Hi! I am Leonard.

Contact

leonard@syslifters.com ( S/MIME cer/pem)

Experience

• since 02/2025 Pentester at Syslifters GmbH
• 2021-2025 Independent Security Researcher
  • Participation in public and private bug bounty programs on Intigriti-recognized by leading companies such as Red Bull, Randstad, Personio, Haufe Group, and Veriff. Top 200 researcher on Intigriti’s All-Time Leaderboard.
  • Identification and reporting of 45+ valid vulnerabilities, over 50% of which have a CVSS score of at least 7; discovered vulnerabilities include SQL Injection, SSRF, Improper Authentication, Business Logic Errors, Improper Access Control, TOCTOU (Race Conditions), Information Disclosure, and Cross-Site Scripting (XSS).
  • Exclusive, sponsored participation in the Intel Knights of Elektron Live Hacking Event 2023 as an Intigriti Top Hacking Talent. Collaboration with internationally leading security researchers and the Intel Developer Team during the event.

Training & Certificates

• Pentesterlab-Bages: White, Serialize, Introduction, Essential, Unix, Blue, Yellow & PCAP
• TryHackMe-Bages: Blue, Webbed, Burp'ed, Hash Cracker bugbountyhunte
• Offensive Security: XXE Attacks Skill Pin
• Root-Me