OUR COMPANY
We are a fully independent group of companies specialised in managing complex IT projects and systems.
Our vision and values
Arηs analyses complexity and delivers simplicity in order to improve our society through reliable, efficient IT Systems. Our vision is to be the most caring and reliable IT company on the marketplace for both our clients and our people. Our values are: caring, agility, excellence, innovation, continual improvement. Our values support our vision by leveraging excellence, striving for results, ensuring commitment and promoting adaptability.
Our culture
We work in close partnership with our customers, turning their needs into benefits; We promote a dynamic local environment where both young and experienced people can realize themselves; We believe in state-of-the-art technologies and bleeding-edge methods; We leverage a flexible, independent, and responsive organisation.
Our brand
Name Arηs (pronounce [aris]) comes from Greek mythology. Arηs is the son of Zeus and the God of War – in our eyes, an accurate representation of the intelligence, strategy, leadership and vision that are essential in business. The “η” is a Greek eta, pronounced [i] in modern Greek. Our logo is a blend of the Greek letter eta and a Greek soldier’s helmet.
306
Turnover (Mio. eur)
2500
Consultants
19.8
EBIT (Mio. eur)
Meet the management
Christophe Grosjean
CEO
Christophe Grosjean holds a Master Degree in Computer Science and a Postgraduate in Law and Management of ICT from the University of Namur (UNamur), where he also worked during one year as researcher in human-computer interaction. He joined Business Solutions Builders as consultant in IT development projects for the financial sector in Brussels (Puilaetco) and Luxembourg (Lombard). In 2005, Christophe joined Arηs Developments as Software Architect, Delivery Manager and finally Project Director for European Commission projects. In 2014, Christophe launched Arηs Spikeseed, an entity of Arηs Developments, focused on innovation where he initiated the creation of several competence centers (mobile, data, public cloud…). He is also launched a second entity of the group Fleetback, focused on the development or a SaaS solution for the automotive sector. Christophe became the Chief Executive Officer of the Arηs Group in July 2024. Mr Grosjean was born in 1977 and is of Belgian nationality.
Meet the management
Jourdan
Founder & Advisor
After his Science education at the University of Liege, Mr Serderidis started his career in 1988 at Wang in Belgium and joined Olivetti in 1991 on several commercial positions in the European Institutions department that he led from 1995 until 1997. In 1997 he joined Intrasoft as Sales & Marketing Manager and participated actively in its growth. Mr Serderidis founded Cronos Technologies in 1999 (together with Cronos nv main shareholders) and then left in 2002 and founded Arηs together with his first line management. Mr Serderidis has been awarded “finalist of the Entrepreneur of the Year” in 2009 in Luxembourg. Mr Serderidis was born in 1964 and is of Greek nationality.
Meet the management
Pierre Noël
Partner
Mr Noel is co-founder of Arηs Developments. He holds a Civil Engineer Degree from the University of Liege and a Postgraduate degree from the Solvay Business School. He built his career at IBM, Cockerill Sambre, Sema-Group and PricewaterhouseCoopers in Belgium. Through these positions, he has gained a wide experience in project management, systems implementation and finance process improvements. At Arηs Developments, Pierre is managing and synchronizing the operations. Mr Noel was born in 1963 and is of Belgian nationality.
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Jean-Philippe Roch
Partner
Mr Roch is co-founder of Arηs Developments and holds a Commercial Engineer degree from the Solvay Business School (University of Brussels) and obtained a Postgraduate degree in International Taxation. He has a 12 years experience as corporate tax specialist at Deloitte & Touche Luxembourg and HRT which enables him to gain wide skills in tax, audit, finance, accountancy and company Law. Mr Roch was born in 1970 and is of Belgian nationality.
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Jean-François Pitz
Technical Director
Mr Pitz holds a Civil Engineer Degree from the University of Liege. He worked in an I.T. service company from 1993 until 2002 as development Architect and Project Leader, especially for financial institutions in Luxembourg. In 2002, he joined Cronos Technologies then started Arηs together with Mr Noel, Roch and Serderidis. Mr Pitz is responsible for the technical orientation of the company and all technical matters related to projects. Competence centers and internal systems are also under his responsibility. Mr Pitz was born in 1969 and is of Belgian Nationality.
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Marc Salm
BID Director
Mr Salm studied Computer Science at the Universities of Trier and Hagen. After joining Mediacare in 2000, he took the role of Team Leader and Project Manager. In 2007 Mr Salm joined Arηs Developments as Senior Analyst Developer and then Delivery Manager for European Commission projects. In 2009, Mr Salm is appointed as Bid Director and is entering in the Management Board. Mr Salm was born in 1976 and is of German nationality.
Meet the management
Karlien Gladine
Sales director & managing director ARΗS Developments Italia
Karlien Gladine holds a Master in Economics with a specialization in Human Resource Management (EHSAL). After graduating in 2001, she built her career in several IT companies such as Ariane II and Intrasoft, from Recruitment Consultant till Sales & Delivery Manager. She joined Arηs Developments in 2010. She became Sales Director and entered the Management Board in 2015. Karlien was born in 1978 and is of Belgian nationality.
Meet the management
Paulo Apolinario
Managing director ARΗS Cube and ARΗS Portugal
Mr Apolinario holds a Degree in Computer Science from the Centre Universitaire de Luxembourg (www.uni.lu). He started his IT career in 1995 at the CRP Gabriel Lippman as IT researcher. After 3 years he moved to the IT services sector, through different positions in MarchFirst and Cronos/Sword. In 2010 after having gathered a managerial experience of 10 years, Mr Apolinario joined Arηs to launch a new subsidiary in the Group, Arηs Cube. Mr Apolinario was born in 1974, has both Luxembourgish and Portuguese nationalities and is fluent in 5 languages.
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Sébastien Braun
Managing director ARΗS Consulting
Sebastien holds a Master SID (Systèmes d’Information Distribués) obtained at the University of Nancy in 2004. Immediately after his studies he joined Intech where he worked as junior developer then developer for different customers such as Arcelor Mittal and the CTIE. In 2007 Sebastien joined Arηs Developments as BI Consultant on a major project for Proximus on which he became Delivery Manager. After 3 years he has been assigned Arηs Consulting in order to manage several projects involving the Luxemburgish public sector and the CTIE. In 2014 Sebastien became Operations Director for Arηs Spikeseed and Arηs Consulting for which he is now Managing Director. Sebastien was born in 1981 in Thionville (France).
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Steven Germeys
Managing director ARΗS Technology
Mr Germeys studied Company Management at the KHLeuven and obtained a Postgraduate degree in Business Economics at Vlekho Brussels. He has over 20 years experience in commercial and operational management having worked at several companies such as Dell, Sun Microsystems and Ordina. Before joining Arηs Mr Germeys worked as commercial director at Cegeka supervising all commercial activities. In 2015, he joined Arηs to launch a new subsidiary in the Group, Arηs Technology. Mr Germeys was born in 1971 and is of Belgian nationality.
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Georgios Karatzas
Managing director, ARΗS Developments Hellas
Mr Karatzas holds an Electrical Engineering and Computer Science Degree from the National Technical University of Athens and a MSc Degree in Computer Science from the University of Patras. He joined European Dynamics’ Business Development dpt in 2005 that he led from 2008 to 2010. In 2010, he joined UniSystems as Sales Manager and actively participated in its international growth. Mr Karatzas joined Arhs in 2018. He was born in 1976 and is of Greek nationality.
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Gunther Roobaert
Managing director ARΗS Digital
Gunther holds a Master Degree in Business and Technology from HUB-EHSAL and a Master of Management from the VUB in Brussels. In addition Gunther obtained an MBTI certification from Cranfield University (UK). He started his career in 1993 at Teradata (Part of NCR and AT&T) as an account manager. After 12 years going through several commercial positions, Gunther became Director for Teradata Belgium and Luxemburg. In 2012 Gunther joined Arηs to launch a new subsidiary in the Group, Arηs Digital. Gunther was born in 1967 and is fluent in 4 languages.
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Arnaud Koster
Managing Director ARHS SPIKESEED
Arnaud Koster holds a Master’s degree in Computer Science from the University of Liège and completed the Management Immersion Program at HEC-University of Liège. He joined ARHS in 2012 as a software engineer before transitioning into technical leadership roles across various projects. Throughout his career, Arnaud has worked on a wide range of projects, spanning early-stage startups, major financial institutions, and public sector organizations. He played a key role in expanding ARHS’s expertise, particularly in Cloud and Data & AI, which he led for several years. In 2019, Arnaud was appointed Technical Director of Arηs Spikeseed, an entity of Arηs Developments dedicated to innovation. In this role, he oversaw multiple strategic competencies and drove the creation of several competence centers in fields such as AI, data engineering, and public cloud. Since 2024, Arnaud has been leading Arηs Spikeseed, shaping its strategic vision, fostering innovation, and ensuring the successful delivery of high-impact solutions across industries. He holds Belgian and Luxembourgish nationalities.
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