Our history in brief

In order to complete its offer, Castelis decided in 2004 to buy ILX Consulting, an infrastructure specialist, which became the Cloud Business Unit of Castelis, and then in 2014 Access it, a Microsoft pure player, in Villeneuve d’Ascq.

In 2014, the group continues its growth and expands with the birth of a new company: Treez Data Management, Data specialist, located in the Lille region. The following year, he created Sudalis, a web agency specialized in custom development, located in Toulouse.

Then in 2018, he extends his expertise with the purchase of Yoozly, a web agency based in the Lille area.

2018 is also the year of expansion of the company in Asia with the investment in LiveWell Solutions Ltd and soon after a partnership with SourceWell Global Inc. in the Philippines that eventually led to the creation of Castelis Asia Inc. in November 2020 in Manila.

In 2020, the agency Ylly, a specialist in Customer Experience topics, joins the group, in its Parisian offices.

Finally, in 2022, the Castelis group will become hunik group and will be enriched with new expertise with a 7th company: Everbrand, an agency specialized in brand development.

Our 5 business expertises

ERP and Financial Services

ERP integration and development of customized financial and accounting services

Customer - user experience

Design of engaging user experiences. Development of customized service platforms.

Digital workplace

Digital collaboration solutions. Corporate intranet.

Cloud and security

Cloud governance. Infrastructure security. RGPD compliance.

AI & Data for performance

Collection, analysis and exploitation of data for performance.

About hunik group

Different needs require different solutions…

Historical partner of Microsoft, Access it accompanies you on the digitalization of business processes and collaborative uses, via the development of management applications or the integration of Microsoft solutions such as Office 365.
More about Access it

Specialized in the development of customized solutions, with strong business expertise in finance, e-commerce and accounting/management. Ambitious technological partnerships with Microsoft and Sitecore.

Specialized in brand strategy & branding, Everbrand accompanies you on your corporate, internal & HR communication projects, in coherence with your values to give meaning to your actions and words.
More about Everbrand

Based in Toulouse, the Sudalis team helps you create custom applications: software development, reporting tools, data administration, intranet / extranet or business applications.
More about Sudalis

Expert in data collection, analysis and exploitation. Treez advises and implements the new uses of business intelligence, helping customers to exploit the potential of their company's data.
More about Treez

Expert in Open-source development, Symfony, Wordpress, React Native ..., Ylly develops optimal user experiences and deploys performance marketing strategies by activating the appropriate digital levers.
More about Ylly

Agency specialized in user experience design and front-end development. We support you in your digital transformation, UX design and web development of your solutions.
More about Yoozly

Key points from our history



Founded in 1999, Castelis is a computer engineering company (ESN) headed by four co-managers Fabien Balavoine, Sebastien Huet, David Lelong and Stéphane Woelffel.

A Propos-Notre reseau dentreprises-histoire-1999



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

A Propos-Notre reseau dentreprises-histoire-2014



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

A Propos-Notre reseau dentreprises-histoire-2015



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

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

A Propos-Notre reseau dentreprises-histoire-2010



Castelis develops its activities in the Philippines with LiveWell Solutions Ltd in April and August 2018, then with SourceWell Global Inc from September 2018 to October 2020, before creating Castelis Asia to ensure its customers a 24/24 service.

Experte traitant des forfaits d'infogérance clairs et maîtrisés



Castelis expands and welcomes the agency Ylly.

Ylly is specialized in building digital strategies through UX design, interface creation, web & mobile development and SEO and SXO data analysis. It is a complete offer of expertise that we propose to our customers.

Groupe Ylly



The Castelis group changes its name and becomes hunik group.

It allows to better value the complementarity of the expertises and the competences of each company of the group. More clarity, more trust and an ever more central support to give life to ever more ambitious joint projects.

site internet hunik group nouvelle marque groupe castelis

Our presence in France and international

hunik group and its various subsidiaries are present in France in the main economic centers: Paris, Lille, Nantes, Lyon and Toulouse.

Also present in Asia and the Philippines, hunik group and Castelis are able to provide 24/7 support for its key accounts.

hunik group key figures



25 M€

of turnover


years of expertise


expert companies