Layec refereed his first match in Ligue 1 in 1998 and, in 2002, became a FIFA official.
He refereed his last match on the final day of the 2009–10 season and now serves as the president of the Direction Nationale de L'Arbitrage (English: National Leadership of Arbitration) (DNA).
Layec is currently under investigation by the French justice system for defamation of character after distributing an abusive e-mail directed at Bruno Derrien, a former referee who authored a controversial book directed at his profession.At international level, Layec officiated at the 2007 FIFA U-17 World Cup, as well as Euro 2008 qualifiers and 2010 World Cup qualifiers.