Please read description here in detail in the link below and PM me with your proposal, also bid on the project. Don't write a generic description in your bid. If you have relevant experience let me know or show a DEMO of a project you've done similar to this. This is only for the backend/admin, the interface for the front end will not be changed in this project. This would be similar and contain a lot of the functionality for a backend for a stock photo site.
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I listed the skills sort of incorrectly. You don't have to have all these skills, or use any of these technologies. Its up to you how you implement it, just please let me know in your proposal. The only MUST is that it must be in PHP.