I am an UI developer at a large US firm and I was hired specifically to do the UI work. During my year-end review, my boss congratulated me for my work and told me he expects that I take additional responsibilities for next year similar to product management kind of role. He also stressed that I should build a career within the firm so he wants me to come up with a plan about where I want to be in the next three years.
However, I have no interest in taking additional responsibilities at work or building a career for that matter because I am just not interested. I solely want to focus on writing UI code - that is my best interest. I consider myself a very talented in UI developer compared to my colleagues because I am a master in it and work everyday to keep the skills up in this fast changing industry.
Could I face any dire consequences for not taking additional responsibilities at my work? Or can I last long in the company? How do I tell my boss that I am simply here to do my job and fulfilled by it?