The Amsterdam-based company saw revenue double in 2016 and expects similar results in 2017. The company said it generated more than $1.4 million in revenue per employee and has been profitable since 2011.
The company is backed by wealthy tech investors including Facebook's Mark Zuckerberg and Singapore sovereign wealth fund Temasek. It was last valued at $2.3 billion in 2015. The company says it has been profitable since 2011 but does not disclose exact figures.