ACAS Lead (Air-Gapped IL6) / Staff Vulnerability Engineer

About Zscaler Zscaler accelerates digital transformation to ensure our customers can be more agile, efficient, resilient, and secure. As an AI-forward enterprise, we are constantly pushing the envelope, leveraging the world’s largest security data lake to power our cloud-native Zero Trust Exchange platform. This innovation protects our customers from cyberattacks and data loss by securely connecting users, devices, and applications in any location. Here, impact in your role matters more than title and trust is built on results. We say, impact over activity. We seek innovators who actively use AI to amplify their impact and who thrive in an environment where we leverage intelligent systems to stay ahead of evolving threats. We believe in transparency and value constructive, honest debate—we’re focused on getting to the best ideas, faster. We build high-performing teams that can make an impact quickly and with high quality. To do this, we are building a culture of execution centered on customer obsession, collaboration, ownership, and accountability. We value high-impact, high-accountability with a sense of urgency where you’re enabled to do your best work and embrace your potential. If you’re driven by purpose, thrive on solving complex challenges, and want to be part of the team that’s helping to secure the AI age, we invite you to bring your talents to Zscaler and help shape the future of cybersecurity. Role We are looking for an ACAS Lead / Staff Vulnerability Engineer to join our Engineering team. This is a fully onsite role based near Crystal City, VA, reporting to the VP of Product Security. You will operate as the founding vulnerability management engineer inside a brand-new U.S. Federal IL6 (SCIF) environment. This role is critical to maintaining our multitenant architecture and global security footprint. This is a rare "Zero-to-One" opportunity to build the vulnerability management engine, engineer the offline infrastructure, and establish the governance playbook from the ground up, free from legacy technical debt. You will define the end-to-end vulnerability management architecture, including platform selection, sizing, and security control implementation strategy for the new air-gapped IL6 environment. You will ensure we enable organizations worldwide to harness speed and agility while operating strictly within a U.S. SCIF and adhering to one-way diode transfer protocols. What You’ll Do (Role Expectations) Design and execute authenticated and unauthenticated network and host scanning using IL6-approved tools (Tenable.sc, Nessus Manager, or ACAS) Advance the continuous security monitoring controls in the environment as autonomous and innovative systems Oversee patch and system hardening campaigns (aligning with DISA STIGs and IAVM directives) in collaboration with IL6 service owners Develop and deliver high-impact reports, integrating POA&M tracking and remediation status Maintain essential documentation including runbooks, SOPs, exception governance, and change control processes within the SCIF environment Who You Are (Success Profile) You thrive in ambiguity. You're comfortable building the path as you walk it. You thrive in a dynamic environment, seeing ambiguity not as a hindrance, but as the raw material to build something meaningful. You act like an owner. Your passion for the mission fuels your bias for action. You operate with integrity because you genuinely care about the outcome. True ownership involves leveraging dynamic range: the ability to navigate seamlessly between high-level strategy and hands-on execution. You are a problem-solver. You love running towards the challenges because you are laser-focused on finding the solution, knowing that solving the hard problems delivers the biggest impact. You are a high-trust collaborator. You are ambitious for the team, not just yourself. You embrace our challenge culture by giving and receiving ongoing feedback—knowing that candor delivered with clarity and respect is the truest form of teamwork and the fastest way to earn trust. You are a learner. You have a true growth mindset and are obsessed with your own development, actively seeking feedback to become a better partner and a stronger teammate. You love what you do and you do it with purpose. What We’re Looking for (Minimum Qualifications) U.S. Citizenship with an active U.S. Secret clearance Experience in End-to-End Vulnerability Management, specifically building and administering Tenable.sc, Nessus Manager, or ACAS in disconnected/air-gapped environments Solid understanding of risk-based prioritization (CVSS, EPSS), remediation lifecycle, and SLA governance What Will Make You Stand Out (Preferred Qualifications) DoD 8570/8140 IAT Level II certification (e.g., Security+ CE, GSEC, SSCP, or CySA+) Experience with modern scanning methodologies, including CSPM (Cloud Security Posture Management) concepts, Web Application Scanning (WAS), and Container Security Scripting skills for automation in disconnected environments Understanding of government cloud and container operations, including classified environments (AWS C2S/SC2S, ECS/Kubernetes, VM hardening) and exposure to FedRAMP High/Moderate isolated ticketing workflows (Jira or ServiceNow) #LI-KM9 #LI-Onsite Zscaler’s salary ranges are benchmarked and are determined by role and level. The range displayed on each job posting reflects the minimum and maximum target for new hire salaries for the position across all US locations and could be higher or lower based on a multitude of factors, including job-related skills, experience, and relevant education or training. The base salary range listed for this full-time position excludes commission/ bonus/ equity (if applicable) + benefits. Base Pay Range $115,500—$165,000 USD At Zscaler, we are committed to building a team that reflects the communities we serve and the customers we work with. We foster an inclusive environment that values all backgrounds and perspectives, emphasizing collaboration and belonging. Join us in our mission to make doing business seamless and secure. Our Benefits program is one of the most important ways we support our employees. Zscaler proudly offers comprehensive and inclusive benefits to meet the diverse needs of our employees and their families throughout their life stages, including: Various health plans Time off plans for vacation and sick time Parental leave options Retirement options Education reimbursement In-office perks, and more! Learn more about Zscaler’s Future of Work strategy, hybrid working model, and benefits here. By applying for this role, you adhere to applicable laws, regulations, and Zscaler policies, including those related to security and privacy standards and guidelines. Zscaler is committed to providing equal employment opportunities to all individuals. We strive to create a workplace where employees are treated with respect and have the chance to succeed. All qualified applicants will be considered for employment without regard to race, color, religion, sex (including pregnancy or related medical conditions), age, national origin, sexual orientation, gender identity or expression, genetic information, disability status, protected veteran status, or any other characteristic protected by federal, state, or local laws. See more information by clicking on the Know Your Rights: Workplace Discrimination is Illegal link. Pay Transparency Zscaler complies with all applicable federal, state, and local pay transparency rules. Zscaler is committed to providing reasonable support (called accommodations or adjustments) in our recruiting processes for candidates who are differently abled, have long term conditions, mental health conditions or sincerely held religious beliefs, or who are neurodivergent or require pregnancy-related support.