These companies in Hauts-de-Seine are primarily IT services and consulting firms, with a strong focus on digital transformation, data, and artificial intelligence. They range from large established groups like Astek, which supports clients with deep technical expertise, to mid-sized companies such as SFEIR, providing expert application development, and Devoteam, specializing in Google Cloud solutions.
The headquarters are concentrated in a few cities within Hauts-de-Seine, with Boulogne-Billancourt, Levallois-Perret, and Neuilly-sur-Seine being prominent locations. Many of these firms, including Jems Group and MARGO, were founded in the 2000s, indicating a common era of growth for specialized IT and consulting services.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Astekastekgroup.fr
Supports clients with high-value service, deep technical expertise across technology, operations, and engineering, focusing on sustainable digital transformation with humans at the core. |
6,035 | |||
| 2 | 1,083 | ||||
| 3 |
Jems Groupjems-group.com
Create, manage, and operate customer data patrimony, industrializing use cases and innovative services based on AI or pure analytics for key accounts. |
717 | |||
| 4 |
TNP Consultantstnpconsultants.com
Independent consulting firm specializing in operational, regulatory, and digital transformations across multiple industries and regions worldwide. |
584 | |||
| 5 |
Devoteam | Google Cloud Partnergcloud.devoteam.com
Provides innovative Google Cloud solutions across AI, IT modernization, security, and work transformation, with expertise in migrating users and assisting organizations. |
579 | |||
| 6 | 385 | ||||
| 7 |
Lincoln Francelincoln.fr
Offers data science and Modern BI expertise, consulting, and support for decision-making projects, utilizing predictive analysis and machine learning algorithms. |
316 | |||
| 8 |
APGARapgar-group.com
Provides global consultancy and managed services in data management and AI, supporting diverse industries with sustainable, innovative solutions. |
278 | |||
| 9 | 210 | ||||
| 10 |
Adservioadservio.fr
Design and implementation of resilient digital experiences through expert consulting, technical infrastructure optimization, and innovative technology solutions to ensure reliable business performance. |
190 | |||
| 11 | 172 | ||||
| 12 | 164 | ||||
| 13 |
ILLUIN Technologyilluin.tech
Specialists in scientific, technological, Design Thinking, and UX, driving innovation and digital transformation by leveraging AI and user-centric approaches in agile, tech-driven solutions |
162 | |||
| 14 |
FINAXYSfinaxys.com
Specialized IT consulting firm for financial institutions, providing expertise in financial engineering, IT systems architecture, application development, and software integration for market finance |
161 | |||
| 15 |
Devoteam Data Drivendevoteam.com
A cross-functional team leveraging data insights to drive business impact, agility, competitiveness, and sustainable growth while nurturing a data-driven culture within organizations |
160 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 16 |
Openvalueopenvalue.co
Openvalue is a consulting and integration firm specializing in Data & Artificial Intelligence, offering services in Machine Learning, NLP, UX design, and application development |
133 | |||
| 17 |
CARBON ITcarbon-it.fr
Consulting and IT expertise in Artificial Intelligence and Software Engineering. Structuring and industrializing digital ambitions combining technical excellence, methodological rigor, and business value creation. |
121 | |||
| 18 |
Aubay Data & AIaubay.com
Aubay Data & AI specializes in Data and Artificial Intelligence consulting, guiding clients in defining and implementing successful data strategies for innovation and transformation |
102 | |||
| 19 |
Visianvisian.tech
VISIAN, a subsidiary of Neurones Group, specializes in IT strategy, innovation, project management, product development, and data analysis to accelerate business transformation |
80 | |||
| 20 | 79 | ||||
| 21 |
POLARYSsilamir.com
Specializing in advisory, design, and implementation of decision-making projects, with a team of 200 combining business expertise and technology mastery Providing top-notch analytical experiences to clients |
79 | |||
| 22 |
Seequalisseequalis.com
Accelerating new digital practices adoption through AI-powered experiences, change management, knowledge structuring, and IT service reliability for improved employee performance. |
79 | |||
| 23 | 78 | ||||
| 24 |
GO & DEVgoandev.net
Technical expertise for web project development including custom software creation and digital solutions for clients seeking professional programming and application design services. |
75 | |||
| 25 |
I脡SEG CONSEIL Parisiesegconseil.fr
Non-profit student association providing consulting and study services to companies, offering practical experience to business school students. |
75 | |||
| 26 |
SKIILSskiils.com
Connecting top talents with business needs for sustainable impact in technology, Data, and AI projects, with strong expertise in complex project management. |
74 | |||
| 27 | 61 | ||||
| 28 |
TRIMANE | Expert BI et Big Datatrimane.fr
Data management consultancy providing business intelligence and big data services to public and private sectors through technical expertise and methodological project support. |
60 | |||
| 29 |
Polynompolynom.io
Designing and deploying agentic AI systems, human-in-the-loop process automation, and production-grade AI platforms for optimizing complex business processes. |
47 | |||
| 30 |
Prime Analyticsprimeanalytics.fr
Consulting and training firm specializing in finance, data, and artificial intelligence, helping financial institutions and multinationals transform data into actionable insights. |
44 | |||
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How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 12, 2026.
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