I'm a developer and 100% happy being a developer writing code for the rest of my life. All I ever want to really do is just write code. Most certainly, I never want to be a project manager, which I liken to secretarial work, or anything involving people management.
At several points in my career, I have faced propositions to diverge my career onto project management. I really don't want to ever do anything other than write code, and am not interested in anything that does not involve programming most of the time.
How can I politely yet firmly communicate my career path preference to stay where I am and not move in the direction that most people perceive as "up" in my chosen career path?
One of my primary concerns is appearing unambitious, which is not the case. I am ambitious, but within the limits of my chosen career path, and am not interested in growing into what some perceive as its natural progression.