Senior Network & Security Engineer (Cisco Technologies) | CES Limited | Kolkata, India

CES Limited; Kolkata District; On-site; INR 4,500,000 - 7,500,000; Full time

Job summary

CES Limited is seeking a Senior Network & Security Engineer to manage enterprise Cisco networking and security environments. The role requires hands-on expertise with Cisco switching, wireless, firewalls, ISE, and SNA to ensure high availability, security, and performance across large-scale operations.

The ideal candidate will own incident resolution, perform root cause analysis, and drive security hardening and network transformations in a mission-critical setting.

Qualifications

• Bachelor's Degree in CS/IT or related field.
• 10+ years hands-on experience in Network and Security Engineering.
• Strong expertise in Cisco enterprise networking technologies.
• Hands-on experience with Cisco Wireless networking solutions.
• Strong knowledge of Cisco Switching technologies in enterprise LANs.
• Extensive experience with Cisco FTD and FMC.
• Hands-on experience with Cisco ISE.
• Strong knowledge of SNA and network visibility platforms.
• Experience troubleshooting complex Layer 2/3 issues.
• Knowledge of routing, switching, VLANs and network segmentation.

Responsibilities

• Manage, configure, and support enterprise Cisco network and security infrastructure.
• Troubleshoot and resolve complex Layer 2 and Layer 3 network issues.
• Administer Cisco switching/routing environments for optimal performance.
• Manage Cisco Wireless infrastructure incl. APs/controllers and wireless security.
• Configure and troubleshoot Cisco FTD and FMC platforms.
• Manage Cisco ISE for authentication, authorization, and access control.
• Monitor network traffic and security events using SNA.
• Perform root cause analysis and implement corrective actions.
• Support firewall policy management and security compliance.
• Coordinate with Cisco TAC and vendors for issue resolution and escalation.

Skills

Cisco networking

Network security

Troubleshooting

Documentation

Stakeholder management

Education

Bachelor’s Degree in Computer Science/IT

Tools

Cisco FTD/FMC

Cisco ISE

SNA

Network analytics

Firewalls

Job description

Job Title

Senior Network & Security Engineer (Cisco Technologies)

Company

CES Limited

Location

Kolkata, India

Job Type

Full-Time

Position Summary

CES Limited is seeking a highly experienced Senior Network & Security Engineer to manage and support large-scale enterprise networking and security environments. This role is ideal for professionals with deep expertise in Cisco networking, network security, wireless infrastructure, and advanced troubleshooting who can independently manage critical production environments and complex technical issues.

Detailed Job Description

As a Senior Network & Security Engineer, you will be responsible for the administration, optimization, troubleshooting, and ongoing support of enterprise-grade Cisco network and security infrastructure. You will play a key role in ensuring network availability, security, and reliability while supporting large-scale business operations. The role demands hands-on expertise across Cisco switching, wireless technologies, firewalls, identity management, and network analytics platforms. You will work closely with internal operations teams, OEM vendors, and Cisco TAC to resolve complex incidents, implement enhancements, and ensure the network infrastructure remains secure and resilient. This is an excellent opportunity to work within a mission-critical environment requiring strong technical ownership and proactive operational management.

Key Responsibilities

• Manage, configure, and support enterprise Cisco network and security infrastructure.
• Troubleshoot and resolve complex Layer 2 and Layer 3 network issues.
• Administer Cisco switching and routing environments to ensure optimal performance and availability.
• Manage Cisco Wireless infrastructure, including access points, controllers, and wireless security.
• Configure, maintain, and troubleshoot Cisco Firepower Threat Defense (FTD) and Firepower Management Center (FMC) platforms.
• Manage Cisco Identity Services Engine (ISE) for authentication, authorization, and network access control.
• Monitor and analyze network traffic and security events using Cisco Secure Network Analytics (SNA).
• Perform root cause analysis and implement corrective actions for recurring incidents.
• Support network security operations, firewall policy management, and security compliance initiatives.
• Coordinate with Cisco TAC, OEM vendors, and internal stakeholders for issue resolution and escalation management.
• Participate in infrastructure upgrades, migrations, security hardening, and network transformation projects.
• Maintain technical documentation, network diagrams, operational procedures, and knowledge repositories.
• Ensure adherence to service levels, operational standards, and security best practices.

Required Qualifications & Skills

• Bachelor’s Degree in Computer Science, Information Technology, Electronics, Telecommunications, or a related field.
• Minimum 10 years of hands‑on experience in Network and Security Engineering.
• Strong expertise in Cisco enterprise networking technologies.
• Hands‑on experience with Cisco Wireless networking solutions.
• Strong knowledge of Cisco Switching technologies and enterprise LAN environments.
• Extensive experience with Cisco Firepower Threat Defense (FTD) and Firepower Management Center (FMC).
• Hands‑on experience with Cisco Identity Services Engine (ISE).
• Strong knowledge of Cisco Secure Network Analytics (SNA) and network visibility platforms.
• Experience troubleshooting complex Layer 2 and Layer 3 networking issues.
• Strong understanding of routing protocols, switching technologies, VLANs, and network segmentation.
• Experience managing firewalls, security policies, network access controls, and threat mitigation strategies.
• Proven experience in incident management, root cause analysis, and production support environments.
• Strong communication, stakeholder management, and documentation skills.
• Ability to work independently in high‑availability and mission‑critical environments.

Nice-to-Have Skills

• Cisco Certified Network Professional (CCNP) Certification.
• Cisco Certified Internetwork Expert (CCIE) Certification.
• Experience with Software-Defined Networking (SDN) and network automation.
• Knowledge of Python, Ansible, or network automation frameworks.
• Experience with SIEM platforms, SOC operations, and cybersecurity monitoring solutions.

Recruitment Pro Tip

To maximize your chances of being shortlisted, ensure your CV prominently features Cisco Wireless, Cisco Switching, Cisco FTD, Cisco FMC, Cisco ISE, Cisco Secure Network Analytics (SNA), Network Security, Firewall Management, Routing & Switching, Layer 2/Layer 3 Troubleshooting, TAC Support, Incident Management, Root Cause Analysis, and Enterprise Network Operations. Quantifying achievements such as uptime improvements, security enhancements, large-scale migrations, or critical incidents resolved will significantly strengthen your application.