Company lists · Data refreshed September 2026

Top 25 Custom software development consulting firms based in France

Name: Custom software development consulting firms based in France
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 24, 2026 4,625 companies tracked

RevenueBase identified 4,625 custom software development consulting firms headquartered in France as of September 2026 and tracks 66,148 professional contacts across them, including 22,465 with verified work emails and 1,744 with mobile numbers. Paris is the largest hub.

This list covers custom software development consulting firms 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 24, 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 24, 2026 86% judged on-target in blind review

4,625Companies

66,148Contacts tracked

22,465Verified emails

1,744Mobile numbers

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The 25 largest custom software development consulting firms based in France

Ranked by team size

Top 25 of 4,625 custom software development consulting firms based in France, ranked by team size, largest first. Data refreshed Sep 24, 2026. RevenueBase Smart Search rates how each company's information relates to custom software development consulting 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	Groupe SII	Indirect evidence	Paris, FranceHQ checked Sep 24, 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 24, 2026
2	Keyrus	Indirect evidence	Levallois-perret, FranceHQ checked Sep 24, 2026	1,001-5,000	1,964 contacts →
	Indirect 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 24, 2026
3	Infotel	Indirect evidence	Neuilly-sur-seine, FranceHQ checked Sep 24, 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 24, 2026
4	Prodware	Indirect evidence	Paris, FranceHQ checked Sep 24, 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 24, 2026
5	SMILE	Indirect evidence	Asnières Sur Seine, FranceHQ checked Sep 24, 2026	1,001-5,000	1,352 contacts →
	Indirect evidence “We are Technology experts & Business partners.” Source: RevenueBase Database · checked Sep 24, 2026
6	NIJI	Indirect evidence	Issy-les-moulineaux, FranceHQ checked Sep 24, 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 24, 2026
7	SFEIR	Indirect evidence	Neuilly-sur-seine, FranceHQ checked Sep 24, 2026	501-1,000	904 contacts →
	Indirect evidence “SFEIR est une Société d’expertise spécialisée dans le développement d’applications sous toutes leurs formes ( web, mobile, IOT, cloud, data, etc.).” Source: RevenueBase Database · checked Sep 24, 2026
8	Viveris	Partial evidence	Boulogne-billancourt, FranceHQ checked Sep 24, 2026	1,001-5,000	833 contacts →
	Partial evidence “Viveris is a consulting and engineering company with two main activities - IT consulting.” Source: RevenueBase Database · checked Sep 24, 2026
9	Groupe Intm	Indirect evidence	Levallois-perret, FranceHQ checked Sep 24, 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 24, 2026
10	Catamania	Indirect evidence	Saint-herblain, FranceHQ checked Sep 24, 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 24, 2026
11	Exakis Nelite	Indirect evidence	Bidart, FranceHQ checked Sep 24, 2026	501-1,000	621 contacts →
	Indirect evidence “Exakis Nelite devient Magellan!” Source: RevenueBase Database · checked Sep 24, 2026
12	Intalio	Indirect evidence	Fontenay-sous-bois, FranceHQ checked Sep 24, 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 24, 2026
13	Klanik	Partial evidence	Marseille, FranceHQ checked Sep 24, 2026	501-1,000	585 contacts →
	Partial 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 24, 2026
14	Sully Group	Indirect evidence	Saint-priest, FranceHQ checked Sep 24, 2026	501-1,000	560 contacts →
	Indirect evidence “Sully Group : Working together to create a useful and sustainable digital environment > 1 global digital services offering: Business Applications, Mobile Applications…” Source: RevenueBase Database · checked Sep 24, 2026
15	DCS Easyware	Indirect evidence	Lyon, FranceHQ checked Sep 24, 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 24, 2026
16	Zenika	Partial evidence	Paris, FranceHQ checked Sep 24, 2026	501-1,000	430 contacts →
	Partial evidence “Zenika is an IT consulting firm with 550 employees that helps companies with their digital transformation.” Source: RevenueBase Database · checked Sep 24, 2026
17	Audensiel	Partial evidence	Boulogne-billancourt, FranceHQ checked Sep 24, 2026	1,001-5,000	417 contacts →
	Partial evidence “Digital transformation company, business and technology consulting, Audensiel supports its clients in all business sectors in France and abroad in the following areas- Digital…” Source: RevenueBase Database · checked Sep 24, 2026
18	Conserto	Indirect evidence	Saint-herblain, FranceHQ checked Sep 24, 2026	201-500	378 contacts →
	Indirect evidence “Conserto, jeune société innovante et dynamique, propose des prestations de conseil et d’expertise informatique : Nous avons 3 domaines d'expertise - Cloud - Digital - Embedded Et…” Source: RevenueBase Database · checked Sep 24, 2026
19	ITS Group S.A	Indirect evidence	Boulogne-billancourt, FranceHQ checked Sep 24, 2026	1,001-5,000	342 contacts →
	Indirect evidence “For over 20 years, ITS Group has supported companies in their digital transformation projects thanks to the strength of its specialized areas of expertise.” Source: RevenueBase Database · checked Sep 24, 2026
20	LÙKLA	Indirect evidence	Paris, FranceHQ checked Sep 24, 2026	501-1,000	331 contacts →
	Indirect evidence “Together, aiming higher and going further to unlock your potential.” Source: RevenueBase Database · checked Sep 24, 2026
21	Noveo Group	Partial evidence	Paris, FranceHQ checked Sep 24, 2026	501-1,000	327 contacts →
	Partial evidence “The Noveo group has specialized in design, development and maintenance of digital solutions since 1998.” Source: RevenueBase Database · checked Sep 24, 2026
22	Avanquest	Partial evidence	Courbevoie, FranceHQ checked Sep 24, 2026	201-500	315 contacts →
	Partial evidence “At Avanquest, we develop software that makes digital simpler, smarter and more useful.” Source: RevenueBase Database · checked Sep 24, 2026
23	Amiltone	Indirect evidence	Villeurbanne, FranceHQ checked Sep 24, 2026	201-500	314 contacts →
	Indirect evidence “Bienvenue chez Amiltone.” Source: RevenueBase Database · checked Sep 24, 2026
24	Infogene	Indirect evidence	Neuilly-sur-seine, FranceHQ checked Sep 24, 2026	501-1,000	291 contacts →
	Indirect evidence “INFOGENE est une ESN spécialisée dans 3 domaines principaux (en AMOA et MOE): DIGITAL: Notre savoir faire : Conseil, architecture logiciel, conception, développement, maintenance…” Source: RevenueBase Database · checked Sep 24, 2026
25	Avisia	Indirect evidence	Paris, FranceHQ checked Sep 24, 2026	201-500	284 contacts →
	Indirect evidence “Founded in 2007, AVISIA has become over the years a leading player in Data, Digital & Technologies.” Source: RevenueBase Database · checked Sep 24, 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: custom software development consulting 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 custom software development consulting firms.
Partial evidence: Its own public description names part of custom software development consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name custom software development consulting 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 4,625 custom software development consulting firms based in France

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Custom software development consulting firms based in France at a glance

As of Sep 24, 2026

34.0%Verified-email coverage

2.6%Mobile-number coverage

14.3Average contacts per company

1-10Median size (employees)

23.2%Largest-city concentration · Paris

Sep 24, 2026Page data refreshed

Companies by employee count

1-10

3,331

11-50

927

51-200

248

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 26.0d

17,2060–30

4,87531–60

28761–90

590–180

92180+

Company record updated

Median 79.0d

00–30

18,10731–60

31,04161–90

13,61590–180

3,385180+

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 custom software development consulting 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 France whose own description of what they do matches “custom software development consulting 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 custom software development consulting 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 custom software development consulting firms, 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, 22,465 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 24, 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.

Custom software development consulting firms by metro

Custom software development consulting firms in Paris1074
Custom software development consulting firms in Lyon177
Custom software development consulting firms in Toulouse94
Custom software development consulting firms in Bordeaux86
Custom software development consulting firms in Nantes65
Custom software development consulting firms in Marseille63
Custom software development consulting firms in Lille52
Custom software development consulting firms in Montpellier50
Custom software development consulting firms in Rennes40
Custom software development consulting firms in Strasbourg38
Custom software development consulting firms in Neuilly-Sur-Seine33
Custom software development consulting firms in Boulogne-Billancourt31
Custom software development consulting firms in Courbevoie30
Custom software development consulting firms in Nice30
Custom software development consulting firms in Grenoble26

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 custom software development consulting 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 custom software development consulting firms are there based in France?

RevenueBase identified 4,625 custom software development consulting firms 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?

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

Which city has the most custom software development consulting firms?

Paris leads with 1074 headquartered companies, followed by Lyon (177) and Toulouse (94).

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 22,465 verified decision-maker contacts tracked across these 4,625 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 24, 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.