"It was very difficult and still is to find experienced payroll experts in Wellington for love or money. It's a major project, quite a significant piece of work."
The shortage had been apparent for the past four months, he said.
Other recruiting agencies including Robert Walters, Adecco and Frog Recruitment also had job listings for payroll professionals.
A senior payroll clerk can earn between $55,000 and $65,000 and often made the transition from payroll to human resources, Mr Walker said.
The other in-demand workers were tradesmen, according to Hays' latest quarterly report.
Shortages in the trades and labour market were a result of continuing work on the Christchurch rebuild, Mr Walker said.
"As the Christchurch residential repair and rebuild programme gathers pace the demand for carpenters, painters, plasterers, tilers and scaffolders is increasing.
"The number of staff required on site at any one time has been impacted due to the majority of the work being smaller projects spread across multiple sites.
"This will continue to be an area of high demand as new build and commercial work commences."
Hays has up to 900 permanent jobs advertised at any one time and filled 700 temporary jobs in the past month.
Mr Walker said the company was back to record levels of recruitment not seen since before the global financial crisis, and he said the upturn showed a demand for highly skilled specialists as well as semi-skilled workers.
He expected the upturn would translate into increased salaries in the next 12 months.