Senior Information Systems Security Engineer (ISSE)

DAn Solutions
Reston, VA

**REQUIRES AN ACTIVE/EXISTING TS/SCI WITH CI POLYRAPH**

The job duties of the Sr. ISSE are as follows:

Provides technical expertise to ensure the network systems meet DIA C&A and IA requirements and are properly certified and accredited

Responsibilities are full-time on customers onsite and will cover classified programs and Special Access Programs (SAP). No Telework.

Designs develops and recommends integrated security system and physical control solutions that will ensure proprietary/confidential data and systems are protected

Assist team in DIAs Authorization and Accreditation (A&A) process using RMF across the design lifecycle for classified systems obtaining and maintaining Interim Authorization to Test (IATT) Authority to Connect (ATC) and Authorization to Operate (ATO)

Offers technical engineering services for the support of integrated security systems and solutions managing information-related risks effectively

Works closely with the client during the strategic design process to translate security and business requirements into actionable technical designs

Configures and validates secure systems and physical controls and tests security products and systems to detect security weakness

Develop comprehensive system test plans (STP) to assess the security posture of the information systems

Analyze scan results and security findings to prioritize remediation efforts and implement corrective measures

Participate in incident response activities and assist in the resolution of security incidents as needed

Requirements:

Exhibits advanced Windows administration capabilities and Linux proficiency for optimal system management

Security credentials certifications and experience commensurate with the job description

Practical experience deploying maintaining and troubleshooting security tools

Demonstrates the ability to critically assess current practices identify deficiencies propose innovative solutions and effectively implement these improvements

Thrives in a fast-paced complex environment; displays exceptional poise and an unwavering commitment to hard work

Displays excellent problem-solving abilities and attention to detail

Experience with each of the following security tools: Assured Compliance Assessment Solution (ACAS) Trellix Splunk and Security Technical Implementation Guide (STIG)s

Collaborate with stakeholders to identify security requirements and ensure alignment with organizational objectives

Stay abreast of the latest security trends technologies and best practices to continually enhance the security posture of the information systems

A Bachelors Degree from an accredited institute in an area applicable to this position and four (4) years of relevant experience

An additional four (4) years of relevant experience may be substituted for the bachelors degree

Must presently be 8570 compliant (IAT Level 2 preferred); must be 8570 compliant (IAT Level 2) by date of security indoctrination with any necessary continuing education (CE) for certification

Desired Qualifications:

Familiar with tiered security environments (U S TS)

Deep understanding of Trellix antivirus suite of products

Knowledge of Splunk architecture and experience structuring multi-level queries

Windows expert - capable of advanced Powershell scripting and general administrative functions

Experience with one or more commercial government cloud service providers system accreditation process

Experience as a Cybersecurity Control Assessor for SAP

Experience with Ongoing Authorizations and Assessments

Experience with C2S Cloud or DevOpsSec

Required Experience:

Senior IC

Posted 2025-11-22

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