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# Mainframe Developer

- **Company:** Stellar Professionals
- **Location:** Columbia, SC, United States (Remote available)
- **Experience:** Experienced
- **Contract:** Contract
- **Skills:** Java (Programming Language), Adaptable Database Systems, COBOL (Programming Language), Data Stores, Eclipse (Software), Data Flow Control, Job Control Language (JCL), IBM WebSphere MQ, Rexx (Programming Language), Python (Programming Language), Mainframes, Regression Testing, Virtual Storage Access Methods, Z/OS, Tso/ispf
- **Published:** November 14, 2026
- **Apply:** https://www.dice.com/job-detail/9538bee8-9394-411c-9230-175121338b44

## About the Role

* Enterprise COBOL (z/OS): 5+ Years (Batch and online production development)
 * NaturalOne & Natural/Adabas: 5+ Years (Software AG Eclipse IDE, DDMs, descriptors/superdescriptors, file performance)
 * JCL & z/OS Utilities: 3-5 Years (Procs, GDGs, SORT, restart/rerun handling, TSO/ISPF)
 * Mainframe Data Stores: 3+ Years (VSAM file design/access and Adabas)
 * Financial Accounting Systems: 3+ Years (Double-entry posting, accruals, value dating, month-end closeouts)
 * Composite Reservoir Accounts: 3+ Years (Pooled accounts, sweep and allocation structures)
 * Legacy Analysis: 3+ Years (Tracing undocumented logic across copybooks, call chains, and job streams)
 * Preferred Skills: Cash management/treasury pooling, CA-7 scheduling, REXX/Python/Java, z/OS Connect, or IBM MQ.

Must-Have Constraints

 * Must physically reside in the Continental United States (Lower 48 states) and work EST hours.
 * Must have verifiable hands-on experience with Composite Reservoir Accounts (3+ years).

## Description

100% Remote contract role to design, build, and integrate a new pooled-account structure (Composite Reservoir Accounts) into an existing z/OS mainframe accounting platform. You will extend legacy COBOL and Natural/Adabas applications so that subsidiary account balances concentrate and sweep accurately while maintaining strict double-entry posting, accrual, and audit traceability., * Legacy Code & Batch Modification: Analyze lightly documented COBOL/Natural codebases; modify batch COBOL programs and JCL to support nightly and month-end processing within existing batch windows.

 * Controls & Reconciliation: Build audit trails, exception reporting, and reconciliation controls; run parallel comparisons against production output to ensure zero penny discrepancies.
 * Documentation & Support: Produce unit/regression test packs, data-flow notes, and runbook updates, providing on-call cover during early-life production cycles.