Company lists · Data refreshed September 2026

Top 25 Legacy system modernization companies based in France

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

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 1,761 companies tracked

RevenueBase identified 1,761 legacy system modernization companies headquartered in France as of September 2026 and tracks 387,102 professional contacts across them, including 160,581 with verified work emails. Paris is the largest hub.

This list covers legacy system modernization companies headquartered in France, 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

1,761Companies

387,102Contacts tracked

160,581Verified emails

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The 25 largest legacy system modernization companies based in France

Ranked by team size

Top 25 of 1,761 legacy system modernization companies based in France, 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 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	Capgemini	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	10001+	284,286 contacts →
	Indirect evidence “Capgemini is an AI-powered global business and technology transformation partner, delivering tangible business value.” Source: RevenueBase Database · checked Sep 20, 2026
2	Sopra Steria	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	10001+	36,960 contacts →
	Indirect evidence “Sopra Steria, a major Tech player in Europe with employees in nearly 30 countries, is recognised for its consulting, digital services and solutions.” Source: RevenueBase Database · checked Sep 20, 2026
3	Wavestone	Indirect evidence	100-101 Terrasse Boieldieu, FranceHQ checked Sep 20, 2026	1,001-5,000	6,190 contacts →
	Indirect evidence “Wavestone is a leading consulting firm operating at the intersection of business and technology.” Source: RevenueBase Database · checked Sep 20, 2026
4	Groupe SII	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	10001+	4,928 contacts →
	Indirect evidence “Le groupe SII est une société d’ingénierie et de conseil en technologies (ICT) et une entreprise de services numériques (ESN) créée en 1979 par Bernard HUVÉ, ingénieur de…” Source: RevenueBase Database · checked Sep 20, 2026
5	Scalian	Indirect evidence	Neuilly-sur-seine, FranceHQ checked Sep 20, 2026	5,001-10,000	2,860 contacts →
	Indirect evidence “Established in 1989, the Scalian Group has nearly employees in France and abroad.” Source: RevenueBase Database · checked Sep 20, 2026
6	Experis France	Indirect evidence	Nantes, FranceHQ checked Sep 20, 2026	1,001-5,000	2,167 contacts →
	Indirect evidence “Experis accompagne les DSI dans leurs projets de transformation digitale en déployant des solutions innovantes en matière de Services et de Talent IT afin de répondre aux besoins…” Source: RevenueBase Database · checked Sep 20, 2026
7	VISEO	Indirect evidence	Boulogne-billancourt, FranceHQ checked Sep 20, 2026	1,001-5,000	1,989 contacts →
	Indirect evidence “VISEO is a global digital and business consulting company that assists its clients with their transformation journeys using advanced technology and industry expertise.” Source: RevenueBase Database · checked Sep 20, 2026
8	Keyrus	Partial evidence	Levallois-perret, FranceHQ checked Sep 20, 2026	1,001-5,000	1,964 contacts →
	Partial evidence “At Keyrus, we help organizations move from experimental AI to industrialized AI, from isolated agents to orchestrated systems, and from insight to execution.” Source: RevenueBase Database · checked Sep 20, 2026
9	Infotel	Indirect evidence	Neuilly-sur-seine, FranceHQ checked Sep 20, 2026	1,001-5,000	1,735 contacts →
	Indirect evidence “Infotel accompagne les directions Informatiques et Métiers des grandes entreprises depuis 45 ans (Airbus, Air France, PSA, BNP Paribas, Banque de France ou encore BPCE, etc.).” Source: RevenueBase Database · checked Sep 20, 2026
10	Prodware	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	1,001-5,000	1,394 contacts →
	Indirect evidence “At Prodware, we believe that Trust, Audacity, and Passion are the driving forces behind meaningful digital transformation.” Source: RevenueBase Database · checked Sep 20, 2026
11	NIJI	Indirect evidence	Issy-les-moulineaux, FranceHQ checked Sep 20, 2026	1,001-5,000	1,256 contacts →
	Indirect evidence “Créée en septembre 2001, Niji est une société de conseil, de design et de mise en œuvre technologique, entièrement dédiée à la transformation numérique des entreprises et des…” Source: RevenueBase Database · checked Sep 20, 2026
12	Neosoft	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	1,001-5,000	1,240 contacts →
	Indirect evidence “Néosoft est un groupe indépendant de conseil en transformation digitale de 1800 collaborateurs réunis en communautés d’experts : Conseil & Agilité, Cybersécurité, Data, DevOps…” Source: RevenueBase Database · checked Sep 20, 2026
13	Randstad Digital France	Indirect evidence	Issy Les Moulineaux, FranceHQ checked Sep 20, 2026	10001+	924 contacts →
	Indirect evidence “Randstad Digital is a trusted digital enablement partner that facilitates the rapid transformation of businesses by providing global talent, production capabilities, and…” Source: RevenueBase Database · checked Sep 20, 2026
14	Acensi	Indirect evidence	Courbevoie, FranceHQ checked Sep 20, 2026	1,001-5,000	844 contacts →
	Indirect evidence “You will be part of ACENSI network: 1650 co-workers involved in IS transformation projects at our clients through our multisectoral expertise.” Source: RevenueBase Database · checked Sep 20, 2026
15	Micropole	Indirect evidence	Levallois-perret, FranceHQ checked Sep 20, 2026	1,001-5,000	795 contacts →
	Indirect evidence “An international consulting group specialized in corporate transformation through Data, MICROPOLE partners its clients through a global approach: ‘Data Driven‘ Strategy, Cloud…” Source: RevenueBase Database · checked Sep 20, 2026
16	Visiativ	Indirect evidence	Lyon, FranceHQ checked Sep 20, 2026	1,001-5,000	750 contacts →
	Indirect evidence “Through innovation and digitalisation, Visiativ delivers smarter ways of working that help businesses become more agile, efficient and collaborative.” Source: RevenueBase Database · checked Sep 20, 2026
17	Groupe Intm	Indirect evidence	Levallois-perret, FranceHQ checked Sep 20, 2026	1,001-5,000	714 contacts →
	Indirect evidence “Le Groupe INTM est une société de conseil et de services en ingénierie numérique, dont le positionnement s'inscrit depuis plusieurs années dans une volonté de proximité, d'écoute…” Source: RevenueBase Database · checked Sep 20, 2026
18	Catamania	Indirect evidence	Saint-herblain, FranceHQ checked Sep 20, 2026	1,001-5,000	696 contacts →
	Indirect evidence “Depuis plus de 25 ans, Catamania fait partie des Entreprises de Services du Numérique dynamiques et innovantes qui s’appuie sur ses expertises métiers, techniques et…” Source: RevenueBase Database · checked Sep 20, 2026
19	Intalio	Indirect evidence	Fontenay-sous-bois, FranceHQ checked Sep 20, 2026	501-1,000	586 contacts →
	Indirect evidence “With more than 30 years of expertise in the industry, Intalio -(previously known as Everteam Global Services) aims at accelerating an organization’s business evolution by offering…” Source: RevenueBase Database · checked Sep 20, 2026
20	Klanik	Indirect evidence	Marseille, FranceHQ checked Sep 20, 2026	501-1,000	585 contacts →
	Indirect evidence “KLANIK is a consulting company specialized in IT Engineering which accompanies its partners in their digital and technological projects.” Source: RevenueBase Database · checked Sep 20, 2026
21	Alteca	Indirect evidence	Villeurbanne, FranceHQ checked Sep 20, 2026	501-1,000	574 contacts →
	Indirect evidence “Alteca is a French IT & Digital services company created in 1996.” Source: RevenueBase Database · checked Sep 20, 2026
22	Arkance	Indirect evidence	Saint-denis, FranceHQ checked Sep 20, 2026	1,001-5,000	563 contacts →
	Indirect evidence “ARKANCE is a global partner in digital and operational transformation for the architecture, engineering, construction, and manufacturing industries.” Source: RevenueBase Database · checked Sep 20, 2026
23	Meritis	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	501-1,000	549 contacts →
	Indirect evidence “Meritis is a consulting firm specializing in the digital transformation of organizations, co-founded in 2007 by Sébastien Videment.” Source: RevenueBase Database · checked Sep 20, 2026
24	DCS Easyware	Indirect evidence	Lyon, FranceHQ checked Sep 20, 2026	1,001-5,000	532 contacts →
	Indirect evidence “Filiale du Groupe SYNERGIE, DCS SYNERGIE GROUP capitalise sur son histoire pour accompagner chaque jour les enjeux IT de ses clients.” Source: RevenueBase Database · checked Sep 20, 2026
25	Ippon Technologies	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	201-500	510 contacts →
	Indirect evidence “USING OUR COLLECTIVE ENERGY FOR POSITIVE TECHNOLOGY Ippon is a consulting and expertise firm, who is convinced that technology is a source of progress for society.” 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 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 system modernization companies.
Partial evidence: Its own public description names part of legacy system 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 system 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 1,761 legacy system modernization companies based in France

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Legacy system modernization companies based in France at a glance

As of Sep 20, 2026

41.5%Verified-email coverage

219.8Average contacts per company

1-10Median size (employees)

30.8%Largest-city concentration · Paris

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

1,000

11-50

473

51-200

173

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 France, so it is reported there. Company counts and contact totals on this page are exact for France, over 1,761 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 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 France whose own description of what they do matches “legacy system 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 system 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 system modernization companies, and records with no verified work email. Companies headquartered outside France 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, 160,581 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 companies by metro

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 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 system modernization companies are there based in France?

RevenueBase identified 1,761 legacy system modernization companies headquartered in France 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?

Capgemini, headquartered in Paris, tops this list with the largest team on record.

Which city has the most legacy system modernization companies?

Paris leads with 542 headquartered companies, followed by Lyon (63) and Lille (32).

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 160,581 verified decision-maker contacts tracked across these 1,761 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.