Company lists · Data refreshed November 2026

Top 23 Custom development agencies based in France

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

Compiled by the RevenueBase Data Team Data refreshed Nov 6, 2026 3,722 companies tracked

RevenueBase identified 3,722 company matches for custom development agencies associated with France as of November 2026 and tracks 35,476 professional contacts across them, including 12,446 with verified work emails. Paris is the largest hub.

This list covers company matches for custom development agencies 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 November 6, 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 Nov 6, 2026 How this list was built

3,722Companies

35,476Contacts tracked

12,446Verified emails

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The 23 largest custom development agencies based in France

Ranked by team size

Top 23 of 3,722 company matches for custom development agencies based in France, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 6, 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	Groupe SII	Exact match	Paris, FranceHQ recorded Nov 6, 2026	10001+	5,212 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2	IGA	Exact match	Malakoff, FranceHQ recorded Nov 6, 2026	n/a	1,708 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3	SFEIR	Exact match	Neuilly-sur-seine, FranceHQ recorded Nov 6, 2026	501-1,000	916 contacts →
	Exact match “SFEIR est une Société d’expertise spécialisée dans le développement d’applications sous toutes leurs formes ( web, mobile, IOT, cloud, data, etc.).” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4	CELAD	Exact match	Toulouse, FranceHQ recorded Nov 6, 2026	1,001-5,000	633 contacts →
	Exact match “Consulting and Engineering in innovative technology Celad is a global software engineering company with over 1200 engineers.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5	Sully Group	Exact match	Saint-priest, FranceHQ recorded Nov 6, 2026	501-1,000	581 contacts →
	Exact match “Sully Group : Working together to create a useful and sustainable digital environment > 1 global digital services offering: Business Applications, Mobile Applications…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6	Noveo Group	Exact match	Paris, FranceHQ recorded Nov 6, 2026	501-1,000	338 contacts →
	Exact match “The Noveo group has specialized in design, development and maintenance of digital solutions since 1998.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7	Amiltone	Exact match	Villeurbanne, FranceHQ recorded Nov 6, 2026	201-500	337 contacts →
	Exact match “Bienvenue chez Amiltone.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8	Avanquest	Exact match	Courbevoie, FranceHQ recorded Nov 6, 2026	201-500	334 contacts →
	Exact match “At Avanquest, we develop software that makes digital simpler, smarter and more useful.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9	Infogene	Exact match	Neuilly-sur-seine, FranceHQ recorded Nov 6, 2026	501-1,000	304 contacts →
	Exact match “INFOGENE est une ESN spécialisée dans 3 domaines principaux (en AMOA et MOE): DIGITAL: Notre savoir faire : Conseil, architecture logiciel, conception, développement, maintenance…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10	Ouidou	Exact match	Paris, FranceHQ recorded Nov 6, 2026	201-500	289 contacts →
	Exact match “Fondée en 2017, Ouidou est une entreprise de services du numérique regroupant plus de 250 collaborateurs.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11	Kaizen Solutions KZS	Exact match	Montbonnot-saint-martin, FranceHQ recorded Nov 6, 2026	201-500	275 contacts →
	Exact match “Nous sommes une ESN (entreprise de services numériques) spécialisée dans la conception, le développement et la maintenabilité de solutions informatiques, techniques et…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12	Younup	Exact match	Nantes, FranceHQ recorded Nov 6, 2026	201-500	235 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13	Takima	Exact match	Bagneux, FranceHQ recorded Nov 6, 2026	51-200	225 contacts →
	Exact match “Whether dealing with Opensource, B2B, B2C mobile apps, intranets or HA infrastructures, the same approach remains: Understanding the context, qualifying the use case, determining…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14	AXYUS	Exact match	Issy-les-moulineaux, FranceHQ recorded Nov 6, 2026	51-200	159 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15	Vistalid	Exact match	Bègles, FranceHQ recorded Nov 6, 2026	51-200	157 contacts →
	Exact match “Vistalid est une agence de communication digitale bordelaise orientée web.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16	Reactis Group	Exact match	Aix-en-provence Cedex 3, FranceHQ recorded Nov 6, 2026	201-500	149 contacts →
	Exact match “Nous sommes une ESN qui accompagne les entreprises dans leurs projets IT grâce à des modes d'intervention flexibles : Assistance Technique Unitaire (ATU), Assistance Technique…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
17	HR Team Group	Exact match	Paris, FranceHQ recorded Nov 6, 2026	501-1,000	136 contacts →
	Exact match “Since 2005, HR Team, Digital Services Company, has been ensuring a digital strategy in line with the ambition of its customers.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18	Groupe KEY Consulting	Exact match	Suresnes, FranceHQ recorded Nov 6, 2026	51-200	132 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
19	IS Technologies	Exact match	Courbevoie Cedex, FranceHQ recorded Nov 6, 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 · Nov 6, 2026 · View company records in RevenueBase
20	Omnilog	Exact match	Boulogne-billancourt, FranceHQ recorded Nov 6, 2026	201-500	125 contacts →
	Exact match “Nos mots-clés :#Médias,#Technos,#Convivialité Plus qu'une SSII, Omnilog est une équipe de 300 ingénieurs spécialisés dans le développement web et mobile et les technologies.NET…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
21	Web-Atrio	Exact match	Paris, FranceHQ recorded Nov 6, 2026	51-200	122 contacts →
	Exact match “Bienvenue chez WEB-ATRIO, l’#ESN qui change la donne!” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
22	Spark-It	Exact match	La Défense 5, FranceHQ recorded Nov 6, 2026	51-200	108 contacts →
	Exact match “Spark-it is an expert in software architecture.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
23	Bharti Soft Tech Pvt. LTD	Exact match	Paris, FranceHQ recorded Nov 6, 2026	201-500	108 contacts →
	Exact match “Bharti Soft Tech Pvt.” Recorded in the RevenueBase company graph · Nov 6, 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 “custom development agencies”. 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 23 of 3,722 custom development agencies based in France

See the full list, filter by size, metro and specialty, and access 12,446 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Custom development agencies based in France at a glance

As of Nov 6, 2026

35.1%Verified-email coverage

9.5Average contacts per company

1-10Median size (employees)

20.9%Largest-city concentration · Paris

Nov 6, 2026Page data refreshed

Companies by employee count

1-10

2,973

11-50

584

51-200

101

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 3,722 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 “custom development agencies” 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 12,446 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 November 6, 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.

Custom development agencies by metro

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 “custom development agencies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many custom development agencies are there based in France?

RevenueBase identified 3,722 company matches for custom development agencies associated with France as of November 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?

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

Which city has the most custom development agencies?

Paris leads with 779 company records, followed by Lyon (143) and Toulouse (92).

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 12,446 professional contacts with verified work emails tracked across these 3,722 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 November 6, 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.