Citigroup, Inc

Senior Mainframe Developer

Citigroup, Inc$87K — $130K *
Enterprise Technology
Less than 5 years of experience
Job Overview by Ladders

Qualifications

  • 4+ years of applications development experience in enterprise or financial services environments.
  • 4+ years of mainframe development experience, with proficiency in COBOL, JCL, DB2, and mainframe tools like TSO/ISPF.
  • 2+ years experience with MessagePoint and OpenText Exstream platforms, focusing on template development and multi-channel output.
  • Hands-on Java and/or Python experience in UNIX/Linux environments, with skills in scripting and automation.
  • Experience managing and delivering technology projects under pressure, adapting to changing requirements.
  • Strong analytical skills for evaluating complex technical and business problems and presenting scalable solutions.
  • Consulting experience and ability to translate business needs into technical solutions.

Responsibilities

  • Participate in feasibility studies, planning and risk assessments for new application system implementations.
  • Lead all phases of the software development lifecycle, ensuring successful software delivery and user support post-deployment.
  • Develop and enhance applications using mainframe technologies and communication platforms, prioritizing performance and compliance.
  • Analyze complex systems and recommend advanced programming solutions and improvements based on industry standards.
  • Design security measures and conduct post-implementation analysis to ensure data integrity and regulatory adherence.
  • Consult with stakeholders to gather requirements and resolve cross-functional technical issues.
  • Develop UNIX-based Java/Python solutions to support automation and modernization efforts within mainframe delivery.

Benefits

  • Medical, dental, and vision coverage
  • 401(k) plan
  • Life, accident, and disability insurance
  • Wellness programs availability
  • Paid time off including vacation, sick leave, and holidays
Full Job Description
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 (e.g., 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.

Job Family Group:
Technology

Job Family:
Applications Support

Time Type:
Full time

Primary Location:
Jacksonville 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.

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:
May 25, 2026

About Citigroup, Inc

Citigroup is a financial services holding company that provides financial products and services. The company operates through two segments, Global Consumer Banking (GCB) and Institutional Clients Group (ICG). The GCB segment offers traditional banking services to retail customers through retail banking, commercial banking, Citi-branded cards, and Citi retail services. The ICG segment offers various banking, and financial products and services to corporate, institutional, public sector, and high-net-worth clients. This segment provides wholesale banking products and services, including fixed-income and equity sales and trading, foreign exchange, prime brokerage, derivative services, equity and fixed-income research, corporate lending, investment banking, and advisory services, private banking, cash management, trade finance, and securities services. Citi is committed to sustainability and social responsibility, and the company invests in initiatives that promote economic progress.

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Learn more about Citigroup, Inc
Market Cap
$1.3 billion
Industry
Net Income
$89.6 million
Founded
1812
5 Year Trend
+4.6%
NASDAQ

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