Four hundred new jobs are to be created in Dublin by US cloud-based finance and human resources software developer, Workday.
Recruitment for the roles, which span a range of areas, is to begin right away.
Workday first came to Ireland in 2008 when it bought Irish technology firm, Cape Clear.
Today, it employs 1,300 people, including 800 engineers, at its European headquarters in Smithfield in Dublin, which it opened in 2015.
Now it plans to grow that headcount by a further 30%, adding 400 new jobs to support regional growth and further innovation.
The new positions will mostly be in product and technology development, as well as sales, customer operations, and other functions.
"Since setting up operations in Ireland in 2008, we've attracted some of the industry's best talent to help develop our innovative products," said Chano Fernandez, co-CEO of Workday.
"Our Irish team has helped to shape our technology and ultimately supported the success of our customers around the world.
"With this added support, we'll be able to continue this great progress by expanding our efforts in the region and fostering a great culture in our Dublin office."
The investment is supported by the Government through IDA Ireland and has been welcomed by Taoiseach Micheál Martin, Tánaiste and Minister for Enterprise, Trade and Employment, Leo Varadkar and Minister for Finance, Paschal Donohoe.
"The creation of these 400 additional jobs underlines the company's commitment to Ireland and is a real boost at time when so many people are out of work," Mr Varadkar said.
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Workday has more than 12,000 employees around the world and its products are used by over 40 million people.
"This announcement further enhances Ireland's reputation as a premier location for companies in the cloud computing industry, due to the availability of highly skilled ICT graduates and professionals here," said Martin Shanahan, chief executive of the IDA.