Company lists · Data refreshed September 2026

Top 25 Custom software firms worldwide

Name: Custom software firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 24, 2026 46,592 companies tracked

RevenueBase identified 46,592 custom software firms worldwide as of September 2026 and tracks 645,202 professional contacts across them, including 191,941 with verified work emails and 40,150 with mobile numbers. The United States is the largest market and London the largest hub.

This list covers custom software firms 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 24, 2026. Country and city lists for custom software firms 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 24, 2026 86% judged on-target in blind review

46,592Companies

645,202Contacts tracked

191,941Verified emails

40,150Mobile numbers

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The 25 largest custom software firms worldwide

Ranked by team size

Top 25 of 46,592 custom software firms worldwide, ranked by team size, largest first. Data refreshed Sep 24, 2026. RevenueBase Smart Search rates how each company's information relates to custom software firms: 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	Softtek	Partial evidence	Monterrey, MexicoHQ checked Sep 24, 2026	10001+	13,490 contacts →
	Partial evidence “At Softtek, we drive the strategic development of our clients through software engineering.” Source: RevenueBase Database · checked Sep 24, 2026
2	Luxoft	Strong evidence	Zug, SwitzerlandHQ checked Sep 24, 2026	10001+	11,471 contacts →
	Strong evidence “Luxoft, a DXC Technology Company (NYSE: DXC), is a digital strategy and software engineering firm providing bespoke technology solutions that drive business change for customers…” Source: RevenueBase Database · checked Sep 24, 2026
3	Endava	Indirect evidence	London, United KingdomHQ checked Sep 24, 2026	10001+	9,653 contacts →
	Indirect evidence “For over two decades, we have been harnessing technology to drive meaningful change.” Source: RevenueBase Database · checked Sep 24, 2026
4	R Systems	Partial evidence	El Dorado Hills, CA, United StatesHQ checked Sep 24, 2026	5,001-10,000	7,360 contacts →
	Partial evidence “RSI is a trusted software engineering and digital transformation services partner to global enterprises navigating technological change.” Source: RevenueBase Database · checked Sep 24, 2026
5	Epicor	Indirect evidence	Austin, TX, United StatesHQ checked Sep 24, 2026	1,001-5,000	5,802 contacts →
	Indirect evidence “We’re here for the hard-working businesses that keep the world turning.” Source: RevenueBase Database · checked Sep 24, 2026
6	SII Poland	Indirect evidence	Warszawa, PolandHQ checked Sep 24, 2026	5,001-10,000	5,519 contacts →
	Indirect evidence “With over 7 500 Power People, Sii is Poland’s #1 partner for technology consulting, AI-driven digital transformation, engineering, and business services, empowering companies to…” Source: RevenueBase Database · checked Sep 24, 2026
7	Dataart	Partial evidence	New York, NY, United StatesHQ checked Sep 24, 2026	5,001-10,000	5,249 contacts →
	Partial evidence “DataArt is a global software engineering firm that delivers breakthrough data, analytics, and AI platforms for the world’s most demanding organizations.” Source: RevenueBase Database · checked Sep 24, 2026
8	Software AG	Partial evidence	Darmstadt, GermanyHQ checked Sep 24, 2026	n/a	4,127 contacts →
	Partial evidence “Software AG has been helping enterprises run and evolve their core business applications for over 50 years.” Source: RevenueBase Database · checked Sep 24, 2026
9	Andersen LAB	Partial evidence	Warsaw, PolandHQ checked Sep 24, 2026	1,001-5,000	3,628 contacts →
	Partial evidence “Andersen – your global software development partner Andersen is a global software development company with over 18 years of experience supporting businesses worldwide in their…” Source: RevenueBase Database · checked Sep 24, 2026
10	Iris Software INC	Partial evidence	Edison, NJ, United StatesHQ checked Sep 24, 2026	1,001-5,000	3,421 contacts →
	Partial evidence “Iris Software has been a trusted software engineering partner to several Fortune 500 companies for over three decades.” Source: RevenueBase Database · checked Sep 24, 2026
11	Chetu, INC	Indirect evidence	Sunrise, FL, United StatesHQ checked Sep 24, 2026	1,001-5,000	2,943 contacts →
	Indirect evidence “Chetu is your seamless backend technology partner, helping startups, SMBs, and Fortune companies accelerate development of desktop, mobile, and web apps with on-demand developers…” Source: RevenueBase Database · checked Sep 24, 2026
12	People Tech Group INC	Indirect evidence	Redmond, WA, United StatesHQ checked Sep 24, 2026	1,001-5,000	2,434 contacts →
	Indirect evidence “People Tech Group is a leading Enterprise Solutions, Digital Transformation, Data Intelligence, and Modern Operation services provider.” Source: RevenueBase Database · checked Sep 24, 2026
13	ELEKS	Partial evidence	Tallinn, EstoniaHQ checked Sep 24, 2026	1,001-5,000	1,878 contacts →
	Partial evidence “ELEKS, a trusted partner for guaranteed software engineering excellence, quality, and transparency every step of the way.” Source: RevenueBase Database · checked Sep 24, 2026
14	Exadel	Partial evidence	Walnut Creek, CA, United StatesHQ checked Sep 24, 2026	1,001-5,000	1,874 contacts →
	Partial evidence “Exadel is a leading global software consulting and development company that looks beyond the code to maximize the technology-driven business impact our partners want to make.” Source: RevenueBase Database · checked Sep 24, 2026
15	Fincons Group	Indirect evidence	Vimercate, ItalyHQ checked Sep 24, 2026	1,001-5,000	1,870 contacts →
	Indirect evidence “With more than 40 years of experience in IT Business Consulting and System Integration, Fincons Group partners with clients to support business growth through innovation.” Source: RevenueBase Database · checked Sep 24, 2026
16	Entelect	Indirect evidence	Melrose Arch, South AfricaHQ checked Sep 24, 2026	1,001-5,000	1,803 contacts →
	Indirect evidence “Since 2001, Entelect has been at the forefront of business transformation, leveraging cutting-edge technology to propel companies from good to great.” Source: RevenueBase Database · checked Sep 24, 2026
17	Itransition Group	Partial evidence	Decatur, GA, United StatesHQ checked Sep 24, 2026	1,001-5,000	1,664 contacts →
	Partial evidence “Founded in 1998, Itransition is a global software engineering and IT consulting company with engineers supporting clients across 40 countries.” Source: RevenueBase Database · checked Sep 24, 2026
18	Leverx	Indirect evidence	Miami, FL, United StatesHQ checked Sep 24, 2026	1,001-5,000	1,632 contacts →
	Indirect evidence “LeverX is an SAP Gold Partner, SAP Global Strategic Supplier, and enterprise solutions provider for businesses worldwide, including companies from the Fortune 500 list.” Source: RevenueBase Database · checked Sep 24, 2026
19	Dotsquares	Indirect evidence	London, United KingdomHQ checked Sep 24, 2026	501-1,000	1,581 contacts →
	Indirect evidence “We leverage the latest web and mobile technologies to build, grow and support your business.” Source: RevenueBase Database · checked Sep 24, 2026
20	Sigma Software Group	Strong evidence	Stockholm, SwedenHQ checked Sep 24, 2026	1,001-5,000	1,566 contacts →
	Strong evidence “Sigma Software Group, an award-winning and trusted IT partner, has been serving customers for over 24 years, providing comprehensive IT solutions to various businesses, ranging…” Source: RevenueBase Database · checked Sep 24, 2026
21	Evosoft	Strong evidence	Nürnberg, GermanyHQ checked Sep 24, 2026	1,001-5,000	1,519 contacts →
	Strong evidence “The evosoft Group is an international system house that has developed custom-made software solutions since 1995.” Source: RevenueBase Database · checked Sep 24, 2026
22	Mobile Programming	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 24, 2026	1,001-5,000	1,462 contacts →
	Partial evidence “Mobile Programming LLC was started with the mission to provide “Economic as well as Efficient” software solutions.” Source: RevenueBase Database · checked Sep 24, 2026
23	Pragma	Strong evidence	Miami, FL, United StatesHQ checked Sep 24, 2026	1,001-5,000	1,416 contacts →
	Strong evidence “Pragma is a Custom Software Development and Digital Transformation company founded 30 years ago to improve people's lives by transforming businesses.” Source: RevenueBase Database · checked Sep 24, 2026
24	ICC	Indirect evidence	Columbus, OH, United StatesHQ checked Sep 24, 2026	501-1,000	1,416 contacts →
	Indirect evidence “User First.” Source: RevenueBase Database · checked Sep 24, 2026
25	Trigent Software INC	Partial evidence	Southborough, MA, United StatesHQ checked Sep 24, 2026	1,001-5,000	1,379 contacts →
	Partial evidence “Trigent is a global leader in software solutions, headquartered in Southborough, MA, with development centers in Boston, Bangalore.” Source: RevenueBase Database · checked Sep 24, 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: custom software firms. 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 custom software firms.
Partial evidence: Its own public description names part of custom software firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name custom software firms. 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 46,592 custom software firms worldwide

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Custom software firms worldwide at a glance

As of Sep 24, 2026

29.7%Verified-email coverage

6.2%Mobile-number coverage

13.8Average contacts per company

1-10Median size (employees)

3.3%Largest-city concentration · London

Sep 24, 2026Page data refreshed

Companies by employee count

1-10

26,532

11-50

14,569

51-200

4,191

201-500

797

501-1,000

223

1,001-5,000

125

5,001-10,000

10001+

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 custom software firms, 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: 45 countries, largest first: the United States, the United Kingdom, Brazil, Germany, Canada, France, Italy, Australia, Spain, Poland and 35 more. Country and city lists for custom software firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “custom software firms”. 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 custom software firms), 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 custom software firms, 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, 191,941 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 24, 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.

Custom software firms by location

244 lists · largest first

Every Custom software firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 custom software firms, 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 custom software firms are there worldwide?

RevenueBase identified 46,592 custom software firms 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?

Softtek, headquartered in Monterrey, tops this list with the largest team on record.

Which country has the most custom software firms?

The United States leads with 12,953 companies, followed by the United Kingdom (4,078) and Brazil (3,506). Every custom software firms list by country and city is linked on this page.

Which city has the most custom software firms?

London leads with 1544 headquartered companies, followed by Sao Paulo (670) and New York (582).

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 191,941 verified decision-maker contacts tracked across these 46,592 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 24, 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.