Senior Network Engineer

Nexzentek; Jersey City (NJ); On-site; USD 124,000 - 179,000; Part time

Job summary

Nexzentek in Jersey City, NJ is seeking a Senior Network Engineer for a multi-phase data center migration and network modernization project. This onsite role focuses on Cisco Catalyst 9300 deployments, Nexus 5K decommissioning, and Cisco ACI-integrated infrastructure migrations in a production environment.

The incumbent will perform cutovers, maintain Layer 2/3 connectivity, and support complex change-management processes across the data center network.

Qualifications

• 5+ years of hands-on network engineering experience.
• Expertise with Cisco Catalyst 9300 (CAT9K).
• Experience with enterprise switch refresh projects and migrations.
• Strong understanding of Layer 2/3 networking concepts and change management processes.

Responsibilities

• Upgrade Cisco Catalyst 9300 switches to IOS-XE releases.
• Apply standardized C9300 base configurations and templates.
• Migrate port configurations from legacy switches to Catalyst 9300 hardware.
• Perform onsite switch replacements and maintenance-window cutovers.
• Support migration from Nexus 5K to Catalyst 9300 infrastructure.
• Assist staging, validation and deployment of network hardware.
• Coordinate network migration activities tied to Change Requests.
• Support Cisco ACI-connected uplink migration activities.
• Troubleshoot connectivity issues during implementation and post-cutover validation.
• Document implementation activities and changes.

Skills

Cisco Catalyst 9300

Network Engineering

Layer 2/3 Networking

Change Management

Tools

IOS-XE

Cisco ACI

Nexus 5K

Data Center

Job description

Job Openings: 1

Experience: 6-15 Yrs

Published On: Aug 28, 2026, 05:51 pm

Job Description

Location: Jersey City, NJ Onsite

Overview:

We are seeking a highly skilled Senior Network Engineer to support a large-scale enterprise network modernization and data center migration initiative. This role will focus on Cisco Catalyst 9300 deployments, Cisco Nexus 5K decommissioning, network cutovers, and Cisco ACI-integrated infrastructure migrations within a production environment.

The ideal candidate is a hands-on engineer with deep experience in Cisco enterprise networking, switch migrations, maintenance-window implementations, and data center operations.

• Role Type: Contract / Project-Based
• Location: Jersey City, NJ Onsite (Data Center Environment)
• Duration: Multi-phase migration project
• Schedule: Must be available for maintenance windows and after-hours cutovers as required

Responsibilities

• Upgrade Cisco Catalyst 9300 switches to Cisco-recommended IOS-XE releases
• Apply standardized C9300 base configurations and templates
• Migrate existing port configurations from legacy switches to new Catalyst 9300 hardware
• Perform onsite switch replacements and execute maintenance-window cutovers
• Support migration of network connections from Cisco Nexus 5K environments to new Catalyst 9300 infrastructure
• Assist with staging, validation, and deployment of network hardware
• Coordinate and execute network migration activities tied to approved Change Requests (CRs)
• Support Cisco ACI-connected uplink migration activities
• Troubleshoot Layer 2 and Layer 3 connectivity issues during implementation and post-cutover validation
• Work closely with internal engineering teams to ensure successful deployment and minimal operational impact
• Document implementation activities, migration procedures, and technical changes

Required Qualifications

• 5+ years of hands-on network engineering experience
• Strong expertise with:
• Cisco Catalyst 9300 (CAT9K) switches
• Experience with:
• Enterprise switch refresh projects
• Network migrations and cutovers
• Configuration migration and deployment
• Maintenance-window implementations
• Strong understanding of Layer 2 and Layer 3 networking concepts
• Experience working within structured change management processes
• Ability to work onsite and support after-hours maintenance activities when required

Preferred Qualifications

• CCNP or CCIE certification
• Experience with Cisco FEX environments
• Experience supporting high-availability production networks

Skills

• Data Center

Work Location

Jersey City, New Jersey, New Jersey, United States