Corrinne Yu, a principle engine programmer at Microsoft's 343 Industries, has left the studio to join The Last of Us developer Naughty Dog.
A deleted tweet is said to have read: "I am loving PS4 graphics coding. No more Windows 8 for me. So happy!"
Yu earlier worked as lead technology programmer at 3D Realms and was a director of technology at Gearbox.
During her time at 343, Yu created new lighting tech for Halo 4, a system which Microsoft has now patented.
It's assumed that Yu is now working on the first PS4 outing for the Uncharted franchise.