Senior Mainframe Developer and Analyst with 40+ Years' Experience

John Hennigan

Senior Mainframe Developer / Programmer Analyst

Chicago, IL

***********@***.*** 708-***-****

Professional Summary

Senior Mainframe Developer with over 40 years of experience supporting and enhancing mission-critical insurance and financial systems. Deep expertise in COBOL, DB2, CICS, IMS, VSAM, and JCL within high-volume batch and online environments. Proven strength in production support, legacy system maintenance, data conversions, and performance tuning. Known for strong analytical skills, effective troubleshooting, and delivering stable, reliable solutions in regulated, high-availability environments.

Core Mainframe Skills

Languages: COBOL, COBOL II, SQL, JCL, REXX

Online / Transaction Processing: CICS, IMS DC

Databases & Storage: DB2, IMS DB, VSAM

Batch & Utilities: JCL, IBM Utilities

Messaging & Integration: MQ Series, NDM, FTP, TCP/IP

Tools: Endevor, File-AID, QMF, SPUFI, Expediter, Intertest

Platforms: IBM z/OS (MVS), TSO/ISPF

Professional Experience

DXC Technology – Mainframe Programmer

Burns Harbor, IN December 2021 – Present - Provide ongoing production support and maintenance for large-scale COBOL/IMS/DB2 mainframe applications

- Support both batch and online processing in a high-availability environment

- Analyze, code, test, and implement enhancements and defect fixes

- Process and implement Change Requests using ServiceNow

- Collaborate with business and technical teams to ensure system stability and reliability

Hope Enrichment Center – Mainframe Programmer / Billing Associate

Palos Heights, IL November 2015 – Present - Support and maintain legacy COBOL/CICS/DB2 mainframe applications

- Assist with analysis and resolution of production issues

- Perform billing and collections functions within a healthcare environment

- Coordinate with providers, clients, and insurance companies

Metra – Senior Programmer Analyst (Contract)

Chicago, IL September 2014 – September 2015 - Designed, developed, documented, and supported mainframe and PC-based applications

- Analyzed business requirements and implemented system enhancements

- Coded, tested, and maintained programs across batch and online environments

- Produced ad-hoc queries and reports and assisted users with system operations

HCSC (Blue Cross Blue Shield of Illinois) – Mainframe Developer

Chicago, IL 2006 – 2013 (multiple engagements) - Performed analysis, design, and development for mission-critical insurance applications

- Led VSAM-to-DB2 data conversion initiatives, including ETL processing and validation

- Supported real-time claim adjudication and estimate subsystems (CICS/MQ/DB2)

- Tuned DB2 performance, isolation levels, and partitioning strategies

- Supported major system releases, environment setup, testing, and implementation

- Provided production support and troubleshooting across multiple platforms

Sungard Institutional Brokerage – Software Developer

Chicago, IL February 2004 – December 2005 - Supported and enhanced a high-volume transaction network using COBOL II, CICS, VSAM, and MQ Series

- Maintained batch and online processing systems supporting automated trade routing

- Coordinated development efforts with offshore programming teams

Ciber Inc. – Consultant

Chicago, IL May 2003 – November 2003 - Provided mainframe application support for billing systems

- Performed analysis, design, and development for billing enhancements using COBOL II and DB2

CNA Insurance Company – Project Leader / Programmer Analyst

Chicago, IL February 1981 – April 2002 - Led commercial policy renewal system conversion from batch processing to real-time architecture

- Managed a team of up to 10 developers and coordinated with vendors and business users

- Designed and implemented large-scale data conversions and online processing solutions

- Provided full production support, system enhancements, and user training

- Delivered project status reporting, budgeting, and customer communication

Education & Certifications

C# Programmer & Web Developer Certificate, Moraine Valley Community College

HIAA Certification

Coursework: Database Design, SQL, C#.NET, HTML/CSS

Additional Training

Project Planning and Management

Cost Benefit Analysis

SQL Application Programming

CICS Command-Level Coding

IMS DLI & DC Programming

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