The reason for the growth over different time frames can differ. Anecdotal, but most of the IT people I know from Poland worked for, as they call it, "big corpo" and generally it's offshoring either directly with companies such as DXC/Luxoft or n-ix, or through local offices (Akamai for example). If you look at the average salary in Poland (in general), and the average tech salary + the number of tech workers there, it's easy to say a large part of the GDP is tech.
Whether or not it's offshoring is a little less obvious, but I can't think of more than 2 or 3 successful Polish tech companies.
