Company lists · Data refreshed September 2026

Top 25 Legacy system modernization consultancies based in France

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

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 483 companies tracked

RevenueBase identified 483 company matches for legacy system modernization consultancies associated with France as of September 2026 and tracks 5,761 professional contacts across them, including 1,997 with verified work emails. Paris is the largest hub.

This list covers company matches for legacy system modernization consultancies associated with France, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 28, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Sep 28, 2026 How this list was built

483Companies

5,761Contacts tracked

1,997Verified emails

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The 25 largest legacy system modernization consultancies based in France

Ranked by team size

Top 25 of 483 company matches for legacy system modernization consultancies based in France, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 28, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Infotel	Exact match	Neuilly-sur-seine, FranceHQ recorded Sep 28, 2026	1,001-5,000	1,735 contacts →
	Exact match “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.).” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
2	Adservio	Exact match	Puteaux, FranceHQ recorded Sep 28, 2026	201-500	161 contacts →
	Exact match “We build a resilient digital experience.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
3	RBI	Exact match	Rennes, FranceHQ recorded Sep 28, 2026	11-50	133 contacts →
	Exact match “Dans un monde où tout s’accélère, la transformation numérique n’est plus une option : c’est un levier de compétitivité.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
4	IS Technologies	Exact match	Courbevoie Cedex, FranceHQ recorded Sep 28, 2026	n/a	127 contacts →
	Exact match “IS Technologies est une société de conseils et de services en informatique basée à La Défense.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
5	ENGIT	Exact match	Valbonne, FranceHQ recorded Sep 28, 2026	51-200	102 contacts →
	Exact match “engIT \| Innovation IT & Transformation digitale - Faire du conseil différemment Depuis 2017, engIT accompagne les entreprises dans leurs projets stratégiques d'innovation…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
6	Novahé	Exact match	Saint Cloud Cedex, FranceHQ recorded Sep 28, 2026	51-200	92 contacts →
	Exact match “En 2018, AS-PC, EVEA TECHNOLOGY et INETD CONSULTING deviennent NOVAHE < Novahé accompagne les ETIs et les Grands Comptes dans l’optimisation et l’urbanisation de leur Système…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
7	Isitix	Exact match	FranceHQ recorded Sep 28, 2026	n/a	83 contacts →
	Exact match “Depuis 20 ans, Isitix accompagne vos projets informatiques et numériques.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
8	Tlti Ingénierie Numérique	Exact match	Paris, FranceHQ recorded Sep 28, 2026	11-50	69 contacts →
	Exact match “CONSEIL : Un savoir-faire reconnu et structuré autour d'axes métiers.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
9	Artik Consulting	Exact match	Issy-les-moulineaux, FranceHQ recorded Sep 28, 2026	11-50	59 contacts →
	Exact match “Artik Consulting Artik est une société de conseil technologique qui accompagne les grandes entreprises dans leurs projets de transformation SI.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
10	Kern Consulting	Exact match	Paris, FranceHQ recorded Sep 28, 2026	51-200	59 contacts →
	Exact match “Kern Consulting est un cabinet d'experts spécialistes de la transformation de l'entreprise, convaincus que le Système d'Information en est un levier incontournable.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
11	Diggers	Exact match	Paris, FranceHQ recorded Sep 28, 2026	51-200	58 contacts →
	Exact match “Diggers est un cabinet de conseil facilitateur de projets et de transformations, spécialisé dans les métiers de l'IT (développement, data & IA, devops, cloud) et une agence de…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
12	Syspertec Group	Exact match	Saint-cloud, FranceHQ recorded Sep 28, 2026	11-50	53 contacts →
	Exact match “Since 1993, Syspertec Group has been developing software solutions designed to simplify information system integration and modernize complex technical environments.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
13	Lenstra	Exact match	Paris, FranceHQ recorded Sep 28, 2026	51-200	53 contacts →
	Exact match “Lenstra is a consultancy that specialises in Tech.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
14	Onefirst	Exact match	Puteaux, FranceHQ recorded Sep 28, 2026	51-200	49 contacts →
	Exact match “Onefirst Group is a Consultancy specialising in Information Systems Management and Digital Transformation.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
15	Spikeelabs	Exact match	Rennes, FranceHQ recorded Sep 28, 2026	51-200	45 contacts →
	Exact match “SpikeeLabs travaille auprès de ses clients sur la conception et la réalisation de leur système d’information.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
16	Ootary	Exact match	Soultz-haut-rhin, FranceHQ recorded Sep 28, 2026	11-50	45 contacts →
	Exact match “Simplify your IT projects and accelerate your digital transformation Whether it’s migrating to an ERP system, optimizing your IT infrastructure, or managing data flows… these are…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
17	Ness Technologies	Exact match	Saint Michel Sur Orge, FranceHQ recorded Sep 28, 2026	51-200	45 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
18	Kertios	Exact match	Suresnes, FranceHQ recorded Sep 28, 2026	11-50	43 contacts →
	Exact match “Le groupe Kertios est composé d'activités de Conseil et de Technologies.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
19	Asenium Consulting	Exact match	La Défense, FranceHQ recorded Sep 28, 2026	51-200	41 contacts →
	Exact match “Asenium, a key player in digital and IT transformation consulting, has been providing highly qualified consultants since 2005.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
20	Adonis Groupe	Exact match	Paris, FranceHQ recorded Sep 28, 2026	51-200	37 contacts →
	Exact match “Suivez la page entreprise ADONIS et restez informés de notre actualité Profil : QUI SOMMES-NOUS?” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
21	Move Solutions	Exact match	69002, FranceHQ recorded Sep 28, 2026	51-200	35 contacts →
	Exact match “Move Solutions is an IT services company specialized in development and transformation of information systems : Data Migration, Modernization and Maintenance.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
22	Management Square	Exact match	Montigny-le-bretonneux, FranceHQ recorded Sep 28, 2026	51-200	34 contacts →
	Exact match “Depuis sa création, Management Square s'est positionné comme un acteur de référence dans l'accompagnement des entreprises face aux défis actuels du monde numérique.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
23	Kp2i	Exact match	Paris, FranceHQ recorded Sep 28, 2026	51-200	33 contacts →
	Exact match “KP2i est un cabinet de Conseil & de Services qui vous accompagne pour transformer votre système d’information en un véritable partenaire business.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
24	Nexen Partners	Exact match	Issy-les-moulineaux, FranceHQ recorded Sep 28, 2026	11-50	32 contacts →
	Exact match “Nexen is an IS consulting agency funded in 2018 by several experienced consultants, who share the belief that ensuring customer satisfaction as much as employees’ growth is the…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
25	Gaia Mini Systemes	Exact match	Lyon, FranceHQ recorded Sep 28, 2026	11-50	31 contacts →
	Exact match “Nous sommes des experts en #IBMi depuis plus de 30 ans.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “legacy system modernization consultancies”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 483 legacy system modernization consultancies based in France

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Legacy system modernization consultancies based in France at a glance

As of Sep 28, 2026

34.7%Verified-email coverage

11.9Average contacts per company

1-10Median size (employees)

24.2%Largest-city concentration · Paris

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

334

11-50

101

51-200

201-500

501-1,000

1,001-5,000

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 483 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with France whose business descriptions match “legacy system modernization consultancies” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 1,997 professional contacts with verified work emails across the full matched dataset. 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 28, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Legacy system modernization consultancies by metro

Legacy system modernization consultancies in Paris117

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “legacy system modernization consultancies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many legacy system modernization consultancies are there based in France?

RevenueBase identified 483 company matches for legacy system modernization consultancies associated with France as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Infotel tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most legacy system modernization consultancies?

Paris leads with 117 company records, followed by Lyon (20) and Toulouse (12).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 1,997 professional contacts with verified work emails tracked across these 483 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 28, 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 SmartSearch, 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.