Management team

Tsvetan Alexiev – CEO& Board of Directors Chairman

Tsvetan Alexiev is Chief Executive Officer of Sirma Group Holding, CEO and Chairman of the Board of Sirma Solutions, Chairman of the Board of Sirma Business Consulting, and a member of the Board of Directors of Ontotext, Daticum, and Panaton Software.

Tsvetan joined Sirma as a software engineer in 1993. Throughout the years, he held various positions within the company – team lead, project manager, group manager, head of division. He has a leading position in the establishment of Sirma Solutions, Sirma Media, Sirma Business Consulting, Daticum and the acquisition of SES.

Tsvetan initiated the restructuring of Sirma into a holding organization and the prepositioning from pure software service-oriented company into a product oriented holding company. The holding corporation manages investments in various businesses within the group, incubates and creates new businesses, attracts investments and acquires new companies.

Tsvetan is responsible for the overall management of the whole holding structure and BD operations of Sirma Solutions. Tsvetan earned his Master’s Degree in Computer Science at the Technical University in Sofia.

Chavdar Dimitrov – Executive Director & COO

Chavdar Dimitrov is a Chief Executive Officer of Sirma Solutions, a member of the Board of Directors of Daticum and a member of the Management Board of Sirma Group Holding.

Chavdar has been part of Sirma since its establishment in 1992. He held various positions within the company – software developer, team lead, project manager. In 2005, Chavdar becomes an Administrative Director, and later on he occupies the position of Human Resource Director. Since 2009, Chavdar has been operating as a Chief Executive Officer of Sirma Solutions.

Chavdar is responsible for the overall operations of Sirma Solutions. He earned his Master’s Degree in Computer Science at the Faculty of Mathematics and Informatics at Sofia University

Atanas Kiryakov – Member of the Board, CEO of Ontotext

Atanas Kiryakov is the founder and Chief Executive Officer of Ontotext – a leading provider of semantic databases and content analytics in media, publishing, pharma, government and cultural heritage.

Atanas joined Sirma as a software engineer in 1993 and later on he became a partner and a member of the Management Board. In 2000, he founded Ontotext and engaged the company in research projects with a total budget of over 100M Euro. In 2008, Atanas finalized an investment deal for Ontotext for 2.5M Euro with the venture capital fund NEVEQ.

Atanas is a leading expert in semantic databases and an author of multiple publications and book chapters, including “Semantic Search” in “Information Retrieval – Searching in the 21st Century” and “Storing the Semantic Web: Repositories” in the “Handbook of Semantic Web Technologies”.

Atanas earned his Master’s Degree in Computer Science at Sofia University.

Rosen Marinov – CEO& Head of Hardware Department

Rosen Marinov is a CEO and member of the Board of Directors of Sirma Solutions JSC, and CEO of  Daticum JSC.

Rosen started his career as a software engineer in 1999, at Sirma Solutions, and went through a number of positions within the company.

He took over the position of Head of System Integration at Sirma Solutions in 2005 and managed hardware division. Since 2008, headed Daticum, a subsidiary company of Sirma Solutions, which provides cloud‐ based infrastructures and services, and virtualization solutions.

His portfolio comprises a large number of system integration projects in financial sector, mainly for  payment systems and banking institutions. Rosen Marinov has overseen the building of multiple data centers and was involved over 30 large-scale projects for private cloud infrastructures. He designed and invested in the largest public cloud project in Bulgaria, aiming to provide cloud services to corporate clients.

Rosen is appointed as a CEO of Sirma Solutions in 2016, in charge of  European business services and system integration. Rosen earned his MSc in Informatics at the Faculty of Mathematics and Informatics, at Sofia University.

Asen Nelchinov – Sales Director

Asen Nelchinov is a Sales Director & Projects Supervisor of Sirma Solutions JSC, Technical Director of Sirma ICS Ltd., Member of the Supervisory Board of Sirma Group Holding JSC, Chairman of the Board of Sirma Media JSC, and member of the Board of Directors of Sirma Solutions JSC and Daticum JSC.

Asen joined Sirma as a software engineer in 1998. He held various positions within the company – senior developer, team lead, project manager, projects supervisor, head of department, etc. Since 2009, he has taken over Sales Department of Sirma Solutions, and three years later became also a technical director of Sirma ISG/Sirma ICS. He is in charge of post-sales activities, PM and also oversees e-Gov projects. He has led more than 50 successful projects in e-government, e-business, education, finances, etc. and widen significantly the company’s business in Bulgaria.

Prior to 1998, Asen worked as a freelancer for various R&D projects, a teaching assistant in the Faculty of Mathematics and Informatics at the Sofia University, and a PhD candidate in the Institute of Information Technologies of the Bulgarian Academy of Sciences.

Asen earned his Master’s Degree in Computer Science at the Faculty of Mathematics and Informatics, at the Sofia University.

Momchill Zarev – Head of Mobile Technologies

Momchill Zarev is the founder and Chief Executive Officer of Sirma Mobile – a software company specialized in mobile applications and internet technologies, including business applications, services and platforms in many verticals.

Momchill joined Sirma as a software engineer in Sirma AI/Ontotext in 1999, and initially was involved in the implementation and management of e-commerce and VoIP projects.  Later he held various positions within Sirma Solutions – team lead, project manager, etc. His experience covers all aspects of development of complex software systems, mobile applications and new products and services in the field of mobile technologies, workforce management, and mobile parental control services, LBS, augmented reality.

He has significant practise in Business Analysis, Business Modelling, Object-oriented analysis, OOA with UML, formal analysis, design and development of user test cases, as well as security of web applications, technical design with CASE instruments.

Owing to his remarkable technology talents, in 2008, Momchill was appointed as a Head of Sirma Mobile. Since 2009 he has been a Member of Supervisory Board of Sirma Group Holding, and in 2012 become a member of the Management Board of Sirma Solutions.

Momchill earned his MSc in Mathematics and Informatics Computer Science at the Faculty of Mathematics and Informatics, at the Sofia University.