Cleared On Site Sr. Information Systems Security Engineer (ISSE) (5363)

<div class="ui-form-item ui-form-item-horizontal" data-direction="horizontal"> <div class="ui-form-field lifesuite__rte--display"> <div class="ui-form-field lifesuite__rte--display"> <p>SMX is seeking a highly experienced <strong>Information Systems Security Engineer (ISSE) – Sr</strong> to support a mission-critical federal program in Washington, DC. This individual will serve as a senior cybersecurity and security engineering professional responsible for designing, implementing, assessing, and maintaining security controls that protect enterprise systems, applications, and infrastructure supporting critical mission operations.&nbsp;The selected candidate will function as a senior technical expert supporting multiple cybersecurity initiatives, authorization efforts, and security engineering activities. This role requires extensive experience in Risk Management Framework (RMF) implementation, security architecture, vulnerability management, security testing, and system authorization activities. The ideal candidate will possess strong technical leadership capabilities and the ability to evaluate security risks, develop mitigation strategies, and guide engineering teams in implementing effective security solutions. This position is on site in Washington, DC and requires an active <strong>TS/SCI</strong> clearance.&nbsp;&nbsp;</p> <p><strong><span data-contrast="auto"><strong class="ng-binding">Essential Duties &amp; Responsibilities:</strong></span></strong></p> <ul> <li>Lead security engineering activities supporting enterprise systems, applications, and infrastructure environments</li> <li>Design, implement, and assess security controls in accordance with federal cybersecurity requirements and industry best practices</li> <li>Develop, maintain, and review System Security Plans (SSPs), Business Impact Analyses (BIAs), Continuity of Operations Plans (COOPs), mitigation plans, and other security documentation</li> <li>Establish and maintain system authorization boundaries, security architectures, hardware inventories, software inventories, and access control documentation</li> <li>Create and maintain security assessment plans, test procedures, and security validation methodologies</li> <li>Conduct security testing, vulnerability assessments, control validation activities, and risk analyses</li> <li>Evaluate security findings and develop technical solutions to mitigate vulnerabilities and reduce organizational risk</li> <li>Support Authorization to Operate (ATO) activities, continuous monitoring programs, and compliance initiatives</li> <li>Analyze security alerts, vulnerabilities, system weaknesses, and emerging threats to determine operational impacts and remediation priorities</li> <li>Coordinate with system owners, developers, engineers, ISSOs, and government stakeholders to ensure security requirements are incorporated throughout the system lifecycle</li> <li>Support audit preparation, compliance assessments, and security reviews conducted by internal and external organizations</li> <li>Evaluate security architecture designs and recommend improvements to strengthen enterprise security posture</li> <li>Lead remediation efforts for identified vulnerabilities and security deficiencies</li> <li>Provide technical guidance and mentorship to junior security engineers and cybersecurity personnel</li> <li>Evaluate cybersecurity program performance and recommend improvements that enhance security effectiveness and operational efficiency</li> <li>Support major technology initiatives and modernization efforts by integrating security requirements throughout planning, design, implementation, and sustainment phases</li> </ul> <p><strong><span data-contrast="auto">Required Skills &amp; Experience</span></strong></p> <ul> <li>Active TS/SCI clearance required</li> <li>Minimum of 8 years of professional experience supporting cybersecurity, security engineering, information assurance, or related disciplines</li> <li>Demonstrated experience serving as a senior security engineer, lead cybersecurity practitioner, or technical security subject matter expert</li> <li>Extensive experience implementing and assessing security controls in accordance with NIST and federal cybersecurity requirements</li> <li>Experience supporting Risk Management Framework (RMF) activities and Authorization to Operate (ATO) processes</li> <li>Experience developing and maintaining SSPs, POA&amp;Ms, Security Assessment Plans, authorization boundary diagrams, and related security artifacts</li> <li>Experience conducting vulnerability assessments, security testing, control validation, and risk assessment activities</li> <li>Experience evaluating system architectures, security configurations, and technical implementations for compliance and security effectiveness</li> <li>Strong understanding of NIST 800-53, NIST 800-37, continuous monitoring, and federal cybersecurity standards</li> <li>Experience supporting enterprise security programs within complex technology environments</li> <li>Experience analyzing security findings and developing risk-based mitigation strategies</li> <li>Strong analytical, troubleshooting, and problem-solving skills</li> <li>Ability to communicate complex security concepts to technical and non-technical audiences</li> <li>Strong written and verbal communication skills</li> <li>Ability to work independently while managing multiple priorities and technical initiatives</li> </ul> <p><strong><span data-contrast="auto">Desired Skills &amp; Experience</span></strong><span data-ccp-props="{&quot;335559739&quot;:0}">&nbsp;</span></p> <ul> <li>Bachelor’s degree in Cybersecurity, Computer Science, Information Technology, Engineering, Information Systems, or related field</li> <li>Advanced degree preferred</li> <li>Experience supporting federal government, law enforcement, intelligence community, or national security programs</li> <li>Experience supporting cloud security architectures and cloud-based authorization efforts</li> <li>Experience supporting Governance, Risk, and Compliance (GRC) platforms and security automation initiatives</li> <li>Familiarity with enterprise security tools including:</li> <ul> <li>Splunk</li> <li>Tenable Nessus</li> <li>Security Center</li> <li>Endpoint Detection and Response (EDR) Platforms</li> <li>Vulnerability Management Platforms</li> <li>Security Information and Event Management (SIEM) Tools</li> </ul> <li>Experience supporting Zero Trust initiatives and cybersecurity modernization efforts</li> <li>Experience supporting Agile, SAFe, and DevSecOps environments</li> <li>One or more of the following certifications preferred:</li> <ul> <li>CISSP</li> <li>CAP (Certified Authorization Professional)</li> <li>CASP+</li> <li>CISM</li> <li>CCSP</li> <li>Security+</li> <li>GSEC</li> <li>Other relevant cybersecurity certifications</li> </ul> <li><span data-ccp-props="{&quot;335559739&quot;:0}">Experience supervising, mentoring, or leading cybersecurity teams preferred</span></li> </ul> <p><strong><span data-contrast="auto">Application Deadline:</span></strong><span data-contrast="auto">&nbsp;</span><span data-ccp-props="{}"> 9-4-2026</span></p> <p><span data-contrast="auto">#</span><span data-ccp-props="{}"> LI-SA1</span></p> </div> </div> </div><div class="content-pay-transparency"><div class="pay-input"><div class="description"><p>&nbsp;</p> <hr> <p><span style="font-size: 16px;">The SMX salary determination process takes into account a number of factors, including but not limited to, geographic location, Federal Government contract labor categories, relevant prior work experience, specific skills, education and certifications. At SMX, one of our Core Values is to Invest in Our People so we offer a competitive mix of compensation, learning &amp; development opportunities, and benefits. Some key components of our robust benefits include health insurance, paid leave, and retirement.</span></p></div><div class="title">The proposed salary for this position is:</div><div class="pay-range"><span>$126,000</span><span class="divider">&mdash;</span><span>$212,000 USD</span></div></div></div><div class="content-conclusion"><p>&nbsp;</p> <p>At SMX®, we are a team of technical and domain experts dedicated to enabling your mission. From priority national security initiatives for the DoD to highly assured and compliant solutions for healthcare, we understand that digital transformation is key to your future success.</p> <p>We share your vision for the future and strive to accelerate your impact on the world. We bring both cutting edge technology and an expansive view of what’s possible to every engagement. Our delivery model and unique approaches harness our deep technical and domain knowledge, providing forward-looking insights and practical solutions to power secure mission acceleration.</p> <p>SMX is an Equal Opportunity employer including disabilities and veterans.</p> <p><span data-teams="true"><span id="message-body-1758638857922" class="fui-ChatMyMessage__body rcngbzt ___eyw0iv0 f10pi13n ftqa4ok f2hkw1w f8hki3x f1d2448m f1bjia2o ffh67wi f1j6vpng f1pniga2 f987i1v f1ffjurs f15bsgw9 f14e48fq f18yb2kv fd6o370 ffwy5si f3znvyf f57olzd f4stah7 f480a47 fs1por5 fk6fouc figsok6 fkhj508 f19n0e5 f9ijwd5 fzqqayd f10ostut f1o0qvyv f9ggezi f1xp5gbu f150uoa4 ffyari3 fo7qwa0 f16xkysk fxowb0n f11ghf3q f13aoclr flypziy f10kwr27 fquw1qa fftr39l f13lathq f15hsm81 f2ss68y ffb60jq f8nuap2 f13nk4fk f7jacry fq08z5q fd9af6s fr74w9q fcl9uv6 f13sm7pj f1u6qqly f16wpxbl faim3u9 f6cs3qo fa2w2z3 fd39nx6 f10gn8j9 frcqmxy f1w9ws4k f1ddxkqj fd10euv fvuz61 f1nbc6gw"><span id="content-1758638857922" class="fui-Primitive ___16zla5h f1oy3dpc fqtknz5 fyvcxda"></span></span></span></p> <div id="x_Signature"></div> <p>Selected applicant may be subject to a background investigation and/or education verification.</p> <p>SMX does not sponsor a new applicant for employment authorization or immigration related support for this position (i.e. H1B, F-1 OPT, F-1 STEM OPT, F-1 CPT, J-1, TN, E-2, E-3, L-1 and O-1, or any EADs or other forms of work authorization that require immigration support from an employer).</p></div>