Sr. Network Administrator


CrossRealms is a fast-growing Chicago-based IT Managed Services and solutions provider comprised of certified expert consultants, engineers, and business team members. We specialize in designing customized, enterprise-class solutions that are comprehensive, resilient, and scalable. Through our technology expertise and proven track record of transformative results for companies large and small, we aim to build long-term relationships and are committed to meeting and exceeding client needs. Our services and solutions are in use by a wide variety of industries, including legal, manufacturing, healthcare, and more.

We are currently seeking a Sr. Network Administrator for one of our clients based in downtown Chicago.

Job Type:
Onsite initially/Hybrid eventually – Chicago based applicants please
M-F 8:00am – 5:00 pm
Direct Hire
$90,000 annual salary plus bonus

Position Overview:
Senior Network Administrator is to design, implement, manage, and maintain company’s enterprise grade network infrastructure. The Sr. Network Administrator must be well versed with the advanced engineering and administration of multiprotocol devices, multilayer switches, network security devices and network management systems. The job requires extensive hands-on experience with enterprise class networks coupled with some managerial and project management skills. Invenergy network is consists of Cisco, Palo Alto, Sonic, Aruba and Ruckus networking devices. WAN connectivity is via IPSec, MPLS and/or Azure Infrastructure.


  • Manage network infrastructure consists of Palo Alto, Cisco, Sonic, and Aruba devices
  • Help improving LAN\WAN\WLAN architecture for maximum performance, capacity, and scalability
  • Implement appropriate network management and monitoring systems achieving zero downtime
  • Install and configure firewalls, switches, wireless and other networking devices
  • Automate repetitive networking tasks and monitor their effectiveness
  • Implement network security measures per business requirements
  • Conducting network performance and integrity tests; generate reports
  • Help developing and implementing network disaster recovery plans
  • Timely resolve escalated network related support issues
  • Develop and maintain complete technical documentation
  • Interact with business partners providing network engineering support
  • Ability to execute multiple projects, meeting hard deadlines



  • Bachelor’s degree in Computer Science, Information Technology, or related field
  • At least 5 years of networking experience in an enterprise networking environment
  • Advanced working knowledge of Cisco Catalyst and Nexus switches
  • Exceptional hands-on experience with Palo Alto firewalls
  • Considerable experience implementing WAN solutions such as MPLS, SD-WAN, etc.
  • Experience with communication and routing protocols such an BGP, EIGRP, and OSPF
  • Familiarity with network monitoring and analysis tools like PRTG and SolarWinds
  • Hands-on experience with cloud solutions such as Azure and AWS
  • Excellent leadership and time management skills

Job Type: Fulltime 
Salary: $90,000


  • 401(k)
  • Dental insurance
  • Health insurance
  • Paid time off
  • Vision insurance


  • 8 hour shift
  • Monday to Friday
  • Supplemental Pay:
  • Bonus pay
Job Category: Technology
Job Type: Full Time
Job Location: Chicago (onsite – Chicagoland based applicants only)

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Usama Houlia - CEO

Usama Houlila

President and Enterprise Architect
Usama Houlila is an Enterprise Architect with more than 20 years of professional experience providing technology solutions for organizations in industries including legal, public services, healthcare, finance, retail, hospitality, and manufacturing. Usama is well-versed in all phases of project delivery – from initiation to closeout. His ability to see the big picture is a product of his comprehensive knowledge of hardware, software, application, and systems engineering. Usama’s myriad interests include international affairs, nutrition and health, cooking, and music. He has played the flute since childhood and is an avid runner and bicyclist who recently added swimming and triathlons to the mix. He currently manages, designs, and deploys palo alto for legal, healthcare, and financial services.