Senior Mainframe COBOL/Natural Developer

HTC Global Services; Columbia Township (MO); On-site; USD 110,000 - 140,000; Full time

Benefits offered by this job

Group Health (Medical, Dental, and Vis

401(k) matching

Paid Time Off

Professional Development opportunities

Job summary

HTC Global Services is seeking a Senior Mainframe COBOL/Natural Developer to enhance a critical mainframe accounting platform on z/OS. You will extend Enterprise COBOL and Natural applications, implement financial accounting functionality, and ensure accurate processing, reconciliation, and reporting.

You will navigate complex legacy code, trace undocumented logic, and deliver reliable enhancements with minimal production impact.

Qualifications

• 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.
• 3+ years of experience with financial/accounting systems development or support.
• 3+ years of experience with Adabas and VSAM.
• 3+ years of tracing undocumented logic through copybooks, call chains, and job streams.

Responsibilities

• Analyze existing account master, posting, and balance-maintenance programs to identify where new account functionality must be incorporated and document findings.
• Design and develop new account functionality, including master file and table structures, account opening and closing, participant linkage, sweep and reverse-sweep logic, allocation, interest apportionment, and closing balance derivation.
• Modify batch COBOL programs and JCL and extend nightly and month-end processing cycles while maintaining agreed batch-window limits.
• Enhance audit trails, exception reporting, and reconciliation controls in coordination with accounting stakeholders.
• Develop test data, unit and regression test packs, and parallel-run comparisons against current production output.
• Investigate and explain differences identified during testing.
• Support implementation, conversion of in-scope existing accounts, and early-life production runs, including on-call support during initial cycles.
• Prepare program documentation, data-flow notes, and runbook updates for ongoing production support.

Skills

Enterprise COBOL

NaturalOne

JCL

Financial/accounting systems

Adabas/VSAM

Undocumented logic tracing

Education

Bachelor's degree in Computer Science or related field

Tools

CA-7

REXX

Python

Java

Job description

HTC Global Services is seeking a Senior Mainframe COBOL/Natural Developer to enhance a critical mainframe accounting platform on z/OS. You will extend Enterprise COBOL and Natural applications, implement financial accounting functionality, and ensure accurate processing, reconciliation, and reporting.

You will navigate complex legacy code, trace undocumented logic, and deliver reliable enhancements with minimal production impact.