Looks like you will need something with good performance, and GOOD programmers that can do fast and optimal code costs a bunch, you won't get away below 50$/hour if you want a good one. Obviously you can get a cheap guy that will do it for less but maybe you won't be happy with the results (since I suppose the bot that scans the pages will need to be quite fast to process the most pages as possible). If someone tells you he will do the bot in PHP you shouldn't even consider to hire him. The admin part is OK but the bot MUST be in C (ask for a multithreaded bot).
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