You say this like you can just talk with the VP and CFO and have a nuts and bolts conversation about big systems things as an pre-hire IC. You can't negotiate with even medium-sized companies at that level. They have a fixed idea of what the 'role' looks like, and almost always it's full-time, long-term. You can negotiate maybe 10-25% salary increase, but that's it. Good luck even getting more PTO (the "standard" amount is always "generous" and if you got more it would complicate "team dynamics").