This app should be generic enough that I feed it a URL or security name and it gets the order books for that security.
Each security on each exchange will write to its own .csv file.
If there is an existing .csv file for that security, it will append the new data. If there is not an existing .csv file for that security, it will create a new .csv file.
Each line in this .csv file will be in this format: Bid Quantity, Bid Price, Ask Price, Ask Quantity, ISO 8601 Date/Time (UTC Time Zone).
If a bid does not have a corresponding ask or vice versa, do not write it. For example, if there are 20 bids in an order book and 19 asks, do not write the 20th bid.
I do business regularly on bitcointalk and /r/jobs4bitcoins. I can provide sources to vouch for me if you like. I pay half up front and half after it is done and I can see it meets my specifications. If you're interested, PM me an offer of how much you want to create this app. Also let me know when you will have it done by. I'll get back to you if your offer is the most competitive ~48 hours from now. Feel free to ask any questions in this thread so others can see the answers.
PM sent.