ISSE - (Polygraph Required)

Chantilly, VAfull timeOn Site

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senior

H1B: no

Bti36021 Information System Security Engineer (ISSE) at BTI360 responsible for guiding software systems through Authorization & Accreditation (A&A) process. Acts as liaison between technical teams, security stakeholders, and accrediting authorities to ensure secure, compliant solutions.

Responsibilities

Lead or support the Authorization & Accreditation (A&A) process for multiple software systems
Interpret and apply Sponsor-specific security requirements, policies, and control frameworks (based on NIST and Sponsor overlays)
Collaborate with engineering teams early in the development lifecycle to design systems that meet security, compliance, and mission needs
Prepare and maintain security documentation
Guide teams through the accreditation process, ensuring documentation and system posture align with Sponsor expectations
Interface directly with Information System Security Managers (ISSMs), Authorizing Officials (AOs), and security stakeholders
Provide security engineering input on architecture, data flows, boundary protections, and cloud configurations
Champion secure development practices and influence teams to make thoughtful tradeoffs between risk, performance, and agility
Track security posture and coordinate ongoing security monitoring, updates, and control implementation as systems evolve
Lead briefings/meetings with the Sponsor
Minimum Requirements to be Considered for this Role:
Active TS/SCI with Polygraph required at time of application

Qualification

Deep understanding of security controlsStrong collaboration skillsExcellent communication skillsBackground in software engineering

Required

Active TS/SCI with Polygraph required at time of application
Proven experience supporting Authorization & Accreditation (A&A) of classified systems
Deep understanding of security controls, risk assessments, and documentation for ATO submissions
Strong collaboration skills
Familiarity with cloud security architectures and controls (AWS preferred)
Excellent communication skills