He published his first video on YouTube at the age of twelve. Although it was not a great success, his friends and other players gradually joined him, and after some success with GTA, Jan started posting Minecraft videos. Currently, he also makes various funny reactions to memes from Reddit or to TikTok videos. His second channel is called MENTSGARAGE which mainly focuses on automotive content and roads trips abroad, his third and newest channel is called MenT3.
In 2019, together with Tomáš Šedivý (MrTomcatCZ), he recorded a song called 128, which became the basis of many memes. Last year, Forbes magazine ranked him third in the list of the 10 best-paid YouTubers in the Czech Republic, this year Jan made it to the Forbes 30 under 30 list.