Three hundred new jobs are to be created at Seagate Technologies in County Londonderry, Northern Ireland Secretary Peter Hain has announced.
Seagate is to invest £83m in its plants in the north west
The jobs are part of an £83m investment in the company's plants in Springtown and Limavady. Almost one third of the money is coming from Invest NI.
Other investments in the area also announced include a £250m upgrade to the A6 road between Derry and Dungiven.
A further £10m will be spent upgrading and promoting Derry's city walls.
Mr Hain also said £8m would be spent on Waterloo Place and Guildhall Square in the city.
"The package of measures I am announcing signals the government's intention to work collaboratively with the leadership in this city and the north west region as a whole in the years ahead," he said.
Millions are to be spent promoting Derry's walls as an attraction
Mr Hain added that Seagate's decision to invest in the region was a testament to the skills and abilities of the local workforce.
"The investment will create significant new quality employment opportunities in advanced manufacturing in the north west," he said.
The company manufactures computer hard drives at the two factories in the north west for a global market.