A full start-to-finish penetration test of a deliberately insecure employee portal, done the way a hired security tester would.
Found five vulnerabilities, including a login bypass (SQL injection), access to other employees' pay records (broken access control), and cross-site scripting.
Rated each finding with CVSS and the OWASP Top 10, and wrote a client-ready report with the business impact and a fix for each, re-tested to confirm it worked.