As someone who is probably much closer to the bank employees (assuming you mean developers from banks) but has considered transitioning to something like c at v

As someone who is probably much closer to the bank employees (assuming you mean developers from banks) but has considered transitioning to something like c at various times, the problem is there are no intermediate roles, everyone either want a c expert with years of commercial experience. To make the transition the only option seems to be to go for junior roles, which disregards the decades of experience that is relevant regardless of the language, and those junior roles are pretty few and far between too. The industry expects a constant supply of senior experienced devs but completely avoids any sort of training and development. It can somewhat work if you're in a mainstream field but it won't for anything specialized, which C is in my area.