CLP Resources is now PeopleReady Skilled Trades.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 18 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 19 | 618 contacts → | ||||
Indirect evidence “HireQuest Direct specializes in day labor, general labor, disaster recovery, skilled labor, janitorial, site clean-up, composite crew, demolition, administrative, hospitality…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 20 | 589 contacts → | ||||
Strong evidence “Fircroft is now part of the NES Fircroft group - the world’s leading engineering staffing provider spanning the Oil & Gas, Power & Renewables, Infrastructure, Life Sciences…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 21 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 22 | 563 contacts → | ||||
Indirect evidence “Ü Ingenieurskunst bedeutet, mit Ressourcen richtig umzugehen.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 23 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 24 | 535 contacts → | ||||
Partial evidence “Ven India - Your Resource Augmentation Success Partner Empowering Industries with Skilled Engineering Talent Since 2010 At VEN India, we specialize in engineering resource…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 25 | 531 contacts → | ||||
Indirect evidence “The VGC Group is the leading recruitment partner to the UK infrastructure industry – ‘uniting talent and expertise to deliver success for all’.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
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: retrofit 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 retrofit engineering staffing companies.
- Partial evidence
- Its own public description names part of retrofit 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 retrofit 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 6,624 retrofit engineering staffing companies worldwide
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Retrofit engineering staffing companies worldwide at a glance
As of Sep 29, 2026Companies by employee count
Email recency is reported on each country list linked below.
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 retrofit 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.
- Coverage
- Every country. Country and city lists for retrofit engineering staffing companies are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “retrofit 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 retrofit 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 retrofit engineering staffing companies, and records with no verified work email.
- 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, 25,218 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.
Retrofit engineering staffing companies by location
35 lists · largest firstEvery Retrofit engineering staffing companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Retrofit engineering staffing companies based in the United States1,838
- Retrofit engineering staffing companies based in the United Kingdom699
- Retrofit engineering staffing companies based in the Netherlands477
- Retrofit engineering staffing companies based in Germany300
- Retrofit engineering staffing companies based in India289
- Retrofit engineering staffing companies based in Brazil263
- Retrofit engineering staffing companies based in Canada221
- Retrofit engineering staffing companies based in France215
- Retrofit engineering staffing companies based in Australia169
- Retrofit engineering staffing companies based in Italy117
- Retrofit engineering staffing companies based in Switzerland86
- Retrofit engineering staffing companies based in Belgium78
- Retrofit engineering staffing companies based in Spain70
- Retrofit engineering staffing companies based in Sweden69
- Retrofit engineering staffing companies based in South Africa53
- Retrofit engineering staffing companies based in the United Arab Emirates48
- Retrofit engineering staffing companies based in Norway47
- Retrofit engineering staffing companies based in Austria36
- Retrofit engineering staffing companies based in Ireland35
- Retrofit engineering staffing companies based in New Zealand33
- Retrofit engineering staffing companies based in Denmark29
Cities
- Retrofit engineering staffing companies based in London, United Kingdom154
- Retrofit engineering staffing companies based in Houston, United States71
- Retrofit engineering staffing companies based in Sao Paulo, Brazil55
- Retrofit engineering staffing companies based in Paris, France50
- Retrofit engineering staffing companies based in Toronto, Canada47
- Retrofit engineering staffing companies based in Manchester, United Kingdom45
- Retrofit engineering staffing companies based in New York, United States35
- Retrofit engineering staffing companies based in Austin, United States31
- Retrofit engineering staffing companies based in Denver, United States29
- Retrofit engineering staffing companies based in Sydney, Australia29
- Retrofit engineering staffing companies based in Dallas, United States27
- Retrofit engineering staffing companies based in Rotterdam, Netherlands27
- Retrofit engineering staffing companies based in San Francisco, United States26
- Retrofit engineering staffing companies based in Atlanta, United States25
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 retrofit 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 retrofit engineering staffing companies are there worldwide?
RevenueBase identified 6,624 retrofit engineering staffing companies worldwide 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?
Tradesmen International, headquartered in Macedonia, tops this list with the largest team on record.
Which country has the most retrofit engineering staffing companies?
The United States leads with 1,838 companies, followed by the United Kingdom (699) and the Netherlands (477). Every retrofit engineering staffing companies list by country and city is linked on this page.
Which city has the most retrofit engineering staffing companies?
London leads with 161 headquartered companies, followed by Houston (71) and Sao Paulo (55).
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 25,218 verified decision-maker contacts tracked across these 6,624 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.
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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.