Sr. Network Engineer

Liberty Personnel Services, Inc.; Philadelphia (Philadelphia County); Hybrid; USD 120,000 - 160,000; Full time

Job summary

Liberty Personnel Services, Inc. is seeking a Sr. Network Engineer for a full-time hybrid role based in Philadelphia.

The position requires hands-on enterprise networking experience, ownership of routing, switching, firewall, and cloud connectivity across multiple sites and cloud environments. The ideal candidate will lead complex network projects, provide Tier 3 support, mentor junior staff, and communicate technical details to both technical and non-technical stakeholders.

Qualifications

• 7+ years of enterprise network engineering experience.
• Experience with multi-vendor environments.
• Strong troubleshooting and communication skills.

Responsibilities

• Design, implement, manage, monitor and troubleshoot enterprise network infrastructure.
• Own routing, switching, firewall, NAC, load balancing, WAN, and hybrid cloud networking environments.
• Lead complex network implementations, upgrades and migrations from planning through validation.
• Provide Tier 3 troubleshooting and root-cause analysis for critical issues.

Skills

Senior networking

Multi-vendor

Network design

Communication

Tools

Cisco ASA/Firepower

Fortinet FortiGate

Cisco ISE

F5 BIG-IP

Palo Alto familiarity

Job description

My client has a full time opening for aSr. Network Engineer. This is a hybrid role in Philly and is on site T, W and Th. You must be a Citizen or GC holder to qualify. Role will involve the following:

• Senior-level, hands-on network engineering role responsible for designing, implementing, managing, monitoring, and troubleshooting enterprise network infrastructure across a globally distributed organization.
• Owns routing, switching, firewall, network access control, load balancing, WAN connectivity, and hybrid cloud networking environments.
• Leads complex network implementations, upgrades, migrations, and infrastructure projects from planning through post-implementation validation.
• Provides Tier 3 troubleshooting, root-cause analysis, and escalation support for critical network and security issues.
• Designs and supports highly available, redundant, multi-site network environments using BGP, OSPF, and EIGRP.
• Manages enterprise security platforms including Cisco ASA/Firepower, Fortinet FortiGate, Cisco ISE, and F5 BIG-IP, with familiarity with Palo Alto Networks valued.
• Integrates on-premises infrastructure with AWS, Azure, and/or GCP cloud environments, including hybrid routing, VPN, and connectivity solutions.
• Works directly with internal stakeholders and external clients to resolve connectivity issues and communicate technical information clearly to both technical and non-technical audiences.
• Manages multiple concurrent projects and operational priorities while maintaining network reliability, security, and service quality.
• Provides technical guidance and mentorship to junior team members and contributes to network standards, documentation, and long-term infrastructure improvements.
• Requires 7+ years of enterprise network engineering experience, strong multi-vendor expertise, and excellent communication and problem-solving skills.