Senior Platform Engineer

MANTECH seeks a motivated, career and customer-oriented Senior Platform Engineer to join MANTECHs Intelligent Engineering organization. The position is remote (US-based) with up to 10% travel. Responsibilities include but are not limited to: Manage and optimize RHEL, CentOS, and Rocky server environments, focusing on kernel tuning and troubleshooting hardware-level interruptions Develop and maintain complex Ansible roles and inventories to automate multi-node environments and debug failed playbooks Utilize Python and Ruby to develop, maintain, and enhance various application services and API interactions Automate repetitive CLI tasks and manage system processes through expert-level Unix shell scripting Implement and manage virtualization solutions using KVM and QEMU to support scalable infrastructure needs Configure and troubleshoot Layer 2 and Layer 3 networking, including VLAN tagging, bridge interfaces, and virtual switches Lead STIG and CMMC compliance efforts to ensure all systems meet rigorous federal and defense security standards Minimum qualifications: 9+ years of relevant experience managing RHEL/CentOS/Rocky environments, specializing in kernel tuning, hardware-level interrupt troubleshooting, and deep-dive performance profiling to resolve system bottlenecks Experience executing STIG and CMMC protocols Expert in Ansible (roles/inventories) integrated with Terraform or OpenStack to orchestrate complex, full-stack underlying infrastructure Proficient in Python, Ruby, and Java for backend service maintenance, API extension, and advanced Unix shell scripting for CLI automation Hands-on expertise in KVM/QEMU and L2/L3 networking, including VLAN tagging, bridge interfaces, and virtual switch configuration Proven ability to build CI/CD pipelines for automated multi-node deployment testing, supported by familiarity with Modeling & Simulation (M&S) standards Preferred qualifications: Proven experience leading organizations through full CMMC Level 3+ certification cycles and architecting automated STIG compliance-as-code frameworks that reduce manual audit overhead by over 50% Mastery of GitOps workflows (e.g., ArgoCD or Flux) to manage large-scale Ansible and Terraform deployments, with a focus on building self-healing infrastructure and custom provider development Expert-level capability in tuning Linux kernels for low-latency environments or Real-Time (RT) patches, specifically for Large Scale Modeling & Simulation (M&S) workloads requiring precise timing and hardware acceleration Advanced ability to design and implement custom RESTful APIs and microservices in Python or Java that bridge legacy M&S protocols with modern, cloud-native orchestration layers Clearance Requirements: Must have an active Secret security clearance with the ability to obtain and maintain a TS/SCI security clearance Physical Requirements: Must be able to remain in a stationary position 50% Needs to occasionally move about inside the office to access file cabinets, office machinery, etc. Frequently communicates with co-workers, management, and customers, which may involve delivering presentations Must be able to exchange accurate information in these situations