Job Description: Mainframe Developer – Composite Reservoir Accounts
Position: Programmer – Advanced – Mainframe Developer
Work Location: 100% Remote
Position Overview
The selected candidate will develop and implement a new pooled-account structure within an existing z/OS environment. The solution will allow balances from multiple subsidiary accounts to be consolidated into a single reservoir account and redistributed based on defined sweep and allocation rules.
The candidate must have strong Enterprise COBOL, NaturalOne, JCL, Adabas, VSAM, and financial accounting systems experience. This role requires the ability to analyze complex legacy applications, modify existing production programs, and ensure accurate financial processing, reconciliation, and reporting.
Key Responsibilities
- Analyze existing account master, posting, and balance-maintenance programs to identify changes required for Composite Reservoir Accounts.
- Design, develop, and implement new account types, including account opening/closing, participant linkage, sweep and reverse-sweep processing, allocation, and interest apportionment.
- Develop and modify Enterprise COBOL programs in a z/OS mainframe environment.
- Modify batch COBOL programs and JCL to support nightly and month-end processing cycles.
- Implement financial accounting logic, including double-entry posting, balance maintenance, accruals, value dating, and reconciliation.
- Work with NaturalOne, Natural, Adabas, and VSAM technologies.
- Trace undocumented legacy application logic through copybooks, call chains, and job streams.
- Develop audit trails, exception reports, and reconciliation controls.
- Prepare test data, unit testing, regression testing, and parallel-run comparisons.
- Troubleshoot production issues and ensure accurate financial processing.
- Support implementation, data conversion, and initial production runs.
- Prepare technical documentation, data-flow diagrams, and operational runbooks.
Required Skills & Experience
- 5+ years of Enterprise COBOL development experience in a z/OS mainframe environment.
- 3+ years of Composite Reservoir Accounts (CRA) experience.
- 5+ years of experience with NaturalOne.
- 3+ years of JCL development and production support experience.
- 3+ years of financial/accounting systems development or support experience.
- 3+ years of experience working with Adabas and VSAM.
- 3+ years of experience analyzing undocumented legacy systems using copybooks, call chains, and job streams.
