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Professional services firms headquartered in Boulogne-Billancourt

Tamtam tracks 102 professional services firms headquartered in Boulogne-Billancourt. This list ranks the 30 largest by number of employees on LinkedIn, led by ALTEN, Astek and Synergie France. Their median headcount is 603. Half of them were founded in 2004 or later.

🇫🇷 Boulogne-Billancourt30 companiesUpdated Nov 14, 2026

The professional services sector in Boulogne-Billancourt is characterized by a strong presence of IT and engineering consulting firms. These companies, ranging from mid-sized to large enterprises, offer specialized expertise in digital transformation, IT services, and various engineering fields. Key players include ALTEN, which provides engineering and IT services, and Astek, focusing on sustainable digital transformation. BNP Paribas Real Estate offers comprehensive real estate services, while Synergie France specializes in HR services.

Several companies, such as Viveris and Apside, concentrate on information systems and technical computing. The presence of firms like Excelya and AIXIAL GROUP indicates a cluster of expertise in clinical development and pharmaceutical services. A common thread across many of these firms is their focus on high-value consulting and technical support for businesses seeking digital and technological advancement.

#CompanyIndustryHeadquarters EmployeesFounded
1
ALTENalten.com

Provides engineering and IT services, supporting businesses in technological and sustainable transformation across various industries with high-level consultant-engineers.

Engineering Services 🇫🇷 Boulogne-Billancourt 38,710 1988
2
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.

IT Services and IT Consulting 🇫🇷 Boulogne-Billancourt 6,035 1988
3
Synergie Francesynergie.fr

French leader in HR services: recruitment, training, and HR consulting Providing solutions in various sectors, emphasizing proximity, performance, and diversity

Human Resources Services 🇫🇷 Boulogne-Billancourt 4,804 n/a
4
BNP Paribas Real Estatebnpparibas.com

Offers comprehensive real estate services including property development, transactions, consulting, valuation, and property management across Europe, the Middle East, and Asia.

Real Estate 🇫🇷 Boulogne-Billancourt 4,173 1963
5
VISEOviseo.com

Assists clients globally with digital and business transformation using advanced technology and industry expertise for productivity, innovation, and competitiveness.

IT Services and IT Consulting 🇫🇷 Boulogne-Billancourt 3,016 1999
6
Apsideapside.com

Provides consulting, engineering in Information Systems, Technical and Scientific Computing, Automotive and Financial Engineering, for large French and European groups.

IT Services and IT Consulting 🇫🇷 Boulogne-Billancourt 2,300 1976
7
agap2agap2.com

Global consulting firm specializing in industries and information systems, creating value for customers and consultants through innovation and extensive technical know-how.

Business Consulting and Services 🇫🇷 Boulogne-Billancourt 2,075 2005
8
Davidson consultingdavidson.fr

A management consulting and technology company with over 2,000 employees, expanding internationally with a focus on employee well-being and creativity

Business Consulting and Services 🇫🇷 Boulogne-Billancourt 1,843 2005
9
Rentokil Initial Francerentokil-initial.com

Pest control, hygiene solutions, cleaning, catering, interior landscaping, package delivery, and integrated facilities services for diverse customers.

Environmental Services 🇫🇷 Boulogne-Billancourt 979 1927
10
Viverisviveris.fr

consulting and engineering company for information systems, technical computing, and embedded systems, providing support from definition to integration.

Software Development 🇫🇷 Boulogne-Billancourt 899 1986
11
Nomios Groupnomios.com

Designs, secures, and manages digital infrastructures, developing innovative cybersecurity and networking solutions through consulting, managed, and professional services for organizations.

Computer and Network Security 🇫🇷 Boulogne-Billancourt 887 2004
12
Bee Engineeringbee-eng.com

Specializing in energy, processes, infrastructure, and transportation industries, we are a team of over 800 ambitious professionals based in 10 major cities

Business Consulting and Services 🇫🇷 Boulogne-Billancourt 859 2010
13
Excelyaexcelya.com

Provides comprehensive CRO, FSP, and Resourcing solutions to Biotech, Pharma, and Medical Device organizations, offering bespoke trial solutions across various therapeutic areas.

Pharmaceutical Manufacturing 🇫🇷 Boulogne-Billancourt 701 2014
14
AIXIAL GROUPaixialgroup.com

Specialized partner in clinical development, providing comprehensive trial design, execution, functional service delivery, resources, and expert consulting for efficient clinical trials.

Research Services 🇫🇷 Boulogne-Billancourt 616 2004
15
PRIME ENGINEERING Franceprimeengineering.fr

Engineering consulting firm, specializing in energy, infrastructure, and IT/telecom sectors, providing expertise and know-how since 2006.

Business Consulting and Services 🇫🇷 Boulogne-Billancourt 603 2013

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16
METSYSmetsys.fr

Advises clients on cybersecurity, infrastructure, and cloud solution design and implementation. Over 500 employees across France, 93.2M  in revenue.

IT Services and IT Consulting 🇫🇷 Boulogne-Billancourt 435 2011
17
MEOGROUPmeogroup-partners.com

Specializing in consulting services for a wide range of industries, providing operational solutions and recruitment services for companies of all sizes

Business Consulting and Services 🇫🇷 Boulogne-Billancourt 428 2005
18
SARAWAK FRANCEsarawak.fr

Specializing in outsourced sales forces, animations in stores, and maximizing brand performance through motivated talents for consumer-centric results

Business Consulting and Services 🇫🇷 Boulogne-Billancourt 392 1999
19
Audensielaudensiel.com

Supports clients in digital transformation projects, providing IT and business consulting, data/AI solutions, cybersecurity, and cloud/DevOps expertise.

IT Services and IT Consulting 🇫🇷 Boulogne-Billancourt 391 2013
20
ADENTISadentis.fr

High-tech consulting company developing software and embedded systems for digital TV, telecom, medical electronics, defense, and aeronautics. Research lab.

IT Services and IT Consulting 🇫🇷 Boulogne-Billancourt 362 2000
21
Concentrix Medicamedica.concentrix.com

Support pharmaceutical companies in promoting and selling products to healthcare professionals, plus patient coaching and disease management expertise.

Business Consulting and Services 🇫🇷 Boulogne-Billancourt 327 2000
22
MEOTECmeotec.com

Operational consulting firm providing support in project management, purchasing, supply chain, economic performance, quality, processes, IS, and technology.

Business Consulting and Services 🇫🇷 Boulogne-Billancourt 325 2005
23
Lincoln Francelincoln.fr

Offers data science and Modern BI expertise, consulting, and support for decision-making projects, utilizing predictive analysis and machine learning algorithms.

IT Services and IT Consulting 🇫🇷 Boulogne-Billancourt 316 1990
24
INGEVAingeva.fr

Specialized in sustainable mobility engineering, this company supports public and private actors from design studies to project realization, including major rail and construction projects.

Business Consulting and Services 🇫🇷 Boulogne-Billancourt 293 2014
25
Parthena Consultantparthena.com

Integrates and supports management solutions like accounting, commercial management, payroll, CRM, and business management, offering services from analysis to hotline support.

IT Services and IT Consulting 🇫🇷 Boulogne-Billancourt 264 1990
26
ELITYSelitys.fr

Elitys supports clients in Industry and Life Science projects, providing engineering expertise from industrialization to continuous improvement in collaboration with internal teams

Business Consulting and Services 🇫🇷 Boulogne-Billancourt 262 2005
27
ITS Servicesitsservices.fr

ITS Services is a leading company in IT Infrastructure & Operations, offering expertise in Observability, SRE, and AIOps for accelerated time to market

IT Services and IT Consulting 🇫🇷 Boulogne-Billancourt 240 1997
28
Cellenzacellenza.com

Provides IT consulting and implementation services, specializing in Microsoft Cloud solutions, including advisory, security, data, AI, and application development, aiding digital transformation.

IT Services and IT Consulting 🇫🇷 Boulogne-Billancourt 223 2011
29
GROUPE FACTORIAfactoria-groupe.fr

Providing specialized IT, telecom, printing, office furniture, and interactive screen solutions tailored for SMEs, professionals, and administrations in France.

IT Services and IT Consulting 🇫🇷 Boulogne-Billancourt 212 2006
30
Degeteldegetel.com

Provides digital transformation consulting, implements concrete solutions, simplifies user experience, and manages end-to-end business challenges for clients.

IT Services and IT Consulting 🇫🇷 Boulogne-Billancourt 180 1999

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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 14, 2026.

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