Debjit Hela
Network Security Engineer - 8 Years of Experience
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About
Over 8+ years of experience as an IT Security Professional with expertise in Network Security. Routing, Switching, Firewall Technologies, System Design, implementation and troubleshooting of complex network systems. Implemented firewalls using Palo alto, Panorama, FortiGate.
Experience
Senior Network Administrator - 3i Infotech Pvt.Ltd. - Navi-Mumbai, Maharashtra
(2026-06)
Client: National Commodity & Derivatives Exchange Limited (NCDEX), Project: Yotta DataCentre
- Managed and maintained enterprise routers, switches, and firewalls, ensuring secure, reliable, and high-performance network operations.
- Configured and supported LAN/WAN infrastructure, including routing, switching, VLANs, firewall policies, and network security.
- Monitored network performance, resolved incidents, and ensured high availability and seamless connectivity within the Yotta Data Centre environment.
- Configured and troubleshot Global Protect VPN for secure remote access for mobile and remote users
Network Security Engineer - Awdiz IT Service's LLP - Mumbai, Maharashtra
(2024-01 - 2026-05)
- Configured and maintained enterprise networks using Cisco IOS and IOS-XE, including VLANs, STP, EtherChannel, HSRP, and OSPF/EIGRP routing protocols.
- Troubleshot and resolved Layer 2/Layer 3 network issues (connectivity, routing loops, broadcast storms), maintaining >99.5% network uptime.
- Created and managed Security Policies, NAT rules, and Decryption policies to securely enable business applications. Leveraged App-ID, User-ID, and Content-ID to implement application-aware security policies, replacing traditional port-based rules.
- Monitored and analysed firewall traffic and threats using Palo Alto logs and reports, responding to security incidents.
Freelance corporate Trainer - SLOG Solutions Pvt.Ltd. - Dehradun, Uttarakhand
(2023-04 - 2023-12)
- Delivered engaging and technical training sessions on CCNA topics to groups of IT professionals and career changers.
- Instructed students on configuring and troubleshooting Cisco routers and switches in a simulated network environment. Facilitated deep-dive workshops on complex subjects like network security fundamentals (ACLs, NAT), and WAN technologies
L2 Network Engineer - nSecurities Pvt. Ltd - Burdwan, West Bengal
(2021-03 - 2023-02)
- Maintaining cisco routers and switches and Backup of IOS & Configurations & Troubleshoot.
- Configure (DHCP, IPSEC, POLICY, Routing) in pfSense firewall & L3 Switch.
- Configuration of NAT/PAT, ACL on Cisco routers and Switches.
- Troubleshoot and Configuration of VLAN, VTP, port security, port Channel in Cisco Switches.
- Configuration of Static, Dynamic (OSPF & EIGRP) and Default Routing protocols.
L2 Network Engineer - Peryto - Burdwan, West Bengal
(2021-03 - 2023-02)
- Maintaining cisco routers and switches and Backup of IOS & Configurations & Troubleshoot.
- Configure (DHCP, IPSEC, POLICY, Routing) in pfSense firewall & L3 Switch.
- Configuration of NAT/PAT, ACL on Cisco routers and Switches.
- Troubleshoot and Configuration of VLAN, VTP, port security, port Channel in Cisco Switches.
- Configuration of Static, Dynamic (OSPF & EIGRP) and Default Routing protocols.
NOC Support Engineer - LalaniInfotech Ltd - Kolkata, West Bengal
(2017-11 - 2020-04)
- Monitor network devices, servers, firewalls, and critical services using NOC monitoring tools (SolarWinds, PRTG, Zabbix, etc.).
- Perform L1/L2 support, troubleshoot network issues, and escalate unresolved incidents to higher teams.
- Analyze alerts, alarms, and performance logs to identify network outages or degradation.
- Manage incidents, service requests, and problem tickets within SLA timelines.
- Perform basic configuration and troubleshooting of routers, switches, firewalls, and load balancers.
- Handle ISP coordination for internet links, circuit issues, downtime, and latency problems.
- Conduct remote troubleshooting via SSH, RDP, Telnet, and console sessions.
- Support WAN, LAN, VPN, DNS, DHCP, NAT, and routing issues.
- Maintain documentation of network events, incident reports, SOPs, and daily operational logs.
- Perform scheduled maintenance tasks, patch updates, and health checks on systems.
Education
Bachelor of Arts - BA - Netaji Subhas Open University, Kolkata (2019)
Higher Secondary - 12th - Burdwan Sri Ramkrishna Saradapith Uchcha Vidyalaya (2010)
Secondary School - 10th - Burdwan C.M.S High School (Morning) (2008)
