Senior Systems & Cybersecurity Engineer

Position Title: Sr. Systems & Cybersecurity Engineer

Location: Falls Church, VA

Assignment Type: 1 month contract

Pay Rate: $90 / Hour

Work Schedule: Onsite, Monday - Friday

Benefits: This position may be eligible for medical, dental, vision, and 401(k).

Position Overview

Addison Group is seeking a highly knowledgeable and hands-on Senior Systems & Cybersecurity Engineer with deep expertise in secure enterprise infrastructure environments to support our client to meet CMMC compliance requirements. The ideal candidate will have advanced experience in Microsoft server ecosystems, virtualization, cybersecurity frameworks (including CMMC), network security, and enterprise systems integration.

This role requires strong architectural, operational, and security capabilities across on-prem infrastructure, compliance-driven environments, and high-availability enterprise systems.

Key Responsibilities

Cybersecurity & Compliance

• Lead and support CMMC compliance initiatives (implementation, documentation, controls validation).
• Design and manage enterprise cybersecurity programs aligned with NIST and CMMC frameworks.
• Oversee vulnerability scanning, remediation planning, and risk mitigation.
• Administer and optimize SIEM platforms for monitoring, alerting, and incident response.
• Manage enterprise endpoint protection solutions.
• Implement and manage MFA solutions (DUO preferred).
• Secure configuration and management of sFTP systems.

Infrastructure & Systems Administration

• Architect and manage on-premises infrastructure using Hyper-V.
• Deploy, maintain, and secure Windows Server 2025 environments.
• Administer and troubleshoot:
  • Active Directory (AD)
  • Group Policy
  • DNS
  • Certificate Authority (PKI / CA)
• Configure and maintain Microsoft Exchange (on-prem or hybrid).
• Implement and manage redundancy and failover solutions for critical services.
• Oversee enterprise storage systems and capacity planning.
• Configure and maintain Backup System.

Networking & Security

• Advanced configuration and management of Cisco firewalls (CCNA or CCNP prefer).
• Design and maintain secure network architecture.
• Configure and secure IIS web servers.
• Support and maintain enterprise SQL Server environments.

Required Qualifications

• 7+ years of enterprise systems engineering experience.
• Demonstrated experience supporting C MMC-compliant environments.
• Advanced knowledge of Microsoft server ecosystems.
• Strong hands-on experience with Hyper-V virtualization.
• Advanced network security experience including Cisco firewall configuration.
• Experience implementing high-availability and disaster recovery solutions.
• Strong understanding of PKI, MFA, SIEM, and endpoint security systems.
• Ability to independently architect, deploy, and secure enterprise environments.

Preferred Certifications

• CCNA (or CCNP prefer.)
• CISSP
• Security+
• Microsoft Certified: Windows Server / Azure
• CMMC RP or equivalent compliance certification

Key Competencies

• Strong problem-solving and analytical skills
• Deep understanding of secure enterprise design
• Documentation and compliance mindset
• Ability to manage multiple critical systems simultaneously
• Strong communication skills with both technical and executive stakeholders

Addison Group is an Equal Opportunity Employer. Addison Group provides equal employment opportunities (EEO) to all employees and applicants for employment without regard to race, color, religion, gender, sexual orientation, national origin, age, disability, genetic information, marital status, amnesty, or status as a covered veteran in accordance with applicable federal, state and local laws. Addison Group complies with applicable state and local laws governing non-discrimination in employment in every location in which the company has facilities. Reasonable accommodation is available for qualified individuals with disabilities, upon request.

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