Endpoint Security Engineer

Job Type

Full- Time

Workplace Type

Remote in the areas of Morrisville, NC or Falls Church, VA

Clearance: Public Trust

Must be a U.S. Citizen

Benefits

Medical, dental, and vision coverage, 401k matching, generous PTO, paid holidays, professional training opportunities, and even pet insurance to ensure your furry friends are cared for too.

Job Summary

Castalia Systems is seeking an Endpoint Security Engineer to support our Intelligence Client’s mission sets. As an Endpoint Security Engineer you will design, deploy, and operationalize active, behavior-based endpoint detection and response (EDR/XDR) capabilities across one of the largest private operational fleets in North America. Protecting an enterprise comprising 600,000+ employees and 30,000+ physical sites, you will maintain rigorous security posture across traditional end-user computing (EUC) devices (laptop, desktop, mobile devices & retail terminals), on-premise physical & virtual servers & containerized workloads, and dynamic multi-cloud workloads (AWS, Azure, GCP).

In this role, you will balance proactive protection with business continuity—partnering directly with end-users and application owners to tune policies and eliminate operational friction, while providing tier-3/tier-4 technical escalations to Security Operations Center (SOC) analysts and IT Operations staff during active investigations.

Roles and Responsibilities

A qualified candidate will perform the following duties and responsibilities, but are not limited to:

Fleet-Wide Behavioral Defense & Control Engineering

• Engineer, deploy, and maintain Next-Gen Antivirus (NGAV) and Endpoint Detection & Response (EDR/XDR) agents (e.g., CrowdStrike Falcon, Microsoft Defender for Endpoint, SentinelOne) across hundreds of thousands of heterogeneous endpoints.
• Implement active behavioral protections against zero-day malware, living-off-the-land binarie