# List of professional services firms in the Seine-Saint-Denis department

Tamtam tracks 71 professional services firms headquartered in the Seine-Saint-Denis department. This list ranks the 30 largest by number of employees on LinkedIn, led by SPIE Facilities, Randstad France and SPIE Building Solutions (France). Their median headcount is 250. Half of them were founded in 1999 or later. The most common headquarters are Saint-Denis (10), Montreuil (5) and Aubervilliers (4).

These professional services firms in Seine-Saint-Denis mostly comprise mid-sized and large companies. Recurring activities include facilities management, human resources, and environmental services. This selection features SPIE Facilities, which maintains buildings and facilities with a focus on energy performance, and Randstad France, offering recruitment and HR management solutions. Also present are Groupe Institut de Soudure, providing joining technology services, and Solutions30 France, which delivers technological solutions in IT, telecom, and energy.

The companies on this list exhibit a concentration of headquarters in certain communes, with Saint-Denis and Aubervilliers being notable hubs. Several firms specialize in similar areas, such as the multiple entities under the Randstad and Veolia groups, indicating a strong presence of these larger corporate structures in the department.

🇫🇷 Seine-Saint-Denis · 30 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [SPIE Facilities](https://www.tamtam.ai/c/spie-facilities) (spie.fr)<br>Maintenance of buildings and facilities across France, focusing on energy performance, technical expertise, and sustainable facility management services. | Facilities Services | 🇫🇷 Saint-Ouen-sur-Seine | 2,066 | 2017 |
| 2 | [Randstad France](https://www.tamtam.ai/c/randstad-france) (randstad.fr)<br>This company offers tailored recruitment and HR management solutions, connecting businesses with talent for various sectors including industry, IT, engineering, and finance. | Human Resources Services | 🇫🇷 Saint-Denis | 1,511 | 1973 |
| 3 | [SPIE Building Solutions (France)](https://www.tamtam.ai/c/spie-building-solutions-france) (spie.fr)<br>Specializing in reducing building carbon footprint through intelligent solutions and expertise, this organization promotes safer, connected, comfortable, and high-performing buildings | Facilities Services | 🇫🇷 Saint-Ouen-sur-Seine | 1,415 | 2003 |
| 4 | [Groupe Institut de Soudure](https://www.tamtam.ai/c/groupe-institut-de-soudure) (isgroupe.com)<br>Provides joining technology services, testing, inspection, and training worldwide, supporting design, manufacturing, and maintenance with safety and quality focus. | Mechanical Or Industrial Engineering | 🇫🇷 Villepinte | 1,262 | 1905 |
| 5 | [Randstad Inhouse](https://www.tamtam.ai/c/randstad-inhouse) (randstad.fr)<br>Providing dedicated onsite HR teams to industrial companies, managing recruitment, flexibility, and productivity to meet production goals efficiently. | Human Resources Services | 🇫🇷 Saint-Denis | 972 |  |
| 6 | [Groupe Randstad France](https://www.tamtam.ai/c/groupe-randstad-france) (grouperandstad.fr)<br>Specialist in HR services, offering recruitment, integration, management, training, and mobility solutions to companies and candidates, with a strong focus on shaping the world of work | Human Resources Services | 🇫🇷 Saint-Denis | 903 |  |
| 7 | [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 |  |
| 8 | [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 |
| 9 | [Veolia \| Engineering & Consulting](https://www.tamtam.ai/c/veolia-engineering-and-consulting) (engineering-consulting.veolia.com)<br>Consulting engineering and strategic assistance division specializing in designing sustainable solutions for public, industrial, and tertiary sectors, focusing on resource management and performance improvement | Environmental Services | 🇫🇷 Aubervilliers | 436 |  |
| 10 | [Veolia Industries Global Solutions](https://www.tamtam.ai/c/veolia-industries-global-solutions) (industries.veolia.com)<br>Specializes in energy efficiency and performance solutions, focusing on optimizing industrial energy use and sustainability practices. | Environmental Services | 🇫🇷 Aubervilliers | 417 | 1997 |
| 11 | [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 |
| 12 | [Defense Environnement Services](https://www.tamtam.ai/c/defense-environnement-services) (industries.veolia.com)<br>Specializes in industrial maintenance, facility management, and logistics for complex defense environments including production sites, offices, and military bases. | Environmental Services | 🇫🇷 Aubervilliers | 354 | 2009 |
| 13 | [Atalian Sécurité](https://www.tamtam.ai/c/atalian-securite) (atalian.fr)<br>Specialized security company with a dedicated team collaborating with major French and international groups, offering a unique and cosmopolitan Security Journey | Security and Investigations | 🇫🇷 Aubervilliers | 315 | 1977 |
| 14 | [GIDEF](https://www.tamtam.ai/c/gidef) (gidef.org)<br>A consulting firm offering professional reclassification support, engineering programs, competency assessments, education needs analysis, and social/economic studies for strategic decision-making | Professional Training and Coaching | 🇫🇷 Rosny-sous-Bois | 281 | 1994 |
| 15 | [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 |
| 16 | [GLI](https://www.tamtam.ai/c/gli) (gli.fr)<br>Technical engineering and consultancy services for smart buildings focusing on energy efficiency, fire safety, cybersecurity, and electrical systems through project management and support. | Research Services | 🇫🇷 Montreuil | 250 | 1986 |
| 17 | [EMG](https://www.tamtam.ai/c/emg-saint-denis) (gravitymedia.com)<br>A leading provider of broadcast services and media solutions for live sports, entertainment, and events with a global presence | Media Production | 🇫🇷 Saint-Denis | 224 | 1983 |
| 18 | [ARTEMIS Group / 7 filiales](https://www.tamtam.ai/c/artemis-group-7-filiales) (groupartemis.fr)<br>Family-owned private security firm providing human guarding, mobile patrols, professional training, fire protection, electronic security, remote monitoring, and event hosting services across France. | Security and Investigations | 🇫🇷 Saint-Denis | 211 | 2010 |
| 19 | [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 |
| 20 | [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 |
| 21 | [OGI - OMNIUM GÉNÉRAL D'INGENIERIE](https://www.tamtam.ai/c/ogi-omnium-general-d-ingenierie) (ogi2.fr)<br>OGI is a specialized engineering firm for public space development, offering a range of technical expertise for all aspects of project planning | Architecture and Planning | 🇫🇷 Montreuil | 190 | 1991 |
| 22 | [COTEBA](https://www.tamtam.ai/c/coteba) (arteliagroup.com)<br>European leader in engineering and project management, specializing in construction, infrastructure, and environment projects with a focus on professionalism, ethics, and sustainability | Construction | 🇫🇷 Saint-Denis | 154 | 1961 |
| 23 | [aéroportuaire](https://www.tamtam.ai/c/aeroportuaire) (sodaic.fr)<br>An aviation and aerospace company headquartered in France, specializing in aircraft technologies and solutions within the industry | Aviation and Aerospace Component Manufacturing | 🇫🇷 Tremblay-en-France | 147 |  |
| 24 | [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 |
| 25 | [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 |  |
| 26 | [INEX BET](https://www.tamtam.ai/c/inex-bet) (inex.fr)<br>Support architects and developers in designing sustainable, efficient buildings with expertise in HVAC, MEP engineering, green standards, and BIM innovation. | Construction | 🇫🇷 Montreuil | 54 | 1978 |
| 27 | [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 |
| 28 | [Altametris](https://www.tamtam.ai/c/altametris) (altametris.com)<br>A French expert in generating geotechnical data for industrial infrastructure operators, specializing in 3D mapping, land surveys, BIM modeling, and more | IT Services and IT Consulting | 🇫🇷 Saint-Denis | 53 | 2017 |
| 29 | [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 |
| 30 | [AMOPRIM/AMODEV](https://www.tamtam.ai/c/amoprim-amodev) (amodev.eu)<br>Specialized in real estate project consulting for public actors, investors, and developers Services include auditing, project management, environmental assistance, and more | Real Estate | 🇫🇷 Montreuil | 49 | 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 12, 2026.

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## The same list elsewhere in France

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- [Professional services firms in Île-de-France](https://www.tamtam.ai/l/professional-services-firms-ile-de-france) (3,377)
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- [Professional services firms in the Hauts-de-Seine department](https://www.tamtam.ai/l/professional-services-firms-hauts-de-seine) (629)
- [Professional services firms in Provence-Alpes-Côte d'Azur](https://www.tamtam.ai/l/professional-services-firms-provence-alpes-cote-dazur) (433)
- [Professional services firms in the Rhône department](https://www.tamtam.ai/l/professional-services-firms-rhone) (400)
- [Professional services firms in Occitanie](https://www.tamtam.ai/l/professional-services-firms-occitanie) (399)
- [Professional services firms in Grand Est](https://www.tamtam.ai/l/professional-services-firms-grand-est) (316)
- [Professional services firms in Nouvelle-Aquitaine](https://www.tamtam.ai/l/professional-services-firms-nouvelle-aquitaine) (308)
- [Professional services firms in Hauts-de-France](https://www.tamtam.ai/l/professional-services-firms-hauts-de-france) (260)
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- [Professional services firms in the Haute-Garonne department](https://www.tamtam.ai/l/professional-services-firms-haute-garonne) (208)
- [Professional services firms in the Nord department](https://www.tamtam.ai/l/professional-services-firms-nord) (178)
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- [Professional services firms in the Gironde department](https://www.tamtam.ai/l/professional-services-firms-gironde) (151)
- [Professional services firms in Normandy](https://www.tamtam.ai/l/professional-services-firms-normandy) (114)
- [Professional services firms in the Yvelines department](https://www.tamtam.ai/l/professional-services-firms-yvelines) (108)
- [Professional services firms in Paris](https://www.tamtam.ai/l/professional-services-firms-paris) (2,241)
- [Professional services firms in Lyon](https://www.tamtam.ai/l/professional-services-firms-lyon) (265)
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## The same list elsewhere

- [Professional services firms in the world](https://www.tamtam.ai/l/professional-services-firms-in-the-world) (24,737)
- [Professional services firms in Europe](https://www.tamtam.ai/l/professional-services-firms-in-europe) (13,698)

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Source: https://www.tamtam.ai/l/professional-services-firms-seine-saint-denis