Canadian technology company SOTI is to create 150 jobs in Galway.
The company makes software for managing mobile and "internet of things" devices.
Initially the firm will invest over €20m and create 50 jobs, with a further 100 to be provided over the next three years.
The company has 17,000 business customers and ten offices around the world, and will employ over 1,000 staff by the end of the year.
SOTI said it will use the office here to strengthen its presence in Europe as it targets new markets like retail, healthcare and field services.
"Ireland forms an integral part of our long-term growth strategy, as it has developed an excellent reputation for being a technology-based economy, home to a vast array of tech companies - from giant multinationals, to new start-ups," said SOTI President and CEO Carl Rodrigues in a statement.
He added that Galway had been chosen as it is already home to many Fortune 500 companies, making it easier to source experienced development and sales talent.
IDA Executive Director Mary Buckley, whose organisation has supported the investment, said it would be a mutually beneficial relationship where Ireland will benefit from technological innovation and job creation, while SOTI will have the freedom to operate in a connected, pro-business environment.
The announcement has been welcomed by Minister of State at the Department of Communications, Climate Action and Environment Sean Kyne, who said it would be a boost for Galway.