Remote Mainframe Developer — COBOL/Natural & Financial Ops

InterSources Inc.

Columbia (SC)

Remote

USD 100,000 - 180,000

Full time

1 hour ago

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Benefits offered by this job

Remote work

Job summary

InterSources Inc. in Columbia, SC is seeking an experienced COBOL mainframe developer for a 6-month remote assignment. You will analyze existing COBOL programs, design Composite Reservoir Accounts, and enhance batch processing to support nightly and month-end financial processing.

The role requires 5+ years in Enterprise COBOL on z/OS, NaturalOne, JCL, Adabas/VSAM, and strong debugging of legacy logic. Remote work with virtual interviews offered; candidate will maintain documentation and assist

Qualifications

5+ years of Enterprise COBOL development experience in a z/OS environment.
5+ years of NaturalOne experience.
5+ years of JCL development and production support.
3+ years in financial/accounting systems development or support, including double-entry posting, balance and accrual maintenance, value dating, reconciliation, and month-end closeouts in a regulated environment.
3+ years with Adabas and VSAM.
3+ years tracing undocumented legacy logic through copybooks, call chains, and job streams.
Experience with cash management, account pooling, sweeps, or treasury applications.
Experience with CA-7 scheduling and batch operations.
Experience with REXX, Python, or Java.
Experience integrating COBOL and Natural applications using z/OS Connect, IBM MQ, or REST services.
Knowledge of CLIST scripting, batch performance tuning, and data migration.

Responsibilities

Analyze existing COBOL programs, account master files, posting processes, and balance-maintenance logic to identify required enhancements.
Design and develop Composite Reservoir Accounts, including account structures, participant linkage, cash sweeps, reverse sweeps, and interest allocation.
Enhance COBOL batch programs, Natural applications, and JCL to support nightly and month-end financial processing.
Implement accurate financial posting, balance calculations, accrual processing, reconciliation, and audit controls.
Troubleshoot existing mainframe applications by tracing COBOL copybooks, program call chains, and JCL job streams.
Develop test data and perform unit testing, regression testing, and parallel-run validation against existing production results.
Investigate processing discrepancies and ensure financial accuracy without affecting existing account balances.
Support production deployment, account conversion, batch execution, and post-implementation troubleshooting.
Maintain technical documentation, data-flow diagrams, operational runbooks, and change-control records.