Senior Systems Engineer SME

About the role

Location: Washington, DC / National Capital Region - Onsite. SHR Consulting Group, LLC is a small business delivering enterprise IT, cybersecurity, and program management services to the Department of Defense and federal civilian agencies. We support mission-critical infrastructure at the Pentagon and across the National Capital Region, and we invest in our people through competitive compensation, professional certification support, and long-term career growth on stable, multi-year programs. SHR Consulting Group is seeking a Senior System Engineer Subject Matter Expert (SME) to provide senior-level engineering, infrastructure administration, cybersecurity, application integration, and Tier III support for DISA J6's ITS/DMM environment. The Senior System Engineer SME will support highly available mission-critical systems, Windows Server and Microsoft infrastructure, application integrations, automation, cybersecurity compliance, system upgrades, incident resolution, and Authority to Operate (ATO) sustainment. This role includes onsite maintenance, BearTracks upgrades, server availability, system-health monitoring, network/server troubleshooting, application support, system engineering, and cybersecurity compliance.

Responsibilities

• Provide senior systems engineering and Tier III technical support for the ITS/DMM environment.
• Administer and maintain Windows Server, Microsoft SQL Server, Internet Information Services (IIS), enterprise applications and associated infrastructure.
• Monitor system performance, availability, application health, infrastructure, hardware, and software.
• Diagnose and resolve complex server, application, network, integration, and infrastructure issues.
• Support installation and upgrades of ITS, BearTracks, Digital Mail, and supporting applications.
• Support enterprise application integrations and REST API services.
• Develop automation and administrative solutions using PowerShell, Python, C#, C++.
• Provide technical support for planned and unplanned network, application, and infrastructure changes.
• Support Tier I‑Tier III technical escalations and incident resolution.
• Assess system configurations and recommend infrastructure, software, hardware, and technology improvements.
• Develop and maintain system documentation, operating procedures, troubleshooting guides, and technical documentation.
• Coordinate infrastructure changes through Government change‑management processes.
• Support system testing, validation, upgrades, enhancements, and technology refresh activities.
• Collaborate with Government technical teams, application developers, cybersecurity teams, and other contractor organizations.
• Support Risk Management Framework (RMF) activities.
• Support ATO development and sustainment.
• Develop and maintain STIG‑related documentation and configurations.
• Support ACAS vulnerability identification and remediation.
• Maintain Plans of Action and Milestones (POA&Ms).
• Support system hardening and cybersecurity engineering.
• Coordinate with DISA J6's ATO team and technical stakeholders.
• Ensure infrastructure and applications remain compliant with applicable DoD/DISA requirements.

Requirements

• Bachelor's degree in Information Technology, Computer Science, Cybersecurity, Information Systems, or a related discipline; equivalent experience may be accepted in lieu of the degree.
• Minimum 7 years of experience supporting enterprise systems engineering, infrastructure administration, and/or Tier III technical support.
• Experience administering Windows Server, Microsoft SQL Server, and IIS environments.
• Experience supporting enterprise application integrations and REST API services.
• Experience using PowerShell and Python and/or C#/C++ for scripting, automation, or systems administration.
• Experience with RMF, ATO, STIGs, ACAS vulnerability remediation, and cybersecurity engineering.
• Experience supporting highly available, mission‑critical enterprise systems.
• Experience coordinating infrastructure changes through formal enterprise change‑management processes.
• Experience operating within DoD IT and cybersecurity environments.
• DoD 8570/8140 IAT Level III compliant certification, such as CASP+, CISSP, or Government‑approved equivalent.
• Active Secret clearance required at minimum; U.S. citizenship required.

Skills

Windows Server, Microsoft SQL Server, IIS, PowerShell, Python, C#, C++, REST API, RMF, ATO, STIGs, ACAS, POA