IT - STO - Programmer - Advanced - Mainframe Developer - Composite Reservoir Accounts

Job Title

Mainframe Developer – Composite Reservoir Accounts (REMOTE)

Client

Office of the State Treasurer

Location

100% Remote – Candidates must reside in the Continental US (Lower 48 States) and be comfortable working EST hours. South Carolina residency is not required.

Educational Qualification

Bachelor's degree in Computer Science or a related field, or equivalent practical experience.

Position Type

Contract – 6 Months (Possibility of extension based on project needs)

Interview Process

1–2 Rounds of Virtual Interviews

Must Have Skills

• 5+ years of Enterprise COBOL development experience in z/OS environments, including batch and online applications.
• 5+ years of experience with NaturalOne for developing, debugging, and deploying Natural applications.
• 3+ years of JCL development and production support experience, including PROCs, GDGs, SORT utilities, and restart/rerun procedures.
• 3+ years of experience developing or supporting financial/accounting systems in regulated environments.
• 3+ years of hands-on experience with Adabas and VSAM file structures, design, and data access.
• 3+ years of experience analyzing undocumented legacy mainframe logic through COBOL copybooks, program call chains, and batch job streams.
• Strong knowledge of Natural programming, subprograms, maps, DDMs, descriptors, and superdescriptors.
• Experience with double-entry accounting, financial posting, balance maintenance, accrual calculations, value dating, reconciliation, and month-end processing.
• Proficiency in TSO/ISPF and troubleshooting production mainframe applications.
• Ability to modify and enhance complex legacy COBOL applications while maintaining data integrity and system stability.

Desired Skills

• Experience with treasury management, cash pooling, composite reservoir accounts, cash concentration, and automated sweep processing.
• Knowledge of CA-7 scheduling, batch operations, batch window optimization, and performance tuning.
• Experience integrating COBOL and Natural applications.
• Familiarity with z/OS Connect, IBM MQ, REST APIs, and mainframe integration technologies.
• Experience with REXX, CLIST, Python, or Java for automation, data comparison, and migration activities.
• Understanding of notional and physical cash pooling, intercompany allocations, and interest apportionment.
• Experience implementing financial system enhancements under formal change control procedures.
• Strong analytical, problem-solving, technical documentation, and stakeholder communication skills.
• Ability to independently manage development activities from requirements analysis through production deployment.

Job Responsibilities

• Analyze existing COBOL account master, transaction posting, and balance maintenance programs to identify enhancements required for composite reservoir accounts.
• Design, develop, and implement composite reservoir account functionality within an existing z/OS mainframe accounting platform.
• Develop and modify account master files, database structures, account opening and closing processes, and participant account relationships.
• Implement automated sweep and reverse-sweep processing, fund allocation rules, interest apportionment, and closing balance calculations.
• Enhance batch COBOL programs, Natural applications, and JCL procedures to support new account processing requirements.
• Integrate new functionality into nightly and month-end batch cycles while maintaining established processing windows.
• Ensure accurate financial posting, settlement, accrual processing, reporting, and reconciliation across composite reservoir accounts.
• Develop audit trails, exception reports, reconciliation controls, and transaction traceability mechanisms to meet regulatory and accounting requirements.
• Collaborate with accounting teams, business analysts, and technical stakeholders to validate financial processing rules and control requirements.
• Prepare comprehensive test data, unit tests, regression tests, and parallel-run comparisons against existing production results.
• Investigate and resolve processing discrepancies to ensure financial accuracy and prevent unintended impacts on existing account balances.
• Support account conversion, production implementation, deployment validation, and post-implementation stabilization.
• Provide production support and on-call assistance during initial batch processing and month-end cycles.
• Prepare and maintain technical documentation, program specifications, data-flow diagrams, operational procedures, and support runbooks.
• Follow formal change management processes, including peer reviews, impact assessments, and approved implementation plans.
• Ensure all system enhancements maintain financial data integrity, auditability, regulatory compliance, and operational reliability.