Thrive has secured £2.75 million funding.
The Belfast software firm is targeting one million users of its employee communications software and support platform.
At present 250,000 use the platform, including councils, healthcare companies, manufacturing businesses, food firms and retailers. Media giant HBO is among its clients.
The new funding comes from Halo Business Angel Network (HBAN), Co-Fund II and private investors.
The company will create 10 new jobs in marketing, software development and customer care.