Senior Linux System Administrator, Citi

Citi

Location:
United States, Irving

Category:
IT - Administration

Contract Type:
Not provided

Salary:

Not provided

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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
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
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).

Nice to have:

Knowledge and writing a code and script (Shell, Python, Perl, Yaml, and / or PHP)
Knowledge with analytics and observability tools (Grafana, Kibana, Elk, Splunk, AppDynamics)
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 vacation, sick leave, and paid holidays.

Additional Information:

Job Posted:
November 14, 2025

Employment Type:

Fulltime

Work Type:

Hybrid work

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Senior Linux System Administrator