Mainframe Developer

VIVA USA Inc; United States; Remote; USD 120,000 - 180,000; Full time

Job summary

VIVA USA Inc. is seeking a senior Mainframe Developer to extend a legacy COBOL-based accounting platform with a new pooled-account structure.

You will design master and table structures, ensure correct posting, accrual, and reconciliation, and integrate the new account type within existing batch and reporting cycles. You will read extensive COBOL, adapt it to support composites, and maintain strict accuracy and traceability of every cent.

Qualifications

• 5+ years of Enterprise COBOL development in a z/OS environment.
• 5+ years with NaturalOne in batch/online contexts.
• 3+ years JCL development and production support.
• 3+ years in financial/accounting systems with double-entry posting.
• 3+ years with Adabas and VSAM.
• 3+ years tracing undocumented logic through copybooks and job streams.

Responsibilities

• Analyze current account master, posting, and balance-maintenance programs to identify where composite reservoir accounts must be recognized.
• Design and code the new account type end to end: master file and table structures, opening/closing, and linkage.
• Modify batch COBOL programs and JCL; extend nightly and month-end cycles without extending batch windows.
• Add CRAs to audit, exception reporting, and reconciliation controls in collaboration with accounting stakeholders.
• Produce test data, unit and regression packs, and run parallel comparisons to production output.
• Support implementation, account conversions, production runs, and on-call coverage during initial cycles.
• Leave behind documentation, data-flow notes, and runbook updates for the support team.

Skills

COBOL Enterprise

NaturalOne

JCL

Adabas

VSAM

Trace legacy code

Education

CS degree or equivalent

Tools

JCL

TSO/ISPF

Mainframe utilities

Job description

Candidate must reside in lower 48 states (Continental US) and comfortable working EST time zone hours.

The client is looking for a Programmer - Advanced - Mainframe Developer - Composite Reservoir Accounts

Mainframe Developer - Composite Reservoir Accounts

Build a new pooled-account structure inside a running z/OS core, without disturbing the balances already on it.

About The Role

We are adding new composite reservoir accounts to our existing mainframe accounting platform: a pooled account structure in which balances from multiple subsidiary accounts are concentrated into, and drawn back from, a single reservoir account under defined sweep and allocation rules.

This is additional function inside a legacy system. You will be reading a large body of COBOL that has been in production for an extended period, much of it lightly documented, and extending it so that the new account type posts, settles, accrues, reports, and reconciles exactly as the existing types do. Correctness and traceability of every cent matter more than speed of delivery.

What You Will Do

• Analyze the current account master, posting, and balance-maintenance programs to establish where composite reservoir accounts must be recognized, and document what you find.
• Design and code the new account type end to end: master file and table structures, account opening and closing, participant linkage, sweep and reverse-sweep logic, allocation and interest apportionment, and closing balance derivation.
• Modify batch COBOL programs and JCL and extend the nightly and month-end cycles to include the new processing without lengthening the batch window beyond agreed limits.
• Add new CRAs to the audit trail, exception reporting, and reconciliation controls the new function requires, working with accounting stakeholders on what must be evidenced.
• Produce test data, unit and regression test packs, and parallel-run comparisons against current production output; investigate every difference until it is explained.
• Support implementation, conversion of any in-scope existing accounts, and early-life production runs, including on-call cover during the first cycles.
• Leave behind program documentation, data-flow notes, and runbook updates that the support team can work from.

Required Skills

• 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
• 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.

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.

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.

How We Work

Production changes follow formal change control with peer review and a signed-off implementation plan.

Notes

100% Remote

VIVA is an equal opportunity employer. All qualified applicants have an equal opportunity for placement, and all employees have an equal opportunity to develop on the job. This means that VIVA will not discriminate against any employee or qualified applicant on the basis of race, color, religion, sex, sexual orientation, gender identity, national origin, disability or protected veteran status