Ludvig is one of the best systems-level computer programmers of this era. His focus is on optimization in every way has been the secret to success for these projects; something that is sadly missing in most software these days. µTorrent came about when other torrent software was heavy so it took over the market. The Spotify Desktop client came when instant streaming music online was a lot more difficult than it is now, and the case for ScummVM is obvious. He was one of those assembly and C win32 programmers who wrote code as close to the OS as possible, even when .NET and Java and even MFC had major marketing pushes.
I was on a puzzle team with him and he was our secret weapon, programming brute force "scripts" to find the solution before anyone could solve it logically, winning us the competition handily. And I also remember (wrongly) discouraging him from making µTorrent because I felt it was already a saturated field. Luckily he did not pay attention to my suggestion.