Jan Horcik together with his teammate Filip Matejicek made several type projects within their foundry Heavyweight, the full typeface catalogue is possible to see on the Foundry site where you can see the typefaces from them both. They are also providing custom typefaces as well as letterings and logotypes.
During the time at his time at Hort studio in Berlin he took part of a few design competitions with the studio, one was for instance the design proposal for the Ministry of Sound & Dolby Atmos or the competition for the new visual identity of MoMA he made together with Filip Matejicek, Martin Groch and Tim+Tim. Tim+Tim invited him for a few collaborations on the letterings for Nike as well.
During his time at Laurenz Brunner's studio in Berlin he was working on a custom typeface for Sydney Opera House, on LL Bradford typeface released on Lineto and on the Owl symbol for Documenta Athens.