Principe Mainframe z/OS Engineer

Arthur Grand Technologies Inc•Jersey City, NJ

15h•Hybrid

About The Position

This role is for a Principal-level Mainframe z/OS Engineer to take end-to-end ownership of critical trading, valuation, and fund accounting platforms. These systems directly support portfolio valuation, financial reporting, and regulatory obligations where accuracy and reliability are non-negotiable. This role involves designing and managing core financial processing logic across the end-to-end trade lifecycle (capture through settlement), fund accounting and investment book of record, daily/monthly NAV computation and financial close, and audit replay, historical restatement, and regulatory correction workflows. The ideal candidate brings deep domain expertise in capital markets, strong batch engineering capabilities, and a track record of delivering highly accurate, high-volume financial systems under strict regulatory oversight.

Requirements

18+ years of hands-on mainframe application development (strict)
Operating at Lead / Architect / Principal level
Experience handling Production issues, Batch failures, Data discrepancies, and Financial accuracy
Advanced expertise in Enterprise COBOL (high-precision financial calculations, packed decimal handling)
Advanced expertise in DB2 for z/OS (complex SQL tuning, performance engineering)
Advanced expertise in CICS TS and/or IMS TM transaction processing
Advanced expertise in JCL, PROCs, and enterprise batch processing frameworks
Strong experience across trading and post-trade processing systems
Strong experience across investment accounting and fund administration platforms
Strong experience across NAV calculation and valuation engines
Demonstrated ownership of production-critical financial applications
Expertise in accounting close cycles and NAV processing
Expertise in reconciliation workflows and break resolution
Expertise in corporate actions lifecycle management
Expertise in multi-currency valuation and FX rate application
Experience with scheduling and deployment tools: Control-M, CA-7, or Tivoli Workload Scheduler
Experience with Endevor, Changeman (or similar SCM tools)
Hands-on exposure to audit replay and historical data restatement frameworks
Hands-on exposure to large-scale asset manager or custodian environments

Responsibilities

Lead the architecture and development of Enterprise COBOL applications supporting trade capture, settlement, and lifecycle processing, position, holdings, and cash accounting systems, and daily, monthly, and ad-hoc NAV calculations.
Take full ownership of financial accuracy and data integrity across systems.
Design and implement restartable, checkpoint-driven batch frameworks for financial close processes, including multi-currency valuation and FX conversions, income accruals, amortization, and distribution calculations, and corporate actions such as dividends, splits, and mergers.
Build systems capable of reprocessing historical data for audit, reconciliation, and regulatory corrections.
Troubleshoot and resolve NAV breaks and accounting discrepancies within strict reporting deadlines.
Design and optimize DB2 data models for high-volume trade, position, and pricing datasets, and historical valuation and reporting data.
Perform advanced performance engineering, including EXPLAIN plan analysis, access path tuning, and index strategy optimization.
Address production challenges including locking issues, batch overruns, and data skew.
Develop scalable batch processing solutions with parallel execution capabilities for EOD/EOM cycles.
Optimize COBOL programs for performance, focusing on CPU utilization, I/O efficiency, and consistent processing windows.
Build and maintain integration layers using IBM MQ for trade and pricing feeds, market data ingestion, and downstream accounting and reporting systems.
Deliver data feeds for risk management systems and regulatory reporting platforms.
Support API enablement initiatives via z/OS Connect EE.
Act as the technical owner for high-impact financial components and lead root-cause investigations for financial inconsistencies, reconciliation breaks, and batch and online processing failures.
Support SOX, SEC, and internal audits by ensuring complete traceability and replay capability of financial processing logic.