Leave them with a binder of project documents that demonstrate your skills in describing and managing projects. Look for gaps in their experience that you can fill. Your most valuable commodities are experience and good judgment. You may be able to invent your job on the spot after finding out what they desperately need to succeed. Realize that your experience with human nature may be a key to their success.
Development is all about interpersonal relationships.
If a team cannot blend and collaborate, it won't produce good work. If you are uncomfortable with a collaborative environment, stick to bricks and mortar. An experienced manager, however, can lend a sense of organization and calm to a frenzied development effort. If you are that person, let it be known. Be prepared for a rapid interview and hiring process if you are seeking a job with an Internet startup.