Senior Network Engineer

SISL Global; Burlington (NJ); On-site; USD 110,000 - 170,000; Full time

Job summary

SISL Global is seeking an experienced network engineer with strong routing and switching expertise and hands-on data center, SD-WAN, and security tooling experience. The role emphasizes automation using Python, Ansible, Terraform, and Git, plus IaC and NetBox/Nautobot integration.

Collaboration with architects and SRE teams is essential to ensure reliable, scalable network operations. The ideal candidate demonstrates proficiency in FortiGate and related Fortinet products, with exposure to

Qualifications

• Experience in network engineering / NOC / NRE / NetDevOps roles.
• Strong core networking knowledge: Routing & Switching (BGP, OSPF, EIGRP, STP, VLANs, VRFs, HSRP/VRRP).
• Hands-on in Enterprise LAN/WAN, SD-WAN, Data Center (Nexus/ACI), WLAN, firewalls, or load balancers.
• Design, build, and maintain network automation using Python, Ansible, Terraform, Git, CI/CD.
• Infrastructure as Code (IaC) for configuration and lifecycle management.
• Integration with NetBox/Nautobot and ITSM tools (ServiceNow).
• Develop reusable modules, playbooks, and pipelines for provisioning, upgrades, backups, and compliance.
• Python with network libraries (Netmiko, NAPALM, pyATS).
• Git & CI/CD: branches, merge requests, and basic pipelines.
• VDOM Design & Administration; HA Deployment & Troubleshooting.
• Observability stacks: SolarWinds, DNAC, ThousandEyes, Prometheus/Grafana, Splunk/ELK.
• TCP/IP, DNS, DHCP, VPNs, QoS troubleshooting.
• Collaborate with network architects, SRE, and application teams to embed reliability by design.
• Contribute to network design reviews focusing on resilience, capacity, and automation readiness.
• Create and maintain runbooks and documentation for ops teams.
• Mentor engineers on NetDevOps, automation, and reliability best practices.
• FortiGate Administration & Troubleshooting
• FortiAnalyzer Log Analysis & Reporting
• FortiAuthenticator (MFA, RADIUS, TACACS+)
• FortiOS Upgrades, Patching & Lifecycle Management

Skills

Network engineering

NOC/NRE/NetDevOps

Routing & Switching

BGP

OSPF

EIGRP

HDVR/VRFs/HSRP

SD-WAN

Data Center (Nexus/ACI)

WLAN

Firewalls/Load balancers

Python

Ansible

Terraform

Git

CI/CD

NetBox/Nautobot

ServiceNow

Netmiko/NAPALM/pyATS

FortiGate Administration

FortiAnalyzer

FortiOS upgrades

Monitoring stacks

SolarWinds

Prometheus/Grafana

Tools

NetBox/Nautobot

ServiceNow

Netmiko

NAPALM

pyATS

Git

Ansible

Terraform

FortiGate

Job description

• Experience in network engineering / NOC / NRE / NetDevOps roles.
• Core Networking: Strong in Routing & Switching (BGP, OSPF, EIGRP, STP, VLANs, VRFs, HSRP/VRRP, etc.).
• Network Domains: Hands-on in one or more areas – Enterprise LAN/WAN, SD-WAN, Data Center (Nexus/ACI), WLAN, firewalls, or load balancers.
• Automation & NetDevOps:
• Design, build, and maintain network automation using Python, Ansible, Terraform, Git, CI/CD.
• Implement Infrastructure as Code (IaC) for configuration and lifecycle management.
• Integrate workflows with Source of Truth (NetBox/Nautobot) and ITSM tools (ServiceNow).
• Develop reusable modules, playbooks, and pipelines for provisioning, upgrades, backups, and compliance.
• Use Python with network libraries (Netmiko, NAPALM, pyATS, etc. as a plus).
• Git & CI/CD: Comfortable with Git (branches, merge requests) and basic CI/CD pipelines.
• VDOM Design & Administration
• High Availability (HA) Deployment & Troubleshooting
• Observability: Experience with at least one monitoring stack (SolarWinds, Cisco DNAC, ThousandEyes, Prometheus/Grafana, Splunk/ELK, etc.).
• Protocols & Troubleshooting: Strong understanding of TCP/IP, DNS, DHCP, VPNs, QoS, and proven ability to troubleshoot complex network issues under pressure.
• Work closely with network architects, operations, SRE, and application teams to embed reliability by design.
• Contribute to network design reviews focusing on resilience, failure domains, capacity, and automation readiness.
• Create and maintain runbooks, playbooks, and documentation for ops teams.
• Mentor engineers on NetDevOps, automation, and reliability best practices.
• FortiGate Administration & Troubleshooting
• FortiAnalyzer Log Analysis & Reporting
• FortiAuthenticator (MFA, RADIUS, TACACS+)
• FortiOS Upgrades, Patching & Lifecycle Management