Senior Next.js / React Freelancer

About the project I'm the product owner of a live nutrition coaching platform. I'm looking for an experienced full-stack developer to modernize and overhaul our coach dashboard and several web properties, working closely with me over the next few weeks. Tech stack Next.js (App Router) React / TypeScript REST API integration Tailwind CSS What you'll do Bring our coach dashboard and websites up to the latest standard (code quality, structure, performance, modern best practices) Work through the project together with me, step by step — analyze first, propose, then implement Refactor and clean up existing code without breaking the live product Integrate with our existing API How we work I value a structured, senior approach: analyze the real code first, confirm the plan with me, then build — no guessing, no superficial fixes. MUST-HAVE requirements (please read carefully before applying) ⚠️ Claude Code is a MUST-HAVE. You must already work with Claude Code daily and know how to use it professionally — writing precise instructions, reviewing and verifying its output, and never blindly shipping AI-generated code. This is non-negotiable. ⚠️ German is required. All communication will be in German. Strong, proven experience with Next.js, React, TypeScript and API integration. Able to work on a live production codebase carefully and responsibly.