This master's thesis deals with electronic commerce, that is, the process of trading goods and services through the internet, from its beginnings to the modern trends. The meaning of the terms e-business and e-commerce as one of the segments of e-business is analyzed. An important emphasis is on the process of designing the e-commerce software solution itself. The first part defines the term of electronic business. Models and application areas of e-business and the difference between e-business and internet business are studied. In continuation, the considerations go towards the e-commerce as part of the e-business, which uses the internet for its activity. The e-commerce business models and the e-commerce development planning process are outlined. Mobile technologies are pervading all pores of society, and accordingly, we are witnessing the expansion of mobile commerce and mobile banking platforms. Accordingly, this e-commerce channel is also covered in this part of the paper. The second part of the paper analyzes the core infrastructure which is necessary for the realizing the online trading and the Front-End and Back-End components of the Web Store. The quality criteria, which are necessary for the efficient and profitable function of the system, as well as the stages of e-purchase process and goods delivery to the customer, are specified. The third part is dedicated to the transactions securities that accompany the online trading process. This is the most important point in the whole issue, especially from the customer's point of view. Therefore, the dynamics of electronic business development directly depends on the level of security and the security technology improvements, that is, on the level of users trust in such technologies. Accordingly, this part of the paper provides an overview of the cryptography techniques and transaction secure transmissions across the network, as well as the protocols used. In addition, the institutions and laws governing the online and offline information systems security are listed. Finally, the last part of this paper is focused on the practical implementation process of the e-commerce software solution. The platform, as well as the procedure and technologies used to create the software solution and the procedure for setting up and commissioning the application are presented.