Elon Musk John Carmack Space X
John Carmack (left), Elon Musk and the Space X Falcon rocket.Getty Images / SpaceX

Billionaire SpaceX CEO Elon Musk has "offered" a job to Doom-creator John Carmack in a light-hearted exchange over Twitter. The pair messaged each other after Musk tweeted about the test launch of a rocket.

"Looks like Falcon landed fine, but excess lateral velocity caused it to tip over post landing," said Musk of the mission, which was the private space travel firm's sixth resupply trip to the International Space Station, but one which failed to land on an ocean platform in attempts to pioneer a reusable rocket system.

"Congratulations! How many engines are lit for landing? Can you differentially throttle for more degrees of control?" said an inquisitive Carmack in response, later responding to Musk's answer by saying he had "lost hours today to thoughts of rockets".

Elon Musk
The full exchange on Twitter.

"Well, if you love rockets, come work on them with me at SpaceX," said Musk in return, prompting excited responses from fans of the geek icons.

Carmack is currently busy acting as an important cog in the impending virtual reality (VR) revolution. In 2013 he left the company he co-founded, id Software, where he made his name working on the hugely successful and genre-defining Wolfenstein, Doom and Quake series, to join Oculus VR to work on their Oculus Rift headset.

Musk meanwhile, has his own dreams...