KFZ Group company Sisasoft started its operations in Ankara in 2019 in order to provide quality solutions for all solutions of its business partners in the field of Information Technologies. Since 2024, the company has stepped into the field of defense with the representation of those coming from the Defense Industry and continues its activities as Büyük Savunma ve Yazılım Teknolojileri A.Ş. Büyük Savunma ve Yazılım Teknolojileri A.Ş. In order to ensure the participation of national technology, it develops products in the fields of aviation, defense and corporate software together with its solution partners.

Büyük Savunma ve Yazılım aims to use Safety Critical software in the areas of use together with its solution partners. Software development activities in accordance with standards such as DO-178C, DO-278A are the company's main field of activity.

Büyük Savunma ve Yazılım has superior features in operating the options of standards, documentation, development of embedded software, testing and protection of all other certification targets. It offers hardenable development and consultancy services.

In addition, Büyük Savunma ve Yazılım can offer Artificial Intelligence options in different places by carrying the experience it offers with Artificial Intelligence products developed in the civilian field to the field of defense.