Principal Cybersecurity - Mobility Network Security Architect
Dallas, Texas
Job Description:
This position requires office presence of a minimum of 5 days per week and is only located in the location(s) posted. No relocation is offered.
Join AT&T and reimagine the communications and technologies that connect the world. Our Chief Security Office ensures that our assets are safeguarded through truthful transparency, enforce accountability and master cybersecurity to stay ahead of threats. Bring your bold ideas and fearless risk-taking to redefine connectivity and transform how the world shares stories and experiences that matter. When you step into a career with AT&T, you won’t just imagine the future-you’ll create it.
The mobility network security architect role with advanced Cybersecurity knowledge and specifically hands-on expertise in perimeter security, network segmentation, appliance hardening, mobile network security, PEN testing and vulnerability management of mobility network functions. This role will also apply broad business knowledge and strategic insights surrounding emerging trends and technologies to solve complex problems and drive organizational results. Will lead critical, high-impact projects and design/implements innovative business strategies. Will work with minimal oversight, frequently consulting senior leadership and influencing executive decisions and serves as a mentor and assists others with challenging issues.
- Mobility Network architecture – 3G to 5G, RAN, IMS, Diameter, SS7. GTP and securing the control plane and user plane.
- Building secure designs around 3GPP standards, roaming standards, lawful intercept, Netflow, TACACS (AAA).
- Can lead security assessments using NIST Cyber pillars. Work on architecture standards with labs and standards bodies.
- Appliance hardening. Good understanding of hardware and supply chain security.
- Capability to determine risks and introduce robust controls for wireless networks and IOT devices.
- Performs research on network vulnerabilities and perform RED team/fuzz testing to proactively determine security flaws (PSIRTs) on various network equipment from vendors such as: Nokia, Ericsson, Cisco and Juniper.
- Triage threat actor activities by evaluating - network devices/servers, perform forensics, TACACS/syslog, packet meta-data analysis etc.
Required Skills:
- 7+ years of progressive experience in cybersecurity.
- Hands on experience with red teaming & pen testing and will use this knowledge to test network hardware, software, and services.
- Experience with network security including incident management, cyber investigations, vulnerability remediation, red team exercises, network segmentation and AAA.
- Experience implementing security controls, policies and standards for core network that cover: Routing security, network compartmentalization etc., to reduce cyber risks and increase security controls to the core telecom network.
- Cyber security experience, education and/or certifications.
- Familiarity with large-scale Mobility networks, and advanced router functions.
- Knowledge of network security principles including control plane, data plane and element security. Familiarity with IP & 3GPP standards and protocols.
- Experience with technical discussions/negotiations with vendors.
- Experience working with development teams and providing guidance for lab proof of concept work and testing teams.
- Advanced knowledge of Linux.
- Mobility network elements such as: AMF, SMF, UPF, UDM, S-GW, P-GW, Control Plane, User Plane and vNF functions.
- BGP route controls and router protection techniques.
Secondary / Desired skills: SDN and network automation skills a major plus - Network scripting, Ansible, Linux, python.
Education/Experience:
Bachelor’s degree (BS/BA) desired in Computer Science or Cybersecurity. 7+ years of related experience. Certification is required in some areas.
Supervisor:
No
Our Principal Cybersecurity earns between $141,300-$211,900 USD Annual, not to mention all the other amazing rewards that working at AT&T offers. Individual starting salary within this range may depend on geography, experience, expertise, and education/training.
Joining our team comes with amazing perks and benefits:
- Medical/Dental/Vision coverage
- 401(k) plan
- Tuition reimbursement program
- Paid Time Off and Holidays (based on date of hire, at least 23 days of vacation each year and 9 company-designated holidays)
- Paid Parental Leave
- Paid Caregiver Leave
- Additional sick leave beyond what state and local law require may be available but is unprotected
- Adoption Reimbursement
- Disability Benefits (short term and long term)
- Life and Accidental Death Insurance
- Supplemental benefit programs: critical illness/accident hospital indemnity/group legal
- Employee Assistance Programs (EAP)
- Extensive employee wellness programs
- Employee discounts up to 50% off on eligible AT&T mobility plans and accessories,
- AT&T internet (and fiber where available) and AT&T phone.
#LI-Onsite – Full-time office role-
Ready to join our team? Apply today.
Weekly Hours:
40Time Type:
RegularLocation:
USA:NC:Charlotte / Research Dr - Dat:9139 Research DrSalary Range:
$141,300.00 - $237,400.00It is the policy of AT&T to provide equal employment opportunity (EEO) to all persons regardless of age, color, national origin, citizenship status, physical or mental disability, race, religion, creed, gender, sex, sexual orientation, gender identity and/or expression, genetic information, marital status, status with regard to public assistance, veteran status, or any other characteristic protected by federal, state or local law. In addition, AT&T will provide reasonable accommodations for qualified individuals with disabilities. AT&T is a fair chance employer and does not initiate a background check until an offer is made.
Job ID R-88996-3 Date posted 11/03/2025
Benefits
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- Paid Time Off
- Tuition Assistance
- Insurance Options
- Discounts
- Training & Development
Our hiring process
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