I worked with Marc on different SensioLabs projects, including SensioLabsConnect, our developer social network. It was a pleasure to work with him as he knows how to find simple ways to solve complex problems.
If you are looking for a very good developer, he is definitely someone you should consider hiring.
Marc is a very skilled software engineer with broad knowledge in web technologies and the unix environment. He brought the devops spirit into my team and helped us tremendously to automate everything around our develop and staging setups. He was also instrumental in a second project where he built the whole backend for our new log analysis pipeline which is now used for many critical business decisions.
I really appreciated working with Marc as he is not only a bright developer but also a great team player. If you are presented with the opportunity to work with him - grab it!