Seeking MERN Stack Specialist to Troubleshoot Real-Time SaaS Dashboard

We are finalizing a custom team collaboration and task management platform. The core application is built using MongoDB, Express, React, and Node.js. We are at the 90% mark, but we have hit a few complex technical roadblocks right before our beta launch. We need an expert to step in, debug the remaining issues, and push us over the finish line. The Challenge (What needs fixing): Live Data Syncing: We use WebSockets (Socket.io) for real-time notifications and chat, but connections keep dropping, and the React frontend is occasionally rendering duplicate messages. Role-Based Access Control (RBAC): Admin and standard user permissions are overlapping. We need the Node.js middleware audited and tightened up to properly secure specific API routes. Dashboard Lag: The main analytics page pulls complex reports from MongoDB. The current Mongoose aggregations are inefficient, causing severe UI lag when loading large datasets. The Ideal Developer: You thrive on debugging and optimizing rather than just building from scratch. You have deep experience managing complex global state in React without causing infinite re-renders. You know how to properly structure MongoDB queries and indexes for maximum speed. You write clean, modular code and can easily navigate a repository built by another developer.