A senior NSW Treasury official became the chief financial officer of the land titles registry in a "classic" case of the revolving door, renewing calls for the government to restrict such moves.

James Dolton, the Treasury's head of commercial transactions, clinched the top financial job at Land and Property Information (LPI) in 2016, shortly before the bidding war began and six months before the $2.6 billion deal was sealed.

NSW Premier Gladys Berejiklian and Treasurer Dominic Perrottet announce the $2.6 billion LPI privatisation deal in April 2017. Credit:Jessica Hromas

Previously, Mr Dolton spearheaded the privatisations of Transgrid's "poles and wires" and Pillar Administration, a superannuation administration provider. As early as 2013, he conducted a scoping study into the sale of LPI.

"This smacks of a classic example of revolving doors, the movement of personnel between government and industry which has the potential for undue influence and decisions that may not be in the public interest," Serena Lillywhite, CEO of Transparency International Australia, said.