What are the responsibilities and job description for the Principal Engineer, Cyber Security position at T-Mobile?

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Job Overview

The Principal Cybersecurity Engineer ensures the design, implementation, and management of robust security systems and practices across diverse software, systems, and infrastructure. 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.

As a subject matter expert, this role drives cybersecurity strategies across cloud, big data, carrier network technologies, and other emerging areas, providing technical leadership and enhancing the organization's security posture.

Job Responsibilities :

Telecom Security :

Ensures the security of 3GPP-compliant systems, including LTE, 5G, and IMS core networks.

Develops and implements cybersecurity solutions for packet core infrastructure, including EPC, UPF, and related network elements.

Leads security design and implementation for critical services like e911, VoLTE, RCS messaging, and SMS / MMS platforms.

Secures signaling protocols (e.g., Diameter, SIP, HTTP / 2) and mitigates risks such as signaling fraud, DoS attacks, and SS7 vulnerabilities.

Advanced Threat Management :

Develops and executes threat modeling approaches (e.g., STRIDE, ATT&CK, Cyber Kill Chain) for telecom technologies and services.

Designs and deploys advanced EDR / XDR solutions to protect against sophisticated threats targeting telecom infrastructure.

Next-Generation Networks and Cloud :

Secures 5G standalone and non-standalone architectures, ensuring integrity and confidentiality across gNBs, MEC, and NFs.

Improves cloud-native security in 5G core and IMS environments leveraging Red Hat Openshift, Kubernetes, service meshes (Istio), and microservices.

Collaborates with teams on the implementation of secure MEC (Multi-access Edge Computing) environments and 5G slicing security.

Expertise on cloud native security technologies in AWS, Azure, GCP etc.

Proficiency in Cloud security architecture and deployment.

Software defined network architecture and deployment in large scale enterprise using Cisco ACI and Terraform.

Modern authentication stack experience on Microsoft Entra ID, CyberArk, Hashicorp, Keyfactor, certificate management etc.

Experience on firewalls (Checkpoint, PAN), load balancers (A10, F5, Avi), micro-segmentation tools (Illumio), SASE products like Zscaler is desired.

Incident Response and Risk Management :

Leads investigations and response efforts for telecom-specific security incidents, ensuring compliance with standards and regulations.

Proactively identifies security gaps in legacy and modern telecom infrastructure, developing and implementing risk mitigation strategies.

Cross-Functional Collaboration :

Acts as a cybersecurity advisor for engineering teams, ensuring secure SDLC practices for telecom and enterprise applications.

Mentors teams on telecom cybersecurity, fostering expertise in signaling security, secure protocol design, and network hardening.

Modern Cybersecurity Technologies :

Implements and manages solutions for zero-trust architecture, AppSec, and DevSecOps within telecom systems.

Automates threat detection and response pipelines using Python, Bash, or PowerShell integrated with tools like Splunk or Elastic Stack.

Optimizes cross-functional partnership to successfully address customer requirements. Leads / coordinates large scale analysis efforts spanning multiple departments. Uses internal and external data resources to make strategic business decisions and persuade others. Collaborates and builds long-term relationships with key partners. Anticipates likely customer responses to specific recommendations and can address accordingly.

Leads information security review of new technologies, designs, and remediation planning efforts.

Collaborates with Engineering & Operations Teams to address security vulnerabilities found via PSIRTs, scans or breaches.

Proactively identifies process or technology improvements within existing legacy applications or infrastructure and seeks out remediation.

Investigates and / or leads identifying security needs & recommends plans / resolutions. Implements, tests & monitors info security improvements.

Maintains transparency inside & outside of information security at the Executive (Director / Sr Director) level. Collaborates with groups such as application support, engineering ops, finance, privacy, risk management, etc.

Significant experience with the analysis of underlying technologies that form the solution vital for the application of threat identification, analysis, and thread model design. The threat model depicts trust boundary, threat agent(s), threat vector(s), and safeguard(s) vital to protect person, asset, data, and T-Mobile brand.

Proactively identifies areas that need to be developed and seeks out expertise in those areas. Keeps abreast of current developments and trends and can use this knowledge to create a business case to address major issues and build specific action plans to address the gaps that the team controls. Plays a leadership role in the execution of that action plan.

Leads security projects driven by groups to info security.

Mentors, peers and junior team members in security technologies, enterprise solution design, SDLC facilitation and effective customer interaction.

Significant experience with implementation of various threat modeling approaches pertaining to one or more of the following STRIDE, PASTA, TRIKE, ATTACK TREE, DREAD, KILL CHAIN, CAPEC, Mobile Application threat model, Cyber Threat Tree, and data flow diagram.

Subject matter expert in multiple facets of network & information security, including Firewall policy design, SSL Certificate management, vulnerability analysis & mitigation, and other topics as assigned.

Advanced understanding of IP / Security solutions & technologies applicable to the Wireless Network Architecture.

Also responsible for other Duties / Projects as assigned by business management as needed.

Qualifications : Education :

Bachelor's Degree, Computer Science, or Information Technology. Equivalent experience in lieu of degree might be considered.

Experience :

7-10 years’ Experience with growing responsibility with security related software and / or business process design (Required)

4-7 years’ Experience with the following : project / team lead, formal implementation SDLC, facilitation of cross-functional solution design teams.

4-7 years’ Technical Project Management.

Previous Leadership experience.

Proven expertise in 3GPP standards, 5G architecture, IMS core, and packet core security.

Experience securing telecom applications like e911, VoLTE, and messaging systems.

Solid understanding of cloud security, containerization, and modern DevSecOps practices.

Knowledge, Skills, and Abilities :

Solid understanding of telecom-specific protocols and technologies, including :

Diameter, SIP, HTTP / 2, SS7, SCTP, and GTP security.

Core network elements (e.g., MME, PGW, SGW, AMF, SMF, UPF).

IMS core components (e.g., P-CSCF, S-CSCF, I-CSCF).

Expertise in next-generation telecom security :

5G standalone and non-standalone architectures, MEC, and network slicing.

Threats targeting 5G networks and mitigation strategies.

Proficiency in scripting and automation for security operations (e.g., Python, Ansible, Terraform).

Advanced knowledge of security tools and platforms, such as EDR / XDR, SIEM (Splunk, Sentinel), and AppSec tools (e.g., Gitlab, Azure DevOps).

In-depth knowledge of regulatory compliance standards (e.g., NIST, FCC e911, PCI-DSS).

License / Certification (Preferred) :

Certified Information Systems Security Professional (CISSP).

Telecom-specific certifications (e.g., Nokia SRC, Ericsson ECSA, 5G-Security).

At least 18 years of age

Legally authorized to work in the United States

Travel :

Travel Required (Yes / No) : Yes

DOT Regulated :

DOT Regulated Position (Yes / No) : No

Safety Sensitive Position (Yes / No) : No

Base Pay Range : $121,800 - $219,700

Corporate Bonus Target : 20%

The pay range above is the general base pay range for a successful candidate in the role. The successful candidate’s actual pay will be based on various factors, such as work location, qualifications, and experience, so the actual starting pay will vary within this range.

At T-Mobile, employees in regular, non-temporary roles are eligible for an annual bonus or periodic sales incentive or bonus, based on their role. Most Corporate employees are eligible for a year-end bonus based on company and / or individual performance and which is set at a percentage of the employee’s eligible earnings in the prior year. Certain positions in Customer Care are eligible for monthly bonuses based on individual and / or team performance. To find the pay range for this role based on hiring location, click here .

At T-Mobile, our benefits exemplify the spirit of One Team, Together! A big part of how we care for one another is working to ensure our benefits evolve to meet the needs of our team members. Full and part-time employees have access to the same benefits when eligible. We cover all of the bases, offering medical, dental and vision insurance, a flexible spending account, 401(k), employee stock grants, employee stock purchase plan, paid time off and up to 12 paid holidays - which total about 4 weeks for new full-time employees and about 2.5 weeks for new part-time employees annually - paid parental and family leave, family building benefits, back-up care, enhanced family support, childcare subsidy, tuition assistance, college coaching, short- and long-term disability, voluntary AD&D coverage, voluntary accident coverage, voluntary life insurance, voluntary disability insurance, and voluntary long-term care insurance. We don't stop there - eligible employees can also receive mobile service & home internet discounts, pet insurance, and access to commuter and transit programs! To learn about T-Mobile’s amazing benefits, check out www.t-mobilebenefits.com .

Never stop growing!

As part of the T-Mobile team, you know the Un-carrier doesn’t have a corporate ladder–it’s more like a jungle gym of possibilities! We love helping our employees grow in their careers, because it’s that shared drive to aim high that drives our business and our culture forward. By applying for this career opportunity, you’re living our values while investing in your career growth–and we applaud it. You’re unstoppable!

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.

Talent comes in all forms at the Un-carrier. 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 ApplicantAccommodation@t-mobile.com or calling 1-844-873-9500 . 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.

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Salary : $121,800 - $219,700

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