Workplace wellbeing platform Sonder will target international growth following the completion of a $40 million investment from Blackbird Ventures, Seek and industry superannuation fund Hostplus.

The Sydney-based company claims to be growing at 40 per cent a year and to have hit a milestone of signing up a million members to its mobile app. The app lets companies provide employee wellbeing services and support in areas such as personal safety, medical and mental health.