Senior Network Security Engineer — Lead, Automate & Defend

Relativity; Chicago (IL); Hybrid; USD 130,000 - 195,000; Full time

Job summary

Relativity is seeking a Senior Security Engineer focused on Network Security. You will design and deploy network security controls across on-prem, cloud, and hybrid environments, integrating telemetry into SIEM and automated workflows.

The role emphasizes threat hunting, purple-team testing, and AI-enabled SecOps capabilities while mentoring junior engineers. You will collaborate with Infrastructure, Cloud, and Engineering teams to strengthen segmentation, access, and resilience, driving

Qualifications

• 4-8 years of hands-on experience in enterprise security engineering with focus on network security.
• Experience with EDR/XDR, SIEM, CNAPP, CSPM, and cloud/network security controls.
• Ability to write automation scripts and rules for security enforcement.
• Familiarity with MITRE, NIST frameworks.
• Experience mentoring engineers.

Responsibilities

• Lead design, deployment, and optimization of network security controls across on-prem, cloud, and hybrid environments.
• Develop detections and investigations for C2, lateral movement, and data exfiltration.
• Automate network security configuration via APIs, scripting, IaC, and policy-as-code.
• Partner with IT, Cloud and Engineering teams on secure connectivity and remediation.
• Lead purple-team exercises and validate control efficacy.
• Mentor junior engineers and produce runbooks and knowledge artifacts.

Skills

Python

Scripting/Automation

Communication

Mentorship

Security architecture

Education

Bachelor's in Computer Science

Bachelor's in Information Security

Tools

EDR

XDR

SIEM

CNAPP

CSPM

CWP

ZTNA

Job description

Relativity is seeking a Senior Security Engineer focused on Network Security. You will design and deploy network security controls across on-prem, cloud, and hybrid environments, integrating telemetry into SIEM and automated workflows.

The role emphasizes threat hunting, purple-team testing, and AI-enabled SecOps capabilities while mentoring junior engineers. You will collaborate with Infrastructure, Cloud, and Engineering teams to strengthen segmentation, access, and resilience, driving