Create additional data-crawlers using the existing framework

We are hiring php-professionals to create some data-crawlers: All the data-crawlers have to be built on existing infrastructure (Yii Framework based code + mySQL DB). You have to show good understanding of previously created php-code and write some new crawlers in addition to existing ones. All the crawlers are to be paid separately and the price we are ready to pay for each one varying from 50 to 150 USD depending of complexity of certain crawler. Current order: 8 crawlers. Details will be sent upon the request.