You can learn the basics of FPGA development on your own (I did), but you need to go to a company that uses them to actually get good.[0] Which probably means a defense contractor or maybe a telecom company. A finance firm isn't going to hire some random person who knows FPGA dev unless they have done real world projects.

[0]: I'm sure there are exceptions of people who self taught themselves and are great, but it is significantly harder to break into than software.