Cybersecurity & Compliance Administrator in Denver, Colorado at XCimer Energy

Xcimer Energy leverages decades of research on Inertial Fusion Energy (IFE) combined with groundbreaking new laser architecture. Our mission is to deploy fusion power plants to meet global decarbonization goals as fast as possible. Xcimer has assembled a team of leaders in tough tech, fusion science, and manufacturing with a track record of rapid execution. Supported by leading investors, Xcimer is uniquely positioned to deliver limitless, clean, fusion power to combat climate change.

As Cybersecurity & Compliance Administrator, you will operate and continuously improve Xcimer’s security, compliance, and data privacy posture while the company continues to scale, and support U.S. defenserelated work. This is a handson individual contributor role responsible for daytoday security operations, CMMC 2.0 Level 2 compliance execution, and establishment of a defensible data privacy program appropriate for a highvalue and highvisibility target.

We are looking for our members to apply their technical expertise, problem solving skills, and dedication to quality to positively impact the future of energy!

Microsoft Purview Administration (Compliance & Data Governance)

• Configure and manage Purview capabilities to support compliance objectives, including data classification and labeling, data loss prevention (DLP), retention and deletion policies, eDiscovery workflows, and compliance reporting.
• Develop and maintain Purviewderived compliance artifacts and evidence outputs to support assessments, audits, due diligence, and continuous monitoring aligned to CMMC 2.0 Level 2 and NIST SP 800171.
• Define and operate data retention and deletion procedures, integrating with Purview retention controls where appropriate

Microsoft Defender Administration (Threat Protection & Security Operations)

• Configure, tune, and operate Microsoft Defender security controls across identity, endpoints, email/collaboration, and cloud applications, consistent with licensing and compliance scope.
• Monitor alerts, investigate suspicious activity, and drive remediation actions; reducing noise through continuous tuning and improvements.
• Establish and maintain detection and response playbooks, including alert triage, escalation paths, documentation requirements, and post-incident follow-up.

Incident Response & Threat Prevention

• Own and maintain the Security Incident Response Plan, including severity definitions, roles and responsibilities, evidence handling, escalation paths, and internal/external communication procedures.
• Lead security incident response from identification through containment, eradication, recovery, and lessons learned.
• Perform root-cause analysis and coordinate corrective actions with IT administrative staff and relevant stakeholders.
• Proactively implement threat prevention measures: hardening, secure configuration baselines, conditional access/MFA enforcement support, and policy-driven risk reduction.
• Maintain an incident register covering actual, attempted, and suspected security incidents (including phishing attempts), investigations performed, and outcomes.

Compliance Enablement (CMMC L2 / NIST Controls)

• Maintain the System Security Plan (SSP) and Plan of Actions & Milestones (POA&M) for inscope systems, ensuring clear implementation statements, ownership, and evidence references.
• Support definition and maintenance of the CUI boundary, including systems, users, endpoints, networks, and data flows.
• Translate CMMC and NIST control requirements into concrete configurations, procedures, and ongoing monitoring activities across Microsoft 365, onprem infrastructure, and restricted or airgapped environments.
• Collect, organize, and maintain auditready evidence to support internal assessments, customer diligence, and thirdparty assessments.
• Define and maintain a centralized logging strategy (SIEM) spanning cloud and onprem environments, including ingestion of logs from identity systems, endpoints, email, servers, firewalls, VPNs, and IDS/IPS platforms.

OnPrem & AirGapped Security

• Establish and operate secure data transfer procedures for airgapped and restricted environments, including removable media governance, integrity validation, malware scanning, and chainofcustody documentation.
• Partner with Network Architecture to design and maintain secure monitoring architectures for restricted and airgapped environments, including TAP/SPAN placement, IDS deployment, and segmentation alignment with OT/ICS security best practices

Security Engineering & Integrations

• Support integrations between cloud-based services and the Microsoft security/compliance ecosystem (e.g., log sources, alerting, ticketing workflows, SSO/identity integrations).
• Contribute to automation where appropriate (e.g., scheduled scripts, workflows, or playbook-style response actions).

Cross-Functional Collaboration & Communication

• Work closely with IT and engineering teams to ensure smooth operations and secure-by-default practices.
• Document, categorize, and prioritize security issues to ensure efficient escalation and resolution.
• Enforce approved security, compliance, and privacy policies and contribute to ongoing policy development and improvement.
• Collaborate with Network Architecture on secure network design, segmentation strategy, and enforcement controls including firewall policy, IDS/IPS, and Zero Trust network principles.
• Collaborate with Network Architecture on secure network design, segmentation strategy, and enforcement controls including firewall policy, IDS/IPS, and Zero Trust network principles
• Implement privacy impact assessments (PIAs) for new systems or processes involving personal data.
• Partner with Legal and HR to document the company’s GDPR and CCPA applicability position, including the basis where such laws do not apply.
• Support inclusion of appropriate data privacy and security terms in thirdparty contracts and service agreements.

• Education: Bachelor’s degree (or equivalent practical experience) in information technology, cybersecurity, information systems, or a related field.
• Experienece: 7+ years of experience in security administration, security operations, compliance operations, or adjacent IT roles with direct security responsibility.
• Demonstrated handson experience administering Microsoft 365 security and compliance services, including Microsoft Purview and Microsoft Defender in an enterprise environment.
• Proven background in security incident response, investigation, and documentation in regulated or highrisk environments.
• Working knowledge of system security best practices, access control, secure configuration, and audit logging.
• Strong written and verbal communication skills; able to translate technical security risk into clear, actionable steps and documentation.
• Comfortable operating as a selfdirected individual contributor in a fastpaced and evolving environment.
• Excellent technical and interpersonal communication skills; able to translate security risk into actionable steps.
• Comfortable in a fast-paced, dynamic, and ambiguous environment.
• Positive attitude, strong ownership mindset, strong professional judgement and ability to earn trust and maintain professional relationships.
• Must be a U.S. citizen or national, U.S. permanent resident (current Green Card holder), or lawfully admitted into the U.S. as a refugee of granted asylum

• Direct experience implementing or operating CMMC Level 2 and/or NIST SP 800171 controls, including evidence collection and assessment preparation.
• Experience with centralized logging or SIEM platforms and detection playbook development.
• Experience with cloud-based service integrations (webhooks/REST APIs) and security-relevant automation.
• Experience with security-related scripting/automation practices and languages (Python, JavaScript, Ansible, SOARstyle workflows etc.).
• Familiarity with hybrid cloud and onprem infrastructure in regulated environments, including airgapped networks.