Fujitsu workers in Belfast belonging to the union Unite are to take further industrial action.
They are in a dispute with their employers, the Japanese electronics giant, about job cuts, a pay freeze and changes to their pensions, reports hthe BBC.
The company employs about 400 staff in Belfast, 70 of whom are at risk of compulsory redundancy, according to the union.
The staff staged a three-day strike earlier this month, and union members leafleted shoppers in Belfast outside the premises of companies that outsource their IT services to Fujitsu, including Marks & Spencer.
Fujitsu staff in Wakefield have already protested against the same conditions.