End-to-End Web App QA

I’ve reached the stage where my customer-facing web app needs a thorough quality check before launch. I want every key journey—sign-up, login, product selection, checkout and payment—walked through as a real shopper would... (Budget: ₹100 - ₹400 INR, Jobs: Android, JMeter, Selenium, Test Automation, Testing / QA, Usability Testing, Web Testing, Website Testing)