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Swift attended DigiPen Institute of Technology. As part of her senior game project, she took part in the making of the video game Narbacular Drop, as part of the team Nuclear Monkey Software. Following Narbacular Drop’s release, most of Nuclear Monkey Software was hired by Valve to adapt Narbacular Drop’s core mechanics (i.e. its portal technology) to the Source engine, eventually leading to the creation of Portal, for which she worked as project lead and level designer.
Following the release of Portal, she received the "Innovation", "Game of the Year" (both with Erik Wolpaw) and "Game Design" (with Realm Lovejoy and Paul Graham) awards at the 2008 Game Developers Choice Awards.
 Work for Portal
 Selected gameography
- Narbacular Drop (2005)
- Half-Life 2: Episode One (2006)
- Portal (2007)
- Half-Life 2: Episode Two (2007)
- Narbacular Drop - Interview
- The Portal Interview
- Video - Our Journey From Narbacular Drop To Portal
- Video - Kim Swift Left 4 Dead 2 TGS 2009 Interview