Mainframe Developer

Job Title: Mainframe Developer – Composite Reservoir Accounts (CRA)Interview Process: 1-2 Rounds of Virtual InterviewsDuration of the Contract: 6 MonthsPossibility for Extension: Yes, if the project needs warrant an extension.Work Location: 100% Remote and comfortable working EST time zone hours.Note: Client need Candiate who can work on W2 tax term.Work Environment: IBM Mainframe / z/OSJob SummaryThe developer will work within an established IBM z/OS environment, analyzing and extending legacy Enterprise COBOL and Natural applications to support composite reservoir accounts.

The solution will enable balances from multiple subsidiary accounts to be consolidated into and distributed from a central reservoir account through defined sweep, reverse-sweep, and allocation rules. This role requires strong hands-on experience in Enterprise COBOL, NaturalOne, Natural, Adabas, VSAM, and JCL, along with a solid understanding of financial accounting processes. The ideal candidate will be comfortable analyzing large, existing applications, tracing undocumented business logic, and delivering reliable production changes without disrupting existing account balances or processing cycles.Required Qualifications & Skills

• Hands-on experience in Enterprise COBOL development within an IBM z/OS mainframe environment.
• Experience with NaturalOne, the Eclipse-based Software AG development environment.
• Experience developing and supporting JCL, including procedures, GDGs, utilities, SORT, and restart/recovery processing.
• Experience supporting or developing financial/accounting applications, including:o Double-entry accounting and posting.o Account balance and accrual maintenance.o Value dating.o Financial reconciliation.o Month-end closing processes.
• Hands-on experience working with Adabas and VSAM.
• Experience developing and debugging Natural programs, subprograms, and maps.
• Knowledge of Adabas file design, DDMs, descriptors, and superdescriptors.
• Strong understanding of TSO/ISPF and IBM z/OS mainframe operations.
• Experience analyzing and tracing undocumented legacy application logic through copybooks, program call chains, and batch job streams.
• Ability to modify large, established production applications while maintaining data integrity and existing business functionality.Preferred Qualifications
• Experience with treasury applications, cash management, account pooling, or financial account management systems.
• Knowledge of notional pooling, physical pooling, cash concentration, account sweeps, and intercompany allocation.
• Experience with CA-7 scheduling, batch operations, and batch-window performance optimization.
• Experience with REXX, CLIST, Python, or Java.
• Experience integrating COBOL and Natural applications.
• Familiarity with IBM MQ, REST services, or z/OS Connect.
• Experience with data migration, financial data validation, and automated comparison tools.