Noonan Services, an Irish-owned company which has its local headquarters in Lisburn, will bring its total Northern Ireland workforce to 1,012.
It comes after the firm secured new contracts and invested £500,000 in new equipment.
Group CEO John O'Donoghue said: "Our team has worked exceptionally hard to deliver a first-rate service for clients.
"This investment represents a vote of confidence in them and the Northern Ireland economy".
The company employs more than 7,000 people across Ireland. It said the new positions will be based at locations across Northern Ireland.
The new contracts include an international corporate law firm and a major government department, Noonan Services said.
A further 230 jobs will be secured as part of the move.