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Senior Linux System Administrator Vice President

https://www.citi.com/ Logo

Citi

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Location:
United States , Irving, Texas

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Category:
IT - Administration

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Contract Type:
Not provided

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Salary:

125760.00 - 188640.00 USD / Year
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Job Description:

We are seeking an accomplished and technically astute Level 3 Linux System Administrator to join our high-performance infrastructure team. This individual will serve as a subject matter expert (SME) on Linux systems, providing deep operational insight, advanced troubleshooting, performance tuning and capacity planning. Demonstrate a strong balance on hands-on expertise, automation mindset, and a strategic approach to system scalability, security, and lifecycle management.

Job Responsibility:

  • Deliver expert-level support and resolution for complex incidents and problems within the Linux ecosystem, ensuring minimal business impact and adherence to SLAs
  • Troubleshoot and resolve escalated issues in the Linux Environment
  • Proactively monitor system health, performance and capacity to ensure stability, availability and reliability
  • Perform Kernel Upgrade, patches and Vulnerability Management to ensure compliance meeting the organization standards
  • Design and enforce system hardening, access control, and security baselines aligned with the compliance framework
  • Server as escalation point and technical advisor for Level 1 and 2 administrators, develop technical runbooks and knowledge-based articles
  • Participate and lead initiatives for architectural reviews, infrastructure modernization, and enterprise risk assessments
  • Lead Major Incidents and engage with stake holders to perform Root Cause Analysis and provide permanent solutions

Requirements:

  • 8+ years of progressive experience in Linux Server Administration with enterprise level skills in Physical and virtual environment management
  • Deep Understanding of Linux security methodologies, Hardening procedure and best practices
  • Deep Understanding of Linux Internals – Process Management, Memory handling. Kernel Tuning, Capacity planning
  • Evaluate and maintain server storage and other IT standards for the enterprise and all supporting products and services
  • Hands on Experience with automation tools (Ansible, Chef, Puppet)
  • Analyze server and storage characteristics (e.g., CPU behavior latency transmission speeds packet loss and throughput) triage and troubleshoot problems. Knowledge and experience of Root Cause Analysis (RCA) required
  • Familiarity with complex multi-site and global network design multi-layered switch environment firewalls VPN Load balancers and DNS
  • Familiar with the fundamentals of web application and relational database architectures
  • Bachelor's/University degree in Computer Science/Engineering preferred or equivalent experience

Nice to have:

  • Knowledge and writing a code and script (Shell, Python. Perl, Yaml, and / or PHP) is a huge plus
  • Knowledge with analytics and observability tools (Grafana, Kibana, Elk, Splunk, AppDynamics) is a plus
  • Experience with container technologies (docker, Kubernetes, openShift, AWS, GCP)
What we offer:
  • medical, dental & vision coverage
  • 401(k)
  • life, accident, and disability insurance
  • wellness programs
  • paid time off packages, including planned time off (vacation), unplanned time off (sick leave), and paid holidays
  • discretionary and formulaic incentive and retention awards

Additional Information:

Job Posted:
February 02, 2026

Expiration:
February 06, 2026

Employment Type:
Fulltime
Work Type:
Hybrid work
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