"The aim is to grow the business further globally. The business is investing in new engineering, sales and marketing staff to fuel its growth," the company said in a statement.
The founders now want to set up an office in the United States and start hiring sales people.
Thematic specialises in analysis of "free text" responses to targeted questions, which are the hardest to analyse.
"Our technology helps businesses to understand what their customers are saying at scale.  It's one thing to collect an NPS [net promoter score], it's a whole different ball game to deeply understand the specific issues and themes driving that score," the statement said.
Thematic's technology enables clients to take into account written customer feedback --
the part of the survey that actually told companies what they were doing right and wrong.
Medelyan has a PHD in natural language processing and machine learning, while her husband and business partner, Holmberg, quit his job as chief architect for leading music software company Serato once the couple realised the technology's potential.