Company lists · Data refreshed September 2026

Top 25 Legacy software modernization companies based in France

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

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 93 companies tracked

RevenueBase identified 93 legacy software modernization companies headquartered in France as of September 2026 and tracks 975 professional contacts across them, including 329 with verified work emails. Paris is the largest hub.

This list covers legacy software 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 28, 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 28, 2026 86% judged on-target in blind review

93Companies

975Contacts tracked

329Verified emails

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The 25 largest legacy software modernization companies based in France

Ranked by team size

Top 25 of 93 legacy software modernization companies based in France, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to legacy software 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	Adservio	Indirect evidence	Puteaux, FranceHQ checked Sep 28, 2026	201-500	161 contacts →
	Indirect evidence “We build a resilient digital experience.” Source: RevenueBase Database · checked Sep 28, 2026
2	SERLI	Indirect evidence	Chasseneuil-du-poitou, FranceHQ checked Sep 28, 2026	51-200	78 contacts →
	Indirect evidence “If you’re looking for a team who are up to the challenges of your project, you found it!” Source: RevenueBase Database · checked Sep 28, 2026
3	L'atelier	Indirect evidence	Paris, FranceHQ checked Sep 28, 2026	11-50	60 contacts →
	Indirect evidence “L’Atelier est une société de conseil tech au service des entreprises pour la création de produits web et mobiles.” Source: RevenueBase Database · checked Sep 28, 2026
4	Diggers	Indirect evidence	Paris, FranceHQ checked Sep 28, 2026	51-200	58 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 28, 2026
5	Syspertec Group	Partial evidence	Saint-cloud, FranceHQ checked Sep 28, 2026	11-50	53 contacts →
	Partial evidence “Since 1993, Syspertec Group has been developing software solutions designed to simplify information system integration and modernize complex technical environments.” Source: RevenueBase Database · checked Sep 28, 2026
6	Agilia Technology	Indirect evidence	Entzheim, FranceHQ checked Sep 28, 2026	11-50	47 contacts →
	Indirect evidence “Agilia Technology est une entreprise de services numériques spécialisée dans le conseil et l’expertise technologique.” Source: RevenueBase Database · checked Sep 28, 2026
7	Move Solutions	Partial evidence	69002, FranceHQ checked Sep 28, 2026	51-200	35 contacts →
	Partial evidence “Move Solutions is an IT services company specialized in development and transformation of information systems : Data Migration, Modernization and Maintenance.” Source: RevenueBase Database · checked Sep 28, 2026
8	Codeworks	Indirect evidence	Paris, FranceHQ checked Sep 28, 2026	11-50	34 contacts →
	Indirect evidence “Créée en 2018, CodeWorks est une ESN d’ingénierie logicielle qui accompagne les directions techniques sur des enjeux concrets de delivery, de qualité et de scalabilité.” Source: RevenueBase Database · checked Sep 28, 2026
9	PIT	Indirect evidence	Lille, FranceHQ checked Sep 28, 2026	11-50	30 contacts →
	Indirect evidence “Pit est une ESN lilloise, créée en 2015 (anciennement Progress‑IT), composée de développeurs, product managers et Scrum Masters.” Source: RevenueBase Database · checked Sep 28, 2026
10	We ARE Beebay	Indirect evidence	Paris, FranceHQ checked Sep 28, 2026	51-200	27 contacts →
	Indirect evidence “We Are Beebay is an IT consulting agency.” Source: RevenueBase Database · checked Sep 28, 2026
11	Crafteam	Indirect evidence	Paris, FranceHQ checked Sep 28, 2026	11-50	19 contacts →
	Indirect evidence “Crafteam est un cabinet de conseil en informatique qui rassemble une communauté d’experts passionnés et spécialisés dans le développement d'applications de pointe.” Source: RevenueBase Database · checked Sep 28, 2026
12	Euraxiel	Indirect evidence	Paris, FranceHQ checked Sep 28, 2026	11-50	18 contacts →
	Indirect evidence “Notre ADN : la qualité des développements et l’industrialisation des processus.” Source: RevenueBase Database · checked Sep 28, 2026
13	Jasmine Conseil	Indirect evidence	Chatou, FranceHQ checked Sep 28, 2026	11-50	18 contacts →
	Indirect evidence “Jasmine Conseil est une société spécialisée dans le conseil et l’expertise en systèmes et logiciels informatiques.” Source: RevenueBase Database · checked Sep 28, 2026
14	Scorpulting	Indirect evidence	Massy, FranceHQ checked Sep 28, 2026	11-50	16 contacts →
	Indirect evidence “Entreprise spécialisée dans le conseil en systèmes d'informations innovants intervenant dans des secteurs d’activité variés.” Source: RevenueBase Database · checked Sep 28, 2026
15	Energy WAY	Indirect evidence	Paris, FranceHQ checked Sep 28, 2026	11-50	15 contacts →
	Indirect evidence “Energy Way est une ESN spécialisée dans la modernisation et la transformation digitale des systèmes d’information critiques, avec une expertise reconnue en environnements…” Source: RevenueBase Database · checked Sep 28, 2026
16	Albalogic	Indirect evidence	Aubagne, FranceHQ checked Sep 28, 2026	11-50	12 contacts →
	Indirect evidence “DEVELOPPEMENT Conception d’architectures logicielles modernes, robustes et stables selon l’environnement de déploiement de vos applications en tenant compte de vos habitudes…” Source: RevenueBase Database · checked Sep 28, 2026
17	Craftmania	Indirect evidence	Paris, FranceHQ checked Sep 28, 2026	51-200	11 contacts →
	Indirect evidence “Dans un marché obsédé par le time-to-market, nous défendons une idée simple : une application n'est pas un livrable, c'est un actif.” Source: RevenueBase Database · checked Sep 28, 2026
18	2le Logiciel Libre Pour L Entreprise	Indirect evidence	Mulhouse, FranceHQ checked Sep 28, 2026	11-50	10 contacts →
	Indirect evidence “2LE est une entreprise de développement logiciels entreprise sur mesure.” Source: RevenueBase Database · checked Sep 28, 2026
19	Daka Team Data In Action Knowledge For ALL	Indirect evidence	Lille, FranceHQ checked Sep 28, 2026	11-50	10 contacts →
	Indirect evidence “DAKA•TEAM est une ESN hydride, Spécialiste de la et de son écosystème!” Source: RevenueBase Database · checked Sep 28, 2026
20	Tekteo	Indirect evidence	Paris, FranceHQ checked Sep 28, 2026	1-10	10 contacts →
	Indirect evidence “Tekteo est née d'une véritable passion commune pour le numérique.” Source: RevenueBase Database · checked Sep 28, 2026
21	A3is	Indirect evidence	Charenton Le Pont, FranceHQ checked Sep 28, 2026	201-500	9 contacts →
	Indirect evidence “A3IS, une marque du groupe BLUE SOFT, est une ESN spécialisée dans la transformation digitale et le développement d’applications Mobiles et web marchand.” Source: RevenueBase Database · checked Sep 28, 2026
22	Oppchain	Partial evidence	Paris, FranceHQ checked Sep 28, 2026	11-50	9 contacts →
	Partial evidence “Oppchain is a next generation IT service provider and software development established to bring creativity, innovative solutions with clear business value, talent to clients and…” Source: RevenueBase Database · checked Sep 28, 2026
23	Global Info	Indirect evidence	Pompey, FranceHQ checked Sep 28, 2026	11-50	8 contacts →
	Indirect evidence “Fondée en 2007, Global Info est une Entreprise de Services du Numérique (ESN) qui délivre ses compétences dans trois domaines d’expertise différents : o L’intégration de solutions…” Source: RevenueBase Database · checked Sep 28, 2026
24	GENEE	Indirect evidence	Lyon, FranceHQ checked Sep 28, 2026	11-50	8 contacts →
	Indirect evidence “Découvrez Genee, votre partenaire en transformation numérique!” Source: RevenueBase Database · checked Sep 28, 2026
25	Itheis	Partial evidence	Aix En Provence Cedex 3, FranceHQ checked Sep 28, 2026	1-10	7 contacts →
	Partial evidence “itheis is a major actor in the IBM i iSeries System i modernization market.” Source: RevenueBase Database · checked Sep 28, 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 software 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 software modernization companies.
Partial evidence: Its own public description names part of legacy software 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 software 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 93 legacy software modernization companies based in France

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Legacy software modernization companies based in France at a glance

As of Sep 28, 2026

33.7%Verified-email coverage

10.5Average contacts per company

1-10Median size (employees)

37.6%Largest-city concentration · Paris

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

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 93 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 software 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 software 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 software 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 software 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, 329 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 28, 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 software modernization companies by metro

Legacy software modernization companies in Paris35

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 software 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 software modernization companies are there based in France?

RevenueBase identified 93 legacy software 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?

Adservio, headquartered in Puteaux, tops this list with the largest team on record.

Which city has the most legacy software modernization companies?

Paris leads with 35 headquartered companies, followed by Lyon (5) and La Garenne-Colombes (2).

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 329 verified decision-maker contacts tracked across these 93 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 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 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.