As a college professor, I am generally available for consulting projects full-time from May through August. During the academic year my availability is reduced. This reduced time is generally used to provide ongoing support for existing clients' projects.
Assignments are accepted on a 1099 or a W-2 basis. 1099 is preferred. I can work through subcontract agencies (at a small premium) if desired.
Fixed price contracts are possible where well-defined specifications and measurable acceptance criteria are delineated.