Senior Platform Engineer – TS Required

SIXGEN

Senior Platform Engineer at SixGen building and scaling virtualization infrastructure for high-assurance environments. Design and operate networking and monitoring stack for secure operations.

Posted 7/28/2026full-timeSterling • Virginia • 🇺🇸 United StatesSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in building and securing high-assurance infrastructure, with a focus on virtualization, networking, and automation. Proficient in managing complex environments with a strong emphasis on security, documentation, and operational excellence.

Highest-signal resume keywords

Active TS/SCI ClearanceType-1 Hypervisor ExpertiseInfrastructure-as-Code FluencyNetwork Security SkillsLinux Systems Administration

ATS Keywords

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Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills

VirtualizationLinux Systems AdministrationNetwork EngineeringEndpoint SecurityInfrastructure-as-CodeAutomationPythonBashCIS/STIG ComplianceDocumentation

Tools & Technologies

Proxmox VEKVM/QEMUVMware ESXiTerraformAnsiblePackerGitCI/CDObservability/SIEM StackVPNs

Industry Keywords

High-Assurance EnvironmentZero-Trust DesignStateful FirewallsSecrets ManagementFull-Disk EncryptionMeasured BootAttack-Surface ReductionClusteringShared StorageDocumentation in Runbooks

Tech Stack

Tools & technologies

AnsibleDNSFirewallsLinuxPackerPythonTCP/IPTerraformTypeScriptVMware

About the role

Key responsibilities & impact

We are seeking a Senior Platform Engineer to build, secure, administer, and scale the in-house infrastructure that supports a sensitive, high-assurance environment.
You will design and operate the virtualization, networking, identity, and monitoring stack our teams depend on — standing infrastructure up from bare metal, automating it end to end, and keeping it secure, reliable, and auditable.
The ideal candidate pairs deep hypervisor and Linux systems expertise with strong network and endpoint security, infrastructure-as-code fluency, and the discipline to run a controlled, well-documented environment.
You will own the platform end to end — virtualization, segmentation, identity and secrets, software supply chain, and observability — and turn architecture into a resilient, production-ready capability.

Requirements

What you’ll need

5+ years in platform, infrastructure, systems, or DevOps engineering — building and administering production virtualization, networking, and Linux environments.
Active TS/SCI clearance.
Deep hands-on expertise with a Type-1 hypervisor (Proxmox VE, KVM/QEMU, VMware ESXi, or equivalent), including clustering, shared storage, templating, and GPU passthrough.
Strong network engineering and security skills: segmentation, stateful firewalls, zero-trust / least-privilege design, VPNs, DNS, PKI/mTLS, and TCP/IP fundamentals.
Demonstrated endpoint and OS hardening across Linux and Windows to CIS/STIG baselines: full-disk encryption, measured boot, host firewalls, and attack-surface reduction.
Fluency in infrastructure-as-code and automation (e.g., Terraform, Ansible, Packer) plus Python and Bash, with a track record of shipping and maintaining working tooling and pipelines.
Working knowledge of secrets management, containerization, Git and CI/CD, and an observability/SIEM stack.
Proven ability to stand up infrastructure from bare metal to operational, document it in runbooks, and operate it under security- and audit-sensitive conditions.

Benefits

Comp & perks

Employer-paid health insurance premiums (medical, dental, vision) for you and your family
Employer-paid short/long term disability insurance and basic life/AD&D insurance
401K with a 4% employer contribution
Professional development reimbursement options available (training, certification, education, etc)
Flexible and remote work policies for most positions
Flexible PTO and holiday schedule