Company lists · Data refreshed September 2026

Top 23 Legacy system modernization firms based in Warsaw, Poland

Name: Legacy system modernization firms based in Warsaw, Poland
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 46 companies tracked

RevenueBase identified 46 legacy system modernization firms headquartered in Warsaw, Poland as of September 2026 and tracks 6,174 professional contacts across them, including 2,449 with verified work emails. Warsaw is the largest hub.

This list covers legacy system modernization firms headquartered in Warsaw, Poland, 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

46Companies

6,174Contacts tracked

2,449Verified emails

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The 23 largest legacy system modernization firms based in Warsaw, Poland

Ranked by team size

Top 23 of 46 legacy system modernization firms based in Warsaw, Poland, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to legacy system modernization 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	Andersen LAB	Indirect evidence	Warsaw, PolandHQ checked Sep 20, 2026	1,001-5,000	3,628 contacts →
	Indirect 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 20, 2026
2	Britenet	Indirect evidence	Warsaw, PolandHQ checked Sep 20, 2026	1,001-5,000	639 contacts →
	Indirect evidence “With 18+ years of elite software development expertise, we've established ourselves as a leading European IT consultancy specializing in analytics-powered digital transformation.” Source: RevenueBase Database · checked Sep 20, 2026
3	Sygnity S.A	Indirect evidence	Warsaw, PolandHQ checked Sep 20, 2026	1,001-5,000	567 contacts →
	Indirect evidence “W Sygnity już od 30 lat wspieramy biznes i państwo w cyfrowej transformacji, pracując dla największych firm i najważniejszych instytucji publicznych w Polsce.” Source: RevenueBase Database · checked Sep 20, 2026
4	The Software House	Indirect evidence	Warsaw, PolandHQ checked Sep 20, 2026	201-500	279 contacts →
	Indirect evidence “12+ years of custom software development centered on client satisfaction.” Source: RevenueBase Database · checked Sep 20, 2026
5	Pretius	Indirect evidence	Warsaw, PolandHQ checked Sep 20, 2026	51-200	161 contacts →
	Indirect evidence “Pretius is a software development company that specializes in crafting custom software solutions and delivering tangible business value.” Source: RevenueBase Database · checked Sep 20, 2026
6	Innergo	Indirect evidence	Warsaw, PolandHQ checked Sep 20, 2026	51-200	110 contacts →
	Indirect evidence “INNERGO to dostawca i integrator rozwiązań wspierających cyfrową transformację Twojej organizacji.” Source: RevenueBase Database · checked Sep 20, 2026
7	Algoteque Innovation HUB	Indirect evidence	Warsaw, PolandHQ checked Sep 20, 2026	201-500	84 contacts →
	Indirect evidence “Algoteque is a strategic IT delivery partner supporting organizations in scaling engineering teams and modernizing platforms, with a strong focus on stability, quality, and…” Source: RevenueBase Database · checked Sep 20, 2026
8	IT Squad	Indirect evidence	Warsaw, PolandHQ checked Sep 20, 2026	51-200	60 contacts →
	Indirect evidence “We specialize in two areas: digital transformation and project rescue.” Source: RevenueBase Database · checked Sep 20, 2026
9	Startup House	Indirect evidence	Warsaw, PolandHQ checked Sep 20, 2026	51-200	47 contacts →
	Indirect evidence “Startup House is an end-to-end digital & AI transformation partner for enterprises.” Source: RevenueBase Database · checked Sep 20, 2026
10	Dynevo	Indirect evidence	Warsaw, PolandHQ checked Sep 20, 2026	11-50	37 contacts →
	Indirect evidence “DYNEVO GROUP is a reputable IT solutions provider that enhances the efficiency, productivity, and security of your business.” Source: RevenueBase Database · checked Sep 20, 2026
11	Mindbox SA	Indirect evidence	Warsaw, PolandHQ checked Sep 20, 2026	201-500	30 contacts →
	Indirect evidence “ENG Creating an inspiring place to thrive for the talented, we use their expertise and courage to introduce the technology of the future into your business- This is the foundation…” Source: RevenueBase Database · checked Sep 20, 2026
12	3qcode	Indirect evidence	Warsaw, PolandHQ checked Sep 20, 2026	11-50	27 contacts →
	Indirect evidence “3Q oznacza Quick, Quality & Quest i są to wartości które nas charakteryzują stanowiąc DNA naszej firmy.” Source: RevenueBase Database · checked Sep 20, 2026
13	DAT Computer Concepts	Indirect evidence	Warsaw, PolandHQ checked Sep 20, 2026	11-50	19 contacts →
	Indirect evidence “WE DELIVER BEST SOLUTIONS - DAT Computer Concepts is Digital Business Transformation consulting company.” Source: RevenueBase Database · checked Sep 20, 2026
14	Symmetry Sp. Z O.O	Indirect evidence	Warsaw, PolandHQ checked Sep 20, 2026	51-200	18 contacts →
	Indirect evidence “Symmetry is a digital transformation, IT integration and software development company that delivers cutting- edge solutions.” Source: RevenueBase Database · checked Sep 20, 2026
15	SDD Technology	Indirect evidence	Warsaw, PolandHQ checked Sep 20, 2026	51-200	17 contacts →
	Indirect evidence “With a decade of expertise in custom software development and digital transformation, SDD Technology is a trailblazer in empowering businesses worldwide.” Source: RevenueBase Database · checked Sep 20, 2026
16	Codino	Indirect evidence	Warsaw, PolandHQ checked Sep 20, 2026	11-50	14 contacts →
	Indirect evidence “Codino is a software and product development company that specializes in using advanced technology to enhance your business, focusing on transforming data and utilizing Artificial…” Source: RevenueBase Database · checked Sep 20, 2026
17	Limitless Technologies	Indirect evidence	Warsaw, PolandHQ checked Sep 20, 2026	51-200	10 contacts →
	Indirect evidence “Zakładając Limitless Technologies, stworzyliśmy przestrzeń dla przedsiębiorców, dzięki której wejdą oni na ścieżkę cyfrowej transformacji.” Source: RevenueBase Database · checked Sep 20, 2026
18	Evergo	Indirect evidence	Warsaw, PolandHQ checked Sep 20, 2026	11-50	9 contacts →
	Indirect evidence “Evergo is a team of IT practitioners with solid global business experience in large organizations.” Source: RevenueBase Database · checked Sep 20, 2026
19	Camo Code Sp. Z O.O	Indirect evidence	Warsaw, PolandHQ checked Sep 20, 2026	11-50	5 contacts →
	Indirect evidence “We are a group of experienced people with a proven track record in the development of IT solutions.” Source: RevenueBase Database · checked Sep 20, 2026
20	Digital Enterprise Consulting	Indirect evidence	Warsaw, PolandHQ checked Sep 20, 2026	11-50	2 contacts →
	Indirect evidence “Dynamically growing company founded by professionals with over 10 years of experience in sales and delivery working for world's largest IT integrators.” Source: RevenueBase Database · checked Sep 20, 2026
21	Inteos Sp. Z O.O	Indirect evidence	Warsaw, PolandHQ checked Sep 20, 2026	1-10	2 contacts →
	Indirect evidence “Inteos' mission is to support its clients in achieving competitive advantage by providing the highest quality services and innovative IT solutions in the field of processing and…” Source: RevenueBase Database · checked Sep 20, 2026
22	Skalar Global	Indirect evidence	Warsaw, PolandHQ checked Sep 20, 2026	11-50	1 contacts →
	Indirect evidence “SKALAR GLOBAL is a forward-thinking technology company dedicated to delivering innovative solutions and consulting services to businesses worldwide.” Source: RevenueBase Database · checked Sep 20, 2026
23	Cloudas	Indirect evidence	Warsaw, PolandHQ checked Sep 20, 2026	1-10	1 contacts →
	Indirect evidence “Cloudas offers professional digital transformation services and consulting on cost optimization.” 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 system modernization 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 legacy system modernization firms.
Partial evidence: Its own public description names part of legacy system modernization firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name legacy system modernization 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 23 of 46 legacy system modernization firms based in Warsaw, Poland

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Legacy system modernization firms based in Warsaw, Poland at a glance

As of Sep 20, 2026

39.7%Verified-email coverage

134.2Average contacts per company

11-50Median size (employees)

100.0%Largest-city concentration · Warsaw

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

Email recency for this list is measured across the whole Poland list rather than for Warsaw, so it is reported there. Company counts and contact totals on this page are exact for Warsaw, over 46 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 system modernization 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.
What qualifies: Companies headquartered in Warsaw, Poland whose own description of what they do matches “legacy system modernization 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 legacy system modernization 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 legacy system modernization firms, and records with no verified work email. Companies headquartered outside Warsaw 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, 2,449 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 system modernization firms by metro in Poland

Legacy system modernization firms in Warsaw46
Legacy system modernization firms in Warszawa33
Legacy system modernization firms in Wroclaw26

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 system modernization 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 legacy system modernization firms are there based in Warsaw, Poland?

RevenueBase identified 46 legacy system modernization firms headquartered in Warsaw, Poland 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?

Andersen LAB, headquartered in Warsaw, tops this list with the largest team on record.

Which city has the most legacy system modernization firms?

Warsaw leads with 46 headquartered companies, followed by Warszawa (33) and Wroclaw (26).

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 2,449 verified decision-maker contacts tracked across these 46 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.