IMPACT union general secretary Shay Cody said today that 15,000 jobs have been lost in the public sector so far this year.
He was speaking at a conference in Dublin on how the Croke Park Agreement will impact public servants.
Mr Cody said that management has to put forward substantial and meaningful proposals on the implementation of the deal.
He went on to claim that some public servants face more barriers than workers in other sectors.
"There are also internal barriers that need to be removed," said Mr Cody.
"Why can’t a civil service engineer become a civil service manager at principal officer level, or at assistant principal level?"