National Keep - NK Bilişim Teknolojileri Ltd. Şti. As the information of all our customers who work with our company is confidential, we cannot share the details of our work on the web or verbally with you. All of our references can only be requested from our customers in writing and we can ensure that they reach you. However, as our company, we can underline that we work with over 200 public institutions and affiliated provincial organizations, universities, municipalities, law enforcement agencies and also private companies.