The Cybersecurity Engineer will help ensure that our software, systems and infrastructure are designed and implemented to the highest security standards. Performs technical security assessments, code reviews and vulnerability testing to highlight risk and remediate associated findings while helping T-Mobile teams and partners improve security. Works closely with other T-Mobile Engineers to design and build proactive methods to enhance our security posture, with a focus on building these methods through automation and AI. Collaborate with Engineering & Operations Teams to address security vulnerabilities found via PSIRTs, scans or breaches. Also, drive and support network security best practices. Leads the technical implementation of the AI Security program and serves as the engineering point for secure-by-design AI adoption across the enterprise. Owns the AI intake/security review process, threat modeling, and translation of policy into enforceable controls for SaaS AI, GenAI/LLM, and internal AI services. Converts Proof‑of‑Value outcomes for AI and Data Security solutions into production controls; integrates telemetry with SIEM/SOAR and ITSM/CMDB for operations and auditability. Partners with Data Protection, the Cybersecurity Syndicate, Legal/Privacy, Procurement/Vendor Risk, and platform/application teams. Mentors engineers, publishes standards/guardrails (logging, purpose‑binding, kill‑switch, secrets handling), and drives measurable outcomes (coverage, enforcement, MTTR, approval SLA, false‑positive rates).