The senior iOS dev I was working with in my first job after uni - he showed me so many objc tricks and his self-written libraries to make working with UI stuff in swift more concise, it blew my mind. At the same time, he was very humble and calm, and had a funny humor at times. Also his code and the architecture in an older app we needed to work on was super easy to read and understand. That's why I want to be more like him - and eventually grow a beard :-)