Senior Information Systems Security Officer (ISSO) - Technical Lead

Job Family: IT Cyber Security Travel Required: None Clearance Required: Active Top Secret (TS) 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 Senior Information System Security 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 the implementation, assessment, and enhancement of NIST 800‑53 security controls across cloud, hybrid, and on Prem environments. Oversee RMF and ATO package development, review, and approval processes, including SSPs, IRPs, ISCPs, CMPs, and POA&M. Serve as a senior security advisor to system owners, program leadership, and regulatory bodies. Lead internal and external audit preparation, documentation, artifact collection, and response strategies. Conduct advanced risk assessments, architecture reviews, and system security analyses. Guide POA&M management and direct the remediation of vulnerabilities identified via ACAS, STIG, SCAP, and agency‑specific scans. Support continuous monitoring programs, change control reviews, and ongoing security lifecycle management. Mentor Junior and Mid‑Level ISSOs; contribute to process standardization and governance improvements. Review emerging threats and provide security recommendations to align systems with evolving federal and agency requirements. Mentor junior and mid‑level ISSOs and act as a technical escalation point for cloud engineering issues. What You Will Need: Bachelor’s degree in Cybersecurity, Information Systems, Computer Engineering, or related technical field. Minimum of NINE (9) years of cybersecurity or secure systems engineering experience, including cloud architecture. An ACTIVE and CURRENT TOP SECRET federal or DOD security clearance. 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). Secure configuration management and vulnerability lifecycle management Advanced use of ACAS/Nessus, STIG Viewer, SCAP Compliance Checker Experience with cloud security practices and technologies (AWS, Azure, GCP). 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: Master’s Degree in relevant cybersecurity or IT field One or more of the following certifications: ISC2 Zero Trust Strategy Certificate Certified Information Security Manager (CISM) Certified Information Systems Security Professional (CISSP) Certified Authorization Professional (CAP) / Certified in Governance, Risk and Compliance (CGRC) IAT Level II (Information Assurance Technical) IAM Level II (Information Assurance Management) Familiarity with scripting or automation (PowerShell, Python, Bash) is a plus Hands‑on experience with network security, cryptography, and/or identity management. Experience working with DevOps/engineering teams on secure design, change reviews, and risk mitigation. Project Management Professional (PMP) or Scaled Agile Framework (SAFe) certification for managing cybersecurity projects in Agile environments The annual salary range for this position is $113,000.00‑$188,000.00. Compensation decisions depend on a wide range of factors, including but not limited to skill sets, experience and training, security clearances, licensure and certifications, and other business and organizational needs. 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 Parental Leave 401(k) Retirement Plan Group Term Life and Travel Assistance Voluntary Life and AD&D Insurance Health Savings Account, Health Care & Dependent Care Flexible Spending Accounts Transit and Parking Commuter Benefits Short-Term & Long-Term Disability Tuition Reimbursement, Personal Development, Certifications & Learning Opportunities Employee Referral Program Corporate Sponsored Events & Community Outreach Care.com annual membership Employee Assistance Program Supplemental Benefits via Corestream (Critical Care, Hospital Indemnity, Accident Insurance, Legal Assistance and ID theft protection, etc.) Position may be eligible for a discretionary variable incentive bonus About Guidehouse Guidehouse is an Equal Opportunity Employer–Protected Veterans, Individuals with Disabilities or any other basis protected by law, ordinance, or regulation. Guidehouse will consider for employment qualified applicants with criminal histories in a manner consistent with the requirements of applicable law or ordinance including the Fair Chance Ordinance of Los Angeles and San Francisco. #J-18808-Ljbffr