The Melbourne-born tech company that jointly holds the record for the largest venture capital raise completed by an Australian business, Cyara, has acquired an Irish communications testing company, in a deal understood to be worth upwards of $US100 million ($150 million).

The deal, the terms of which were undisclosed, comes after the local customer experience assurance company raised $US350 million in February last year from US-based growth capital firm K1 Investment Management, securing its spot in local start-up legend.