Company lists · Data refreshed September 2026

Top 25 Legacy app modernization companies based in the United States

Name: Legacy app modernization 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 20, 2026 661 companies tracked

RevenueBase identified 661 legacy app modernization companies headquartered in the United States as of September 2026 and tracks 32,357 professional contacts across them, including 8,732 with verified work emails. Austin is the largest hub.

This list covers legacy app modernization 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 20, 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 20, 2026 86% judged on-target in blind review

661Companies

32,357Contacts tracked

8,732Verified emails

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The 25 largest legacy app modernization companies based in the United States

Ranked by team size

Top 25 of 661 legacy app modernization companies based in the United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to legacy app modernization 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	R Systems	Indirect evidence	El Dorado Hills, CA, United StatesHQ checked Sep 20, 2026	5,001-10,000	7,360 contacts →
	Indirect evidence “RSI is a trusted software engineering and digital transformation services partner to global enterprises navigating technological change.” Source: RevenueBase Database · checked Sep 20, 2026
2	Improving	Indirect evidence	Plano, TX, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,578 contacts →
	Indirect evidence “Improving is a leading IT professional services firm committed to helping companies achieve lasting success through modern technology.” Source: RevenueBase Database · checked Sep 20, 2026
3	Hughes Systique Corporation HSC	Indirect evidence	Rockville, MD, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,524 contacts →
	Indirect evidence “Hughes Systique Corporation (HSC) is a global digital engineering and transformation partner enabling enterprises to modernize, innovate, and grow through its AI-First approach.” Source: RevenueBase Database · checked Sep 20, 2026
4	Royal Cyber INC	Indirect evidence	Naperville, IL, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,325 contacts →
	Indirect evidence “Royal Cyber is a trusted global IT consulting & digital transformation partner, empowering enterprises for over two decades to evolve with agility, security, and innovation.” Source: RevenueBase Database · checked Sep 20, 2026
5	Tanisha Systems, INC	Indirect evidence	Boston, MA, United StatesHQ checked Sep 20, 2026	1,001-5,000	844 contacts →
	Indirect evidence “Tanisha Systems, founded in 2002 in Massachusetts-USA, is a leading provider of Custom Application Development and end-to-end IT Services to clients globally.” Source: RevenueBase Database · checked Sep 20, 2026
6	Xtglobal, INC	Indirect evidence	Plano, TX, United StatesHQ checked Sep 20, 2026	501-1,000	841 contacts →
	Indirect evidence “Founded in 1998, XTGlobal, Inc.” Source: RevenueBase Database · checked Sep 20, 2026
7	Suneratech	Indirect evidence	Troy, MI, United StatesHQ checked Sep 20, 2026	1,001-5,000	692 contacts →
	Indirect evidence “SuneraTech is now at the frontline of Digital Transformation and enables innovation to promote futuristic organizations.” Source: RevenueBase Database · checked Sep 20, 2026
8	Msys Technologies	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 20, 2026	201-500	688 contacts →
	Indirect evidence “MSys Technologies (SDC Awards Winner) is a reliable partner for product engineering services and digital transformation projects for its Enterprise and Silicon Valley clientele.” Source: RevenueBase Database · checked Sep 20, 2026
9	Gemini Consulting & Services	Indirect evidence	Saint Louis, MO, United StatesHQ checked Sep 20, 2026	501-1,000	549 contacts →
	Indirect evidence “Gemini Consulting & Services (GCS) is a leading provider of technology solutions.” Source: RevenueBase Database · checked Sep 20, 2026
10	STG	Indirect evidence	Salt Lake City, UT, United StatesHQ checked Sep 20, 2026	51-200	508 contacts →
	Indirect evidence “Your Business Technology Partner.” Source: RevenueBase Database · checked Sep 20, 2026
11	Growth Acceleration Partners	Indirect evidence	Austin, TX, United StatesHQ checked Sep 20, 2026	501-1,000	507 contacts →
	Indirect evidence “Growth Acceleration Partners is a consulting and technology services company.” Source: RevenueBase Database · checked Sep 20, 2026
12	Zoolatech	Partial evidence	Miami, FL, United StatesHQ checked Sep 20, 2026	501-1,000	468 contacts →
	Partial evidence “Zoolatech is a global software engineering partner helping enterprises modernize legacy systems, adopt AI, and build scalable digital platforms.” Source: RevenueBase Database · checked Sep 20, 2026
13	Softweb Solutions Inc.	Indirect evidence	Plano, TX, United StatesHQ checked Sep 20, 2026	501-1,000	430 contacts →
	Indirect evidence “When we look at the way enterprises operate today, we see a fundamental challenge.” Source: RevenueBase Database · checked Sep 20, 2026
14	Excelencia	Indirect evidence	Austin, TX, United StatesHQ checked Sep 20, 2026	201-500	378 contacts →
	Indirect evidence “Excelencia is a US-based, ISO 27001:2022-certified technology services company, specializing in Oracle solutions and Digital Engineering.” Source: RevenueBase Database · checked Sep 20, 2026
15	United Techno	Indirect evidence	Pleasanton, CA, United StatesHQ checked Sep 20, 2026	201-500	372 contacts →
	Indirect evidence “At United Techno, we harness experience and collaboration to address customer challenges and devise intuitive solutions.” Source: RevenueBase Database · checked Sep 20, 2026
16	Newt Global	Partial evidence	Irving, TX, United StatesHQ checked Sep 20, 2026	501-1,000	334 contacts →
	Partial evidence “Empowering enterprise transformation with innovation, agility, and cloud-native modernization.” Source: RevenueBase Database · checked Sep 20, 2026
17	Primus Software Corporation	Indirect evidence	Duluth, GA, United StatesHQ checked Sep 20, 2026	201-500	303 contacts →
	Indirect evidence “Primus Software Corporation, a leading software services company with over 29 years of industry experience, is a trusted Business & Technology Partner for enterprises seeking to…” Source: RevenueBase Database · checked Sep 20, 2026
18	Valzo Soft Solutions	Indirect evidence	Alpharetta, GA, United StatesHQ checked Sep 20, 2026	1,001-5,000	286 contacts →
	Indirect evidence “ValzoSoft Solutions – Driving Innovation, Empowering Growth At ValzoSoft Solutions, we turn visionary ideas into transformative digital experiences.” Source: RevenueBase Database · checked Sep 20, 2026
19	Nalashaa Solutions	Indirect evidence	Edison, NJ, United StatesHQ checked Sep 20, 2026	201-500	278 contacts →
	Indirect evidence “At Nalashaa Solutions, we’re not just technologists; we’re your trusted partners in transformation.” Source: RevenueBase Database · checked Sep 20, 2026
20	Unified Infotech	Indirect evidence	NY, United StatesHQ checked Sep 20, 2026	201-500	251 contacts →
	Indirect evidence “Unified Infotech is an award winning digital transformation partner that was founded in 2010.” Source: RevenueBase Database · checked Sep 20, 2026
21	Geniusee	Indirect evidence	Austin, TX, United StatesHQ checked Sep 20, 2026	201-500	235 contacts →
	Indirect evidence “Geniusee is an AI and software engineering company with delivery hubs in Ukraine and Poland.” Source: RevenueBase Database · checked Sep 20, 2026
22	Alliance Global Services	Indirect evidence	Conshohocken, PA, United StatesHQ checked Sep 20, 2026	10001+	227 contacts →
	Indirect evidence “Alliance Global Services is a software development firm that partners with software, technology and information-intensive businesses on their mission critical work.” Source: RevenueBase Database · checked Sep 20, 2026
23	Zymr, Inc. Ai-Native Product Engineering Services	Indirect evidence	San Jose, CA, United StatesHQ checked Sep 20, 2026	201-500	222 contacts →
	Indirect evidence “Zymr is a fast-paced Silicon Valley-based software company that is leading the digital change.” Source: RevenueBase Database · checked Sep 20, 2026
24	Congruent Software INC	Indirect evidence	Bellevue, WA, United StatesHQ checked Sep 20, 2026	201-500	210 contacts →
	Indirect evidence “Founded in 1994, Congruent Software is a leading software development outsourcing company specialized in custom applications development, enterprise software, cloud computing, and…” Source: RevenueBase Database · checked Sep 20, 2026
25	Pulse Software Solutions LLC	Indirect evidence	Denver, CO, United StatesHQ checked Sep 20, 2026	51-200	207 contacts →
	Indirect evidence “Pulse Software Solutions is a Denver-based custom software development firm with a proud history of building internet-based systems since 1998.” Source: RevenueBase Database · checked Sep 20, 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: legacy app modernization 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 legacy app modernization companies.
Partial evidence: Its own public description names part of legacy app modernization companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name legacy app modernization 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 661 legacy app modernization companies based in the United States

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Legacy app modernization companies based in the United States at a glance

As of Sep 20, 2026

27.0%Verified-email coverage

49.0Average contacts per company

11-50Median size (employees)

3.8%Largest-city concentration · Austin

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

251

11-50

220

51-200

131

201-500

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 661 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 legacy app modernization 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 “legacy app modernization 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 legacy app modernization 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 legacy app modernization 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, 8,732 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 20, 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.

Legacy app modernization companies by metro

Legacy app modernization companies in Austin25

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 legacy app modernization 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 legacy app modernization companies are there based in the United States?

RevenueBase identified 661 legacy app modernization 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?

R Systems, headquartered in El Dorado Hills, tops this list with the largest team on record.

Which city has the most legacy app modernization companies?

Austin leads with 25 headquartered companies, followed by New York (21) and Atlanta (13).

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 8,732 verified decision-maker contacts tracked across these 661 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 20, 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.