Lattner’s resignation comes within 6 months of joining the company.

In a troubling sign for electric luxury carmaker Tesla Inc, Chris Lattner, the head of its autopilot software, has left the company within six months of joining it.

“Chris just wasn’t the right fit for Tesla, and we’ve decided to make a change,” said a spokeswoman for Tesla.

“Turns out that Tesla isn’t a good fit for me after all,” tweeted Lattner, an ex-Apple Inc employee who worked there for decades before joining Tesla in January.

“I’m interested to hear about interesting roles for a seasoned engineering leader!”

On its part, Tesla’s spokeswoman disclosed it had hired Andrej Karpathy as director of artificial intelligence and Tesla Vision team.

Karpathy, who most recently used to work as a research scientist at OpenAI, will directly report to Tesla’s CEO, Elon Musk.

Tesla’s spokeswoman added, Karpathy will work closely with Jim Keller, who has now the overall responsibility for the company’s autopilot software and hardware.