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# 100% Remote - Urgently require - Mainframe Developer (COBOL / NaturalOne / Adabas) - Only W2.

- **Company:** Sita Consulting Services
- **Location:** United States (Remote available)
- **Experience:** Experienced
- **Contract:** Contract
- **Skills:** Java (Programming Language), Accounting Systems, Adaptable Database Systems, Business Logic, Audit Trail, Unit Testing, Batch Processing, COBOL (Programming Language), Data Flow Control, Job Control Language (JCL), IBM WebSphere MQ, Rexx (Programming Language), Python (Programming Language), Mainframes, Regression Testing, Test Data, Virtual Storage Access Methods, Z/OS
- **Published:** October 31, 2026
- **Apply:** https://www.dice.com/job-detail/ed7aa3b6-c039-41e6-bd39-df7ce61ef705

## About the Role

* 15+ years of Mainframe Background experience.
 * 5+ years of Enterprise COBOL development experience in a z/OS environment.
 * 5+ years of experience with NaturalOne.
 * 3+ years of JCL development and production support experience.
 * 3+ years of experience with financial/accounting systems involving:
 + Double-entry posting
 + Accrual and balance maintenance
 + Reconciliation
 + Month-end processing
 * 3+ years of experience with Adabas and VSAM.
 * Experience tracing and documenting undocumented legacy business logic through copybooks, call chains, and job streams.

Preferred Qualifications

 * Experience with treasury systems, cash management, account pooling, or sweep processing.
 * Knowledge of CA-7 scheduling and batch operations.
 * Experience with REXX, Python, or Java.
 * Exposure to z/OS Connect, IBM MQ, or REST-based integrations.
 * Strong understanding of financial reconciliation and regulatory compliance processes.

## Description

We are seeking an experienced Mainframe Developer to enhance and support a mission-critical financial accounting platform running on IBM z/OS. The selected consultant will work on expanding existing core accounting functionality by implementing new pooled-account structures, modifying legacy applications, and ensuring accurate financial processing, reconciliation, and reporting.

This role requires strong expertise in Enterprise COBOL, Natural/NaturalOne, Adabas, VSAM, JCL, and financial systems operating in highly regulated environments. The ideal candidate should be comfortable analyzing large, complex legacy codebases and implementing enhancements with minimal supervision.
Key Responsibilities

 * Analyze existing account management, posting, and balance-maintenance programs.
 * Design and develop new account-processing functionality within an existing mainframe system.
 * Enhance COBOL programs, JCL jobs, and batch processes while maintaining system performance.
 * Implement reconciliation, audit trail, exception reporting, and accounting controls.
 * Create test data, unit tests, regression tests, and parallel-run validation comparisons.
 * Support deployments, production rollouts, and post-implementation activities.
 * Produce technical documentation, data-flow diagrams, and operational runbooks.