Job Overview:
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.
Responsibilities:
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.
Skills & Qualifications
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
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).
Education:
Bachelor's/University degree in Computer Science/Engineering preferred or equivalent experience
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Job Family Group:
Technology------------------------------------------------------
Job Family:
Infrastructure------------------------------------------------------
Time Type:
Full time------------------------------------------------------
Primary Location:
Irving Texas United States------------------------------------------------------
Primary Location Full Time Salary Range:
$125,760.00 - $188,640.00
In addition to salary, Citi’s offerings may also include, for eligible employees, discretionary and formulaic incentive and retention awards. Citi offers competitive employee benefits, including: medical, dental & vision coverage; 401(k); life, accident, and disability insurance; and wellness programs. Citi also offers paid time off packages, including planned time off (vacation), unplanned time off (sick leave), and paid holidays. For additional information regarding Citi employee benefits, please visit citibenefits.com. Available offerings may vary by jurisdiction, job level, and date of hire.
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Most Relevant Skills
Please see the requirements listed above.------------------------------------------------------
Other Relevant Skills
Kubernetes, Linux Programming, Linux Server Administration, Linux System Administration, Linux Systems Programming, Python (Programming Language), Red Hat Ansible, Red Hat OpenShift.------------------------------------------------------
Anticipated Posting Close Date:
Apr 21, 2026------------------------------------------------------
Citi is an equal opportunity employer, and qualified candidates will receive consideration without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other characteristic protected by law.
If you are a person with a disability and need a reasonable accommodation to use our search tools and/or apply for a career opportunity review Accessibility at Citi.
View Citi’s EEO Policy Statement and the Know Your Rights poster.
Skills Required
- 8+ years of experience in Linux Server Administration
- Deep understanding of Linux security methodologies
- Experience with automation tools such as Ansible, Chef, Puppet
- Knowledge of scripting languages including Shell, Python, Perl, Yaml, PHP
- Experience with container technologies (docker, Kubernetes, OpenShift, AWS, GCP)
Citi Compensation & Benefits Highlights
The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Citi and has not been reviewed or approved by Citi.
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Healthcare Strength — Benefits coverage is positioned as comprehensive, including health, dental, and vision insurance plus on-site clinics, prescription drug support, and disability coverage. Family-building support such as fertility assistance is described as a notable differentiator within the overall package.
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Retirement Support — Retirement benefits are framed as strong, highlighted by a 401(k) with matching and additional plan options like a Roth 401(k). Financial support is reinforced through discounts and broader financial guidance resources tied to the benefits ecosystem.
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Wellbeing & Lifestyle Benefits — Wellbeing support extends beyond insurance through programs like an Employee Assistance Program, counseling/legal resources, and gym or wellness reimbursement. These offerings increase the perceived total rewards value even when cash compensation sentiment varies by role.
Citi Insights
What We Do
Citi's mission is to serve as a trusted partner to our clients by responsibly providing financial services that enable growth and economic progress. Our core activities are safeguarding assets, lending money, making payments and accessing the capital markets on behalf of our clients. We have 200 years of experience helping our clients meet the world's toughest challenges and embrace its greatest opportunities. We are Citi, the global bank – an institution connecting millions of people across hundreds of countries and cities.
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