I just wanted to add a testimonial & a bit of context about the above link. I've been on the 10x Management engineering roster for 5 years now, and they've always been stellar at finding clients and freelance gigs, negotiating and closing deals, etc. They recently expanded their "beta" testing of a new service they've rolled out called Agent on Demand (in short they help top engineers to negotiate their new, fulltime, employment contracts), and I was lucky enough to be one of the first people to benefit from their guidance during a hiring process.

10x played the roll of an advisor/mentor, guiding me in the negotiation -- on salary, benefits, figuring out what I wanted, etc. They were fantastic in this: instead of feeling like I was in the dark, not knowing what I could ask for, not being sure of my next move, I was coached into asking for the things I wanted (and/or that I didn't think I could get) and ended up very happy with the resulting package (PTO, clear definition of my role, etc.) Having an experienced "wingman" helps, tremendously...!

If you've got a real job offer and want help negotiating it, I would recommend trying them out - and during this expanded beta period, the service is pay what you want, so it's quite reasonable to engage them. Happy to answer questions. Cheers