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Sethumadhavan User
@sethumadhavanuser
Network Security Lead with 10+ years of experience managing large-scale NGFW environments across global. Expertise in Checkpoint, Fortigate, Palo Alto
IndiaWhat I'm looking for
At Tata Communications Ltd., I direct 24x7 security operations and manage critical outages for enterprise infrastructure, helping maintain 99.9% uptime. I also improved firewall efficiency by 10% through policy optimization using Tufin NSPM.
At HCL Technologies Ltd., I managed a fleet of 13,000+ NGFW devices for the American Pharmacy client and monitored device health to support 99.9% availability. I also resolved high-priority L2 security incidents within 24x7 SLA timelines.
Earlier, at TCS, I upgraded Check Point firewalls and strengthened secure access with Cloudflare VPN. Across my network engineering roles, I migrated 100+ sites to SD-WAN and reduced MTTR by 25% through strategic spare delivery.
Experience
Work history, roles, and key accomplishments
TL
Current
Lead Captive Operations
Tata Communications Ltd.
Sep 2025 - Present (1 year)
Directing 24x7 security operations and managing critical outages for large-scale enterprise infrastructure ensuring 99.9% uptime. Leading commissioning of new Palo Alto firewalls for GlobalProtect VPN services and managing an 8-member L2 team.
Managed a distributed fleet of 13,000+ NGFW devices (FortiGate 100D, 120D) and monitored device health globally for 99.9% availability. Executed critical firmware upgrades and managed SSL certificate lifecycles on F5 LTM load balancers.
TC
Upgraded Check Point firewalls from R80.40 to R81.20 and managed License Management and Jumbo Hotfix. Executed DR hardware upgrades and established secure IPsec VPN tunnels, while leading P1 security war rooms.
UG
Migrated 100+ sites to SD-WAN architecture and maintained uptime across 4000+ locations. Configured FortiGate security policies, NAT, and VPN tunnels in a 24x7 support model.
KL
Senior Engineer
Karvy Innotech Ltd.
Oct 2019 - Jan 2021 (1 year 3 months)
Implemented and managed Cisco ISR 1800, 1900 routers and Catalyst 2960 switches for banking operations. Configured VLAN, BGP, and HSRP while reducing MTTR by 25% through strategic spare delivery.
SL
Client Support Engineer
Sequel One Solutions Ltd.
May 2017 - Jun 2018 (1 year 1 month)
Coordinated with vendors, ISPs, and stakeholders for mission-critical link restoration. Isolated line faults in copper twisted-pair cabling and rectified congestion-related application slowness for banking branch offices.
TL
Resident Engineer
TeraVault Datacenter Solutions Ltd.
Jul 2015 - May 2017 (1 year 10 months)
Provided onsite resident engineering support for data center operations and core infrastructure. Maintained network security and high availability for the bank’s critical IT assets.
Education
Degrees, certifications, and relevant coursework
MU
Mahatma Gandhi University
Bachelor of Science, Computer Science
Bachelor of Science in Computer Science.
Tech stack
Software and tools used professionally
Availability
Looking for a job
Location
IndiaAuthorized to work in
Salary expectations
70k-100k INR
Social media
Job categories
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