Zachry Engineering Corp. burst out of the recession with a full head of steam. On the heels of a tough couple of years, the design arm of Zachry Holdings is back among the region’s powerhouse firms. After its regional revenue dropped from $124.5 million in 2009 to $41.4 million in 2011, the company more than doubled the total in 2012, reaching $90.4 million. That secured it eighth place on the current list of top design firms in Texas and Louisiana.