Gabriel Adjei Mensah

Seasoned IT professional with 15 years as Senior Systems Administrator, transitioning to Cybersecurity. Expert in managing complex IT infrastructures, identifying vulnerabilities, and implementing security measures. Top 100 on HackTheBox, top 200 on CyberDefenders, top 2% on TryHackMe. Successful bug hunter on HackerOne. Combines system administration expertise with advanced cybersecurity skills to fortify defenses, analyze attack vectors, and develop security strategies. Applies cutting-edge tactics to bridge traditional IT and modern cybersecurity, staying ahead of evolving threats.

• Bank of Ghana's Cyber & Information Security Directive Implementation (01/2021 to 12/2021): Spearheaded critical initiative aligning cybersecurity practices with Bank of Ghana's Directive. Developed comprehensive policies covering 20+ key areas of cybersecurity and information management. Conducted gap analysis, addressing 50+ vulnerabilities. Implemented advanced encryption and multi-factor authentication across critical systems. Delivered cybersecurity training to 200+ employees, reducing human-error incidents. Established 24/7 SOC, improving threat detection by 60%. Achieved full compliance 6 months early, positioning organization as a financial cybersecurity leader. Reduced overall incidents by 40% in first year, demonstrating significant security posture improvement and operational risk reduction.
• Windows Active Directory & Exchange Modernization Initiative (03/2021 - 05/2021):Led critical Windows Active Directory migration from 2012 to 2022 and Microsoft Exchange upgrade from 2013 to 2019 on-premise. Implemented advanced security features, reducing vulnerabilities by 40%. Optimized system performance, improving email delivery times by 25% and cutting authentication latency by 50%. Executed multi-phase strategy for 200+ users and 20+ servers with zero data loss. Developed staff training program, reducing support tickets by 35%. Implemented real-time monitoring, decreasing system downtimes by 60%.