Upthere (www.upthere.com) was founded by Bertrand Serlet, who was the brains behind iOS and OS X.
They are looking for creative and talented engineers and product designers with experience in technologies like C/C++, Objective-C, Node.js, and JavaScript; platforms like iOS, OS X, and Android; knowledge areas like storage, database, security, and user experience; or System Reliability and Quality Assurance.
Very exciting company and they are looking for generalists who can contribute to multiple areas of their custom stack.