Security Engineer

MNS Group is a cybersecurity-focused IT Partner providing MSP, MSSP, and Compliance Services. Our security guidance and deep federal experience help government contractors solve critical network security and compliance issues to win contracts and secure our nation.

The Security Engineer is responsible for implementing, maintaining, and improving security controls across client environments as well as maintaining internal MSG infrastructure. This role supports incident response, endpoint security, Microsoft 365 security configuration, vulnerability remediation, and compliance execution (ex: NIST / CMMC readiness).

This position requires strong technical ownership, sound judgment, and the ability to operate independently across multiple client environments and MNS internal infrastructure. The Security Engineer is expected to take responsibility for issues through resolution, maintain clear and accurate documentation, communicate effectively with technical and non-technical stakeholders, and consistently apply established security standards and best practices. This role requires the ability to prioritize competing demands, identify and elevate risk appropriately, and contribute to the continued improvement and standardization of MNS security processes, tooling, and client security baselines.

• Monitor and respond to security alerts across endpoint, email, identity, and cloud platforms
• Triage and investigate suspicious activity (phishing, malware, lateral movement indicators, unauthorized access attempts)
• Perform containment actions (isolation, credential resets, policy changes, IOC blocking)
• Coordinate escalation and communication with internal leadership and clients as needed
• Participate in post-incident reviews and recommend improvements

• Ensure endpoints meet baseline security standards (patching, encryption, AV/EDR coverage, least privilege), both for clients and internal MSG standards
• Support remediation of malware and persistent threats
• Manage and enforce device compliance policies through Intune (where applicable)

• Configure and support Microsoft Defender security controls (Defender for Endpoint, Defender for Office, etc.)
• Support M365 identity protection: MFA, Conditional Access, SSO integrations, risky sign-in remediation
• Secure Exchange Online (anti-phishing policies, mail flow rules, quarantine management)
• Support secure SharePoint/One Drive access controls and external sharing governance
• Assist with secure tenant configurations and security posture improvements

• Run or support vulnerability scans and interpret results
• Prioritize remediation based on risk and business impact
• Coordinate patching and configuration changes with IT and client stakeholders
• Validate remediation actions and document outcomes

• Support client security initiatives aligned to frameworks such as NIST 800-171 / CMMC, as it relates to Gov Con Managed Services
• Maintain security-related documentation
• Help standardize baseline security controls across environments

• Create and maintain SOPs, security runbooks, and client security documentation in ITGlue
• Maintain accurate ticket notes, investigation details, and remediation steps
• Identify repeat security issues and propose standard improvements
• Improve internal consistency for security baselines, tool usage, and escalation procedures

• 4–6 years of technical IT experience, including 2+ years of security experience.
• Strong troubleshooting ability across:
• Windows endpoints and common security failure modes
• Identity and authentication issues,…