BitTitan, a Bellevue-based cloud and data services startup, is laying off 70 employees in January following its recent acquisition by Texas software company Idera. These cuts represent about 27% of its workforce, which stood at 257 employees at the time of the acquisition. The layoffs, disclosed through a state regulatory notice, are part of the post-acquisition restructuring. Founded in 2007, BitTitan operates in the competitive cloud services industry and had raised significant funding prior to the takeover by Idera, a larger software firm backed by private equity.