I've worked at a global investment bank in the past and have a somewhat different view. We had control over what language/tools to use per project (as much freedom as any startup) and it was definitely not subject to fed regulation. During my time there I was frequently contacted by recruiters from great tech firms such as google. Any company that knows how to recruit will look at what you've learned and what you've accomplished and not prejudice you simply for having worked at a financial firm.
If you feel you're not progressing as much skill-wise (which can happen at any job/industry), you can try to move to a different team within the company as many people do. The important thing is to keep learning so you can find things you are interested in.
If you feel you're not progressing as much skill-wise (which can happen at any job/industry), you can try to move to a different team within the company as many people do. The important thing is to keep learning so you can find things you are interested in.