Principal Cybersecurity Engineer, Telco

Job Overview

This role involves securing critical telecommunications technologies, including 3GPP standards, IMS, packet core, messaging, e911, and 5G networks, while leveraging modern practices like 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. The role works with engineering teams to implement security measures for technologies including mobile devices, cloud services, and networks. Success is measured by the effectiveness of security controls and the reduction of vulnerabilities. The work enhances organizational resilience against cyber threats and safeguards critical business operations and customer data.

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 various 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 like 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
• Also responsible for other duties/projects as assigned by business management as needed

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

Knowledge, Skills and Abilities

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

Licenses and Certifications

• Certified Information Systems Security Professional (CISSP) – an advanced-level certification for IT professionals serious about careers in information security (Preferred)
• Certified Information Security Manager (CISM) – offered by ISACA, for management-focused IT professionals who manage, design, oversee, and assess an enterprise’s information security (Preferred)
• Certified in Risk & Information Systems Control (CRISC) – offered by ISACA, for IT professionals, project managers, and others whose job is to identify and manage risks to IT and the business (Preferred)

Travel

Travel required: No

DOT Regulated

DOT regulated position: No
Safety sensitive position: No

Compensation Range

Bellevue, WA: $166,300 to $224,900

Frisco, TX: $147,700 to $199,900

Overland Park, KS: $139,200 to $188,400

Base Pay Range: $127,800 – $230,700

Corporate Bonus Target: 20%

Equal Opportunity Employer Statement

T-Mobile USA, Inc. is an Equal Opportunity Employer. All decisions concerning the employment relationship will be 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 upon any of these factors is wholly inconsistent with how we do business and will not be tolerated.

Reasonable Accommodation

If you are an individual with a disability and need reasonable accommodation at any point in the application or interview process, please let us know by emailing or calling . Please note, this contact channel is not a means to apply for or inquire about a position and we are unable to respond to non‑accommodation related requests.