My guess would be 'very little', though I have no facts to back that up. It's just a staggering number given what the company does.
I've worked at a place like this. The job was as easy as it was cushy. Two week sprint plans could be completed in literally 3-4 days... but they just kept on hiring. I often heard the word "growth", but I have no idea as to why their interpretation of the word was desirable.
In contrast, I have also worked at two sucessful biotech companies. At the first we developed automated microscopy systems used by pathologists, as well as image viewing/analysis applications and your typical data management type interfaces. I worked on the scanner/image processing team. We were a team of six, three of which were software devs. The other software team (the data management / viewing stuff) had about eleven people. We were the most successful company in our domain, and our competition was the likes of Zeiss and Hamamatsu (one of which later purchased us.)
At my next company we successfully released a prognostic test for late stage colon cancer using CTC's found in the blood stream. In the course of doing so we had to write all sorts of integrations on top of an image viewing application, reporting systems, and the core bits (scanning + image analysis + local data management + R&D tooling.) We had a team of ~4 devs over a three year period.
When I read about stuff like this I'm just mystified.