Company lists · Data refreshed September 2026

Top 25 Custom software engineering partners based in France

Name: Custom software engineering partners based in France
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 24, 2026 1,075 companies tracked

RevenueBase identified 1,075 custom software engineering partners headquartered in France as of September 2026 and tracks 7,290 professional contacts across them, including 2,586 with verified work emails and 198 with mobile numbers. Paris is the largest hub.

This list covers custom software engineering partners 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

1,075Companies

7,290Contacts tracked

2,586Verified emails

198Mobile numbers

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The 25 largest custom software engineering partners based in France

Ranked by team size

Top 25 of 1,075 custom software engineering partners 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 engineering partners: 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	IGA	Indirect evidence	Malakoff, FranceHQ checked Sep 24, 2026	n/a	1,530 contacts →
	Indirect evidence “Métiers - Edition de composants/modules logiciels pour les métiers de l’assurance, du voyage et du négoce- Création de solutions spécifiques pour le compte des clients- Suivi et…” Source: RevenueBase Database · checked Sep 24, 2026
2	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
3	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
4	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
5	Kaizen Solutions KZS	Indirect evidence	Montbonnot-saint-martin, FranceHQ checked Sep 24, 2026	201-500	261 contacts →
	Indirect evidence “Nous sommes une ESN (entreprise de services numériques) spécialisée dans la conception, le développement et la maintenabilité de solutions informatiques, techniques et…” Source: RevenueBase Database · checked Sep 24, 2026
6	Avisto	Partial evidence	Valbonne, FranceHQ checked Sep 24, 2026	201-500	226 contacts →
	Partial evidence “The software development: your passion, our profession.” Source: RevenueBase Database · checked Sep 24, 2026
7	Younup	Indirect evidence	Nantes, FranceHQ checked Sep 24, 2026	201-500	225 contacts →
	Indirect evidence “Bienvenue chez Younup : la néo-ESN, agile, humaine, faite de passionnés, avec une ambition simple et forte : remettre l’humain et l’expertise technique au cœur du service IT.” Source: RevenueBase Database · checked Sep 24, 2026
8	UNIS	Indirect evidence	Villeneuve D'ascq, FranceHQ checked Sep 24, 2026	201-500	181 contacts →
	Indirect evidence “Vous avez envie de prendre part à un projet d'entreprise fort au sein d'une entreprise qui favorise l'expression des talents de chacun?” Source: RevenueBase Database · checked Sep 24, 2026
9	AXYUS	Indirect evidence	Issy-les-moulineaux, FranceHQ checked Sep 24, 2026	51-200	170 contacts →
	Indirect evidence “Une SSII avec de vraies valeurs."S'engager au forfait, respecter, les attentes de nos clients, leur budget en favorisant notamment la réutilisation affichée de nos composants…” Source: RevenueBase Database · checked Sep 24, 2026
10	Groupe KEY Consulting	Indirect evidence	Suresnes, FranceHQ checked Sep 24, 2026	51-200	128 contacts →
	Indirect evidence “Notre raison d'être est d'accompagner l'évolution des usages de nos clients (startup, éditeurs, grands comptes) grâce à l'impact de nos ingénieurs IT.” Source: RevenueBase Database · checked Sep 24, 2026
11	SCUB	Indirect evidence	Angoulême, FranceHQ checked Sep 24, 2026	51-200	127 contacts →
	Indirect evidence “Scub est une société de service en informatique qui a pour but de fournir du conseil et de développer des applications spécifiques afin de résoudre vos problématiques les plus…” Source: RevenueBase Database · checked Sep 24, 2026
12	IS Technologies	Indirect evidence	Courbevoie Cedex, FranceHQ checked Sep 24, 2026	n/a	127 contacts →
	Indirect evidence “IS Technologies est une société de conseils et de services en informatique basée à La Défense.” Source: RevenueBase Database · checked Sep 24, 2026
13	Tritux	Indirect evidence	Paris, FranceHQ checked Sep 24, 2026	51-200	108 contacts →
	Indirect evidence “Depuis sa création en 2006, TRITUX a développé une expertise et un savoir faire lui permettant de mener à bien tous ses projets de l’amont à l’aval.” Source: RevenueBase Database · checked Sep 24, 2026
14	Spark-It	Partial evidence	La Défense 5, FranceHQ checked Sep 24, 2026	51-200	105 contacts →
	Partial evidence “Spark-it is an expert in software architecture.” Source: RevenueBase Database · checked Sep 24, 2026
15	Castelis	Indirect evidence	Ivry Sur Seine, FranceHQ checked Sep 24, 2026	51-200	97 contacts →
	Indirect evidence “Castelis, c'est l'histoire d'une entreprise en croissance continue.” Source: RevenueBase Database · checked Sep 24, 2026
16	Bharti Soft Tech Pvt. LTD	Indirect evidence	Paris, FranceHQ checked Sep 24, 2026	201-500	97 contacts →
	Indirect evidence “Bharti Soft Tech Pvt.” Source: RevenueBase Database · checked Sep 24, 2026
17	Nextoo	Indirect evidence	Roubaix, FranceHQ checked Sep 24, 2026	51-200	95 contacts →
	Indirect evidence “Eh non,"Développeurs de progrès", n’est pas qu'un joli slogan pour nos T-shirts; c'est une véritable philosophie.” Source: RevenueBase Database · checked Sep 24, 2026
18	BIMP	Indirect evidence	Limonest, FranceHQ checked Sep 24, 2026	501-1,000	95 contacts →
	Indirect evidence “Chaque client est unique, c’est en cela que nous vous proposons un accompagnement sur mesure et complet.” Source: RevenueBase Database · checked Sep 24, 2026
19	Toshiba Centre Grand Ouest	Indirect evidence	Sotteville-lès-rouen, FranceHQ checked Sep 24, 2026	51-200	95 contacts →
	Indirect evidence “Toshiba Centre Grand Ouest met sa passion de l'innovation au service de ses clients en proposant des solutions à la pointe de la technologie, utiles à la vie des entreprises…” Source: RevenueBase Database · checked Sep 24, 2026
20	ELOSI	Indirect evidence	Villeneuve D'ascq, FranceHQ checked Sep 24, 2026	51-200	94 contacts →
	Indirect evidence “ELOSI est une société de services informatiques spécialisée dans la refonte de site internet, le e-commerce et la business intelligence.” Source: RevenueBase Database · checked Sep 24, 2026
21	6tm	Indirect evidence	Rennes, FranceHQ checked Sep 24, 2026	51-200	91 contacts →
	Indirect evidence “6TM accompagne ses clients vers un monde toujours plus communicant grâce à ses solutions web, mobiles et logiciels.” Source: RevenueBase Database · checked Sep 24, 2026
22	4sh	Indirect evidence	Le Haillan, FranceHQ checked Sep 24, 2026	51-200	85 contacts →
	Indirect evidence “4SH est une entreprise de services du numérique.” Source: RevenueBase Database · checked Sep 24, 2026
23	SERLI	Indirect evidence	Chasseneuil-du-poitou, FranceHQ checked Sep 24, 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 24, 2026
24	Ipanova	Indirect evidence	Blagnac, FranceHQ checked Sep 24, 2026	51-200	66 contacts →
	Indirect evidence “IPANOVA a pour mission de développer des solutions informatiques innovantes et adaptées aux besoins de nos clients, tout en favorisant une approche collaborative et inclusive.” Source: RevenueBase Database · checked Sep 24, 2026
25	Désirade	Indirect evidence	Toulouse, FranceHQ checked Sep 24, 2026	51-200	66 contacts →
	Indirect evidence “Désirade est une entreprise de services du numérique spécialisée dans les petites applications depuis 27 ans à Toulouse et Lyon.” 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 engineering partners. 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 engineering partners.
Partial evidence: Its own public description names part of custom software engineering partners, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name custom software engineering partners. 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 1,075 custom software engineering partners based in France

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Custom software engineering partners based in France at a glance

As of Sep 24, 2026

35.5%Verified-email coverage

2.7%Mobile-number coverage

6.8Average contacts per company

1-10Median size (employees)

23.2%Largest-city concentration · Paris

Sep 24, 2026Page data refreshed

Companies by employee count

1-10

1,048

11-50

295

51-200

201-500

501-1,000

1,001-5,000

Freshness & accuracy

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

Email last verified

Median 26.0d

1,9440–30

60131–60

3261–90

190–180

8180+

Company record updated

Median 83.0d

00–30

1,83331–60

3,36961–90

1,71890–180

370180+

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 engineering partners, 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 engineering partners”. 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 engineering partners), 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 engineering partners, 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, 2,586 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 engineering partners 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 custom software engineering partners, 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 engineering partners are there based in France?

RevenueBase identified 1,075 custom software engineering partners 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?

IGA, headquartered in Malakoff, tops this list with the largest team on record.

Which city has the most custom software engineering partners?

Paris leads with 249 headquartered companies, followed by Lyon (58) and Toulouse (36).

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 2,586 verified decision-maker contacts tracked across these 1,075 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.