L3 Network Security Engineer

2 days ago

Mumbai, Maharashtra, India Neev Full time ₹ 12,00,000 - ₹ 36,00,000 per year

Job Description – L3 Network Security Engineer (Infrastructure Specialist)
Role: L3 Network Security Engineer
Department: Cybersecurity / Infrastructure Security Operations
Location: (Specify)
Experience: 5–10 Years
Type: Full-Time
Role Overview

This role requires a senior, infrastructure-heavy L3 Security Engineer responsible for advanced operational management and troubleshooting of network firewalls, IDS/IPS, WAF, proxies, and secure email gateways. The engineer will act as the final technical escalation point for critical network security issues and play a key role in maintaining and optimizing the enterprise security infrastructure.

The ideal candidate must have deep hands-on experience with security appliances and tools, strong analytical skills, and the ability to support SOC teams with L3-level investigations.

Key Responsibilities
1. L3 Operational Support

  • Serve as the L3 escalation point for network security infrastructure issues.

  • Handle advanced troubleshooting and deep-dive analysis for:

    • Firewalls (rules, NAT, VPNs, routing issues)

    • IDS/IPS (signature tuning, alert analysis)

    • WAF (policies, false-positive reduction, rule adjustments)

    • Proxy solutions (URL filtering, SSL interception, policy enforcement)

    • Email gateways (anti-phishing, anti-spam, delivery issues)

  • Perform system health checks, upgrades, patches, and configuration audits.

2. Infrastructure Management

  • Ensure the stability, performance, and security of the following systems:

    • Enterprise firewalls

    • IPS/IDS platforms

    • WAF appliances or cloud-based WAF

    • Proxy servers or cloud proxies

    • Secure Email Gateways

  • Monitor utilization, performance metrics, HA configurations, and redundancy.

3. Policy & Configuration Management

  • Review and optimize firewall, IPS, and proxy policies.

  • Manage and evaluate change requests for infrastructure modifications.

  • Apply best practices for access control, segmentation, and zero-trust implementation.

4. Incident Response Support (L3)

  • Support SOC teams by analyzing security events from infra devices.

  • Participate in incident bridge calls for major security issues.

  • Conduct root cause analysis (RCA) after incidents related to infrastructure components.

5. Threat Detection & Tuning

  • Tune firewall, IDS/IPS, WAF, and proxy rules to reduce false positives.

  • Enhance detection coverage and strengthen security controls.

  • Perform traffic analysis using logs, packet captures, and monitoring tools.

6. Documentation & Reporting

  • Maintain complete documentation of infrastructure components and configurations.

  • Prepare operational reports, incident summaries, and RCA documents.

  • Keep knowledge base updated for L1/L2 teams.

Required Technical Skills
Core Expertise (Mandatory)

  • Strong hands-on experience with:

    • Next-Gen Firewalls (Cisco ASA/FTD, Palo Alto, Check Point, Fortinet)

    • IDS/IPS platforms (Firepower, Snort, Suricata, Palo Alto Threat Prevention)

    • WAF solutions (F5 ASM, Imperva, Cloudflare/Akamai WAF)

    • Proxy technologies (Blue Coat, Zscaler, Squid)

    • Email Security Gateways (Cisco ESA, Proofpoint, Mimecast)

  • Experience with routing, switching, IPSEC/SSL VPNs, DNS, DHCP.

  • Proficiency with log analysis tools and packet capture (Wireshark, tcpdump).

Preferred Tools Experience

(Any combination is acceptable)

  • FireEye appliances

  • Cisco ASA/Firepower

  • Cisco ISE

  • Arbor DDoS

  • AlgoSec/FireFlow

Soft Skills

  • Strong problem-solving and analytical skills.

  • Ability to handle high-severity incidents under pressure.

  • Excellent communication with cross-functional teams.

  • Good documentation and reporting skills.

Preferred Certifications

  • CCNP Security / CCIE Security

  • CISSP (added advantage)

  • GIAC (GCIA, GCIH, GCFA)

  • CEH / CHFI

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