Senior Mainframe Developer

Job ID: 93639731680Posted: 2026-07-13Location: Jacksonville, Florida, United StatesSalary: $113,840.00 - $170,760.00Category: Technology, Applications Development, ProfessionalCompany: CitiThe 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 improvementsResolve variety of high impact problems/projects through in-depth evaluation of complex business processes, system processes, and industry standardsProvide expertise in area and advanced knowledge of applications programming and ensure application design adheres to the overall architecture blueprintUtilize advanced knowledge of system flow and develop standards for coding, testing, debugging, and implementationDevelop comprehensive knowledge of how areas of business, such as architecture and infrastructure, integrate to accomplish business goalsProvide in-depth analysis with interpretive thinking to define issues and develop innovative solutionsServe as advisor or coach to mid-level developers and analysts, allocating work as necessaryAppropriately 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, DB22+ years experience using AI tools such as Devin AI and CoPilot.Extensive experience system analysis and in programming of software applicationsExperience in managing and implementing successful projectsSubject Matter Expert (SME) in at least one area of Applications DevelopmentAbility to adjust priorities quickly as circumstances dictateDemonstrated leadership and project management skillsConsistently demonstrates clear and concise written and verbal communicationEducation:Bachelor’s degree/University degree or equivalent experienceMaster’s degree preferredThis 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:Applications Development------------------------------------------------------Time Type:Full time------------------------------------------------------Primary Location:Jacksonville Florida United States------------------------------------------------------Primary Location Full Time Salary Range:$113,840.00 - $170,760.00In 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.------------------------------------------------------Most Relevant Skills Please see the requirements listed above.------------------------------------------------------Other Relevant Skills For complementary skills, please see above and/or contact the recruiter.------------------------------------------------------Anticipated Posting Close Date:Jun 15, 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.