Flutter UI Overhaul & Bug Fix

I'm looking for someone to improve the UI of my Flutter app, specifically the navigation bar, and address some connectivity and data parsing issues.

Key Tasks:
- Modify the navigation bar to enhance user experience
- Fix bugs related to MQTT broker connection
- Adjust JSON parsing to be softcoded
- Ensure the app can connect to the web and fetch values

Ideal Skills:
- Extensive experience with Flutter
- Strong problem-solving abilities for bug fixing
- Proficient in UI/UX design principles
- Understanding of MQTT protocol and JSON parsing

Please only apply if you can start immediately and have a portfolio showcasing similar projects.