Senior Tier 3 Platform Engineer

Peraton•Chantilly, VA

3d•$112,000 - $179,000•Onsite

About The Position

Peraton is seeking a Senior Platform Engineer to lead technical implementation, operation, and sustainment for a mission-critical enterprise software platform supporting an Intelligence Community customer. The platform provides a standardized developer and user experience across multiple classified enclaves and uses a zero trust, hub-and-spoke architecture. The engineer will independently design, implement, and maintain platform infrastructure, automation, and shared services, and act as a senior Tier 3 escalation resource for complex enterprise incidents. The role owns critical platform components, leads root cause analysis, and drives improvements to availability, security, and operational performance. It also provides technical guidance to junior engineers and Tier 2 support personnel and collaborates with architecture, cybersecurity, and operations teams. This position is fully onsite in Chantilly, Virginia. It requires rotating shifts within a 6:00 AM–6:00 PM, seven-day onsite coverage window, as well as participation in a shared after-hours on-call rotation.

Requirements

Active TS/SCI clearance with Polygraph.
Bachelor's degree in Computer Science, Engineering, Information Systems, or a related technical field, and at least 8 years of relevant experience; an additional 4 years of relevant experience may substitute for a degree.
Extensive hands-on experience operating, engineering, and troubleshooting production containerized workloads using Kubernetes or a Kubernetes-based platform.
Experience designing and supporting infrastructure in at least one major cloud environment (AWS, Azure, or a government cloud region) and in hybrid cloud or on-premises environments.
Experience developing and maintaining infrastructure as code using Terraform, Ansible, or similar automation technologies.
Experience designing, implementing, and maintaining CI/CD pipelines and automated deployment processes.
Ability to independently troubleshoot complex technical issues across Linux systems, networking, container infrastructure, and identity and access management.
Experience independently managing production incidents, problem management, and technical escalations under established service levels.
Experience leading root cause analysis, developing corrective actions, and implementing solutions to prevent recurring production issues.
Experience providing technical guidance or mentorship to engineering or operations personnel.
DoD 8140 / 8570 IAT Level II certification, such as Security+ CE, or ability to obtain the required certification within the established timeframe.
Ability to work rotating shifts within the established seven-day onsite coverage window and participate in the shared after-hours on-call rotation.

Nice To Haves

Experience supporting enterprise platforms across multiple classification levels or security enclaves, including cross-domain data movement.
Experience implementing zero trust architecture principles and security controls within enterprise cloud environments.
Experience with IT service management tools, including ServiceNow.
Experience implementing and maintaining observability platforms such as Prometheus, Grafana, Splunk, or Elastic.
Experience supporting Risk Management Framework authorization activities, continuous monitoring, or continuous Authority to Operate (cATO).
Kubernetes certifications such as CKA, CKAD, or CKS, and/or a cloud professional certification.
Prior experience supporting Intelligence Community or Department of Defense mission programs.

Responsibilities

Design, deploy, configure, and sustain enterprise platform components across hybrid cloud and on-premises environments, including Kubernetes-based container orchestration platforms.
Own the technical implementation and operational health of assigned platform components, shared services, and infrastructure capabilities.
Develop and maintain infrastructure as code using Terraform, Ansible, or similar technologies to automate provisioning and configuration management.
Design, implement, and maintain CI/CD pipelines for secure, automated, and repeatable platform deployments.
Implement and maintain zero trust security controls, including identity-aware access, network segmentation, and least-privilege policies.
Lead technical onboarding of mission tenants, applications, and shared services in alignment with platform standards and architecture.
Improve platform reliability, scalability, performance, and operational efficiency.
Establish and improve observability, including centralized logging, metrics, alerting, and operational dashboards.
Serve as a senior Tier 3 escalation resource for complex incidents involving compute, storage, networking, identity, and container infrastructure.
Independently troubleshoot and resolve production issues across Linux systems, cloud infrastructure, Kubernetes, networking, and identity and access management.
Lead root cause analysis for significant incidents, develop corrective action plans, and coordinate remediation across engineering teams, vendors, and partner organizations.
Address recurring operational issues through automation, engineering solutions, and updated runbooks.
Coordinate incident response and technical escalations to support resolution within established service levels.
Partner with cybersecurity personnel on security controls, continuous monitoring, and technical evidence for RMF authorization and continuous ATO.
Mentor Mid-Level engineers and Tier 2 support personnel and promote consistent troubleshooting and operational practices.
Maintain technical documentation, operational procedures, and knowledge base content.
Participate in technical planning and operational coordination to support enterprise platform availability.
Participate in rotating onsite shifts and the shared after-hours on-call rotation.

Benefits

Medical benefits
Dental insurance
Vision insurance
Life insurance
Health savings account
Short- and long-term disability
Employee assistance program
Parental leave
401(k)
Paid time off for vacation
Company-paid holidays
Potential eligibility for overtime, shift differential, and a discretionary bonus