IST constitutes one of the most respected Independent Software Vendors in the Greek market.

Being in the forefront of the Greek ICT market since 1991, IST has established itself as a technology and client-driven company, bringing tangible value to its client-base through a sophisticated portfolio of software services and products.

Think Big, Act Small


International Software Techniques S.A. (doing business as IST) is a private company of Greek interests, established in 1991.

IST currently functions both as an Independent Software Vendor (ISV) and as a Value-Added Reseller (VAR) for third-party software products and services, constituting what has been lately coined as "boutique software development company".

The company is headquartered in Marousi, Athens, Greece. The management team owns 100% of the share capital, allowing the company to pursue a coherent growth strategy.

IST dedicates itself to delivering highly sophisticated services to a number of high growth and demanding industries, such as telecommunications, banking and pharma. The company is primarily addressing the needs of large-sized and Enterprise-level organizations (either private, publicly-traded or multinational).

The company is also actively pursuing grants through Greek and European funded research projects.

At IST, we are a strong advocate of the "Think Big, Act Small" management approach: think big, authentic ideas about solving customers’ problems, making better products, and creating value. But, at the same time never stop acting like a start-up; staying humble, treating every employee like the owner, and having everyone in the frontline.

We make a conscious and continuous effort to combine the strengths of a big organization with the hunger of a start-up. We build excellent relationships with our customers, suppliers, and employees. We groom future leaders at all levels, and we balance their short-term goals with their long-term visions.

Key Facts


  • Country of incorporation: Greece

  • Year of establishment: 1991 (as Ltd. / Limited Liability Company)

  • Legal form change: 2005 (transformed into Societe Anonyme)

  • Current structure of entity: S.A. – equivalent to Corp. (USA) / plc (UK) / AG (Germany)

  • Type of entity: Privately held - shareholders management team owns 100% of share capital

  • Certified Public Accountants / Auditors: SOL S.A. (full member of the Crowe Horwath International network)

  • Doing Business As (DBA): IST

  • Legal Name (English): IST - International Software Techniques S.A.

  • Legal name (Greek): IST - Διεθνείς Τεχνικές Εφαρμογών Α.Ε. (IST - Diethneis Technikes Efarmogwn A.E.)

  • VAT number: EL095526161

  • Local tax authority: FAE Athinon

  • GEMI (General Electronic Commercial Registry) number: 6264401000

  • D-U-N-S number: 499928021

  • Certifications: ISO 9001:2008 / ISO 14001:2004 / ISO 27001:2013 / ISO 22301:2012 / ISO 20000:2011 (Lloyd's Register Quality Assurance)

  • Company Registered Office & HQ: Flias 1, 151 24 Marousi, Athens, Greece

Management Team


  • Company Founder: Mr. Antonios Roussos

  • Mr. Georgios Roussos (President of the BoD / General Manager)

  • Mr. Thanos Printzos (Chief Executive Officer)

  • Mr. Georgios Livaditis (Chief Financial Officer)

  • Mr. Panayiotis Tzagkarakis (Chief Technical Officer)

  • Mr. Antonios Apostolakis (Chief Knowledge Officer)

  • Mr. Konstantinos Madias (Management Systems Manager / Marketing Manager)

Portfolio of Services


We offer our clients a diverse portfolio of sophisticated IT-related products and services, tailored to their specific needs:


  • Custom (Bespoke) Software Development (for high growth vertical markets)

  • Proprietary Software (for Telecommunications Operators / Telcos)

  • Outsourcing Services

  • Staff Augmentation

  • Value Added Services (acting as a Value Added Reseller for third-party software solutions)