Developer Needed to Fix Email & In-App Notifications on Selltray.com

I’m looking for an experienced developer to help fix and properly set up the notification system on Selltray.com. The site was built with Lovable, so I need someone comfortable working with Lovable-generated code and whatever stack the project uses, likely React, TypeScript, Tailwind, and Supabase. The goal is to make sure users receive notifications correctly when important actions happen on the platform. The developer needs to review and fix: User notifications Message notifications Email notifications In-app notifications Notification triggers Database logic User roles and permissions Supabase functions or backend logic Email delivery issues Spam/deliverability issues if emails are involved I need someone who can audit the current setup, find why notifications are not being sent or received properly, and fix it the right way. This is for Selltray.com, a local marketplace platform where users can post items, services, jobs, businesses, and connect with people. Please only apply if you have real experience with React/Supabase apps, notification systems, and fixing bugs in existing code. When replying, please include: Your experience with Lovable, React, and Supabase Examples of notification systems you have worked on How you would approach fixing this Estimated turnaround time Your project price or hourly rate