Sr. Network Engineer

Target base salary range for Illinois candidates

• $140,000 to $155,000.

• Chicago-based hybrid role with a minimum of 3 days per week onsite.
• Participation in an on-call rotation and flexibility to support after-hours installs and incident response.
• Project-based travel may be required at times.

A top-tier global professional services organization with a long-established presence in Chicago and offices worldwide. The firm supports high-stakes client work across multiple time zones, which drives a premium on uptime, security, and operational discipline. Technology teams are expected to deliver stable, well-documented infrastructure and responsive support to demanding business users.

The Senior Network Engineer is a hands-on individual contributor responsible for designing, implementing, and supporting a global Cisco network environment. This role owns complex networking work across routing, switching, wireless, SD-WAN, load balancing, monitoring, and carrier circuits. The engineer partners closely with infrastructure, security, and third-party vendors to deliver reliable service and execute projects with strong documentation and change control.

• Design, implement, and support advanced enterprise networking across global sites.
• Configure and support Cisco routers, switches, Nexus platforms, and Cisco wireless infrastructure.
• Support SD-WAN and related routing, policies, and site connectivity (including Meraki SD-WAN).
• Operate and improve network monitoring and performance using tooling such as Cisco DNA, Thousand Eyes, and Solar Winds.
• Support and maintain load balancing infrastructure (F5), including troubleshooting and change implementation.
• Manage connectivity including internet, MPLS, point-to-point circuits, and cloud connectivity; coordinate implementations and escalations with telecom providers.
• Lead complex projects including new services, feature rollouts, office moves/build-outs, and hardware refresh cycles.
• Perform packet analysis and advanced troubleshooting using monitoring/capture tools to isolate and resolve escalations.
• Collaborate with IT Security on firewall-related needs and ensure alignment with security standards.
• Drive proactive capacity planning and performance improvements; present documented proposals and recommendations to leadership.
• Maintain accurate documentation, standards, and adherence to IT processes/controls to support high availability and business continuity.
• Participate in cross-functional initiatives, including non-network infrastructure projects as needed.

• 8+ years of enterprise networking experience with Cisco LAN/WAN environments.
• Advanced design and troubleshooting experience across complex network topologies.
• Deep knowledge of TCP/IP and core routing/switching concepts, including:
• L2/L3, LAN/WAN, wireless, network virtualization, WAN acceleration
• Strong hands-on experience with Cisco IOS, IOS-XE, Nexus, and Meraki SD-WAN.
• Strong experience supporting Cisco wireless in an enterprise environment.
• Experience with firewall/VPN infrastructure and working with security partners.
• Experience coordinating carrier circuits and managing telecom vendors/providers.
• Exposure to cloud services and connectivity (Azure and AWS).

• CCNA/CCNP or equivalent practical expertise.
• Network automation experience (Ansible and/or Python).
• F5 LTM/GTM experience.
• Cisco ISE and/or Infoblox DHCP/DNS experience.
• Packet broker / deep packet analysis tooling experience (plus Wireshark).
• Familiarity with next-gen network/security approaches (examples: ZTNA, SASE, DLP) in an enterprise context.
• Working knowledge of Linux and Windows administration.