Carmack is just insanely productive. He had a working prototype of the GearVR Netflix app <i>three days</i> after he started working with Netflix to develop it, and pretty much finished the app a week later.<p>Have a read about how he developed the app:<p><a href="http:&#x2F;&#x2F;techblog.netflix.com&#x2F;2015&#x2F;09&#x2F;john-carmack-on-developing-netflix-app.html" rel="nofollow">http:&#x2F;&#x2F;techblog.netflix.com&#x2F;2015&#x2F;09&#x2F;john-carmack-on-developi...</a><p>It&#x27;s almost beyond belief what he managed to accomplish in one and a half weeks. Hacking the Netflix video decoding system, fine-tuning the UX control heuristics, working around DRM limitations, 
optimizing the power draw and thermals, and much more, all on top of implementing the very polished app itself.