Online Test Portal Build

I need a robust, web-based testing portal that can confidently handle 500+ simultaneous test-takers without any perceptible lag. Administrators must be able to create syllabus-driven, timed assessments,... (Budget: ₹12500 - ₹37500 INR, Jobs: AngularJS, Backend Development, Cloud Computing, Database Management, Django, Frontend Development, Node.js, PHP, Python, Web Development)