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Security Engineer- Breach & Attack Simulation (TS/SCI CI Poly)

Guidepointsecurity

Chantilly, VA (Federal) Remote permanent

Posted: December 2, 2025

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Job Description

GuidePoint Security provides trusted cybersecurity expertise, solutions and services that help organizations make better decisions and minimize risk. By taking a three-tiered, holistic approach for evaluating security posture and ecosystems, GuidePoint enables some of the nation’s top organizations, such as Fortune 500 companies and U.S. government agencies, to identify threats, optimize resources and integrate best-fit solutions that mitigate risk.

Candidates MUST have an active Top Secret/SCI clearance with a CI Poly within 10 years for consideration. This position is 100% onsite in Chantilly, VA.

Security Engineers fuel solutions to ensure enterprise security deployments make the deepest impact possible across an organization. They solve organizations’ most challenging problems, including the ones they didn't know existed. They are self-motivated, have an insatiable thirst to learn new technologies and thrive in a fast paced environment. Lastly, they feel comfortable mastering new technologies and come from a variety of business, analytic and technology backgrounds.

Experience with Automated Security Validation is not necessary for this role (although it would be great to have). We will train someone with the tool if they have a solid foundation in cyber security.

Role and Responsibilities:


Complete internal training program for Automated Security Validation (ASV) [previously known as Mandiant Security Validation (MSV)]


Drive complex security focused deployments of ASV while working side by side with the customers to solve their unique problems across a variety of use cases


Work with our customers to understand their security posture and requirements


Support our security deployments by unlocking the potential of ASV to assist our customers in achieving their Cyber Security strategy


Collaborate across the entire organization to bring access to product and technical teams to get the right solution delivered and drive innovation gathered from customer input


Leverage previous experiences, share best practices and create innovative solutions to push user adoption and maximize the value of ASV


Enable customers to solve the next wave of questions on their own

Position Requirements:


7-10 years of security systems engineering and troubleshooting experience


Must have an understanding of cyber-based threat techniques and procedures to compare industry related events, exposures, and incidents with open source and gathered intelligence research to determine threat capability and intent, and the potential impact of the threat on customer network architecture and operations


Understanding of the MITRE ATT&CK Framework and/or other cyber security threat based frameworks used to track adversaries and associated TTPs

• Proficiency developing log ingestion and aggregation strategies


Familiarity with key security events on common IT platforms


Proficiency in client and server operating systems including Windows, Mac, and Linux


General networking, host, and security based troubleshooting (firewalls, routing, NAT, etc.)


Ability to autonomously prioritize and successfully deliver across a portfolio of projects


Must possess an active DoD 8570-compliant cyber certification at IAT Level II or better (CompTIA Security+, CEH, etc)


An active TS/SCI clearance with an active polygraph

Preferred Requirements:


Familiar with configuration and administration of enterprise SIEM tools


SIEM and/or network/host based detection engineering experience


Working Knowledge of Operating System Auditing (both Syslog and Window Event Log) preferred

• Experience working with Mandiant Security Validation, or other breach and attack simulation (BAS) solutions


Red/Purple teaming experience


Scripting and development skills (BASH, Perl, Python or Java) with strong knowledge of regular expressions


Experience developing SOC runbooks/workflows, policy, and best practice documentation


Bachelor’s degree in a relevant discipline or equivalent professional experience

We use Greenhouse Software as our applicant tracking system and Zoom Scheduler for HR screen request scheduling. At times, your email may block our communication with you. Please be sure to check your SPAM folder so that you don't miss updates on your application.

Why GuidePoint?

GuidePoint Security is a rapidly growing, profitable, privately-held value added reseller that focuses exclusively on Information Security. Since its inception in 2011, GuidePoint has grown to over 1000 employees, established strategic partnerships with leading security vendors, and serves as a trusted advisor to more than 4,200 customers.

Firmly-defined core values drive all aspects of the business, which have been paramount to the company’s success and establishment of an enjoyable workplace atmosphere. At GuidePoint, your colleagues are knowledgeable, skilled, and experienced and will seek to collaborate and provide mentorship and guidance at every opportunity.

This is a unique and rare opportunity to grow your career along with one of the fastest growing companies in the nation.

Some added perks….

• Remote workforce primarily (U.S. based only, some travel may be required for certain positions, working on-site may be required for Federal positions)

• Group Medical Insurance options: Zero Deductible PPO Plan (GuidePoint pays 90% of the premium for employees and 70% for family plans (spouse/children/family) or High Deductible Health Plan with HSA (GuidePoint pays 100% of the employees premiums and 75% for family plans (spouse/children/family) and GPS will contribute in one lump sum: ($500 per EE annually / $1000 per family annually (includes spouse/children/family options)

• Group Dental Insurance: GuidePoint pays 100% of the premium for employees and 75% of family plans

• 12 corporate holidays and a Flexible Time Off (FTO) program

• Healthy mobile phone and home internet allowance

• Eligibility for retirement plan after 2 months at open enrollment

• Pet Benefit Option

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