Senior Information Systems Security Engineer ISSE (TS/SCI with Polygraph Required)

Senior Information Systems Security Engineer (ISSE) Location: Aurora, CO

Clearance Required: TS/SCI with Polygraph

Sign-On Bonus: Yes

DeNOVO Solutions is seeking a Senior ISSE to support a program that designs and evaluates system security architecture and engineering solutions across applications, platforms, data, networks, cloud, and tactical edge environments. This role translates cybersecurity requirements into implementable technical controls and validates that the integrated design achieves the intended risk posture. The Senior ISSE leads major technical workstreams, translates mission needs into executable plans, reviews the work of other team members, and owns quality, schedule, and technical outcomes.

Primary Responsibilities

• Develop security architecture, trust boundaries, data flows, control allocations, and secure design patterns.
• Engineer identity, credential, access management, encryption, key management, network segmentation, endpoint, application, container, and cloud security controls.
• Perform threat modeling, attack-surface analysis, security trade studies, and risk assessments.
• Review software, hardware, data, API, and interface designs for security weaknesses and compliance gaps.
• Define security requirements, verification methods, test procedures, and acceptance criteria.
• Support Zero Trust implementation, cross-domain considerations, supply-chain security, and secure tactical edge operations.
• Analyze vulnerabilities and recommend technically effective remediation or compensating controls.
• Coordinate with architects, developers, administrators, ISSOs, assessors, and Government cybersecurity leadership.

Required Tech Skills And Tools Architecture and threat-modeling tools; vulnerability and code scanning; cloud and container security platforms; PKI/IAM tools; SIEM; network analysis; GRC repositories; security test tools

Preferred Qualifications Experience supporting Army, DoD, Intelligence Community, or C5ISR programs; experience with classified environments, agile delivery, cloud-to-edge architectures, DDIL operations, and Government product demonstrations.

Desired Certifications CISSP; Security+; CCSP; cloud security or architecture certification

Required Experience And Education

• Minimum of 10 years of experience as an ISSE
• Minimum of 10 years of experience supporting government programs, projects, or contracts
• BS Degree in Information Technology or related discipline. You may substitute the BS Degree requirement with 2 additional years of Software Engineering experience.

Salary Range: $140,000.00 to $155,000.00

Note: The above salary range is a guideline and represents a broad spectrum of potential compensation. We recognize that a candidate's unique experience and qualifications may justify compensation beyond this range. Therefore, we remain open to considering higher salary offers for exceptionally qualified candidates.

Why Join DeNOVO Solutions? At DeNOVO Solutions, we make improving the competitive position of our customer paramount in importance and work collaboratively to ensure the best service possible. DeNOVO Solutions provides cleared personnel and cost competitive solutions to our customers. We strive to be the leader amongst small businesses in the Intelligence Community and provide personnel with talent & skills equal to the larger companies. As a Minority-Owned and Service-Disabled Veteran-Owned Small Business (MO/SDVOSB), we are dedicated to providing the best technical and professional services throughout the Intelligence Community (IC).

Our benefits package for full-time employees includes:

• Medical, Dental, and Vision Premiums 100% Employer Paid for you and your legal dependents or plus up, cost split plan.
• 401k with 6% Match
• 11 Paid Federal Holidays
• 120 hours of Paid Time Off (PTO)
• Company Outings and Trips
• Tuition Reimbursement, Skillset Training, and New/Renewed Certification assistance
• HomeFundIt Company Down Payment Match – Employer match towards the down payment of buying a new home

DeNOVO Solutions is an Equal Opportunity/Affirmative Action Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, age, disability, marital status, veteran status, sexual orientation, genetic information or any other protected characteristic under applicable law.

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