I created from scratch part of a front-end ETL (Extract Transform Load) application to process data. The data is presented in graphs created using D3.js. The graph-based main part of the application uses Canvas/Konva technology. Also, I made another application from scratch of the ETL (Extract Transform Load) type for data processing for a client in the telecommunications industry. The priority part of the application is based on graphs in SVG technology. At the beginning of my career, I created an application to create alarms for telecommunications networks. I am constantly expanding my knowledge and looking for non-standard solutions.