At T-Mobile, we invest in YOU! Our Total Rewards Package ensures that employees get the same big love we give our customers. All team members receive a competitive base salary and compensation package

• this is Total Rewards.

Employees enjoy multiple wealth-building opportunities through our annual stock grant, employee stock purchase plan, 401(k), and access to free, year-round money coaches. That's how we're

UNSTOPPABLE

for our employees! As a Principal Cybersecurity Engineer, you will be at the forefront of driving security initiatives within our Cyber Threat Intelligence (CTI) team! This role is critical for protecting T-Mobile data by owning the enterprise cryptographic key management capabilities that govern key lifecycle, cryptographic services, and post-quantum readiness. It involves designing and operating HSM-backed key management, application-level cryptographic integrations, PQC readiness, and Cryptographic Bill of Materials (CBOM) maintenance. The role collaborates with application, cloud, compliance, and Federal Solutions teams to integrate cryptographic services across enterprise and regulated environments. The work sustains regulatory obligations, protects regulated customer and federal subscriber data, and positions T-Mobile against post-quantum cryptographic threats. As the principal security advisor, you will collaborate closely with multi-functional teams to ensure the successful delivery of projects and services to our enterprise customers, providing invaluable insights and guidance to uphold the highest standards of security. Join us in shaping the future of cybersecurity and safeguarding our digital assets against emerging threats. Job Responsibilities Conducts security assessments, code reviews, and vulnerability testing to identify and mitigate risks Develops proactive security measures and strategies to enhance the security posture across various technologies Develops proactive security measures and strategies to enhance the security posture across various technologies Serves as an authority in cybersecurity, providing guidance and leadership to various business units Drives strategic security initiatives to protect against cyber threats and ensure compliance with security standards Evaluates new technologies and processes for potential security vulnerabilities and recommends corrective actions Mentor peers and junior team members, imparting expertise in security technologies, enterprise solution design, and effective customer interaction. With deep expertise in cryptographic architecture, act as an authority in enterprise cryptographic key management, including Thales Payshield payment HSMs, Luna general-purpose HSMs, post-quantum cryptography (PQC) readiness, Cryptographic Bill of Materials (CBOM), and

FIPS 140-2/140-3

compliance applicable to T-Mobile's enterprise and Federal Solutions environments. Education and 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.(reequired) 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(preferred) 7-10 years leading and collaborating with engineering teams to enhance security postures and strategic cybersecurity initiatives(preferred) Required Knowledge, Skills, and Abilities Domain expert in enterprise cryptographic key management, including Thales Payshield payment HSMs, Luna HSMs, key lifecycle operations, cryptographic integrations, and post-quantum cryptography readiness. Knowledge of federal & compliance regulations e.g.

SOX, PCI, CPNI, FIPS 140-2/140-3, CMMC

Level 2, and

NIST 800-171/172

Understanding of cryptographic platforms (ex

• Thales Payshield, Luna HSMs, CipherTrust Manager), load balancers (ex
• A10, F5), firewalls (ex
• CheckPoint), Venafi, MDM (ex
• Mobile Iron), Cloud (ex
• AWS, Azure), Malware Protection (ex
• FireEye), Advanced Persistent Threats (ex
• Damballa), Privileged Accounts (ex
• CyberArk), SIEM (ex
• ArcSight), Log & Event (ex
• Splunk), Intrusion IDS/IPS (ex
• Symantec), Cloud Platform (ex
• PCF, Docker), Scanning (ex
• Qualys), AppSec (ex
• Veracode) Experience with high level design architecture, security technologies, networking, web services and SOA.

Advance knowledge of Scripting tools (Python/Perl/Shell/HTML/PHP) Be an authority in multiple cybersecurity subject areas, information security and systems Knowledge of artificial intelligence (AI) and machine learning (ML) concepts, including their applications, benefits, risks, and impact on cybersecurity operations Excellent knowledge of threat modeling and escalation management Always act with integrity and collaborate with partners in a positive and productive manner Preferred Knowledge, Skills, and Abilities Proficient in operating Thales Payshield payment HSMs, including key ceremony execution, host command development, and PCI PIN, EMV, and P2PE cryptographic workflows. Experience with security tools such as SIEM, IDS/IPS, DLP, endpoint protection, and vulnerability scanners. Strong understanding of cloud security principles and standard processes (e.g., AWS, Azure, GCP). Familiarity with cryptographic platforms and standards (e.g., Thales CipherTrust, Luna Network HSMs, HashiCorp Vault, PKCS#11, KMIP) for enterprise key management and audit. Proficient in analyzing the cyber threat landscape to identify emerging threats, tactics, techniques, and procedures (TTPs) used by threat actors. Preferred Licenses and Certifications Certified Information Systems Security Professional (CISSP) Certified Information Security Manager (CISM) Certified in Risk & Informational Systems Control (CRISC) Thales Payshield or Luna HSM vendor certification At least 18 years of age Legally authorized to work in the United States T-Mobile requires U.S. citizenship for certain roles within the organization. This role requires U.S. citizenship. Individuals hired into this role will be required to submit documentation proving U.S. citizenship within the first 7 days of hire

• failure to do so will result in termination.

Travel :

Travel Required (Yes/No):

Yes DOT Regulated :

DOT Regulated Position (Yes/No):

No Safety Sensitive Position (Yes/No):

No Base Pay Range:

$127,800

• $230,700

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.