... Solo builder here, won't say much about the product yet but happy to talk shop on the plumbing. Quick version of what I'd tell my past self: Auth - Supabase, Clerk, Auth0, pick one. An afternoon of setup vs. days of building it badly. I tried the days version first, do not recommend. Permissions - this is the sneaky one. Most people check "can this user see this?" in their app code. Way better to push the rule into ... ... PayPal into your app, compared to something like Stripe? How long did this take you to make, and was there any speed bumps in the process that took you longer than you hoped to resolve? Comment from Vihaan Kodiganti(@vsync