online examination portal with video monitoring

I am looking for a developer to create an online examination portal, with video monitoring, using moderate security measures. The exams will be based on Multiple Choice Questions and I am expecting more than 100 users to use the portal simultaneously. The developer must have prior experience in creating such portals and have an understanding of security protocols for the same. Legally binding contracts will be signed before the start of the project. I am looking forward to your offer.