Seasoned L3 Network & Security Engineer with 17 years of experience in designing, operating, and optimizing enterprise and MSP networks. Specializes in Juniper MPLS core, BGP/L3VPN, Fortinet solutions, Azure hybrid networking, and Python automation. Led critical infrastructure changes, enhanced security posture, and collaborated with architects and presales teams to deliver resilient solutions.
Overview
18
18
years of professional experience
Work History
Network Engineer L3
Brennan IT
07.2015 - Current
Spearheaded the planning, peer review, and execution of complex, high-risk infrastructure changes involving Juniper MPLS core routing, FortiGate firewalls, FortiManager, and Azure hybrid networking, maintaining a production change success rate exceeding 99%.
Served as the Tier-3 technical escalation lead for critical network and security incidents, reducing Mean Time to Resolution (MTTR) by approximately 35% through advanced troubleshooting and structured Root Cause Analysis (RCA).
Engineered and maintained Brennan IT's multi-tenant MSP core infrastructure supporting thousands of enterprise network devices, improving platform resilience and operational stability across Juniper and Fortinet environments.
Designed and implemented resilient network architectures by eliminating Single Points of Failure (SPOF), improving High Availability (HA) and disaster recovery capabilities across customer environments.
Engineered an automated security remediation solution for a critical Fortinet zero-day vulnerability across 4000+ managed firewalls, reducing remediation time while maintaining service continuity.
Investigated and resolved complex HA cluster failures involving hardware, power redundancy, routing convergence, and failover behavior, improving infrastructure reliability.
Partnered with Presales and Solution Architects to evaluate, validate, and approve enterprise network solutions, ensuring scalable, supportable, and operationally compliant designs before deployment.
Led multiple Proof of Concept (POC) initiatives for emerging networking and security technologies, enabling infrastructure modernization and cost optimization for enterprise customers.
Developed Python automation tools using Netmiko, Paramiko, and Nornir for device auditing, configuration deployment, health checks, and reporting, reducing manual engineering effort by 70–90%.
Produced engineering standards, implementation guides, SOPs, and knowledge articles adopted by L2 operations teams, enhancing service consistency and minimizing repeat incidents.
Mentored L2 engineers through technical coaching, peer reviews, and structured knowledge transfer, improving escalation quality and engineering capability.
Network Engineer
Global Cloud Xchange (Reliance Globalcom)
08.2008 - 07.2015
Contributed to a support team managing over 180 enterprise customers globally, including Ernst & Young, Agility Logistics, and Hilton Hotel.
Functioned as NMC/NOC engineer in Global Assurance team, overseeing network operations for over 300 global clients in a 24x7x365 service environment.
Maintain end to end connectivity and manage links like Leased line, ADSL, SDSL, PSTN lines, Internet links, etc. between customer and service provider.
Troubleshot circuits for packet drops, latency, and slow response. Managed incidents and problems for all customers and attended customer conference calls.
Fault management at Provider (Carriers such as BT, Global Crossing, CMC, etc).
Proactively notify customers of service impacting events.
Utilized network management software like Remedy, SMARTS, Voyance, Vital Suite, Password Officer, SecureCRT to effectively isolate network issues in real-time.
Open carrier/vendor tickets and escalate issues with carrier/vendor in accordance to SLAs.
Accessed routers and switches to identify and resolve network issues.