Senior Mainframe Developer

Citigroup
Full-time
Jacksonville, Florida, United States, Irving, Texas, United States
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Posted April 6, 2026

Job Description

Job Overview The Senior Mainframe Developer is a senior level position responsible for establishing and implementing new or revised application systems and programs in coordination with the Technology team. The overall objective of this role is to lead applications systems analysis and programming activities.

Responsibilities: Partner with multiple management teams to ensure appropriate integration of functions to meet goals as well as identify and define necessary system enhancements to deploy new products and process improvements

Resolve variety of high impact problems/projects through in-depth evaluation of complex business processes, system processes, and industry standards

Provide expertise in area and advanced knowledge of applications programming and ensure application design adheres to the overall architecture blueprint

Utilize advanced knowledge of system flow and develop standards for coding, testing, debugging, and implementation

Develop comprehensive knowledge of how areas of business, such as architecture and infrastructure, integrate to accomplish business goals

Provide in-depth analysis with interpretive thinking to define issues and develop innovative solutions

Serve as advisor or coach to mid-level developers and analysts, allocating work as necessary

Appropriately assess risk when business decisions are made, demonstrating particular consideration for the firm's reputation and safeguarding Citigroup, its clients and assets, by driving compliance with applicable laws, rules and regulations, adhering to Policy, applying sound ethical judgment regarding personal behavior, conduct and business practices, and escalating, managing and reporting control issues with transparency.

Recommended Qualifications: 5 + years in IBM mainframe development.

Need experience with developing batch and online programs in Cobol.

Experience with IBM utilities and other mainframe tools and data structures such as Fileaid, Rexx, JCL, CICS, Changeman, Github, Expediter, TSO/ISPF, VSAM, DB2

2+ years experience using AI tools such as Devin AI and CoPilot.

Extensive experience system analysis and in programming of software applications

Experience in managing and implementing successful projects

Subject Matter Expert (SME) in at least one area of Applications Development

Ability to adjust priorities quickly as circumstances dictate

Demonstrated leadership and project management skills

Consistently demonstrates clear and concise written and verbal communication

Education: Bachelor’s degree/University degree or equivalent experience

Master’s degree preferred

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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Requirements & Skills

Qualifications: 5 + years in IBM mainframe development.

Need experience with developing batch and online programs in Cobol.

Experience with IBM utilities and other mainframe tools and data structures such as Fileaid, Rexx, JCL, CICS, Changeman, Github, Expediter, TSO/ISPF, VSAM, DB2

2+ years experience using AI tools such as Devin AI and CoPilot.

Extensive experience system analysis and in programming of software applications

Experience in managing and implementing successful projects

Subject Matter Expert (SME) in at least one area of Applications Development

Ability to adjust priorities quickly as circumstances dictate

Demonstrated leadership and project management skills

Consistently demonstrates clear and concise written and verbal communication

How to Apply

Apply directly through the application link above