Colorist at Large! Don't have a system built for color grading and have a project where it is best that I work at your location or are you working on a project out of town keep me in mind.
Advances in laptop abilities makes this possible. Inside my Pelican case is a killer laptop, 27" color calibrated monitor, and 6TB of raid storage running full DaVinci Resolve, Adobe Premiere Pro and Avid Symphony. 4k footage is not a problem.