Faruk A.

Senior Linux and Cybersecurity Engineer with 20+ years of hands-on experience supporting enterprise IT infrastructure, troubleshooting production systems, and securing Linux and Windows environments. I specialize in RHEL/Linux administration, server troubleshooting, security hardening, incident investigation, and automation. My background includes supporting hundreds of production Linux servers and working with enterprise security technologies, including DLP, SIEM, and endpoint protection. Whether your server is down, running slowly, experiencing access problems, or showing signs of compromise, I focus on finding the root cause, making safe changes, and verifying the results. Small, one-time troubleshooting projects are welcome. **WHAT I CAN HELP WITH** **LINUX & WINDOWS SERVER ADMINISTRATION** • RHEL, AlmaLinux, Ubuntu, CentOS, and Windows Server • Server troubleshooting, maintenance, patching, and security hardening • SSH/RDP, authentication, sudo, permissions, firewalls, and connectivity • CPU, memory, disk, LVM, filesystems, and performance troubleshooting • Systemd, cron, failed services, application errors, and log analysis • Backup, recovery, monitoring, and infrastructure maintenance **CYBERSECURITY & INCIDENT INVESTIGATION** • Linux and Windows server security assessments • Suspicious login activity, unauthorized access, and security log investigation • SSH hardening, firewall configuration, account security, and patching • Compromised server and website investigation • Security configuration reviews and vulnerability remediation • Enterprise experience with DLP, SIEM, CrowdStrike, and endpoint security technologies **AWS, VPS & WEB INFRASTRUCTURE** • AWS EC2, Lightsail, and VPS troubleshooting • Apache, Nginx, IIS, PHP, and MySQL/MariaDB • WordPress troubleshooting, migration, and compromised-site recovery • DNS, Cloudflare, SSL/TLS, HTTPS, and Let's Encrypt • Server migrations, connectivity problems, and application hosting • HTTP 403, 404, 500, 502, and 503 errors **EMAIL & DNS TROUBLESHOOTING** • SMTP and mail-server troubleshooting • SPF, DKIM, DMARC, and email deliverability • DNS records, SSL certificates, and mail authentication • Email connectivity, configuration, and delivery problems **SCRIPTING & AUTOMATION** • Python and Bash scripting • Linux administration automation • Log collection, parsing, and reporting • Server health checks and monitoring • Scheduled tasks, maintenance scripts, and security checks • Docker and Docker Compose troubleshooting **HOW I WORK** I don't rely on temporary fixes without understanding what caused the problem. My approach is straightforward: 1. Understand the issue and its impact. 2. Review logs, configuration, and available evidence. 3. Identify the likely root cause. 4. Recommend and implement the safest appropriate solution. 5. Test and verify the results. 6. Document the changes and explain what happened. I work independently, communicate clearly through written updates, and take care when making changes to production environments. **AVAILABILITY** I'm based in New Jersey, USA, and available for remote, project-based work after 6 PM Eastern Time and on weekends. I work asynchronously through written communication and can support clearly scoped troubleshooting, security, maintenance, and automation projects. **NEED HELP WITH A SERVER OR SECURITY ISSUE?** Send me a brief description of the problem, the affected environment, and any relevant error messages. I can review the scope and discuss the next steps for a paid engagement.