O’Carroll will work with master blender Billy Leighton and be responsible for the development of new and existing blends as well as the management of stock.
O’Carroll joined Irish Distillers in 2012 as part of the first year of the Jameson Engineering Programme and after completing the two-year programme she was appointed process technologist.
Most recently O’Carroll served as bond supervisor looking over filling and emptying of Midleton’s 1.7m maturing casks.
“In a few short years, Deirdre has risen through the ranks, proving how competent and capable she is in the roles that she has held, most recently managing a team of 13 people,” said master blender Leighton.
“She is an invaluable member of the team in Midleton and I am delighted to announce her appointment as blender.”