For what it's worth, Pivotal Labs bills on a time & materials basis. But we're not billing to create software, we're billing to help you learn how to build it y

For what it's worth, Pivotal Labs bills on a time & materials basis. But we're not billing to create software, we're billing to help you learn how to build it yourself -- and to teach your own to do the same. Disclosure: I work for Pivotal in R&D.