The thesis presents the needs of a specific Slovenian company for IT solutions and development of a web application or web store which meets those needs and eases the communication between customers and the company. The technologies used and the procedure of creating a web application are described in detail. The first part of the thesis presents the company itself, particularly the existing IT system to which the web application will be connecting. ERP systems are also presented in detail. The next part presents the purpose and the requirements which the web application should meet. The B2B (Business to Business) marketing strategy of the company is also presented. The main part of the thesis defines the developmental technologies use...