It really matters a lot more if an employee finds his or her own job interesting than if you find it interesting. I can personally attest that at least one employee finds his job in software development interesting, even though it involves little to no theoretical math. In fact, I find it a little disparaging that you call my career uninteresting so unequivocally.

However, if you yourself are so dedicated to pursuing mathematics (which does sound like an interesting topic) know that there are mathematicians in industry. Tech companies and government agencies hire huge numbers of math majors, and although the work can stray into the realms of applied mathematics, your interest in pure math could serve you well.