Workvivo, which provides software for internal communications, has secured investment from tech entrepreneur Eric S Yuan.
The US billionaire is the founder and CEO of Zoom Video Communications.
It is believed he will invest €500,000 in Cork-based Workvivo.
Mr Yuan said the Irish firm's culture, values and technology were "a perfect fit" for his vision of employee communication, engagement and satisfaction.
Founded two years ago, Workvivo is being used to engage employees across 40 countries and in companies of all sizes. It will use the investment to grow users of its software to more than one million by 2021.
Co-founder of Workvivo John Goulding said: "Eric's investment is a hugely significant moment in the Workvivo story. In every one of our customers, we see increases in engagement and retention, because those employees feel part of a community and experience that every day."