Unix/Linux Support Engineer - Security Operations, Assistant Vice President

Citigroup Inc.; Tampa (FL); Hybrid; USD 87,000 - 131,000; Full time

Job summary

Citigroup Inc. seeks a Unix/Linux Support Engineer to protect critical Citi infrastructure and data within a global security operations function. You will troubleshoot incidents, drive risk assessments, and embed security controls across systems and platforms.

The role requires 5+ years in Linux/Windows administration, knowledge of security components, encryption protocols, and strong communication skills. Hybrid work in Tampa with competitive benefits is offered.

Qualifications

• 5+ years of hands-on Linux and Windows administration in an operational role.
• Knowledge of load balancers, proxies, and firewalls.
• Familiarity with SFTP, FTPS, HTTPS; encryption using TLS/SSH.
• Clear written and verbal communication across levels.
• Analytical mindset with attention to detail; multitasking ability.
• Bachelor's degree or equivalent experience.

Responsibilities

• Monitor system alerts to maintain health of critical systems.
• Troubleshoot issues, assess risk, and coordinate resolutions across systems.
• Assess change events and escalate to management when needed.
• Provide security app support across production and UAT environments; ensure stability.
• Collaborate with infra teams to meet security requirements during changes.
• Maintain and improve monitoring scripts and automation tools.

Skills

Linux/Windows OS

Network security

Protocols: SFTP/FTPS/HTTPS

TLS/SSH encryption

Communication

Bachelor's degree

Education

Bachelor's degree

Job description

Citi is looking for a Unix/Linux Support Engineer (Info Security Tech Sr Analyst - C12) to join its global security operations function, playing a central role in protecting the firm's infrastructure, applications, and data against evolving cyber threats. In this position, you will be involved in incident troubleshooting efforts, drive technical risk assessments, and ensure security controls are embedded across systems and platforms. This is an opportunity to make a measurable impact within a high-performing team operating on a global scale.

Shift Schedule:

• Shift Hours: 10:30 AM – 7:30 PM EST
• Shift Days: Sunday–Thursday or Tuesday–Saturday.

Responsibilities:

• Monitoring all system alerts to maintain health of critical systems.
• Troubleshooting various issues with clients, assessing technical risk and coordinating timely resolution across affected systems.
• Assess the risk and operational impact of all change events and system issues, escalating to technology management promptly when required.
• Provide technical application support for security infrastructure and applications across production and UAT environments, ensuring stability, capacity, and performance are actively managed.
• Collaborate with infrastructure teams to validate that operational security requirements are met during application integrations and system changes.
• Maintain and improve scripts and automation tools used for system monitoring, process efficiency, and operational continuity.

Required Qualifications & Skills:

• 5+ years of hands‑on experience in Linux and Windows operating systems, in an operational or system administration capacity.
• Working knowledge of network security components including load balancers, proxy servers, and firewalls.
• Familiarity with file transfer protocols such as SFTP, FTPS, and HTTPS, as well as encryption protocols including PGP, TLS, and SSH.
• Clear and concise written and verbal communication skills, with the ability to engage effectively across all levels of the organization.
• Analytical mindset with strong attention to detail and the ability to manage multiple tasks.
• Bachelor's degree or equivalent professional experience.

Beneficial Skills & Qualifications:

• Experience with PKI technology, certificate lifecycle management, or data encryption systems.
• Experience using monitoring or automation tools such as Tivoli, Sensu, Autosys, or ServiceNow to support operational workflows.
• Familiarity with web servers (Apache, IIS, Sun One) or application servers (WebLogic, WebSphere), along with a working understanding of database platforms such as Oracle or SQL Server.
• Scripting capability in Shell, PowerShell, SQL, or an equivalent language, applied to security operations or system automation tasks.
• Broad understanding of security architectures, network protocols, and how they interact within enterprise‑scale environments.

What We Offer:

At Citi, you will work within a collaborative, performance‑driven environment where your contributions directly support the security of one of the world's leading financial institutions. We offer a hybrid working model and a range of benefits designed to support your professional growth, wellbeing, and long‑term career development.

• Hybrid working arrangement with 3 days in the office and 2 days working remotely, providing flexibility alongside team collaboration.
• Exposure to complex, large‑scale security challenges across a global technology environment, with the opportunity to deepen your expertise across multiple security domains.
• Structured mentorship and knowledge‑sharing culture that supports continuous learning and career progression.
• Access to Citi's global network of technology and security professionals, enabling cross‑functional collaboration and broad organizational visibility.
• Wellbeing and financial support programs, alongside localized benefits tailored to your location.

Applicants must be authorized to work in the U.S for this position; Citi will not sponsor applicants for U.S. work authorization for this role.

Candidate must be located within commuting distance or be willing to relocate to the area.

This job description provides a high‑level review of the types of work performed. Other job‑related duties may be assigned as required.

Job Family Group:

Technology

Job Family:

Information Security

Time Type:

Full time

Primary Location:

Tampa Florida United States

Primary Location Full Time Salary Range:

$87,280.00 - $130,920.00

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.

Automated Processing and AI

We use automated processing, including artificial intelligence, for our legitimate business interests (or our reasonable and appropriate business purposes) to identify and align the candidate's skills and abilities with a specific job opening. Additionally, if you so choose, or consent, we can match your skills and abilities to other suitable roles at Citi.

Importantly, all our hiring processes and decisions, including determining your suitability for a role, are conducted, checked, and decided by individuals. Our automated processing and AI do not involve relying on automatic or autonomous decision‑making. Please refer to any Jurisdictional Considerations, with specific provisions for your country (where relevant) for further details.

Illinois residents – AI Notice and Right

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.