I have been developing similar software (web spiders, crawlers and bots) for several years now and I'm free to say that I know my craft :). I placed a lowest bid in this moment because I consider this an easy job and I'm very confident that I can deliver professional results. I'm also able to implement required software in several languages and frameworks, including C++, PERL, Python, Java, so feel free to contact me if you have any additional questions.
Best regards,
Srđan