Fujitsu staff look set to strike for three days from Thursday.
Workers at the Japanese IT giant are angered over job cuts, a pay freeze and pension changes.
Last year, the IT services unit said it would cut up to 1,200 jobs in the UK.
One hundred and fifty staff in Northern Ireland will be on strike, according to the BBC.
Employees at the north of England’s headquarters in Risley, near Warrington, and at sites in Manchester and Crewe have also walked out.
A Unite union spokesman said that, weather permitting, staff would also form picket lines outside the company’s buildings.
Further strike action will be staged on the 14 and 15 January.