Marcelo Collado

Business-minded Network Administrator with 2 years of experience supporting Windows Server and Linux environments, determined and focused on managing network infrastructure and optimizing system performance while reducing redundancy. Recognized expert in troubleshooting complex problems and delivering innovative solutions within project scope and compliance requirements, I am also knowledgeable in upgrading software and hardware while continuously monitoring network performance. Enthusiastic about cybersecurity, I have hands-on experience implementing Cisco ASA firewalls, Windows Defender antivirus, and Snort intrusion prevention systems, and I excel at proactive threat detection, patch management, and network hardening. A dynamic team player, I collaborate effectively with HR, vendors, and end-users to ensure seamless onboarding, access control, and operational excellence.

• Reduced network downtime by 40% through implementation of proactive monitoring with SolarWinds NPM and automated alerting.
• Increased network throughput by 25% after redesigning VLAN architecture and optimizing switch trunking.
• Spearheaded migration of legacy switches to Cisco Catalyst 9300 series—completed on schedule and under budget.
• Hardened perimeter security by deploying and tuning Cisco ASA firewalls and Snort IPS, resulting in zero successful intrusion attempts over 6 months.
• Automated backup of critical network device configurations using Ansible playbooks—cut manual backup time from 4 hours/week to 30 minutes/week.
• Led VPN rollout for 50+ remote users using OpenVPN and MFA, improving secure remote access and reducing help-desk tickets by 30%.
• Conducted quarterly vulnerability assessments (Nessus) and patch management cycles, increasing compliance score from 72% to 98%.
• Designed and documented a disaster-recovery network topology, enabling full site failover in under 2 hours.
• Trained and mentored 3 junior administrators on Cisco IOS best practices and network troubleshooting methodologies.
• Coordinated with HR and security teams to enforce role-based access controls in Active Directory, reducing orphaned accounts by 100%.

• CompTIA Network+

• CompTIA Security+