REQUIRES AN ACTIVE/EXISTING TS/SCI WITH CI POLYGRAPH - NO REMOTE WORK, MUST WORK ON SITE DAn Solutions is seeking a Senior Computer Systems Engineer / Architect to support a newly awarded Defense Intelligence Agency program in Charlottesville, VA. This position will provide senior-level systems engineering, architecture, integration, and technical support for mission-critical applications and infrastructure operating in a classified environment. An active TS/SCI with current CI Polygraph is required.Responsibilities include:Develop and evaluate system architectures, technical designs, interfaces, and integration approachesTranslate mission and technical requirements into scalable engineering solutionsSupport integration across applications, cloud infrastructure, databases, APIs, networks, and security componentsDevelop and maintain architecture diagrams, data-flow diagrams, interface documentation, and technical specificationsSupport AWS and classified cloud environmentsIdentify technical risks, dependencies, performance issues, and opportunities for modernizationSupport system integration, testing, deployment, troubleshooting, and sustainmentCollaborate with software developers, DevOps engineers, system administrators, cybersecurity personnel, and government stakeholdersSupport RMF, accreditation, and technical security activities as requiredProvide senior technical guidance and engineering recommendationsRequired Qualifications:Active TS/SCI with current CI PolygraphSenior-level experience in systems engineering, systems architecture, solutions architecture, or a closely related disciplineExperience supporting complex enterprise, DoD, or Intelligence Community systemsExperience designing or integrating software, infrastructure, cloud, data, and enterprise servicesStrong understanding of systems architecture, interfaces, and technical dependenciesExperience producing system diagrams, technical documentation, and engineering artifactsStrong troubleshooting and analytical skillsAbility to work onsite in Charlottesville, VAPreferred Qualifications:Previous DIA or Intelligence Community experienceExperience with AWS or classified cloud environments such as TC2S/SC2SExperience with Linux, Docker, PostgreSQL, REST APIs, and DevSecOps environmentsExperience with CI/CD pipelines and infrastructure automationExperience supporting RMF, ATO, or security accreditation activitiesSecurity+ or equivalent IAT Level II certificationExperience supporting mission-critical intelligence applicationsExperience with cloud modernization or systems integration efforts Salary Range Disclaimer: The posted salary range represents the good-faith minimum and maximum compensation DAn Solutions expects to pay for this position. The position may be filled at different Labor Category (LCAT) levels depending on the selected candidate's qualifications and applicable contract requirements. Final compensation within the posted range will be determined based on the applicable LCAT and factors including education, relevant experience, certifications, and other required qualifications