Senior Linux Systems Administrator

Avenue Technologies and Commodities Inc; Dallas (TX); On-site; USD 120,000 - 150,000; Full time

Job summary

Avenue Technologies and Commodities Inc in Dallas is seeking a Tier III Operations Engineer to maintain the availability, performance, and reliability of mission-critical systems. You will provide advanced troubleshooting and incident resolution, coordinating with Operations, Engineering, and vendors to ensure service continuity.

The role requires a active TS/SCI with CI Poly clearance, U.S. citizenship, and willingness to work extended hours on-call.

Qualifications

• Security+ or CISSP certification required.
• Strong Linux knowledge and administration skills.
• Excellent communication for complex topics.
• Experience troubleshooting APIs and security appliances.
• Ability to analyze logs, metrics, and diagnostics quickly.
• Capable of working independently under pressure during incidents.
• Willingness to work extended hours and on-call.

Responsibilities

• Lead diagnosis and resolution of complex incidents beyond Tier I/II.
• Troubleshoot across servers, OS, networking, databases, storage, and apps.
• Participate in incident response during outages and coordinate recovery.
• Monitor system health, performance, and capacity; identify issues early.
• Develop and maintain operating docs, guides, and SOPs.
• Support maintenance, upgrades, patching, and change management.
• Collaborate with engineering to improve resiliency and automation.
• Identify recurring issues and propose long-term improvements.

Skills

Security+ or CISSP

Linux expertise

Strong communication

API troubleshooting

Incident response

Work under pressure

Education

B.S. in STEM

Tools

Grafana

Prometheus

Promtail

Loki

Jira

Confluence

Job description

Job Title:Tier III Operations Engineer
Location:Onsite – Dallas, TX Area
Clearance:Active TS/SCI with CI Poly
Citizenship:U.S. Citizen

Position Summary

The Tier III Operations Engineer is responsible for maintaining the availability, performance, and reliability of mission-critical systems. This role serves as the highest level of operational support, providing advanced technical troubleshooting and incident resolution for complex infrastructure and application issues. The engineer collaborates with Operations, Engineering, and external vendors to ensure system stability and continuous service availability.

Key Responsibilities

• Lead diagnosis and resolution of complex incidents that cannot be resolved by Tier I or Tier II support teams
• Perform advanced troubleshooting across servers, operating systems, networking, databases, storage, virtualization, and enterprise applications
• Participate in incident response during critical outages and coordinate technical recovery efforts
• Monitor system health, performance, and capacity to proactively identify potential issues
• Develop and maintain operational documentation, troubleshooting guides, and standard operating procedures
• Support planned maintenance, system upgrades, patching, and change‑management activities
• Collaborate with engineering teams to improve system resiliency, automation, and operational efficiency
• Identify recurring issues and recommend long‑term improvements to increase reliability and reduce operational risk

Required Qualifications

• Security+ or CISSP certification
• Strong communication skills with the ability to explain complex technical topics
• Strong understanding of Linux operating systems
• Availability to work extended hours and provide after‑hours and on‑call support
• Experience supporting and troubleshooting APIs and security appliances such as API gateways
• Ability to analyze system logs, performance metrics, and diagnostic data to quickly isolate technical issues
• Ability to work independently and effectively under pressure during critical production incidents

Preferred Qualifications

• Bachelor’s degree in a STEM field and 5+ years of related experience
• Experience supporting high‑availability or mission‑critical environments
• Experience with Grafana or similar monitoring tools
• Familiarity with incident management and change‑management processes
• Broad knowledge of servers, networking, storage, and virtualization
• Experience with cloud monitoring and logging tools such as Grafana, Prometheus, Promtail, and Loki
• Familiarity with DevOps collaboration tools such as Jira and Confluence