Engineer IV, Cybersecurity

*X-energy LLC conducts a thorough recruiting process and will never issue offers without interview to discuss qualifications and responsibilities. All applications will be submitted via our company career page,* *www.x-energy.com/careers/* *. We will never ask you to provide payment information as part of the recruiting process. If anyone claiming to represent X-energy directs you in a manner otherwise, please contact us at* *www.x-energy.com/contact-us* *.*

Job Description

This role is responsible for developing, implementing, and maintaining key cybersecurity technologies across both X-energy corporate and TRISO fuel facility operations, including Endpoint Detection and Response (EDR), Network Detection and Response (NDR), Security Information and Event Management (SIEM), and Security Orchestration, Automation, and Response (SOAR). The position serves as a critical bridge between corporate IT infrastructure and the TRISO fuel facility, conducting software evaluations, performing architecture reviews, and identifying and addressing cybersecurity gaps between the two environments.

In addition to the tooling and operations duties, this role leads structured threat modeling and cyber evaluation activities. The analyst applies established methodologies such as STRIDE to identify, categorize, and prioritize threats across systems, data flows, and trust boundaries spanning the corporate and TRISO fuel facility environments. This includes facilitating threat modeling sessions during architecture reviews and software evaluations, translating identified threats into actionable mitigations, and reassessing threat models as architectures evolve to ensure security gaps between environments are documented, tracked, and remediated.

Responsibilities include conducting proactive threat hunts, monitoring endpoint and network data, collecting and analyzing digital forensic artifacts including malware, coordinating with the Xe infrastructure team, and meet...