Hi there!
I am a web developer familiar with NodeJS technologies, and to an extent, real-time libraries (see my portfolio for details). I have been working with MongoDB frequently (specifically, via Mongoose) in a lot of my recent projects. While I do admit that I am not too familiar with web crawlers, I believe that I can learn and provide the service you need within your time frame. I can guarantee that I will be able to complete the project on time. I hope you consider hiring me for this project!
Regards.