Aussie-founded tech giant Atlassian’s second-quarter revenue has surged to cap a ‘ripper’ billion-dollar 2018, with its share price in the US rising nearly 10 per cent.

The NASDAQ-listed collaboration software maker posted a quarterly revenue rise of 39 per cent, year-on-year, to $US299 million ($A415.5 million), eclipsing market expectations of $US288.3 million, and cementing the rich list status of Australian co-founders Mike Cannon Brookes and Scott Farquhar.

Mr Farquhar said the result capped off a huge 2018 that saw the company surpass $US1 billion in revenue for the first time.

‘Australians often to refer to ‘something excellent’ as being a ‘ripper.’ And we had a ‘ripper’ of a quarter,’ Cannon-Brookes and Farquhar said in a letter to shareholders.

The update comes a day after Mr Farquhar and Cannon-Brookes came in at equal fifth on Forbes’ Australia Rich List for 2019, each with a fortune of $US6.4 billion – which is now set to be higher.

The pair founded Atlassian in Sydney in 2002 and launched the company on the NASDAQ in 2015.

It is believed to be worth $US22.09 billion.

In Friday’s update, Atlassian said its flagship product, Jira Software, surpassed 65,000 customers during the second quarter, and the company ended the quarter with more than 138,000 total customers – a lift of more than 5000.

Meanwhile, total third-quarter revenue is expected to be in the range of $US303 million to $US305 million, while full-year revenue is expected to be in the range of $US1.195 billion to $1.199 billion.