Principal Engineer, Cyber Security

T-Mobile US-posted about 1 year ago
Full-time • Principal
Bellevue, WA
Telecommunications
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The Principal Cybersecurity Engineer at T-Mobile is responsible for designing, implementing, and managing robust security systems across various telecommunications technologies. This role focuses on securing critical systems such as 3GPP standards, IMS, packet core, messaging, e911, and 5G networks. The engineer will leverage modern practices like zero-trust architecture and advanced threat detection while collaborating with cross-functional teams to assess and mitigate risks, ensuring a secure environment for enterprise applications and next-generation networks.

  • 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.
  • 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.
  • 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.
  • Provides expertise on cloud-native security technologies in AWS, Azure, GCP, etc.
  • Demonstrates proficiency in cloud security architecture and deployment.
  • Implements software-defined network architecture and deployment in large-scale enterprise using Cisco ACI and Terraform.
  • Utilizes modern authentication stack experience on Microsoft Entra ID, CyberArk, Hashicorp, Keyfactor, and certificate management.
  • Handles firewalls (Checkpoint, PAN), load balancers (A10, F5, Avi), micro-segmentation tools (Illumio), and SASE products like Zscaler.
  • 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.
  • 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.
  • Implements and manages solutions for zero-trust architecture, AppSec, and DevSecOps within telecom systems.
  • Automates threat detection and response pipelines using Python.
  • Extensive experience in cybersecurity within telecommunications, particularly with 3GPP standards and telecom infrastructure.
  • Strong knowledge of security design and implementation for packet core networks and critical telecom services.
  • Experience with advanced threat management and incident response in telecom environments.
  • Proficiency in cloud-native security technologies and architectures, particularly in 5G and IMS environments.
  • Familiarity with modern authentication technologies and security tools such as firewalls and load balancers.
  • Experience with micro-segmentation tools and SASE products.
  • Knowledge of secure SDLC practices and mentoring experience in cybersecurity.
  • Familiarity with automation tools and scripting, particularly in Python.
  • Competitive base salary and compensation package.
  • Annual stock grant and employee stock purchase plan.
  • 401(k) with wealth-building opportunities.
  • Access to free, year-round money coaches.
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