We've worked with Whitehat over the past 4 years. They have consistently provided excellent service and advice. They are very responsive and their recommendations are always well thought out and comprehensive. Their pricing is competitive and their commitment to delivering high-quality work is admirable. It's no secret that Whitehat get results - they've worked with clients across the globe to achieve great success. Highly recommended! I'd recommend this firm if you're looking for ethical hackers who know how to break into web applications without leaving any evidence behind. If you want an experienced penetration tester who knows his way around your application, he/she will find vulnerabilities quickly. However, when it comes to exploiting those flaws or finding ways to compromise your servers (which is more than just scanning), then there might be better choices available.