Forescout Cyber Security Engineer (MID)

DAn Solutions, Inc; Washington (District of Columbia); On-site; USD 120,000 - 170,000; Full time

Job summary

DAn Solutions, Inc. is seeking an experienced ForeScout Network Security Systems Administrator to support deployment, administration, and troubleshooting of enterprise IT and cybersecurity infrastructure in a secure multi-domain environment.

The role emphasizes ForeScout CounterACT, Windows and Linux systems, Active Directory, and network security tooling. A TS/SCI clearance with polygraph eligibility is required and on-site work in Reston, VA or Washington, DC is expected.

Qualifications

• 3+ years of Windows or Linux systems administration experience.
• Experience deploying ForeScout CounterACT appliances.
• Experience with multi-domain architectures and enterprise networks.
• Active TS/SCI clearance with ability to obtain Counterintelligence Polygraph.

Responsibilities

• Deploy, configure, and maintain ForeScout CounterACT appliances in a complex enterprise environment.
• Support ForeScout across multi-domain environments (data center, WAN, LAN, cloud).
• Perform Windows and/or Linux admin tasks including installation, configuration, troubleshooting, and upgrades.
• Manage network configuration: Ports, switches, VLANs, firewalls, and guest networks.
• Assist with security compliance activities and documentation; support risk management and assessments.

Skills

3+ years experience

Troubleshooting

Team collaboration

Excellent communication

Education

High School Diploma +7y

Associate's degree +5y

Bachelor's degree +3y

Master's degree +1y

Tools

ForeScout CounterACT

Active Directory

Windows

Linux

Splunk

Job description

REQUIRES AN ACTIVE / EXISTING TS/SCI WITH CI POLY - NO REMOTE WORK

Location: Reston, VA OR Washington, DC

Position Description:

Position Overview

We are seeking an experienced ForeScout Network Security Systems Administrator to support the deployment, administration, maintenance, and troubleshooting of enterprise IT and cybersecurity infrastructure within a secure, multi-domain environment.

This role will work extensively with ForeScout CounterACT, Windows and Linux systems, network infrastructure, Active Directory, firewalls, VLANs, and enterprise cybersecurity tools. The successful candidate will provide hands‑on technical support across systems, network, and security environments while helping maintain system availability, performance, compliance, and security.

This position requires an active TS/SCI clearance and the ability to obtain a Counterintelligence Polygraph.

Key Responsibilities

• Deploy, configure, administer, and maintain ForeScout CounterACT appliances within a complex enterprise environment.

• Support the installation and integration of ForeScout across multi-domain environments, including data center, WAN, LAN, and virtualized architectures.

• Perform Windows and/or Linux systems administration, including:

  • System installation and configuration

  • Troubleshooting and issue resolution

  • Monitoring system availability and performance

  • Applying operating system, application, and security upgrades

  • Supporting system hardening and security requirements

• Perform network engineering and administration activities, including:

  • Installation and activation of network ports

  • Switch configuration

  • LAN and VLAN configuration and troubleshooting

  • Firewall and network appliance support

  • Network connectivity troubleshooting

• Support network and enterprise services including Active Directory, domain management, guest LAN environments, and related infrastructure services.

• Troubleshoot technical issues across systems, networking, and cybersecurity infrastructure.

• Integrate and analyze cybersecurity data using enterprise or custom data aggregation and analysis tools, including Splunk.

• Provide Tier II IT operations and maintenance support, including responding to tickets, documenting technical work, updating ticket information, troubleshooting incidents, and implementing remediation.

• Support cybersecurity compliance activities and implementation of applicable federal information security requirements.

• Assist with security assessments, system authorization activities, risk management processes, and remediation efforts.

• Maintain technical documentation, procedures, configuration information, and troubleshooting records.

• Coordinate technical activities with customers, cybersecurity personnel, engineers, administrators, and other stakeholders.

• Independently identify and resolve technical issues while collaborating effectively within a larger technical team.

Basic Qualifications

• 3+ years of experience performing Windows or Linux systems administration, including experience with:

  • Basic troubleshooting

  • System installation and configuration

  • Monitoring system performance and availability

  • Performing operating system and security upgrades

• Experience deploying and/or performing daily administration and maintenance of ForeScout CounterACT appliances.

• Experience with network engineering or network administration, including one or more of the following:

  • Physical or logical network configuration

  • Installation and activation of network ports

  • Switch configuration

  • LAN and VLAN administration

  • Network firewalls and appliances

  • Active Directory

  • Guest LAN environments

  • Domain administration

• Knowledge of multi-domain architectures, including data center, WAN, LAN, and virtualized environments.

• Active TS/SCI clearance with the ability to obtain a Counterintelligence Polygraph.

• Education and experience meeting one of the following combinations:

  • High School Diploma or GED and 7+ years of experience supporting IT projects and activities

  • Associate's degree and 5+ years of experience supporting IT projects and activities

  • Bachelor's degree and 3+ years of experience supporting IT projects and activities

  • Master's degree and 1+ years of experience supporting IT projects and activities

• Must possess, or obtain within 30 days of the start date, a DoD 8570 IAT Level III certification, such as:

  • SecurityX (formerly CASP+)

  • CCNP Security

  • CISA

  • CISSP or Associate of CISSP

  • GCED

  • GCIH

  • CCSP

• Ability to obtain a DoD 8570 Cybersecurity Service Provider – Infrastructure Support (CSSP-IS) qualifying certification prior to beginning work on the contract. Qualifying certifications may include:

  • CEH

  • CySA+

  • GICSP

  • SSCP

  • CHFI

  • CFR

  • Cloud+

  • CND

Preferred Qualifications

• ForeScout Certified Administrator (FSCA) and/or ForeScout Certified Engineer (FSCE) certification.

• Experience installing and deploying ForeScout within a multi-domain customer environment.

• Knowledge of federal information security policies, standards, procedures, directives, and frameworks.

• Familiarity with federal security authorization, assessment, and risk management processes for enterprise systems.

• Experience integrating cybersecurity data using Splunk or similar enterprise data aggregation and analysis platforms.

• Experience working in a Tier II IT operations and maintenance environment.

• Experience documenting ticket activity, technical issues, remediation actions, and resolution information.

• Strong troubleshooting and analytical skills across systems, networking, and cybersecurity technologies.

• Ability to independently manage assignments and priorities with limited supervision.

• Ability to work effectively in a collaborative technical environment.

• Excellent verbal and written communication skills.

• Strong customer‑facing skills with the ability to coordinate technical efforts and establish productive working relationships.

Certifications

Candidates must meet applicable DoD 8570/8140 workforce certification requirements, including IAT Level III and CSSP Infrastructure Support requirements within the timelines specified above.