Mainframe Developer- Programmer

The South Carolina State Treasurer's Office is seeking an experienced Mainframe Developer to build a new Composite Reservoir Account (CRA) structure within an existing z/OS core accounting system without disrupting current account balances. The role involves analyzing and extending a large, established COBOL production system to support the new account type, including posting, settlement, accruals, reporting, and reconciliation. Accuracy, traceability, and financial integrity are critical.

Responsibilities

• Analyze existing account master, posting, and balance-maintenance programs to identify where composite reservoir accounts must be incorporated.
• Design and develop the new account type, including master file structures, account opening and closing, participant linkage, sweep/reverse-sweep logic, allocation, interest apportionment, and closing balance calculations.
• Modify batch COBOL programs and JCL and extend nightly and month-end processing cycles.
• Implement audit trails, exception reporting, and reconciliation controls.
• Develop test data, unit and regression test packs, and parallel-run comparisons against production output.
• Support implementation, account conversion, and early-life production runs, including on-call support during initial cycles.
• Prepare program documentation, data-flow notes, and runbook updates.

Required Skills

• Enterprise COBOL development in a z/OS environment: 5+ Years
• NaturalOne experience: 5+ Years
• JCL development and production support: 5+ Years
• Financial/accounting systems development or support: 3+ Years
• Experience working with Adabas and VSAM: 3+ Years
• Tracing undocumented logic through copybooks, call chains, and job streams: 3+ Years

Preferred Skills

• Cash management, account pooling, sweeps, or treasury applications: Preferred
• CA-7 scheduling and batch operations: Preferred
• REXX, Python, or Java: Preferred

Technical Expertise Expected During Interview

• COBOL: Strong production experience with Enterprise COBOL on z/OS, including batch and online development, extending large existing programs, and understanding legacy code.
• NaturalOne: Experience using the Eclipse-based Software AG development environment to develop, debug, and deploy Natural applications.
• Natural and Adabas: Natural programs, subprograms, maps, DDMs, descriptors, superdescriptors, and Adabas file design and performance.
• z/OS and JCL: Writing and debugging JCL, procedures, GDGs, utilities, SORT, restart/rerun handling, and TSO/ISPF.
• Mainframe Data Stores: VSAM file design and access, and Adabas for z/OS.
• Financial Accounting Logic: Double-entry posting, balance and accrual maintenance, value dating, reconciliation, and month-end close in a regulated environment.
• Legacy System Analysis: Tracing undocumented logic through copybooks, call chains, and job streams and identifying the impact of proposed changes.

Additional Qualifications

• Ability to take a specification from analysis through production implementation with limited supervision.
• Strong written communication skills, including explaining technical changes to auditors, business analysts, and developers.
• Bachelor's degree in Computer Science or a related field, or equivalent practical experience.