Hi, Bhargav here. I have read your requirements and would like to start working in your project. We are a team of developers working on php, python, linux. Do you need a web interface where users can login and transfer files?
Well the criticality is high as we need to implement a lot of security measures, so I have placed my bid high than your range. But I can guarantee the quality of our end product will be more than you have expected.
Thanks, and waiting for your valuable reply.