Paweł Bogdan is a programmer from Krakow, born on the Polish-Lithuanian border. In his more than ten-year career, he took on many different tasks. He programmed in Python, wrote a PhD in mathematics, and lectured at Jagiellonian University. He's been experimenting with Scala lately. But it was on Java that he cut his teeth. From the beginning of his studies, he was interested in cryptography, which was reflected in the subject of his master's thesis and the subject of his classes. Paweł is the author of video courses, leading webinars, and stationary training. In his free time, he takes photos, rides a bicycle, and reads books.