Learning Management System

Need help developing a learning management system. I have a hosting & Domain already. I just want a strong developer who can ready made my site. You may use any CMS you wish (e.g. Drupal, wordpress, Joomal, ertc..) or you may use your own coding language to do this but the LMS required must have all the following Features: The system should be able to handle 2000 concurrent users at the same time & unlimited tests unlimited questions & surveys as follow: - Creating Tests, quizzes, various essay items, Multiple choice, Multiple response, Fill in the blanks, Hotspot, Multimedia question - Creating Evaluations / Surveys - Creating users, user profile - Reporting (users must be able to access their profiles & view their completed tests, scores, details, Statistics progress and results for students) – - Admin should be able to see (test summary report, user test report, customize report. - Admin should be able to group users into category or Department (for example 200 users in category “Marketing” 300 users in Category “Finance” then generate report to specific category with their test result & scores. - system must have Roles (Admin, Teacher, Student, Developer) - e-Learning capabilities ( Courses, Course catalogue, Learning, etc..) - may include Videos, Audio, Power Point - Evaluations Module, by user by Group or by Category, - Chat Module among students & Teacher, Online student helpdesk - Send students a message - News & notifications - Activity feed (Likes, Comments) - Lesson, Assignment, Assessment, Pre-test, Skill assignment,Evaluation,Scorm-course,360 degrees feedback assessment. Good luck