Sandip Kumar Mondal
Kolkata
Summary
Network Security Engineer with 17+ years of IT experience (13+ years in Network Security) specializing in firewall administration, troubleshooting, and secure enterprise infrastructure support. Expert in Palo Alto, Checkpoint, Cisco ASA/Firepower, and Zscaler (ZIA/ZPA/ZDTA). Highly skilled in packet analysis, incident resolution, and firewall policy implementation. Proven ability to reduce outages, optimize traffic flows, and strengthen security posture for Fortune 500 clients.
Overview
18
18
years of professional experience
1
1
Certification
Work History
Senior Cyber Security Specialist
Cognizant Technology Solutions
Kolkata
05.2020 - Current
- Act as primary escalation point for complex firewall/security issues, providing hands-on troubleshooting across Palo Alto, Checkpoint, and Cisco Firepower environments.
- Implement and administer Zscaler ZIA/ZPA policies; resolve user/application access issues, ensuring seamless secure connectivity.
- Perform deep packet inspection, TCP dump, and Wireshark analysis to identify root causes of security and performance issues.
- Configure and maintain F5 BIG-IP load balancers for secure and optimized application delivery.
- Implement firewall rulebase changes, NAT, and routing updates (BGP, OSPF) to support enterprise applications.
- Collaborated with application, security, and infrastructure teams to proactive troubleshooting.
- Drive incident, problem, and change management processes with CAB approval and PIR reviews.
Sr. Infrastructure Delivery Analyst
Accenture Solutions Ltd.
Kolkata
07.2014 - 04.2020
- Delivered end-to-end firewall administration and troubleshooting for a global enterprise client across corporate offices and data centers.
- Managed Cisco ASA, Checkpoint, and Juniper firewalls, performing impact analysis, rule creation, and security policy optimization.
- Troubleshot critical traffic flow issues using packet captures and reduced downtime for global applications.
- Worked on Routing and switching level issues into the organization network.
- Supported F5 load balancers – configured VIPs, SSL profiles, and performed traffic failover testing.
- Coordinated with ISPs and vendors to minimize outage impact and accelerate root cause resolution.
- Created SOPs for firewall and routing changes, reducing error rates and improving operational efficiency.
- Mentored junior engineers on troubleshooting methodologies and firewall operations, strengthening team capability.
Network Engineer
Wipro Infotech (Pyramid Staffing Solutions)
01.2013 - 07.2014
- Administered Checkpoint firewalls, including NAT and policy rule creation to secure business-critical traffic.
- Supported Cisco routers, Catalyst switches, VLANs, HSRP, STP, and routing protocols (OSPF, EIGRP).
- Provided L3 troubleshooting support for WAN/LAN connectivity, reducing recurring outages.
- Conducted traffic analysis and root cause identification for performance issues, ensuring stable branch connectivity.
- Documented network topology, firewall configurations, and incident reports, enabling faster resolution in future cases.
Technical Team Leader
Allied Digital Services Ltd.
04.2007 - 12.2011
- Provided enterprise-level troubleshooting across PwC, Deloitte, Dell, West Bengal State Cooperative Bank, and The Mobile Store client environments.
- Resolved escalated network/security incidents, maintaining SLA compliance and customer satisfaction.
- Supported MS Outlook, BlackBerry, iOS email clients, and enterprise applications for secure user communication.
- Supervised engineers and handled incident escalation, vendor management, and asset control.
- Delivered hardware/software troubleshooting for 1000+ end-users across multiple client locations.
Education
MCA -
Sikkim Manipal University
BCA -
IGNOU
XII (Science) -
Jharkhand Intermediate Council
X -
Bihar Secondary Education Board
Skills
- Firewall Administration & Troubleshooting
- Palo Alto
- Checkpoint
- Cisco ASA/Firepower
- Zscaler ZIA/ZPA/ZDTA
- Advanced Troubleshooting
- Packet captures
- TCPDump
- Wireshark
- Traffic path analysis
- Security policy debugging
- F5 BIG-IP LTM
- Networking
- Cisco Routing & Switching
- Juniper Firewalls
- Monitoring & Tools
- Splunk
- ServiceNow
- SolarWinds
- ITIL Processes
- Incident Management
- Problem Management
- Change Management
Certification
- Zscaler Digital Transformation Administrator (ZDTA)
- Zscaler ZIA Administrator
- Zscaler ZPA Administrator
- Check Point Certified Security Administrator (CCSA) R77.30
- Cisco Certified Network Associate (CCNA)
- Cisco Certified Network Professional (CCNP - Routing)
- ITIL Foundation
- OEM Trainings: VMWare NSX, F5 BIG-IP Load Balancer
Hobbies and Interests
- Cricket
- Music
- Traveling
Languages
- English
- Hindi
- Bengali
Personal Information
Date of Birth: 01/22/83
Timeline
Senior Cyber Security Specialist
Cognizant Technology Solutions
05.2020 - Current
Sr. Infrastructure Delivery Analyst
Accenture Solutions Ltd.
07.2014 - 04.2020
Network Engineer
Wipro Infotech (Pyramid Staffing Solutions)
01.2013 - 07.2014
Technical Team Leader
Allied Digital Services Ltd.
04.2007 - 12.2011
MCA -
Sikkim Manipal University
BCA -
IGNOU
XII (Science) -
Jharkhand Intermediate Council
X -
Bihar Secondary Education Board