[Hiring] Senior Mainframe COBOL Developer @Cynet Systems

Role Description

The organization is adding new composite reservoir accounts to its 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 role involves reading a large body of legacy COBOL code and extending it so that the new account type posts, settles, accrues, reports, and reconciles exactly as existing types do. Correctness and traceability of every cent are paramount for this role.

Responsibilities

• Analyze the current account master, posting, and balance-maintenance programs to establish where composite reservoir accounts must be recognized, and document what is found.
• 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 composite reservoir accounts 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 coverage during the first cycles.
• Produce program documentation, data-flow notes, and runbook updates that the support team can work from.

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 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 tracing undocumented logic through copybooks, call chains, and job streams.
• Substantial production experience in Enterprise COBOL on z/OS, both batch and online, with demonstrated capability extending large existing programs and reading code written by others.
• Experience developing, debugging, and deploying Natural applications from NaturalOne (the Eclipse-based Software AG development environment), including local development and remote z/OS projects.
• Proficiency with Natural programs, subprograms, and maps, as well as DDMs, descriptors, superdescriptors, and Adabas file design and performance behavior.
• Hands-on experience writing and debugging JCL, procs, GDGs, utilities, SORT, restart/rerun handling, and working within TSO/ISPF.
• Experience with mainframe data stores, including VSAM file design and access, and Adabas for z/OS.
• Demonstrated ability to trace undocumented logic through copybooks, call chains, and job streams, accurately determining change impact.

Preferred Skills

• Experience with cash management, account pooling, sweeps, or treasury applications.
• Experience with CA-7 scheduling and batch operations, including batch window analysis and performance tuning.
• Experience with REXX, CLIST, Python, or Java for tooling, data comparison, and migration work.
• Experience with mixed-estate integration, such as calling between COBOL and Natural, and exposing mainframe functions through z/OS Connect, IBM MQ, or REST services.
• Domain knowledge in cash management, including notional and physical pooling, cash concentration, sweeps, and intercompany allocation.

Additional Qualifications

• Track record of taking a specification from analysis through production implementation with limited supervision.
• Strong verbal and written communication skills with the ability to communicate effectively with stakeholders, auditors, business analysts, and developers.
• Degree in Computer Science or a related field, or equivalent practical experience.