Web Security Challenge Guide

I'm seeking an experienced professional to guide me through a web security challenge for my course. The challenge involves: - Finding weaknesses to gain system access via backdoors and weak points. I need assistance with: - Testing the challenge safely, step by step... (Budget: $30 - $250 AUD, Jobs: Internet Security, Network Security, Penetration Testing, Risk Assessment, Security Auditing, Technical Writing, Web Security, Website Testing)