Continue Development of Node.js + React E-commerce Site for Custom PC Builder

We are looking for a skilled full-stack developer experienced with Node.js and React to continue working on an existing project — Game X, a dark-themed e-commerce platform for selling computer parts and building custom PCs.

Project Status:
Existing codebase available (Node.js backend, React frontend)
Basic functionality for shop and custom PC builder implemented
Hosted on https://gamex.ae

Tasks Required:
Review and understand the current code
Improve performance and UI/UX
Complete features like:
Advanced PC builder with part compatibility checks (Intel/AMD, wattage, case fit)
Payment gateway integration (Etisalat)
SMS gateway integration
Coupon system
Admin panel to manage products, users, and orders
User authentication (Sign in/Sign up)

Requirements:
Proficiency in Node.js, React, and MongoDB (or similar stack)
Experience with e-commerce development
Ability to work with custom APIs and integrations
Clean and well-documented code practices

Nice to Have:
Experience with PC hardware compatibility tools
Familiarity with dark UI design principles

Please share:
Links to similar work you've done
Estimated time to review and complete the remaining work
Your availability and timezone