Senior Platform Engineer - TS​/SCI CI Polygraph

TITLE: Senior Platform Engineer

LOCATION: Sterling, VA

CLEARANCE REQUIRED: Active DoD TS/SCI with CI Polygraph

EMPLOYMENT TYPE: Full-time, On-site

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, Dev Sec Ops  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.

• 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 Dev Sec Ops  principles.
• Develop and maintain automated CI/CD pipelines for databases, servers, and applications using tools such as Jenkins, Terraform, Ansible, Foreman, Git Lab, 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.
• Collab y effectively within an Agile scrum team, working productively in group environments.

• 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 Dev Sec Ops  engineering roles.
• Strong expertise with CI/CD, Dev Sec Ops , 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 Postgre
  
  SQL, MySQL, Mongo
  
  DB, and Elasticsearch.
• Experience integrating complex systems using APIs, messaging/streaming platforms, and ETL…