Principal Cybersecurity Engineer, Telco

Job Overview

Safeguard critical telecommunications technologies, including 3GPP standards, IMS, packet core, messaging, e911, and 5G networks, while applying modern security practices such as zero‑trust architecture, containerization, and advanced threat detection. The engineer collaborates with cross‑functional teams to assess and mitigate risks, ensuring a secure environment for enterprise applications, IoT, mobile devices, and next‑generation networks. Success is measured by the effectiveness of security controls and the reduction of vulnerabilities.

Job Responsibilities

• Conduct security assessments, code reviews, and vulnerability testing to identify and mitigate risks.
• Develop proactive security measures and strategies to enhance the security posture across various technologies.
• Collaborate with engineering teams to integrate security practices into software development and deployment processes.
• Serve as a subject matter expert in cybersecurity, providing guidance and leadership to business units.
• Ensure the security of 3GPP‑compliant systems, including LTE, 5G, and IMS core networks.
• Evaluate new technologies and processes for potential security vulnerabilities and recommend corrective actions.
• Develop and implement cybersecurity solutions for packet core infrastructure, including EPC, UPF, and related network elements.
• Drive strategic security initiatives to protect against cyber threats and ensure compliance with security standards.
• Lead security design and implementation for critical services such as e911, VoLTE, RCS messaging, and SMS/MMS platforms.
• Secure signaling protocols (e.g., Diameter, SIP, HTTP/2) and mitigate risks such as signaling fraud, DoS attacks, and SS7 vulnerabilities.
• Perform additional duties or projects as assigned by business management.

Education and Work Experience

• Bachelor's Degree plus 7 years of related work experience OR Advanced degree with 5 years of related experience (Required).
• Acceptable areas of study include Computer Science or Information Technology (Required).
• 7–10 years conducting security assessments and vulnerability testing to identify and mitigate risks in digital environments (Preferred).
• 7–10 years developing and implementing cybersecurity measures across various technologies including mobile and IoT devices, cloud services, and network technologies, e911, VoLTE, IMS Core and RAN (Preferred).
• 7–10 years leading and collaborating with engineering teams to enhance security postures and strategic cybersecurity initiatives (Preferred).

Knowledge, Skills and Abilities

• Proven expertise in 3GPP standards, 5G architecture, IMS core, and packet core security.
• Artificial Intelligence (AI).
• Cybersecurity.
• Escalation Management.
• Security Automation.
• Security Engineering.
• Security Incident Management.
• Stakeholder Management.
• Threat Modeling.

Licenses and Certifications

• Certified Information Systems Security Professional (CISSP) – preferred.
• Certified Information Security Manager (CISM) – preferred.
• Certified in Risk & Information Systems Control (CRISC) – preferred.

Legal and Eligibility Requirements

• At least 18 years of age.
• Legally authorized to work in the United States.

Travel

Travel Required: No

Compensation

Base Pay Range: $127,800 – $230,700 Corporate Bonus Target: 20%. Location‑specific ranges: Bellevue, WA: $166,300 to $224,900; Frisco, TX: $147,700 to $199,900; Overland Park, KS: $139,200 to $188,400. Actual starting pay will vary within the range based on location, qualifications, and experience.

Benefits

• Medical, dental, and vision insurance.
• Flexible spending account.
• 401(k) with company match.
• Employee stock grants and purchase plan.
• Paid time off and paid holidays.
• Paid parental and family leave.
• Childcare subsidy and tuition assistance.
• Short‑ and long‑term disability coverage.
• Volunteer accident, life, disability and long‑term care coverage.
• Mobile service & home internet discounts.
• Pet insurance.
• Commuter and transit program access.

EEO Statement

T‑Mobile USA, Inc. is an Equal Opportunity Employer. All decisions concerning the employment relationship are made without regard to age, race, ethnicity, color, religion, creed, sex, sexual orientation, gender identity or expression, national origin, religious affiliation, marital status, citizenship status, veteran status, the presence of any physical or mental disability, or any other status or characteristic protected by federal, state, or local law. Discrimination, retaliation or harassment based on any of these factors is wholly inconsistent with how we do business and will not be tolerated.

For accommodation needs, contact ‑mobile.com or call 1‑844‑873‑9500. This channel is not a means to apply for or inquire about a position and we are unable to respond to non‑accommodation related requests.