Lead Data Loss Prevention (DLP) Security Engineer

Responsibilities

• Own the enterprise DLP architecture and roadmap using Microsoft Purview across Exchange Online, SharePoint Online, OneDrive, Teams, Power BI, and Endpoint DLP on managed devices.
• Design and implement data classification and labeling at scale (sensitivity labels, automatic / manual labeling, protection actions) aligned to the organization’s data taxonomy.
• Build, test, and tune DLP policies for high‑risk exfiltration vectors (email, cloud storage, chat, web uploads, endpoints : removable media, print, clipboard, Bluetooth, RDP, browser downloads).
• Stand up and mature advanced classifiers and detections (Sensitive Information Types, Exact Data Match schemas, trainable classifiers) with continuous improvement cycles.
• Integrate DLP with incident management and SOC workflows (alert triage, case management, evidence capture, automation) and with SIEM (e.g., Microsoft Sentinel) using KQL analytics.
• Partner with Identity, Endpoint, and Collaboration teams to enforce device / user trust prerequisites, and with Compliance / Legal on retention, eDiscovery, and privacy-by-design.
• Create enablement content : policy tips, just‑in‑time guidance, and training for end users and privileged administrators to reduce friction and false positives.
• Establish exception and change management processes, including time‑bound exceptions with compensating controls and periodic recertification.
• Publish dashboards and KPIs to leadership (coverage, alert volumes, true‑positive rates, MTTR, prevented exfiltration, policy drift).
• Mentor junior engineers and act as the primary subject‑matter expert for Microsoft Purview DLP.

Basic Qualifications

Preferred Qualifications and Skills

What’s in it for You

When you join CoStar Group, you’ll experience a collaborative and innovative culture working alongside the best and brightest to empower our people and customers to succeed.

We offer you generous compensation and performance-based incentives. CoStar Group also invests in your professional and academic growth with internal training, and tuition reimbursement.

Our benefits package includes (but is not limited to) :