Senior Mainframe Developer

About Citi:

Citi, the leading global bank, has approximately 200 million customer accounts and does business in more than 160 countries and jurisdictions. Citi provides consumers, corporations, governments, and institutions with a broad range of financial products and services, including consumer banking and credit, corporate and investment banking, securities brokerage, transaction services, and wealth management.

As a bank with a brain and a soul, Citi creates economic value that is systemically responsible and in our clients’ best interests. As a financial institution that touches every region of the world and every sector that shapes your daily life, our Operations & Technology teams are charged with a mission that rivals any large tech company. Our technology solutions are the foundations of everything we do from keeping the bank safe, managing global resources, and providing the technical tools our workers need to be successful to designing our digital architecture and ensuring our platforms provide a first-class customer experience. We reimagine client and partner experiences to deliver excellence through secure, reliable, and efficient services.

Our commitment to diversity includes a workforce that represents the clients we serve from all walks of life, backgrounds, and origins. We foster an environment where the best people want to work. We value and demand respect for others, promote individuals based on merit, and ensure opportunities for personal development are widely available to all. Ideal candidates are innovators with well-rounded backgrounds who bring their authentic selves to work and complement our culture of delivering results with pride. If you are a problem solver who seeks passion in your work, come join us. We’ll enable growth and progress together.

The Role:

The Senior Mainframe Developer is an mid-senior level role responsible for the design, development, and ongoing support of complex mainframe and multi-platform application systems within a large-scale enterprise technology environment. Operating with a high degree of autonomy, this position plays a critical role in delivering robust software solutions that meet specific business and operational needs across the technology organization. The ideal candidate brings deep expertise in mainframe technologies, customer communications management platforms, and modern development tooling, reflecting the standards expected at leading financial institutions. This role also carries an advisory dimension, serving as a subject matter expert to stakeholders and providing mentorship to junior team members.

Responsibilities

• Participate in feasibility studies, IT planning, time and cost estimation, and risk assessment to support the establishment and implementation of new or revised application systems aligned with business requirements.
• Lead and monitor all phases of the software development lifecycle — including analysis, design, construction, testing, and implementation — while providing ongoing operational and user support post-deployment.
• Develop, maintain, and enhance applications using mainframe technologies (COBOL, JCL, DB2) and customer communication management platforms (MessagePoint and Exstream), ensuring performance, reliability, and compliance with enterprise standards.
• Analyze complex system and business process issues using in-depth applications development knowledge; evaluate industry standards and recommend advanced programming solutions and architectural improvements.
• Design and implement security measures and conduct post-implementation analysis to validate system functionality, data integrity, and adherence to regulatory and policy requirements.
• Consult with business users, clients, and cross-functional technology teams to gather requirements, define operating standards, and resolve technical issues across application environments.
• Develop and maintain Java and/or Python-based solutions in UNIX environments, contributing to automation, integration, and modernization efforts alongside core mainframe delivery.
• Utilize SDLC tooling — including Jira, RDZ, and Bitbucket — to manage code versioning, project tracking, and collaborative delivery across development teams.
• Serve as a subject matter expert and trusted advisor to senior stakeholders; mentor and coach junior analysts to build team capability and uphold engineering best practices.
• Appropriately assess and escalate risk in alignment with applicable laws, regulations, and organizational policies, demonstrating sound ethical judgment and transparency in all business and technical decisions.

Qualifications

• 4+ years of overall experience in applications development, systems analysis, and software programming within enterprise or financial services environments.
• 4+ years of hands-on mainframe development experience, including proficiency in COBOL, JCL, DB2, and associated mainframe tools (, TSO/ISPF, VSAM, CICS).
• 2+ years of experience with MessagePoint and OpenText Exstream content and composition platforms, including template development, variable data processing, and multi-channel output management.
• Hands-on experience with Java and/or Python development in UNIX/Linux environments, with familiarity in scripting, automation, or API-based integration.
• Hands-on SDLC experience utilizing tools such as Jira, RDZ, and Bitbucket for project tracking, code management, and collaborative development workflows.
• Demonstrated experience managing and delivering successful technology projects, including the ability to work under pressure and adapt to shifting requirements or deadlines.
• Working knowledge of consulting and project management methodologies, with the ability to translate business needs into technical solutions and operating standards.
• Strong analytical and evaluative judgment skills with the ability to assess complex technical and business problems and recommend sound, scalable solutions.
• Experience advising senior stakeholders and acting as a subject matter expert; ability to operate with limited supervision and exercise independent judgment.

Education

• Bachelor's degree in Computer Science, Information Technology, or a related field, or equivalent professional experience.

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

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Job Family Group:

Technology

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Job Family:

Applications Support

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Time Type:

Full time

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Primary Location:

Jacksonville Florida United States

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Primary Location Full Time Salary Range:

$87, - $130,

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 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.

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Other Relevant Skills

For complementary skills, please see above and/or contact the recruiter.

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Anticipated Posting Close Date:

May 25, 2026

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