Sr Systems / Networking Engineer / Woodridge, IL / Onsite

$150000 - $175000 A rapidly growing, technology-focused trading firm is looking to add a hands‑on Systems Engineer to its infrastructure team in Woodridge, IL. This is a full‑time, onsite role centered on Linux systems, physical infrastructure, and network engineering, supporting a multi‑data‑center environment. The team operates close to the hardware, focusing on performance, reliability, and scalability rather than cloud‑first solutions. This is an opportunity to join a lean, evolving team where this role represents an expansion into deeper systems + networking capability. The environment is highly dynamic, with active infrastructure redesign efforts underway, particularly across networking. The ideal candidate is a mid‑level engineer who is strong in Linux systems, has exposure to networking, and wants to deepen their skillset in a trading or low‑latency environment. This is not a purely cloud or DevOps role, it’s built for someone who enjoys working directly with servers, switches, and system‑level optimization. Required Skills & Experience Strong hands‑on experience with Linux systems administration (production environments) Experience working with on‑prem / bare metal infrastructure (not cloud‑only) Solid understanding of networking fundamentals (routing, switching, troubleshooting) Experience operating in data center environments or with physical hardware Ability to troubleshoot both system and network layers Comfortable in fast‑paced, evolving environments Desired Skills & Experience Experience in trading, financial services, or low‑latency environments (strongly preferred) Exposure to Linux kernel‑level tuning or system optimization Hands‑on work with switches, routers, firewalls, or VPNs Experience with Ansible or similar automation tools Familiarity with multi‑data‑center infrastructure What You Will Be DoingTech Breakdown 65% Linux Systems (bare metal, performance tuning) 25% Networking (routing, switching, redesign support) 10% Windows / Microsoft ecosystem (M365, identity) Daily Responsibilities 70% Hands‑On Engineering (systems + infrastructure) 20% Project Work (network redesign, scaling initiatives) 10% Team Collaboration The Offer You will receive the following benefits: Competitive base salary Medical, Dental, and Vision InsurancePaid Vacation Time Opportunity to gain specialized experience in trading infrastructure Applicants must be authorized to work in the U.S. on a full‑time basis now and in the future. #J-18808-Ljbffr Kelly Services