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Our Network of Companies

Our network of companies

In order to complete its offering, in 2004 Castelis decided to acquire ILX Consulting, an infrastructure specialist which has become Castelis’ Cloud Business Unit, and then in 2014 Access it, based at Villeneuve d’Ascq, a Microsoft pure player.

In 2015, the group continued to expand and grew with the founding of new companies: Treez Data Management, a data specialist, installed in the Lille area and Sudalis, a Web Agency located in Toulouse and then Yoozly, a Web Agency based on the Lille premises.

Finally in 2020, the Ylly agency, a Customer Experience specialist, joined the group.

The 5 strands of our business expertise

ERP and Financial services

EPR integration and development of custom-made financial and accounting services.

Customer experience - users

Design of engaging user experiences. Development of custom-made services platforms.

Digital workplaces

Digital collaboration solutions. Corporate intranets.

Cloud and security

Cloud governance. Infrastructure security. GDPR compliance

AI & Data for performance

Data collection, analysis and use for performance.

Presentation of the Group

Different needs require different, tailored solutions

Expert in custom-made .NET development. A Microsoft partner assisting companies with deployment, governance, and managing change around Office 365.

Specialized in custom development, with strong business expertise in finance, e-commerce and accounting-management. Strong technology partnerships with Microsoft and Sitecore.

With the agency based in Toulouse, the Sudalis team helps you produce custom applications: Software development, reporting tools, data administration, intranet/extranet or business applications.

Expert in data collection, analysis and use. Treez advises on and applies the new uses of business intelligence, helping customers realize the potential of their corporate data.

An expert in Open-source development, Symfony, Wordpress, React Native ..., Ylly develops effective user experiences.

An agency specialized in user experience design and front-end development.

The key milestones of our history

1999

FOUNDATION OF CASTELIS

Founded in 1999, Castelis is an IT consultancy with four co-managers Fabien Balavoine, Sébastien Huet, David Lelong and Stéphane Woelffel.

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A Propos-Notre reseau dentreprises-histoire-1999

2014

ACQUISITION OF ACCESS-IT

Through this acquisition, Castelis strengthens its Microsoft expertise (collaborative solutions and BI) and extends its coverage to the Nord-Pas-de-Calais region.

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A Propos-Notre reseau dentreprises-histoire-2014

2015

FOUNDATION OF TREEZ DATA MANAGEMENT

Treez was launched in 2015 by 3 partners, Rémi, Arnaud and Olivier, all three of whom are passionate about Business Intelligence.

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A Propos-Notre reseau dentreprises-histoire-2015

2018

YOOZLY JOINS THE CASTELIS GROUP

In order to be able to respond to all the market challenges, the Castelis Group wishes to diversify its areas of expertise while strengthening its IT engineering know-how.

On 1 January 2018, Benefice-Net joins the Castelis group and changes its name!

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A Propos-Notre reseau dentreprises-histoire-2010

2020

YLLY JOINS THE CASTELIS GROUP

Castelis grows and welcomes the Ylly agency.

Ylly specializes in building digital strategies through user experience design, the creation of interfaces, web and mobile development, and the analysis of SEO and SXO data. We offer our customers a comprehensive offering of expertise.

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Our presence in France and internationally

The Castelis Group and its various subsidiaries are present in France in the main economic centres: Ivry-sur-seine, Lille, Nantes, Lyon and Toulouse.

Also present in Asia, in the Philippines, the Castelis Group is thus able to provide 24/7 support to its large account customers.

Key figures of the network

250

employees

16 M€

of turnover

years of expertise

expert companies