Robert Williams is now Amazon's App Store director but he ironically still used a Windows Phone to check in at his new employers' headquarters in Seattle.
It was just a couple of months ago that Brandon Watson, former head of Windows Phone Developer Experience at Microsoft, also joined Amazon. He became director of the Kindle Cross Platform team.
Amazon's latest poach reinforces rumours by both the Wall Street Journal and Bloomberg that the online retail giant is planning to launch a smartphone (or possibly a five-inch "phablet") this fall. The company already has a relatively popular, seven-inch Android tablet for sale in the US called the Kindle Fire.