Senior Principal Architect, Cyber Defense Engineering

Role Overview and Core Responsibilities

This is a hybrid position and involves regular performance of job responsibilities virtually as well as in-person at an assigned TU office location for a minimum of two days a week. Reporting the SVP, Cyber Defense Engineering, this role will partner closely with the AI SOC, VulnOps, Detection Engineering, and Technical Program Manager functions to ensure architectural coherence as Cyber Defense shifts from fragmented, tool‑centric operations to a unified, automation‑first, agentic security architecture. Own and evolve the Cyber Defense reference architecture, defining the target‑state design for how detection, response, vulnerability management, and endpoint telemetry integrate across a unified data and automation layer. Architect TransUnion's Data Security Posture Management (DSPM) capability, leading technical evaluation, integration design, and rollout planning for cloud‑native data discovery, classification, and exposure detection, including Wiz DSPM, across AWS, GCP, and hybrid environments. Define TransUnion's Zero Trust Network Access (ZTNA) architecture, establishing target‑state design for identity‑aware, least‑privilege access to enterprise and cloud workloads in coordination with IAM, network security, and cloud infrastructure teams. Own Endpoint Strategy architecture, defining the target design for endpoint detection and response, exposure management, and telemetry integration across the enterprise fleet while rationalizing overlapping endpoint tooling. Architect the AI enablement layer for Cyber Defense, designing agentic and LLM‑based capabilities for triage, investigation, and response, including MCP‑based agent orchestration and AI SOC platforms that integrate with existing SIEM, SOAR, and case management systems. Lead the technical architecture for SIEM and security data platform modernization, defining the target design for log ingestion, retention, and analytics as the organization evaluates consolidation of fragmented logging and detection platforms. Define reference architecture for the VulnOps operating model, ensuring vulnerability discovery, prioritization, disruption, and remediation systems integrate cleanly with the broader Cyber Defense data and automation architecture. Evaluate emerging security technologies and vendor platforms against TransUnion's architecture principles, producing build‑versus‑buy recommendations, integration designs, and proof‑of‑concept plans for new capabilities before they reach production. Establish architecture governance and design standards for Cyber Defense Engineering, authoring reference diagrams, integration patterns, and technical design documents that guide engineering teams building against the architecture.