Up to 474 new jobs are being created at Randox Laboratories in Co Donegal.
The company has announced it is expanding its facility in Dungloe over the next six years.
It specialises in developing tests for conditions like Alzheimers, kidney disease and some forms of cancer.
It already employs 66 people at the plant and plans to raise that number to 540 by 2020.
Dr Kieran Richardson, Research and Development Manager at Randox, told Highland Radio News that while some of the jobs will require specialised qualifications and experience, many others will be filled from within the local community.