Senior Full-Stack Developer Needed – Audit, Debug, Test & Optimize Existing Web App

I am seeking an experienced full-stack developer to professionally audit, test, debug, and stabilize my existing interactive website built with Hostinger Horizons. This is NOT a rebuild. I need a hands-on... (Budget: $750 - $1500 USD, Jobs: API Integration, Backend Development, Database Management, Debugging, Full Stack Development, JavaScript, Performance Tuning, Security Auditing, Testing / QA, Web Development)