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TwentyTwentyArlington, VA

IT Security Engineer

IT Security Engineer responsible for designing, implementing, and maintaining enterprise security infrastructure including firewalls, SIEM monitoring, vulnerability management, IAM, and compliance. Requires 5+ years IT security experience, strong networking and cloud knowledge.

116k – 195k
On-site5+ YOESecurity Engineering

About the role

Responsibilities

  • Design, implement, and maintain enterprise network security architecture, including firewalls, intrusion detection systems, VPNs, and DMZs.
  • Develop and enforce security policies, standards and procedures across the organization.
  • Conduct security assessments, vulnerability scans and penetration testing to identify and remediate security gaps.
  • Monitor systems and networks 24/7 using security information and event management (SIEM) tools; investigate and respond to security incidents.
  • Manage access controls, identity and access management (IAM), and multi-factor authentication (MFA) solutions.
  • Establish and manage data loss prevention (DLP) and encryption protocols for sensitive data at rest and in transit.
  • Perform security hardening of servers, workstations, and endpoints; manage patch management and system updates.
  • Provide security awareness training and education to employees to foster a security-conscious culture.
  • Conduct root cause analysis on security incidents and prepare incident response reports and recommendations.
  • Ensure compliance with relevant regulations (CMMC, SOC 2, GDPR, PCI-DSS, or industry-specific standards as applicable).

Requirements

  • Bachelor's degree in Computer Science, Information Security, or related field (or equivalent professional experience).
  • 5+ years of professional IT security experience, with demonstrated expertise in at least two of the following domains: network security, systems security, or cybersecurity.
  • Strong knowledge of TCP/IP, DNS, DHCP, and network protocols; experience with firewalls, proxies, and network segmentation.
  • Hands-on experience with security tools such as Splunk, ELK Stack, Snort, Suricata, or similar SIEM and IDS/IPS platforms.
  • Proficiency in systems security, including endpoint protection and vulnerability management.
  • Experience with cloud security (AWS, Azure, or GCP) and containerized environments (Docker, Kubernetes).
  • Understanding of common attack vectors and security frameworks (NIST, CIS Controls, OWASP Top 10).
  • Excellent problem-solving skills with the ability to work independently and as part of a team.
  • Strong communication skills to explain complex security concepts to non-technical stakeholders.

Nice-to-haves

  • Security certifications such as CISSP, CISM, CEH, CCNA Security, Security+, or similar.
  • Experience with security automation and Infrastructure as Code (Terraform, Ansible).
  • Knowledge of application security testing (SAST/DAST) and secure development practices.
  • Experience with incident response and forensics investigations.
  • Familiarity with compliance frameworks and audit processes.

Skills

Network SecuritySIEMSplunkIds/IpsIAMMFADlpCloud SecurityAWSAzureGCPDockerKubernetesTerraformAnsible
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