Muhammad Hamaad N.

Linux system administrator and penetration tester. I fix Ubuntu server failures, slow performance and permission problems, tighten network security, and test web apps and APIs. 67 Upwork jobs, 1,400+ hours, IBM and Google certified. Linux server administration - Ubuntu server maintenance, updates and permissions - Fixing service failures and performance issues - Docker deployments, Nginx and SSL - Nextcloud administration - Hyper-V virtual machines - SSH hardening and firewall rules Network and information security - Firewall configuration and VPN troubleshooting - Investigating network failover events through firewall logs - SPF, DKIM and DMARC for email security - SSL certificate monitoring Security monitoring (SIEM) - Wazuh custom rules and decoders, firewall integrations, dashboards and alerts - Splunk log searches and investigations - Microsoft 365 log integration - Investigating Windows file-access alerts Penetration testing and vulnerability assessment - Web app and API testing: authentication, access control, sessions and common OWASP issues - Reports with clear reproduction steps for every finding - Remediation advice, then a retest to confirm the fix works Ongoing monthly support - After a one-off fix or test, I can stay on monthly for patching, health checks, alert reviews and security fixes - A short summary each month: what's done, what's open and what I'd fix next Send me what's broken or what you want tested, and I'll tell you straight if I can help.