SpaceX ( Falcon9 and Dragon ) Swipe --> Follow: @programmer-jokes For More Amazing Information They primarily code in LabVIEW. they develop the GUIs used in Mission and Launch control, for engineers and operators to monitor vehicle ( With help Of Python ) Test Measurement , control SpaceX mostly Hire Game Developer because they well understand c++ Programming and Create and Deployed any Function of code in any Environment ( Mostly they not Develop any New Software for Time and Money Saving ) SpaceX uses an Actor-Judge system to provide triple redundancy to its rockets and spacecraft. what is redundancy? if one system was failed, there's another system to back it up if the second system fails there's a third system to back it up after auto synchronize all data from non-working side to working side Source: Discussion with various SpaceX engineers at GDC