What STELR does

STELR is a French IT strategy and digital transformation consulting firm headquartered in Saint-Cloud, France, operating as a wholly-owned subsidiary of the Constellation group (an "Entreprise à Mission" with 800 employees across 14 French agencies). Founded in 2017 by Antoine Briere, the firm organizes its offering around five consulting practices: Technologie, Système d'information, Data et IA, Environnement, and Pilotage de projet — collectively described as a platform of project ownership assistance (assistance à maîtrise d'ouvrage) competencies. Under President Vincent Branger (appointed 2025), STELR employs approximately 50 consultants across 5 French agencies, serving both private and public-sector clients including Unédic, Hauts-de-Seine Habitat, Les Mousquetaires (STIME), a Grand groupe postal français with 230,000+ employees, mutual insurance groups, railway operators, and retirement funds.

STELR generates revenue through professional services engagements — IT strategy advisory, digital transformation delivery, environmental/climate consulting, infrastructure and cloud (including Container-as-a-Service implementations on Rancher/Kubernetes), cybersecurity and regulatory compliance (NIS2, RGPD, AI Act, DORA), and interim DSI leadership — typically billed on time-and-materials or fixed-fee structures. Its technology stack is methodology-driven rather than proprietary: the firm leverages partner platforms such as Ekyo (first-partner status for CSR/carbon management), and its differentiation rests on vendor independence, certifications (Bilan Carbone, Label Numérique Responsable level 2, Association Bas Carbone), and integration with Constellation's broader distribution and managed-services capabilities (ACG Synergies, Cloudity, Login Sécurité). Growth has been primarily inorganic since 2021, with the 2019 acquisition of AKAL Consulting and the 2024 acquisition of ILKI (adding 20 consultants) materially expanding capacity and capability.

The go-to-market is enterprise field sales targeting Chief Information Officers (DSI) and IT departments, supported by Constellation's commercial force since 2021. The firm uses content marketing (website, thought leadership on CSRD), the annual Move For Climate event (co-animated with Lenovo and Arrow in 2025), webinars, LinkedIn, and published client testimonials as demand-generation channels. Pricing is quote-based and not publicly disclosed. Customer concentration appears moderate based on a disclosed logo set spanning at least ten named engagements across multiple industries, though no revenue split is publicly available. The company has no disclosed venture or private equity funding, operates only in France, and reports revenue figures as not publicly disclosed.

Name

STELR

Legal name

STELR SAS

Website

https://stelr.fr

Company type

Private

Founded year

2017

Operating status

Operating

Headcount range

11–50 employees

Short description

STELR is a French IT strategy and digital transformation consulting firm, wholly owned by the Constellation group, serving enterprise and public-sector CIOs across five practices: technology, information systems, data and AI, environment, and project management.

Ownership category

akta.pro rank

Product category

IT Consulting Services

NAICS

Management Consulting Services (54161), Computer Systems Design and Related Services (54151)

SIC

Services-Management Consulting Services (8742)

akta.pro primary industry

Strategy & IT Advisory (BPAEAAAA)

akta.pro secondary industries

Operations & Process Improvement Consulting (BPAHACAB), ERP, CRM & Enterprise Applications Consulting (BPAHAEAI)

Keywords

• IT strategy consulting
• Digital transformation advisory
• Environmental consulting services
• IT governance consulting
• Project management consulting

Headquarters

HQ city

Saint-cloud

HQ country

France

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Technology or R&D, Others

Revenue model

1. Consulting Services: STELR generates revenue through IT strategy consulting, digital transformation advisory, environmental/climate consulting services, and project management services. As a consulting firm, services are delivered through professional engagements typically billed on a time and materials or fixed-fee basis for advisory, audit, implementation support, and managed services.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels5 records

Core offering

STELR is an IT strategy and digital transformation consulting firm that advises and accompanies French enterprises and public organizations on systems-of-information strategy, technology selection, data and AI initiatives, environmental/climate strategy, and project management. The firm operates through five practices (Technologie, Système d'information, Data et IA, Environnement, Pilotage de projet) and delivers engagements through on-site consulting, vendor-neutral advisory, interim DSI services, and managed implementation support including CaaS platforms and Ekyo-based carbon management.

Product overview

STELR is a consulting firm organized as a unified platform of five interconnected consulting practices: Technologie, Système d'information, Data et IA, Environnement, and Pilotage de projet. These practices work together to provide holistic IT strategy, digital transformation, and environmental consulting services to DSI and business stakeholders. The firm operates as part of the Constellation group and employs 50 consultants across 5 agencies in France.

Differentiator

Problem solved

Functional benefit

Products and services

• Technologie (Technology Consulting) Technology consulting practice that advises organizations on IT roadmap strategy, cloud and Cloud Native architectures, infrastructure modernization, Digital Workplace transformation, resilience planning (PRI/PCI), and NIS2 cybersecurity compliance. Targets DSI and IT departments of mid-sized and large French enterprises and public organizations.
• Système d'information (Information Systems Consulting) Information systems consulting practice covering SI strategy, IT governance and management, delegated DSI and transition leadership, organization and process optimization, project and vendor management, and regulatory compliance (RGPD, NIS2, AI Act, DORA). Targets CIOs and IT leadership seeking strategic alignment and operational efficiency of their SI.
• Data et IA (Data and AI Consulting) Data and AI consulting practice covering data strategy, datalake/data warehouse/data hub implementation, BI/DataViz/Data Science/Machine Learning tools, AI awareness workshops, use case identification and prioritization, POC development, and industrialization roadmap. Targets organizations seeking to operationalize data and AI capabilities.
• Environnement (Environmental and Climate Consulting) Environmental and climate consulting practice covering climate fresco workshops, carbon footprint assessment (Bilan Carbone, BEGES, GHG Protocol), life cycle analysis (ACV), environmental strategy definition, CSRD compliance audit, Responsible Digital label certification, and sustainable procurement charter development. Targets organizations subject to environmental regulations or pursuing voluntary climate strategies.
• Pilotage de projet (Project Management Consulting) Project management consulting practice covering project diagnostic and strategic alignment, project structuring and launch, operational governance and reporting, risk management, and change management support. Targets organizations running complex transformation programs requiring external PMO expertise.

Quantifiable outcome

• Infrastructure cost reduction from €9k to €5k per month
• +3 more outcomes

Named customers10 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Six partnerships are on record, tiered core and minor.

• Kanopée (Constellation Group)coreStrategic or Co-development PartnerKanopée is the training center of Constellation group. STELR collaborates closely with Kanopée, with many STELR consultants serving as trainers. This bridge between consulting and training ensures pedagogical, accessible, and sustainable approach to SI transformation projects, strengthening client understanding and adoption of new technologies.
• EkyocoreTechnology or IntegrationEkyo is a CSR and carbon management SaaS platform. STELR is the first partner of Ekyo, using their platform for carbon tracking and ESG management. Both companies are part of Constellation group. STELR implements Ekyo for clients as part of environmental strategy engagements.
• LenovominorStrategic or Co-development PartnerLenovo participated as co-animator in Move For Climate 2025 event alongside STELR, Arrow, and Constellation, representing the digital ecosystem's environmental transition initiatives.
• ArrowminorStrategic or Co-development PartnerArrow participated as co-animator in Move For Climate 2025 event alongside STELR, Lenovo, and Constellation, representing the digital ecosystem's environmental transition initiatives.
• GIE ACG SynergiescoreChannel Partner/ Reseller/ DistributorACG Synergies is the managed services partner for Hauts-de-Seine Habitat, providing hosting and infrastructure management. STELR managed the outsourcing project transition to ACG Synergies, demonstrating a partnership model where STELR orchestrates technology partners for client delivery.
• ILKIcoreStrategic or Co-development PartnerILKI was acquired by STELR in 2024. The acquisition brought 20 consultants strengthening STELR's technological transition expertise. ILKI was a consultancy specializing in technological transition, now fully integrated into STELR.

Scale indicators4 records

Recent moves9 records

Expansion highlights5 records

Direct peers

• Wavestone: French IT and management consulting firm advising CIOs and executive committees on IT strategy, digital transformation, cybersecurity, and ESG — closely aligned with STELR's DSI-focused value proposition, though significantly larger (1,500+ consultants).
• Onepoint: French consulting and technology firm offering digital transformation, cloud, data, and cybersecurity services to large enterprises and public organizations — overlaps with STELR's SI strategy and transformation practices at a larger scale.
• mc2i Groupe: Independent French management and IT consulting firm focused on digital transformation, HR, and transformation programs — comparable boutique-to-mid-tier profile serving similar French enterprise and public-sector clients.
• Devoteam: French-headquartered IT consulting firm specializing in digital transformation, cloud, data, and cybersecurity, serving mid-market and large enterprises — directly overlapping with STELR's technology, cloud-native, and cybersecurity compliance practices.
• TNP Consultants: French independent consultancy specialized in business transformation, digital, and regulatory compliance (finance, insurance, energy) — competes with STELR for CIO and digital transformation mandates in France.
• VISEO: Global technology and digital transformation consultancy with strong French roots, offering cloud, data, and CRM/ERP advisory — competes with STELR's data, ERP, and enterprise application practices.
• Hardis Group: French IT consulting and software publisher with practices in digital transformation, supply chain, and cloud — comparable mid-sized player serving French enterprises with similar CIO-adjacent engagements.

Broad incumbents

• Capgemini (France): Global IT services and consulting giant with a major French practice covering strategy, digital transformation, cloud, and cybersecurity — competes with STELR on large enterprise mandates but at vastly greater scale and breadth.
• Accenture (France): Global professional services firm with a substantial French consulting footprint spanning strategy, technology, and operations — sets the upper bound of competition for premium CIO advisory engagements.
• Sopra Steria: Major European IT services and consulting group headquartered in France, offering digital transformation, infrastructure, and application services — competes with STELR especially on public-sector IT transformation projects.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Subsidiaries3 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A1 record

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about STELR