Despite entering the 2010 European Athletics Championships as a rank outsider for the title, Darien won the silver medal with a personal best time of 13.34 seconds. He repeated this success at the 2011 European Athletics Indoor Championships on March 4, winning silver in the 60 m hurdles in another best of 7.56 seconds. He was the silver medallist at the 2011 European Team Championships, but missed much of the later outdoor season due to injury. He returned to action in June 2012 and promptly set a hurdles best of 13.24 seconds to win in Geneva, then matched that time at the Memorial Primo Nebiolo.