Senior Full-Stack React Developer – Finish & Launch Web App (Vercel/Supabase)

Job Description:
We're a growing Australian product company looking for an experienced full-stack developer to finish and launch a web app that's already partially built. This is a one-time gig with a clear scope: polish, test, fix, and get it production-ready. If it goes well, there's a strong chance of ongoing work on future phases (additional features and integrations).
The Stack:

React (frontend)
Supabase (auth + database)
Vercel (hosting/deployment)
REST API integration with a third-party business system

What you'll be doing:

Polishing the UI and making it fully mobile-friendly (our users are on phones in the field)
Completing remaining frontend features and flows
Wiring up and testing API integrations
Thorough testing across devices — finding and fixing bugs before launch
Getting the app deployed and running properly in production

You're a great fit if you:

Have 4+ years of full-stack React experience
Can work independently with minimal hand-holding
Know Supabase and Vercel well
Have integrated third-party REST APIs (HMAC auth experience a plus)
Write clean, documented code
Communicate clearly in English and proactively flag blockers

Nice to have:

Experience with mobile-first, form-heavy apps
Familiarity with business/CRM API integrations

To apply, please include:

Links to 2–3 React apps you've built (live URLs preferred)
A short note on a tricky bug or integration you solved recently
Your availability and hourly rate
The word "screen" at the top of your application so I know you read this

Applications without portfolio links won't be considered.