Company lists · Data refreshed September 2026

Top 25 Legacy system modernization firms based in Poland

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

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 223 companies tracked

RevenueBase identified 223 legacy system modernization firms headquartered in Poland as of September 2026 and tracks 15,274 professional contacts across them, including 7,186 with verified work emails. Warsaw is the largest hub.

This list covers legacy system modernization firms headquartered in 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

223Companies

15,274Contacts tracked

7,186Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest legacy system modernization firms based in Poland

Ranked by team size

Top 25 of 223 legacy system modernization firms based in 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	SII Poland	Indirect evidence	Warszawa, PolandHQ checked Sep 20, 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 20, 2026
2	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
3	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
4	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
5	Luxoft Poland	Indirect evidence	Kraków, PolandHQ checked Sep 20, 2026	10001+	361 contacts →
	Indirect 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 20, 2026
6	Univio	Indirect evidence	Wroclaw, PolandHQ checked Sep 20, 2026	201-500	320 contacts →
	Indirect evidence “Univio has been realizing digital commerce transformation solutions with over 500+ projects completed to date.” Source: RevenueBase Database · checked Sep 20, 2026
7	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
8	Euvic IT SA	Indirect evidence	Kraków, PolandHQ checked Sep 20, 2026	501-1,000	223 contacts →
	Indirect evidence “itWORKS is an IT company which addresses its offer to IT and business departments.” Source: RevenueBase Database · checked Sep 20, 2026
9	BPX	Indirect evidence	Wroclaw, PolandHQ checked Sep 20, 2026	201-500	202 contacts →
	Indirect evidence “BPX S.A.” Source: RevenueBase Database · checked Sep 20, 2026
10	Cshark	Indirect evidence	Wrocław, PolandHQ checked Sep 20, 2026	201-500	186 contacts →
	Indirect evidence “CSHARK is a technology and advisory partner for building, modernizing and innovating software and infrastructure ecosystems.” Source: RevenueBase Database · checked Sep 20, 2026
11	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
12	Opteam S.A	Indirect evidence	Jasionka, PolandHQ checked Sep 20, 2026	51-200	153 contacts →
	Indirect evidence “We help companies and institutions in digitizing management processes.” Source: RevenueBase Database · checked Sep 20, 2026
13	E-Point	Indirect evidence	Warszawa, PolandHQ checked Sep 20, 2026	51-200	127 contacts →
	Indirect evidence “e-point is one of Poland’s top tech companies.” Source: RevenueBase Database · checked Sep 20, 2026
14	Holisticon Poland	Indirect evidence	Wrocław, PolandHQ checked Sep 20, 2026	201-500	122 contacts →
	Indirect evidence “Holisticon Poland is part of Nexer Group – a global tech company with strong roots in Swedish entrepreneurship and innovation.” Source: RevenueBase Database · checked Sep 20, 2026
15	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
16	Infover	Indirect evidence	Kielce, PolandHQ checked Sep 20, 2026	51-200	89 contacts →
	Indirect evidence “INFOVER to zespół specjalistów IT z wieloletnim doświadczeniem w tworzeniu rozwiązań informatycznych od podstaw.” Source: RevenueBase Database · checked Sep 20, 2026
17	Merixstudio	Partial evidence	Poznań, PolandHQ checked Sep 20, 2026	51-200	84 contacts →
	Partial evidence “Global #1 Software Company on Clutch We design, build and modernize digital products, platforms and connected systems for mid-size and enterprise businesses - with AI-augmented…” Source: RevenueBase Database · checked Sep 20, 2026
18	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
19	Onex Group	Indirect evidence	Warszawa, PolandHQ checked Sep 20, 2026	51-200	79 contacts →
	Indirect evidence “Onex Group is a global, certified Microsoft partner.” Source: RevenueBase Database · checked Sep 20, 2026
20	7bulls.com	Indirect evidence	Warsaw, PolandHQ checked Sep 20, 2026	51-200	77 contacts →
	Indirect evidence “We have proven many times that the project implemented by our team requires less time and significantly less investment compared to the competition.” Source: RevenueBase Database · checked Sep 20, 2026
21	Webellian	Indirect evidence	Warsaw, PolandHQ checked Sep 20, 2026	51-200	67 contacts →
	Indirect evidence “Webellian is your trusted partner in your digital an AI transformation journey.” Source: RevenueBase Database · checked Sep 20, 2026
22	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
23	Pearson	Indirect evidence	Wroclaw, PolandHQ checked Sep 20, 2026	51-200	60 contacts →
	Indirect evidence “We are a leading IT company and consulting firm dedicated to delivering innovative solutions and strategic guidance for businesses navigating the digital landscape.” Source: RevenueBase Database · checked Sep 20, 2026
24	Peoplemore	Strong evidence	Kraków, PolandHQ checked Sep 20, 2026	51-200	59 contacts →
	Strong evidence “People More is a software development company focused on - Legacy Systems Modernization- Bespoke Software Development- Team Augmentation.” Source: RevenueBase Database · checked Sep 20, 2026
25	I-Bs.Pl Sp. Z O.O	Indirect evidence	Stalowa Wola, PolandHQ checked Sep 20, 2026	51-200	48 contacts →
	Indirect evidence “I-BS.pl Sp.” 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 25 of 223 legacy system modernization firms based in Poland

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 7,186 reachable decision-makers.

Free signup · no credit card

View the full list →

Legacy system modernization firms based in Poland at a glance

As of Sep 20, 2026

47.0%Verified-email coverage

68.5Average contacts per company

11-50Median size (employees)

20.6%Largest-city concentration · Warsaw

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

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 Poland, so it is reported there. Company counts and contact totals on this page are exact for Poland, over 223 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 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 Poland 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, 7,186 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

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 Poland?

RevenueBase identified 223 legacy system modernization firms headquartered in 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?

SII Poland, headquartered in Warszawa, 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 7,186 verified decision-maker contacts tracked across these 223 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.

Ready to reach these companies? Verified emails and direct dials for all 223 legacy system modernization firms based in Poland. Start with a free account, no credit card.

Download this list →

Related lists

Legacy system modernization firms by geography

Browse the directory

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.