What are the possible career paths for an interface developer?

This depends a great deal on your personality and what you want to do.
As a UX developer, you get deeply involved in how users will use the application — which lends itself well to a Product Management role. Product Managers set direction for the product and sequence which features will be done when. They need to have a deep feeling for how the user gets value from the application.
Of course, Interface Developer is one of the key roles for a startup as well, if you have interests in that area. It’s very difficult to get investment in a startup without a working ‘beta’ or prototype — and building out prototypes of sites is one of the things a User Interface developer should be good at. You could find yourself in a situation where you could own a good deal of equity on a small startup if that were what you wanted to do.
Longer term, the things that will carry your career forward are your people skills and business skills — even if you choose not to go into management and stay technical. You’ll need to develop relationships and help people solve business problems.
But user interface developer is a great place to start a career. - Full Post