Mainframe Developer

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

• 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 development or support including double-entry posting, balance/accrual maintenance, value dating, reconciliation, and month-end closeouts in a regulated environment
• 3+ years of experience working with Adabas and VSAM
• 3+ years of experience with tracing undocumented logic through copybooks, call chains, and job streams

These are the skills we expect to see evidence of in the first conversation.

• COBOL - substantial production experience in Enterprise COBOL on z/OS, both batch and online; comfortable extending large existing programs and reading code you did not write.
• NaturalOne - the Eclipse-based Software AG development environment; developing, debugging, and deploying Natural applications from it, including local development and remote z/OS projects.
• Natural and Adabas - Natural programs, subprograms, and maps; DDMs, descriptors and superdescriptors, and Adabas file design and performance behavior.
• z/OS and JCL - writing and debugging JCL, procs, GDGs, utilities, SORT, and restart/rerun handling; fluent in TSO/ISPF.
• Mainframe data stores - VSAM file design and access, and Adabas for z/OS.
• Financial accounting logic - double-entry posting, balance and accrual maintenance, value dating, reconciliation, and month-end close in a regulated environment.
• Analysis of legacy systems - tracing undocumented logic through copybooks, call chains, and job streams, and stating clearly what a change will and will not affect.

Preferred Skills

• Experience with cash management, account pooling, sweeps, or treasury applications
• Experience with CA-7 scheduling and batch operations
• Experience with REXX, Python, or Java

Not required to apply. Each of these will shorten your ramp-up, and we will support you in learning the ones you do not have.

• Mixed-estate integration - calling between COBOL and Natural, and exposing mainframe function through z/OS Connect, IBM MQ, or REST services.
• Scheduling and operations - CA-7 batch window analysis and performance tuning.
• Scripting and adjacent languages - REXX or CLIST for tooling, plus Java or Python for data comparison and migration work.
• Cash management domain - notional and physical pooling, cash concentration, sweeps, and intercompany allocation.

Additional Skills

• Track record of taking a specification from analysis through production implementation with limited supervision.
• Clear written communication: you can explain a change to an auditor, a business analyst, and another developer, and adjust the explanation for each.
• Degree in computer science or a related field, or equivalent practical experience.