A lot of fantastic answers here: I second the "YOU need to be one side of the marketplace first" but two questions that I haven't seen appear yet are:

- What draws YOU to build a P2P crowdshipping marketplace? Is it just a hypothesis you have or did you suffer an issue that you can't find any existing company offer?

- Is there absolutely no existing company offering the product you need - why don't you call their sales team and ask them what it would take to build it for you?

I've seen founders find a profitable business that they hated running themselves (horrible founder-market fit) and I've seen founders learn why existing businesses weren't solving that problem (horrible unit economics).

Instead if treating yourself as an engineer excited to build a software stack and show off their skills, consider treating yourself as an investor figuring out the TOP 3 things that could get in your way of getting a positive ROI on your investment.