Full-Stack Developer to Finalize Webapp

A mature Next.js + React + TypeScript web-app is already 80 % complete; my next milestone is a one-month sprint (≈ 6 h/day, remote) to wrap it up, hard-test it and push a rock-solid version toward production... (Budget: $250 - $750 USD, Jobs: AngularJS, API Development, Excel, Express JS, Full Stack Development, Next.js, Node.js, NoSQL Couch & Mongo, PostgreSQL, React.js)