Full-Stack Developer for FitTech MVP

I am looking for a talented Full-Stack Developer to build the MVP version of "FitEngine", a web platform designed for fitness coaches to manage their clients and generate workout and nutrition plans. Key Features of the MVP: 1. Coach Dashboard & Multi-Tenancy: Each coach can register, subscribe via a payment gateway (e.g., Stripe/Paymob), and manage their own clients in an isolated dashboard. 2. Client Profiles: Capture comprehensive client data (Age auto-calculated from DOB, height, weight, target budget, dynamic meal preferences, and training frequency). 3. Smart Nutrition Builder: Dynamic meal customizer (flexible number of meals/snacks), automated calorie calculation, a draft plan generator based on templates, an estimated food budget tracker, and a client-side "Food Auto-Swapper". 4. Flexible Workout Builder: A fully customizable workout builder where coaches can design any split freely. Features include a client-side "Exercise Swapper" and a weekly progressive overload/weight tracker. 5. UX & Customization: Real-time auto-save, white-labeling (coaches can upload their logo and choose brand colors), automated WhatsApp messaging integration, and PDF exporting. Preferred Tech Stack: Next.js / React with Supabase, or any scalable alternative you highly recommend for a fast MVP. Please share your previous relevant work (SaaS, Dashboards, or FitTech applications) and your estimated budget/timeline for this project.