Mainframe Developer / Senior Developer
Job description
This is a developer / senior developer position for a skilled Mainframe Developer to design, develop, maintain, and optimize mainframe legacy Banking applications. The ideal candidate should have hands-on experience with COBOL, JCL, VSAM/DB2, and CICS, along with a deep understanding of batch and online processing. The role involves collaborating with cross-functional teams to ensure efficient, scalable, and secure mainframe systems that support critical business functions.
Key Responsibilities
- Design, develop, test, and maintain mainframe applications using COBOL, JCL, VSAM, DB2, and CICS with Mainframe tools and utilities.
- Analyze system requirements and create high-level and low-level technical documents.
- Optimize mainframe application performance and troubleshoot issues.
- Work with batch processing systems and scheduling tools like TWS/CA-7.
- Develop and maintain database objects VSAM/DB2.
- Collaborate with business analysts, system architects, and quality assurance teams.
Required Skillsets
Core Mainframe Technologies
- COBOL structured programming
- JCL (Job Control Language)
- CICS (Transaction management, BMS, pseudo-conversational programming)
- Very Good knowledge in CICSPlex development and configuration standards
- VSAM (KSDS, ESDS, RRDS datasets) or DB2 (SQL queries, performance tuning)
Development Tools & Utilities:
- TSO/ISPF (Time Sharing Option/Interactive System Productivity Facility)
- File-AID (Data analysis and manipulation)
- COBOL Debugging tool – i.e. IBM DEBUG
- Abend-AID (Dump analysis and debugging)
- IBM Mainframe utilities (IEBGENER, SORT, IDCAMS, etc.)
- Backup utilities (IBM-ADRDSSU/FAVER)
- File Transmission (Connect Direct – NDM/Network Data Mover)
- Batch Scheduling tools (TWS/CA-7)
Integration/Security
- FIS(Systematics) online framework (TBR/ICR/TCR)
- WebSphere MQ (Messaging and inter-system communication)
- CICS MRO (Multi-region operation – CICS to CICS communication)
- APIs (JSON/REST/SOAP integrations with mainframes via z/OS connect)
- RACF (Resource Access Control Facility)
Soft Skills & Other Considerations:
- Strong analytical and problem-solving skills both batch and online
- Strong skills to understand legacy application/architecture and identify impact of proposed changes
- Well versed in DevOps practices for mainframe CI/CD pipeline (Bitbucket/Git/Changeman)
- Experience / working knowledge of FIS-Systematics banking solution will have an advantage
- Domain knowledge of Banking and Financial services industry
- Effective communication and documentation abilities
- Experience in Agile or Waterfall methodologies
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Job Family Group:
Technology------------------------------------------------------
Job Family:
Applications Development------------------------------------------------------
Time Type:
Full time------------------------------------------------------
Citi is an equal opportunity and affirmative action employer.
Qualified applicants will receive consideration without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or status as a protected veteran.
Citigroup Inc. and its subsidiaries ("Citi”) invite all qualified interested applicants to apply for career opportunities. 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.
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