From their Reddit AMA [1] "The rocket is all C++ The rocket and spacecraft are all C++. On the ground, we use National Instruments LabVIEW extensively." - spa

From their Reddit AMA [1] "The rocket is all C++ The rocket and spacecraft are all C++. On the ground, we use National Instruments LabVIEW extensively." - spacexdevtty [2] [1]http://www.reddit.com/r/IAmA/comments/1853ap/we_are_spacex_software_engineers_we_launch/ http://www.reddit.com/r/IAmA/comments/1853ap/we_are_spacex_s... [2]http://www.reddit.com/r/IAmA/comments/1853ap/we_are_spacex_software_engineers_we_launch/c8bpr00 http://www.reddit.com/r/IAmA/comments/1853ap/we_are_spacex_s...