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 developer who works directly with source code, databases, APIs, debugging tools, and testing—not someone simply entering prompts into an AI builder.

The site includes interactive calculators, astrology/chart calculations, quizzes, AI-generated personalized results, user profiles, saved data, payments, ads, and mobile/desktop functionality. Identify and fix bugs, calculation errors, backend/database issues, broken features, performance and security concerns, then thoroughly test everything.

I am considering eventually moving away from Hostinger Horizons, but I am NOT committed to migrating now. I want your professional assessment of the current setup, its limitations, and whether/when migration makes sense.

Target: 3–5 business days. Long-term ongoing work available for the right developer.