Automated Web Testing at Scale

Hi, I'm looking for an experienced freelancer with the ability to perform website testing and analysis at scale using speed, automation and scale. We're trying to understand how to overcome some web security issues.

Please let me know your past experiences with regards to the above.

Budget : US$ 500
Delivery : 24 hours upon award
Milestone : 1 milestone, to be created upon award and released upon project completion and handover.