Fujitsu staff plan to strike this Friday in a row over job cuts, a pay freeze and pension changes.
Workers at the computer giant’s Wakefield offices will down tools for the first six days of action.
According to union leaders, a substantial number of the 250 skilled workers based at the Wakefield House offices will take action.
Unite claims the walkouts on 18 December and 7, 8, 11, 14 and 15 January will be the first national strike in the IT sector in the UK, the Yorkshire Evening Post reports.
Unite said it planned to stage a protest outside the company’s London headquarters on 18 December.
It is claimed Fujitsu wants to axe 1,200 jobs from it’s total workforce of around 11,500.
The union is demanding a no compulsory redundancies pledge from Fujitsu and a pay freeze lifted.
Unite also said Fujitsu plans to close final salary pension schemes, affecting 4,000 employees.
Unite national officer Peter Skyte said: “This is not a failing or ailing company. It made £200m profit last year. This is a company that can afford to provide better pay and decent pensions.”
He added: “Our members are saying enough is enough. They want to be treated fairly.”
A Fujitsu spokesman said: “Fujitsu is disappointed that Unite has decided to announce industrial action while consultation continues with the elected employee representatives on the proposed changes to the pension scheme.
“If the industrial action goes ahead, Fujitsu will take measures to ensure that service to its customers is maintained.”