Information Security Systems Officer (ISSO) - Senior Consultant with Security Clearance

Job Family :
Cyber Consulting Travel Required :
Up to 10% Clearance Required :
Active Top Secret SCI with Polygraph

What You Will Do:

Our Cybersecurity Consultants are a team of business integrators with extensive consulting and industry experience who help our clients solve their complex business issues from strategy through execution. A career in an integrated team of developers and consultants provides the opportunity to grow and contribute to our clients' business issues every day, applying a collection of security spectrum capabilities, including security strategy and governance, IT risk, security technologies, and cybercrime and breach response.

We are seeking a highly experienced Information Security Systems Officer (ISSO)- to support a major federal initiative. The ISSO serves as a technical and compliance lead, guiding system owners, engineers, and security teams through RMF, ATO, and continuous monitoring activities. This role is responsible for interpreting policy, providing authoritative security guidance, leading audits, and evaluating complex systems across hybrid cloud and on-premises environments.

The ISSO will mentor junior staff and ensure that systems maintain full compliance with federal requirements, NIST security controls, and agency-specific governance. Responsibilities include, but are not limited to:
* Lead design and engineering of secure cloud architectures across AWS, Azure, and hybrid environments.

* Implement and validate NIST 800-53 security controls and cloud-native security services (IAM, encryption, segmentation, logging).

* Conduct cloud threat modeling, risk assessments, and architecture reviews.

* Oversee cloud configuration baselines using STIGs, CIS Benchmarks, and SCAP.

* Drive cloud vulnerability and compliance efforts using ACAS/Nessus and cloud-security posture tools.

* Support RMF engineering activities including boundary definition, inheritance documentation, and authorization packages.

* Integrate cloud-security capabilities such as Sentinel, Splunk, and SIEM logging pipelines.

* Guide Dev Sec Ops  teams on secure CI/CD, container security, and infrastructure-as-code validation.

* Produce cloud architecture diagrams, design documentation, and engineering artifacts.

* Mentor junior and mid-level ISSEs and act as a technical escalation point for cloud engineering issues.

What You Will Need:

* Bachelor's degree from an accredited university.

* Minimum of FIVE (5) years of work experience in cybersecurity or secure systems engineering experience, including cloud architecture.

* An ACTIVE and MAINTAINED TS/SCI Poly Federal or DoD security clearance with a (COUNTERINTELLIGENCE (CI) polygraph - OR - FULL SCOPE (FS/FSP) polygraph).

* US Citizenship is contractually required.

* Strong understanding of security frameworks and compliance standards (e.g., NIST, RMF SP 800-53 Rev 5, DoD 8570).

* Proven experience in designing and implementing enterprise security tools such as SIEM (e.g., Splunk), vulnerability scanners (e.g., Nessus), and endpoint protection platforms (e.g., Crowdstrike).

* Demonstrated ability to lead cross-functional teams and complex technical projects.

* Strong analytical and problem-solving skills.

* Excellent communication skills with the ability to convey technical concepts to non-technical stakeholders. What Would Be Nice To Have:
* Bachelor's degree from an accredited university in Cybersecurity, Information Systems, Computer Engineering, or related technical field.

* Master's Degree in relevant cybersecurity or IT field.

* One or more of the following certifications:

* Certified Information Systems Security Professional (CISSP)

* Certified in Risk and Information Systems Controls (CRISC)

* Certified Authorization Professional (CAP) / Certified in Governance, Risk and Compliance (CGRC)

* Certified Information Systems Auditor (CISA)

* Familiarity with scripting or automation (Power Shell, Python, Bash) is a plus

* Hands-on experience with network security, cryptography, and/or identity management.

* Project Management Professional (PMP) or Scaled Agile Framework (SAFe) certification for managing cybersecurity projects in Agile environments.

What We Offer :
Guidehouse offers a comprehensive, total rewards package that includes competitive compensation and a flexible benefits package that reflects our commitment to creating a diverse and supportive workplace. Benefits include:
* Medical, Rx, Dental & Vision Insurance

* Personal and Family Sick Time & Company Paid Holidays

* Position may be eligible for a discretionary variable incentive bonus

* Parental Leave and Adoption Assistance

* 401(k) Retirement Plan

* Basic Life & Supplemental Life

* Health Savings Account, Dental/Vision & Dependent Care Flexible Spending Accounts

* Short-Term & Long-Term Disability

* Student Loan Pay Down

* Tuition Reimbursement, Personal Development & Learning Opportunities

* Skills Development & Certifications

* Employee Referral Program

* Corporate Sponsored Events & Community Outreach

* Emergency Back-Up Childcare…