# The 30 largest IT services companies in the Seine-Saint-Denis department

Tamtam tracks 79 IT services companies headquartered in the Seine-Saint-Denis department. This list ranks the 30 largest by number of employees on LinkedIn, led by e.SNCF Solutions, Solutions30 France and ARKANCE. Their median headcount is 88. Half of them were founded in 2005 or later. The most common headquarters are Saint-Denis (10), Montreuil (4) and Noisy-le-Grand (3).

The companies presented here are IT services firms in Seine-Saint-Denis, mostly mid-sized with headcounts ranging from 88 to 801 employees. These companies specialize in various aspects of digital transformation and technology. For instance, e.SNCF Solutions provides cybersecurity and AI solutions for the SNCF Group, while Solutions30 France offers IT and telecom services to individuals and businesses. ARKANCE focuses on digital transformation for architecture, engineering, construction, and manufacturing.

A significant concentration of these companies is headquartered in Saint-Denis, including CORELIA, which correlates data for clients, and LINKBYNET, which provides outsourcing and cloud computing solutions. Other companies like ekino in Pantin specialize in technology and artificial intelligence, and Cantor in Neuilly-Plaisance focuses on software and data engineering.

🇫🇷 Seine-Saint-Denis · 30 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [e.SNCF Solutions](https://www.tamtam.ai/c/e-sncf-solutions) (linkedin.com)<br>Digital factory supporting SNCF Group with cybersecurity, digital workplace, connectivity, application development, data, AI, and innovation labs. | Technology, Information and Internet | 🇫🇷 Saint-Denis | 801 |  |
| 2 | [Solutions30 France](https://www.tamtam.ai/c/solutions30-france) (solutions30.com)<br>The company provides technological solutions to individuals and businesses in Europe in areas such as IT, telecom, energy, connected devices, security, and facility management | IT Services and IT Consulting | 🇫🇷 Saint-Denis | 695 |  |
| 3 | [ARKANCE](https://www.tamtam.ai/c/arkance) (arkance.world)<br>Provides digital transformation solutions and expert services for architecture, engineering, construction, and manufacturing industries, optimizing design, build, and manufacturing processes. | IT Services and IT Consulting | 🇫🇷 Saint-Denis | 679 |  |
| 4 | [Hub One](https://www.tamtam.ai/c/hub-one) (hubone.fr)<br>Hub One, a technology group, provides digital evolution services for businesses in various sectors They offer connectivity solutions for communication, networking, and mobility | Telecommunications | 🇫🇷 Tremblay-en-France | 645 | 2001 |
| 5 | [CORELIA](https://www.tamtam.ai/c/corelia) (corelia.ai)<br>CORELIA correlates data for clients, blending expertise with project complexity through IT and business alignment, emphasizing data's importance in all projects | IT Services and IT Consulting | 🇫🇷 Saint-Denis | 402 | 1985 |
| 6 | [ekino](https://www.tamtam.ai/c/ekino) (ekino.fr)<br>Specializes in technology and artificial intelligence, helps companies build reliable and sustainable AI systems, focusing on product delivery and operational foundations. | IT Services and IT Consulting | 🇫🇷 Pantin | 328 | 2010 |
| 7 | [Cantor](https://www.tamtam.ai/c/cantor) (cantor.fr)<br>Cantor is a computer service and engineering company specializing in software and data engineering, including big data processing within strict deadlines | Software Development | 🇫🇷 Neuilly-Plaisance | 250 | 1996 |
| 8 | [MC3](https://www.tamtam.ai/c/mc3) (mc3.fr)<br>Wholesale IT distribution and logistics services across multiple geographic regions, supporting local resellers with recognized brand products and after-sales support. | Computer Hardware Manufacturing | 🇫🇷 Villepinte | 202 | 1995 |
| 9 | [INTERCOM Technologies](https://www.tamtam.ai/c/intercom-technologies) (intercom-technologies.fr)<br>Specialized in high-value project expertise and management, supporting strategy, providing expert assistance, and operating nearshore agency for quality and growth. | Telecommunications | 🇫🇷 Rosny-sous-Bois | 197 | 2005 |
| 10 | [LINKBYNET](https://www.tamtam.ai/c/linkbynet) (accenture.com)<br>A innovative company providing outsourcing and cloud computing solutions, focusing on digital infrastructure development, management, and security for business transformation | IT Services and IT Consulting | 🇫🇷 Saint-Denis | 196 | 2000 |
| 11 | [Calliope Business Solutions by TVH Consulting](https://www.tamtam.ai/c/calliope-business-solutions-by-tvh-consulting) (groupe-calliope.com)<br>Provides digital transformation through Microsoft and Sage ERP and CRM integration, utilizing packaged modules and structured methodology for retail, manufacturing, and services. | Software Development | 🇫🇷 Saint-Denis | 150 | 1995 |
| 12 | [EURO.TVS - TRAITEMENT VALEURS SERVICES](https://www.tamtam.ai/c/euro-tvs-traitement-valeurs-services) (eurotvs.fr)<br>Specializes in document processing, image-to-file conversion, real-time data integration, and secure physical or digital archiving with certified quality and environmental standards. | IT Services and IT Consulting | 🇫🇷 Aubervilliers | 125 | 1995 |
| 13 | [Compagnie Francaise Informatique](https://www.tamtam.ai/c/compagnie-francaise-informatique) (cfigroupe.com)<br>A French leader in IT distribution and services for medium and large enterprises, evolving into a business solutions integrator with flexible payment options | IT Services and IT Consulting | 🇫🇷 Saint-Denis | 117 | 1981 |
| 14 | [PI Services](https://www.tamtam.ai/c/pi-services) (piservices.fr)<br>Specialized in Microsoft enterprise platforms, providing digital transformation, infrastructure management, project handling, and innovation-driven IT services across regions. | IT Services and IT Consulting | 🇫🇷 Noisy-le-Grand | 91 | 1997 |
| 15 | [SQUIREL](https://www.tamtam.ai/c/squirel) (squirel.fr)<br>Specializing in rail sector IT systems, SQUIREL provides tailored solutions to operational and commercial challenges, enhancing client capabilities and competitiveness through experience-driven support | IT Services and IT Consulting | 🇫🇷 Saint-Denis | 88 |  |
| 16 | [ITNI S.A.S](https://www.tamtam.ai/c/itni-s-a-s) (itiltd.co.uk)<br>Engineering, manufacturing, and installation of complex systems for networks, telecommunications, data centers, security, and access control. | IT Services and IT Consulting | 🇫🇷 Saint-Denis | 86 | 2008 |
| 17 | [GLOBAL PARTNER](https://www.tamtam.ai/c/global-partner) (global-partner.fr)<br>Audit, optimize, and manage telecommunication and printing solutions, combining negotiation, consulting, and technical expertise for best user experience. | IT Services and IT Consulting | 🇫🇷 Neuilly-Plaisance | 76 | 2010 |
| 18 | [TRIGONE (part of the NRB Group)](https://www.tamtam.ai/c/trigone-part-of-the-nrb-group) (trigone.fr)<br>Provision of secure remote IT production continuity services across various platforms, supporting companies from large corporations to SMEs. | IT Services and IT Consulting | 🇫🇷 Montreuil | 71 | 1982 |
| 19 | [PARTELYA CONSULTING](https://www.tamtam.ai/c/partelya-consulting) (partelya.com)<br>Specialized consulting services for electronic payments, banking, and project management, focusing on front and back office operations, card manufacturing, and fraud prevention. | IT Services and IT Consulting | 🇫🇷 Neuilly-sur-Marne | 65 | 2008 |
| 20 | [Groupe SI BUREAUTIQUE FRANCE](https://www.tamtam.ai/c/groupe-si-bureautique-france) (sibureautique.com)<br>Established in 2005, a group of entities offering tailored solutions in printing, telephony, IT, and digital services to improve workplace efficiency | IT Services and IT Consulting | 🇫🇷 Montreuil | 64 | 2005 |
| 21 | [SoftwareOne France](https://www.tamtam.ai/c/softwareone-france) (softwareone.com)<br>Global provider of software and cloud solutions, specializing in license lifecycle management, migration, modernization, and digital transformation support. | IT Services and IT Consulting | 🇫🇷 Saint-Ouen-sur-Seine | 60 |  |
| 22 | [SARDEL Conseil](https://www.tamtam.ai/c/sardel-conseil) (sardel.fr)<br>Identifies young talent, provides specialized mainframe technology training, and facilitates placement into prestigious organizations to ensure sustainable long-term employment for computer science graduates. | Software Development | 🇫🇷 Noisy-le-Grand | 54 | 2016 |
| 23 | [ADENIS](https://www.tamtam.ai/c/adenis) (adenis.fr)<br>Innovative cybersecurity and IT services provider for small and medium-sized businesses, offering a competitive edge and future-oriented solutions to boost revenue | IT Services and IT Consulting | 🇫🇷 Bagnolet | 53 | 1999 |
| 24 | [InnovQube](https://www.tamtam.ai/c/innovqube) (innovqube.com)<br>Consulting and SaaS solutions specializing in cloud strategy, architecture optimization, security, automation, training, and digital transformation for businesses. | IT Services and IT Consulting | 🇫🇷 Noisy-le-Grand | 51 | 2024 |
| 25 | [Ingenium animalis](https://www.tamtam.ai/c/ingenium-animalis) (ingenium.fr)<br>French leader in pet data, collecting, processing, and analyzing information for over 40 million animals, ensuring their safety, health, and protection. | IT Services and IT Consulting | 🇫🇷 Montreuil | 51 | 2012 |
| 26 | [Zenconnect](https://www.tamtam.ai/c/zenconnect) (zenconnect.fr)<br>Network infrastructure integrator providing WiFi and Cloud solutions for business mobility, security, and quality of service through specialized technical support and services. | IT Services and IT Consulting | 🇫🇷 Montreuil | 48 | 2012 |
| 27 | [Wortis](https://www.tamtam.ai/c/wortis) (wortis.fr)<br>A Paris-based digital services company operating in system development, engineering, consulting, outsourcing, and telecommunications equipment across Europe and Africa | IT Services and IT Consulting | 🇫🇷 Bondy | 45 | 2014 |
| 28 | [au carré](https://www.tamtam.ai/c/au-carre) (aucarre.tech)<br>Development of custom no-code digital solutions to simplify internal processes, automate emails, improve client communication, and foster community engagement. | Software Development | 🇫🇷 Saint-Denis | 40 | 2022 |
| 29 | [AMBIENT IT - Academy](https://www.tamtam.ai/c/ambient-it-academy) (ambient-it.net)<br>Specialized consulting and training in new technologies including software development, DevOps, graphic design, and business intelligence solutions. | Professional Training and Coaching | 🇫🇷 Pantin | 39 | 2015 |
| 30 | [Resadia](https://www.tamtam.ai/c/resadia) (resadia.com)<br>Network of regional businesses providing customized converged IP solutions including IT services, telecommunications, security, and hardware installation for companies of all sizes. | IT Services and IT Consulting | 🇫🇷 Pantin | 38 | 2006 |

## 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 11, 2026.

## More company lists in the Seine-Saint-Denis department

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## The same list elsewhere in France

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Source: https://www.tamtam.ai/l/it-services-companies-seine-saint-denis