Senior Platform Engineer - TS/SCI with CI Polygraph

Company: Modern Government Solutions
Location: Sterling
Posted on: February 13, 2026

Job Description:

Job Description Job Description TITLE: Senior Platform Engineer LOCATION: Sterling, VA CLEARANCE REQUIRED: Active DoD TS/SCI with CI Polygraph EMPLOYMENT TYPE: Full-time, On-site POSITION SUMMARY Modern Government Solutions (MGS) is seeking a Senior Platform Engineer to design, build, and sustain secure, cloud-based platform and infrastructure solutions supporting mission-critical government programs. This role will lead complex engineering efforts across cloud environments, DevSecOps automation, CI/CD pipelines, and platform operations, ensuring systems are scalable, resilient, and compliant with security requirements. The Senior Platform Engineer will collaborate closely with internal engineering teams, customers, and stakeholders to integrate platform components, implement monitoring and performance visibility, support operational troubleshooting, and deliver well-documented, high-quality solutions within classified environments. RESPONSIBILITIES (not limited to): Perform complex design, development, implementation, architecture specification, and maintenance activities for platform and infrastructure solutions. Deploy and maintain cloud-based infrastructure, integrating platform components and operators using IaC, CaC, and DevSecOps principles. Develop and maintain automated CI/CD pipelines for databases, servers, and applications using tools such as Jenkins, Terraform, Ansible, Foreman, GitLab, and Selenium. Create and maintain automated unit tests, ensuring required code coverage and quality standards are met. Test new features and services, identify defects, and implement fixes to support reliable deployments. Develop and enhance monitoring and reporting solutions using tools such as Prometheus, Grafana, and Splunk. Configure and manage IdAM services, including Active Directory and LDAP resources. Support operational activities, including troubleshooting, root cause analysis, remediation, and creation of technical documentation (e.g., user guides, how-to guides, infrastructure diagrams). Provide technical expertise across systems, infrastructure, tools, external interfaces, and related technical areas. Manage networking and access controls, including ingress/egress routing and zero-trust access concepts. Collaborate with internal engineering teams and customer end users to design, enhance, and support application user interfaces that meet complex technical and functional requirements. Work closely with clients and cross-functional teams to troubleshoot software systems, support maintenance activities, and communicate project status and technical issues. Support environments spanning both Linux and Windows platforms, applying strong troubleshooting and problem-solving skills. Communicate effectively with technical and non-technical stakeholders, including customers and leadership, both verbally and in writing. Apply engineering rigor and best practices, including configuration management and testing. Monitor system performance and contribute to technical briefings for government and senior leadership as needed. Collaborate effectively within an Agile scrum team, working productively in group environments. REQUIRED SKILLS AND QUALIFICATIONS Must possess an active Department of Defense (DoD) TS/SCI with CI Polygraph security clearance. Bachelor's degree in a STEM discipline (e.g., Computer Science, Engineering, Information Systems, or related field). Must meet DoD 8570 requirements, including Security CE or an equivalent certification. 10 years of relevant professional experience in systems, platform, cloud, or DevSecOps engineering roles. Strong expertise with CI/CD, DevSecOps, test automation, and automated deployments in iterative development environments. Proven experience architecting and building scalable, secure, distributed systems in single- or multi-cloud environments (AWS preferred; Azure acceptable). Hands-on experience with Kubernetes and cloud-native security, including containerized development environments. Experience working with relational and non-relational databases, such as PostgreSQL, MySQL, MongoDB, and Elasticsearch. Experience integrating complex systems using APIs, messaging/streaming platforms, and ETL pipelines. Experience implementing environment monitoring, logging, and performance visibility. Working knowledge of DevOps and automation tools including Ansible, Terraform, Jenkins, GitLab, and Foreman. Experience with automated testing tools (e.g., Selenium) and developing automated test plans for functional and security requirements. Knowledge of identity and access management (IdAM) technologies, including Active Directory, SAML, OpenLDAP, OAuth 2.0, and OIDC. Experience with cloud architecture and system design, including building and integrating cross-domain capabilities. Experience developing integration interfaces and services using languages such as Python, PowerShell, and Groovy, and working with API gateways and service catalogs. Experience using Elasticsearch for search, analytics, and data discovery within platform environments. Familiarity with customer security requirements and processes within regulated or classified environments. Strong troubleshooting and problem-solving skills, with the ability to analyze complex technical issues and implement effective solutions. Excellent written and verbal communication skills, including the ability to clearly document systems and explain complex topics to technical and non-technical audiences. PREFERRED SKILLS AND QUALIFICATIONS Experience architecting or integrating with workflow, ticketing, or automation platforms, such as ServiceNow or custom-built systems. Experience designing and integrating APIs and event-driven systems, including REST- or GraphQL-based services. Familiarity with identity and directory services, including Active Directory. Experience with cloud solution optimization and exposure to additional cloud providers beyond AWS (e.g., Azure, Google Cloud, Oracle, IBM). Experience configuring and instrumenting monitoring, visualization, and analytics tools to provide end-to-end system visibility (e.g., Grafana, Splunk, Tableau). Experience integrating virtualized or streamed applications, including application layering techniques. Familiarity with model-based systems engineering (MBSE) tools and environments (e.g., Teamwork Cloud, Cameo, IBM ELM). Experience supporting or administering collaboration and enterprise tools, such as SharePoint. Ability to contribute to a system-level perspective, understanding dependencies and relationships across cloud services, infrastructure, and security domains. ABOUT US At MGS, we believe a people-first culture corresponds to organizational success through a commitment to excellence, integrity, inclusion, and an attitude that welcomes challenges meets demands, sustains growth, and drives innovation. We provide expert mission-first technical and programmatic services and solutions for the US intelligence community, the US Department of Defense, and other governmental agencies. We create people-first organizational cultures where employees feel needed in the system, not a system that needs employees. We provide you with long-term career opportunities centrally focused on our core value system: inclusion, integrity, and a commitment to excellence. MGS is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, or protected veteran status, and will not be discriminated against on the basis of disability.

Keywords: Modern Government Solutions, Potomac , Senior Platform Engineer - TS/SCI with CI Polygraph, IT / Software / Systems , Sterling, Maryland