Full stack developer for an existing React and Next.js web app

I need an experienced full stack freelancer to work on an existing private web application. This is freelance project work only, paid through PeoplePerHour. It is not a job advert, partnership, or unpaid trial.

Stack: React, Next.js, Node.js, PostgreSQL, Supabase, REST and third-party API integration. TypeScript preferred.

The app is already in progress. I need someone who can get up to speed on a real codebase, then help improve the product and ship features: screens, Node APIs, PostgreSQL/Supabase, and external APIs with proper loading and error handling.

How we will start (paid, after a proposal is accepted)
Once a proposal is accepted and payment is set up on PeoplePerHour: I share the project files in the WorkStream. You run the app locally and go through the main flows. We have a paid review session, arranged in the WorkStream, where you explain UI/UX and architecture improvements in priority order. From that we agree the next paid milestone.

Please keep the first review to about 4–6 hours unless we agree more in the WorkStream. If setup is blocked, write there and wait. Do not guess configuration values. This review is paid work, not a free test.

Ongoing work may include React/Next.js screens, Node APIs, PostgreSQL/Supabase, API integration, and structure/performance improvements.

Need: several years of production React and Node, production Next.js, real PostgreSQL and Supabase, live API integration, feature ownership from API through UI, clear written English in the WorkStream.

Please do not: send files or samples in the first proposal (I will use your PeoplePerHour portfolio); share email, phone, or chat apps; suggest working or paying off-platform; propose a full rewrite as step one.

In your proposal: relevant stack experience, hours per week, time zone, start date, and how you would use a 4–6 hour paid first milestone to review setup, UI/UX, and architecture.

All communication, files, and payment stay on PeoplePerHour.