Role Description Cybersecurity Incident Response Team (CIRT) Engineers at Lumen are on the front lines of protecting the systems that power global connectivity. In this role, you’ll respond to and mitigate cybersecurity threats while proactively identifying risks and strengthening our defenses. At Lumen, this work goes beyond incident response; it’s an opportunity to solve complex problems, influence how we defend at scale, and help shape the future of our security capabilities. You’ll collaborate with internal teams and partners to drive innovation, improve detection, and anticipate emerging threats in a fast-paced, high-accountability environment. If you’re motivated by challenging work, continuous learning, and the chance to make a real impact, this role offers the flexibility, trust, and support to help you grow while contributing to meaningful outcomes across our infrastructure and services. Location This is a remote position open to candidates based anywhere in the U.S. Main Responsibilities - Shift hours are from 10:00am to 7:00pm Pacific Time. Analyst can be located in any US state. - Respond to, remediate, and document information security incidents not limited to dashboard (Advanced Threat Appliance & SIEM) alerts, tickets, emails, or phone calls. - Actively hunt the enterprise for insecure, suspicious, or malicious activity. - Review data that is processed within the SIEM to find incident evidence and suspicious events as well as out of scope events. - Verify and validate security notifications from both internal and external sources. - Identify and resolve incidents that are not defined by (or deviate from) an existing incident response guide. - Assist with significant incidents as needed or assigned, including outside of normal business hours. - Provide feedback for development and consistency of automated threat detection mechanisms. - Update and maintain response guides for accuracy. - Support Security projects to improve Cyber Defense Team or Lumen's security posture. - Demonstrate effective communication skills, both verbal and written. Qualifications - Bachelor’s in Computer Science, Engineering, or related field (or equivalent experience). - Strong understanding of security fundamentals: host/network hardening, networking protocols, intrusion techniques, and risk management. - Analytical/problem-solving skills across networking, operating systems, and malware analysis. - Relevant certifications (or willingness to obtain): Security+, CEH, OSCP, GCIH, CISSP, GPEN, GWAPT, GISEC, CISM, or CISA. - U.S.-based and able to obtain government suitability. - Strong communication skills; able to present technical concepts to both technical and non-technical audiences. - Experience with cloud security (AWS, Azure, GCP). - Broad knowledge of current and emerging technologies. Preferred Qualifications - 4+ years in incident response, forensics, risk assessments, application or network security. - Experience in network/firewall engineering, design, and implementation. - Familiarity with security tools (SIEM, IDS/IPS, endpoint protection). - Experience monitoring threats and performing initial triage. - Microsoft or UNIX/Linux administration. - Experience implementing controls to reduce risk and data exposure. - Scripting experience (Python or Perl). - Experience in large enterprise or carrier-scale environments. Compensation This information reflects the anticipated base salary range for this position based on current national data. Minimums and maximums may vary based on location. Individual pay is based on skills, experience and other relevant factors. - $84,629 - $112,838 in these states: AL, AR, AZ, FL, GA, IA, ID, IN, KS, KY, LA, ME, MO, MS, MT, ND, NE, NM, OH, OK, PA, SC, SD, TN, UT, VT, WI, WV, WY. - $88,860 - $118,480 in these states: CO, HI, MI, MN, NC, NH, NV, OR, RI. - $93,092 - $124,122 in these states: AK, CA, CT, DC, DE, IL, MA, MD, NJ, NY, TX, VA, WA. Benefits - Lumen offers a comprehensive package featuring a broad range of Health, Life, Voluntary Lifestyle benefits and other perks that enhance your physical, mental, emotional and financial wellbeing.

• Design, execute, and lead end-to-end penetration tests across a wide range of environments • Conduct penetration testing across software-as-a-service and platform-as-a service environments • Perform AI and machine learning application security assessments • Simulate real-world adversarial attack scenarios • Conduct vulnerability assessments, threat modeling, and risk analysis • Develop and maintain custom exploits, scripts, and tooling • Perform social engineering, phishing simulations, and physical security assessments • Architect and build a comprehensive, scalable penetration testing program • Define penetration testing standards, methodologies, playbooks, and reporting templates • Establish key performance indicators and metrics for the program • Serve as the primary point of contact for all internal and external penetration testing engagements • Collaborate with Engineering, DevSecOps, IT, Risk, and Compliance teams • Manage relationships with third-party vendors • Present findings, risks, and remediation strategies to executive leadership

• Lead penetration testing engagements across web applications, APIs, and enterprise infrastructure • Perform advanced application security testing including business logic flaws and authentication weaknesses • Conduct internal and external network penetration testing • Lead Red Teaming engagements. • Perform threat modeling exercises (e.g., PASTA methodology) • Conduct cloud security assessments across AWS, Azure, and GCP • Perform mobile application security testing (Android and iOS) • Develop custom payloads and exploitation techniques • Produce detailed technical reports including proof-of-concept exploitation scenarios • Communicate technical findings and risk to client stakeholders • Mentor junior consultants during engagements • Contribute to internal research initiatives and security methodology improvements

• Define and own the architectural roadmap for Cerebras's enterprise, data center, and cloud network estate. • Co-author secure design and lifecycle management of high-performance data center networking — including spine/leaf, RDMA, and high-bandwidth fabrics supporting wafer-scale compute. • Build and maintain an AI-agent based analysis and review framework for network changes as well as self-improvement driven by observed network patterns and use cases. • Partner with Network Security to deliver segmented, zero-trust-aligned network designs across data center and corporate environments. • Set standards for resiliency, observability, and capacity planning across the global network • Mentor engineers across regions (US, Canada, Bangalore, and beyond), and serve as the senior technical voice on cross-functional network initiatives. • Stay ahead of emerging networking patterns relevant to AI infrastructure and translate them into actionable architecture decisions.