Hi,
I'm not familiar with those particular software or with fintech, but since you asked about the software development field, I think I can give a partial answer.
Learning a software language like Java is important because it teaches you the important ideas used to code. Different languages may have different benefits and may be needed instead of Java depending on the final software you need to write. Additionally, if you have to write a piece of software for a company, you will have to write it using a software language and not a piece of software.
Regards,
Billy