Senior Mainframe COBOL & Natural Developer (z/OS)

BuzzClan; Columbia (SC); On-site; USD 120,000 - 150,000; Full time

Job summary

BuzzClan seeks an experienced mainframe developer with 5+ years in Enterprise COBOL on z/OS (batch and online) and strong expertise in NaturalOne. The role includes working with Natural/Adabas, JCL, and mainframe data stores to support financial applications in a regulated environment.

The ideal candidate will trace legacy logic, contribute to production support, and communicate clearly with auditors and developers. Strong problem-solving and documentation skills are required.

Qualifications

• 5+ years of Enterprise COBOL development on z/OS, in batch and online environments.
• 5+ years of experience with NaturalOne in Eclipse-based development.
• 3+ years of JCL development and production support.
• 3+ years of experience with financial/accounting systems including double-entry posting and month-end close in a regulated environment.
• 3+ years of experience with Adabas and VSAM.
• 3+ years tracing undocumented logic through copybooks, call chains, and job streams.

Skills

COBOL

Natural

JCL

Financial accounting logic

Adabas & VSAM

Legacy systems analysis

Documentation & communication

Education

Degree in computer science or related field

Tools

NaturalOne

Natural & Adabas

z/OS

JCL utilities (GDGs, procs)

REXX

Python

Java

Job description

BuzzClan seeks an experienced mainframe developer with 5+ years in Enterprise COBOL on z/OS (batch and online) and strong expertise in NaturalOne. The role includes working with Natural/Adabas, JCL, and mainframe data stores to support financial applications in a regulated environment.

The ideal candidate will trace legacy logic, contribute to production support, and communicate clearly with auditors and developers. Strong problem-solving and documentation skills are required.