Next.js / Supabase developer to turn a working prototype into a production SaaS app

I have an existing web app built with Next.js and Supabase, hosted on Vercel. It is already in daily use. I'm looking for an experienced developer to review it and help turn it into a commercial SaaS product. Stage 1 (this job): - Review the existing code and point out issues with security, structure and performance - Recommend how to make it production-ready and usable by multiple businesses - Give a quote and timeline for the next stages You'll need: - Strong Next.js, React and Supabase/PostgreSQL experience - Experience building and launching SaaS products - Experience integrating third-party APIs - Clear communication and some overlap with Australian business hours (AEST) To apply: - Links to 2–3 live apps you've built (Next.js/Supabase preferred) - A short description of the most similar project you've worked on - Start your proposal with the word "Ledgerline" so I know you've read this An NDA must be signed before any project details or code are shared. The budget is for Stage 1 only. Further stages will be quoted separately.