Infrastructure Engineer

Northstrat•Sterling, VA

6h•Hybrid

About The Position

Northstrat is seeking a highly skilled Infrastructure Engineer to design, implement, secure, and maintain our enterprise infrastructure. This role combines advanced Cisco networking and security expertise with strong Linux systems administration experience. The ideal candidate will be hands-on, security-focused, and comfortable operating in a hybrid on-premises and cloud environment.

Requirements

Must have a current and active DoD TS/SCI clearance
CompTIA Security+ (or equivalent) or better is required
At least 5+ years of experience in network engineering and systems administration
Strong hands-on experience with Cisco networking equipment is required
Experience with Cisco ASA or Firepower security appliances
Must have a deep understanding of TCP/IP, subnetting, routing, and switching
Strong Linux administration experience in production environments
Experience with virtualization platforms
Knowledge of network security principles and best practices
Ability to troubleshoot across network and system layers

Nice To Haves

Cisco Certified Network Associate (CCNA) or better
Experience with configuration management tools (Ansible, Puppet)
Experience with monitoring tools (SolarWinds, Nagios, Zabbix)
Familiarity with cloud platforms (AWS, Azure, GCP)
Scripting experience (Python, Bash)

Responsibilities

Design, deploy, and maintain enterprise network infrastructure
Configure and support: Cisco routers and switches, Cisco ASA and/or Firepower firewalls, Cisco ISE (Identity Services Engine)
Manage VLANs, routing protocols (BGP, EIGRP), and switching technologies
Implement and maintain site-to-site and remote access VPNs
Maintain network segmentation and security controls
Perform firmware upgrades, patching, and lifecycle management
Monitor network health and performance using SNMP and other tools
Troubleshoot complex Layer 2/3 connectivity issues
Implement and enforce network security best practices
Maintain firewall policies and intrusion prevention system
Install, configure, and maintain Linux servers (RHEL, CentOS, Ubuntu)
Manage system services, patching, and updates
Automate tasks using Bash, Python, or Ansible
Manage system backups and disaster recovery procedures
Monitor system performance and troubleshoot production issues