This basically just describes the offices of most small- to large-sized tech companies that aren't part of West-coast tech culture (some of which has spread beyond the West coast, but does not dominate like it does there).
There are lots of them and they may well represent a larger proportion of dev employment in the US than either stodgy-old-established-bigtech (IBM, telcos) or ones that are a part of the aforementioned West-coast tech culture. They tend to develop industry-specific products (or, often, a whole bunch of industry-specific products) but are definitely tech—and often even purely-software—companies.
There are lots of them and they may well represent a larger proportion of dev employment in the US than either stodgy-old-established-bigtech (IBM, telcos) or ones that are a part of the aforementioned West-coast tech culture. They tend to develop industry-specific products (or, often, a whole bunch of industry-specific products) but are definitely tech—and often even purely-software—companies.