Company lists · Data refreshed September 2026

Top 25 Custom SaaS developers worldwide

Name: Custom SaaS developers worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 21,371 companies tracked

RevenueBase identified 21,371 custom SaaS developers worldwide as of September 2026 and tracks 220,968 professional contacts across them, including 62,705 with verified work emails and 15,315 with mobile numbers. The United States is the largest market and London the largest hub.

This list covers custom SaaS developers 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 custom SaaS developers 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 29, 2026 86% judged on-target in blind review

21,371Companies

220,968Contacts tracked

62,705Verified emails

15,315Mobile numbers

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The 25 largest custom SaaS developers worldwide

Ranked by team size

Top 25 of 21,371 custom SaaS developers worldwide, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to custom SaaS developers: 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	Adesso SE	Indirect evidence	Dortmund, GermanyHQ checked Sep 29, 2026	5,001-10,000	5,332 contacts →
	Indirect evidence “The future belongs to companies that effectively translate agentic AI into value creation.” Source: RevenueBase Database · checked Sep 29, 2026
2	Exadel	Indirect evidence	Walnut Creek, CA, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,874 contacts →
	Indirect 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 29, 2026
3	Dotsquares	Indirect evidence	London, United KingdomHQ checked Sep 29, 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 29, 2026
4	BBD	Indirect evidence	Rosebank, South AfricaHQ checked Sep 29, 2026	1,001-5,000	1,225 contacts →
	Indirect evidence “Welcome to BBD – where experience, innovation and software engineering excellence come together.” Source: RevenueBase Database · checked Sep 29, 2026
5	dev.pro	Indirect evidence	Charlotte, NC, United StatesHQ checked Sep 29, 2026	501-1,000	997 contacts →
	Indirect evidence “Dev.Pro helps innovative technology companies scale their business by leveraging our software engineering expertise to support them every step of the way.” Source: RevenueBase Database · checked Sep 29, 2026
6	Trinetix	Partial evidence	Brentwood, TN, United StatesHQ checked Sep 29, 2026	1,001-5,000	902 contacts →
	Partial evidence “Trinetix is a global custom software development partner that brings ambitious ideas to life.” Source: RevenueBase Database · checked Sep 29, 2026
7	Sysmap Solutions	Partial evidence	São Paulo, BrazilHQ checked Sep 29, 2026	1,001-5,000	888 contacts →
	Partial evidence “SysMap Solutions is a services company devoted to offering technological development to its customers since 1997.” Source: RevenueBase Database · checked Sep 29, 2026
8	PIT Solutions	Indirect evidence	Rapperswil, SwitzerlandHQ checked Sep 29, 2026	501-1,000	858 contacts →
	Indirect evidence “PIT Solutions is a technology-driven digital services provider with a strong people-first culture and a proven track record of delivering meaningful, high-impact solutions.” Source: RevenueBase Database · checked Sep 29, 2026
9	Folio3 Software	Indirect evidence	San Mateo, CA, United StatesHQ checked Sep 29, 2026	501-1,000	846 contacts →
	Indirect evidence “Folio3 is a California based software development company that helps entrepreneurs and large corporations build innovative, world class software solutions by providing offshore…” Source: RevenueBase Database · checked Sep 29, 2026
10	Tanisha Systems, INC	Partial evidence	Boston, MA, United StatesHQ checked Sep 29, 2026	1,001-5,000	844 contacts →
	Partial 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 29, 2026
11	Xtglobal, INC	Indirect evidence	Plano, TX, United StatesHQ checked Sep 29, 2026	501-1,000	841 contacts →
	Indirect evidence “Founded in 1998, XTGlobal, Inc.” Source: RevenueBase Database · checked Sep 29, 2026
12	NSI	Indirect evidence	Belgique, BelgiumHQ checked Sep 29, 2026	1,001-5,000	816 contacts →
	Indirect evidence “Votre partenaire digital de proximité Chez NSI nous vous accompagnons de A à Z dans la création de solutions IT sur-mesure, adaptées à vos besoins uniques.” Source: RevenueBase Database · checked Sep 29, 2026
13	Codeclouds	Indirect evidence	Wellington, New ZealandHQ checked Sep 29, 2026	501-1,000	727 contacts →
	Indirect evidence “CodeClouds specializes in delivering scalable, robust solutions for modern businesses of all sizes including enterprise clients.” Source: RevenueBase Database · checked Sep 29, 2026
14	Paradigma Digital	Indirect evidence	Pozuelo De Alarcón, SpainHQ checked Sep 29, 2026	501-1,000	692 contacts →
	Indirect evidence “At Paradigma, we have a habit: we commit.” Source: RevenueBase Database · checked Sep 29, 2026
15	Programmers Force	Indirect evidence	Lahore, PakistanHQ checked Sep 29, 2026	1,001-5,000	671 contacts →
	Indirect evidence “Programmers Force has been established with an aim to facilitate your business needs with innovative and intelligent solutions.” Source: RevenueBase Database · checked Sep 29, 2026
16	Team Rockstars IT	Indirect evidence	Den Bosch, NetherlandsHQ checked Sep 29, 2026	501-1,000	640 contacts →
	Indirect evidence “Bij Team Rockstars IT draait alles om impact.” Source: RevenueBase Database · checked Sep 29, 2026
17	ABRA	Indirect evidence	Ra'anana, IsraelHQ checked Sep 29, 2026	1,001-5,000	590 contacts →
	Indirect evidence “abra is composed of over experts delivering cutting-edge tech solutions across BI & AI, ERP, CRM, Cyber, Cloud & Infrastructure, R&D, Web & Mobile, e-Commerce, and more.” Source: RevenueBase Database · checked Sep 29, 2026
18	SAM Solutions	Indirect evidence	Gilching, GermanyHQ checked Sep 29, 2026	501-1,000	563 contacts →
	Indirect evidence “Welcome to SaM Solutions – a software development company that drives digital transformation with the help of its international team of seasoned engineers and best-in-class…” Source: RevenueBase Database · checked Sep 29, 2026
19	Exsitec	Partial evidence	SwedenHQ checked Sep 29, 2026	501-1,000	552 contacts →
	Partial evidence “Exsitec are experts in digital solutions that make a difference in the customer's business.” Source: RevenueBase Database · checked Sep 29, 2026
20	Fingent	Partial evidence	New York, NY, United StatesHQ checked Sep 29, 2026	501-1,000	551 contacts →
	Partial evidence “Fingent, an award-winning and ISO 27001:2013-certified custom software development company, is a trusted partner for businesses seeking strategic IT solutions.” Source: RevenueBase Database · checked Sep 29, 2026
21	Droisys	Indirect evidence	Las Vegas, NV, United StatesHQ checked Sep 29, 2026	201-500	544 contacts →
	Indirect evidence “Droisys is an innovation technology company, with a reputation of delivering top engineering projects and teams to meet, execute, and solve complex business challenges & deliver…” Source: RevenueBase Database · checked Sep 29, 2026
22	Enterprise Solutions INC	Indirect evidence	Warrenville, IL, United StatesHQ checked Sep 29, 2026	501-1,000	540 contacts →
	Indirect evidence “Enterprise Solutions, Inc.” Source: RevenueBase Database · checked Sep 29, 2026
23	Softura	Indirect evidence	Farmington Hills, MI, United StatesHQ checked Sep 29, 2026	201-500	534 contacts →
	Indirect evidence “Softura is an organization that specializes in providing state-of-the-art software solutions on a wide range of platforms to simplify any un-scalable process.” Source: RevenueBase Database · checked Sep 29, 2026
24	STG	Indirect evidence	Salt Lake City, UT, United StatesHQ checked Sep 29, 2026	51-200	508 contacts →
	Indirect evidence “Your Business Technology Partner.” Source: RevenueBase Database · checked Sep 29, 2026
25	Codecentric AG	Indirect evidence	Solingen, GermanyHQ checked Sep 29, 2026	501-1,000	490 contacts →
	Indirect evidence “Seit zwei Dekaden entwickelt die codecentric AG moderne, individuelle Software.” Source: RevenueBase Database · checked Sep 29, 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 SaaS developers. 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 SaaS developers.
Partial evidence: Its own public description names part of custom SaaS developers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name custom SaaS developers. 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 21,371 custom SaaS developers worldwide

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Custom SaaS developers worldwide at a glance

As of Sep 29, 2026

28.4%Verified-email coverage

6.9%Mobile-number coverage

10.3Average contacts per company

1-10Median size (employees)

3.0%Largest-city concentration · London

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

12,754

11-50

6,495

51-200

1,675

201-500

272

501-1,000

1,001-5,000

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 SaaS developers, 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: 42 countries, largest first: the United States, the United Kingdom, Brazil, Germany, Canada, France, Italy, Australia, Spain, South Africa and 32 more. Country and city lists for custom SaaS developers are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “custom SaaS developers”. 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 SaaS developers), 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 SaaS developers, 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, 62,705 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.

Custom SaaS developers by location

137 lists · largest first

Every Custom SaaS developers 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 SaaS developers, 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 SaaS developers are there worldwide?

RevenueBase identified 21,371 custom SaaS developers 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?

Adesso SE, headquartered in Dortmund, tops this list with the largest team on record.

Which country has the most custom SaaS developers?

The United States leads with 6,040 companies, followed by the United Kingdom (1,882) and Brazil (1,614). Every custom SaaS developers list by country and city is linked on this page.

Which city has the most custom SaaS developers?

London leads with 643 headquartered companies, followed by Sao Paulo (325) and New York (241).

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 62,705 verified decision-maker contacts tracked across these 21,371 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.