Sr. Network Security Engineer

Role & responsibilities

Roles & Responsibilities :

We are seeking a Senior IT/OT Network Engineer with a world-class foundation in Core Networking (Layer 2/3) and Secure Site-to-Site Connectivity who would be working on customer products/projects

Qualifications

SKILLS Needed:

Networking (L2/L3): Switching, STP, VLANs, BGP, OSPF, VRF, routing protocols

Firewall & Security: Cisco ASA / FTD / FMC, DMZ, Context design, segmentation

Zero Trust: ZPA / ZIA / Cisco ZTA, MFA, privileged access

Cloud AWS (Mandatory): VPC, EC2, Transit Gateway, Direct Connect, virtual firewall

Standards (Awareness): IEC 62443, NIST CSF, ISO 27001, Purdue Model

Certifications (Preferred): CCNP / CCIE, AWS Advanced Networking, CISSP

MUST-HAVE REQUIREMENTS

•       Layer 2 / Layer 3 Networking — VLANs, STP, BGP, OSPF, VRF — must have designed in real environments, hands-on configuration experience on Cisco devices (Switches/Routers/Firewalls)
•       Firewall Architecture — Hands-on Cisco ASA / FTD / FMC, DMZ, Context and segmentation design
•       Zero Trust — Replaced VPN with ZTA, experience with Zscaler or Cisco ZTA
•       AWS Cloud Networking — VPC, EC2, Transit Gateway, Direct Connect, Security Groups, virtual firewall on EC2 — mandatory, not optional
•       Standards Awareness — Knows IEC 62443, NIST CSF, ISO 27001, Purdue Model at a conceptual level — does not need deep implementation experience

CLOUD NETWORKING DETAIL

Candidate must have hands-on AWS experience. Azure or GCP knowledge is a bonus but AWS is required.

•       VPC & Subnets — Design public/private subnets, route tables, internet gateway, NAT gateway
•       EC2 — Launch and configure instances, assign ENIs, Elastic IPs, IAM roles, Auto Scaling
•       Virtual Firewall on EC2 — Deploy Cisco FTDv, Palo Alto VM-Series, or FortiGate as EC2 instances
•       Virtual Router on EC2 — Deploy software routers (Cisco CSR 1000V / VyOS), BGP peering in AWS
•       Connectivity — Direct Connect, Site-to-Site VPN, Transit Gateway for hybrid and multi-site
•       Security — Security Groups, NACLs, AWS Network Firewall, VPC Flow Logs, CloudTrail

STANDARDS — AWARENESS LEVEL IS ENOUGH

Candidate should be able to discuss these standards in an interview — not implement them from scratch.

IEC 62443: Industrial cybersecurity standard — security zones, conduits, and security levels

NIST CSF: Identify, Protect, Detect, Respond, Recover — risk-based security framework

ISO / IEC 27001: Information security management system (ISMS) — how security is governed

Purdue Model: Layered industrial network model — why OT/IT segmentation is designed in levels

NERC CIP: Power grid cybersecurity compliance — awareness is fine for energy sector projects

EXPERIENCE EXPECTATIONS - Mandatory

•       Experience — 8 to 10 years in network engineering
•       Ownership — Has owned design and implementation decisions — not just followed instructions
•       Leadership — Can review team designs, mentor engineers, and drive technical direction along with hands-on demonstration of core skills mentioned above
•       Communication — Comfortable speaking to executives, customers, and compliance teams
•       Certifications: CCNP

WHAT TO LOOK FOR IN A RESUME

•       Job Titles — Sr. Network Security Engineer
•       Cloud Projects — VPC designs, hybrid connectivity, virtual firewall/router deployments on EC2
•       Certifications (Good-to-have) — CCIE, AWS Certified Advanced Networking, AWS Solutions Architect, CISSP

GOOD TO HAVE — NOT MANDATORY

•       Any OT / SCADA exposure — even at project or client level
•       Azure or GCP networking — as an addition to AWS
•       Infrastructure as Code — Terraform, CloudFormation, or Ansible for network automation

Preferred candidate profile

Perks and benefits