Fix & Harden My Next.js + Supabase Marketplace App — AI-Powered Improvements Sprint (Fixed Price)

I run a two-sided marketplace web app (buyers and sellers) that's live with early users. It's built with Next.js App Router, Tailwind, and Supabase on Vercel, with Stripe for payments. The product works, but a handful of known issues are hurting the user experience, and I want them fixed in one focused sprint by someone who's comfortable working in an existing codebase. I’m also interested in adding AI-powered improvements where they make sense, such as smarter search, AI-assisted product discovery, recommendations, or improving marketplace user experience. What I need done (fixed scope, list provided on hire): Resolve 4–6 documented issues: a checkout edge case, two mobile layout breaks, a slow seller-dashboard page, and form validation gaps Tighten the Supabase Row Level Security policies on our listings and orders tables — provide a short written summary of what changed and why Explore and implement practical AI-powered enhancements where applicable Leave the code better than you found it: clear PRs, sensible naming, no drive-by rewrites What you get from me: Repo access, a staging environment, and a written issue list with reproduction steps on day one Fast answers — I respond within a few hours on weekdays More work if this goes well: AI features, search & filtering improvements, in-app messaging, and seller payout flows are next on the roadmap Who this suits: You've shipped and maintained production Next.js (App Router) apps — you know Server Components vs Client Components without googling it You've worked with Supabase Postgres and can read/write RLS policies confidently You've touched Stripe in a real product Experience with AI integrations (LLMs, embeddings, AI search, recommendations, or automation) is a plus You communicate clearly in writing and don't disappear mid-task Budget & timeline: $100 fixed