Senior Next.js / MERN Architect for GPS Tracking Dashboard Fixes

I’m looking for a senior Next.js / MERN developer to fix and improve a GPS tracking dashboard. The project is limited in scope and focused on quick, high-impact work such as dashboard bug fixes, live map/location display issues, API integration cleanup, and small architecture improvements. The ideal developer should understand real-time tracking systems, location data handling, and dashboard UI behavior, and should be able to quickly identify problems and implement clean, stable fixes. Strong experience with Next.js, React, Node.js, Express, MongoDB, Socket.io, and map-based interfaces is preferred. This is not a full rebuild. I need someone senior who can work fast, make good technical decisions, and improve the existing GPS tracking product with minimal supervision.