Irish tech firm Intercom is to create 150 jobs here over the coming 12 months, which will bring its Dublin headcount to 400 by the end of next year.

Intercom provides communications systems to businesses for use in their online sales, marketing and customer support.

It was established in Dublin in 2011 and its software is now used by more than 25,000 companies, including Amazon, Facebook and Microsoft.

Intercom today has offices in San Francisco, Chicago, London and Sydney and expects its global workforce to pass 1,000 by the end of 2022.

"The heart and soul of our product innovation is in Ireland and we invest a massive amount of time and resources into the entire team," said Des Traynor, co-founder and chief strategy officer.

"Intercom offers unique, career-defining opportunities, and the ability to not only make a measurable impact from day one, but also positively impact the growing Irish tech scene."

Intercom achieved 'unicorn' status in 2018 - meaning it is a privately-held start-up that is valued at more than $1 billion.

It recently announced that it had hit $200m in annual recurring revenue.

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"We’ve seen strong, continued demand for our platform because the bar for delivering great customer experiences is higher than ever," said Intercom's CEO Karen Peacock.

"We’re looking for bold and ambitious team members who can help us continue to meet this demand, build the most innovative products, and deliver true value to our customers."

In September, Ms Peacock told the Irish Independent that the company was planning on making an initial public offer of its shares "sooner rather than later".