Ask HN: Can a senior dev help me structure my POC code base properly?

I started developing a full-stack web app 6 months ago after quitting my finance career, and trying to bring an idea to life. Last week I demo'ed it, and 3 companies tried to acquire me in 2 days! I was shocked and my head is still quite spinning. Yesterday I agreed to a deal, so now I am no longer an indie hacker ;) this means I need to grow my POC into a real scalable app quite fast and I need help! A friend suggested I find a really good developer to help setup the code properly now, before I start hiring people. Get the foundations right first before pouring more people into the mix, especially since I hacked most of the code myself with zero experience. Is there someone here willing to have a chat with me about this and the idea around setting up my web app architecture and initial code foundations? I love programming, creating applications, and helping people by creating technology; feels like I just got thrown in the deep end now and am reaching out for some help to make sure my idea has a chance to survive. My tech-stack: - Python Flask - PostgreSQL - vanilla frontend - Google App Engine Thanks in advance!