Mainframe Lead Developer (COBOL/JCL)
Resume:
THENMOZHI JEYAKUMAR
516-***-**** ***********@*****.*** linkedin.com/in/thenmozhi-j-278bb0251
Mainframe Lead Developer
PROFESSIONAL SUMMARY
• 15+ years of IT experience developing and maintaining batch and online processing systems in the IBM Mainframe environment, spanning application development, production support, testing, conversion, migration, and enhancement using Agile methodology.
• Strong domain knowledge across Banking, Financial, Capital Markets, Trading, Health Care, and Retail.
• Partners closely with customers, business analysts, and cross-functional teams to translate business requirements into quality technical solutions.
• Deep technical expertise in COBOL, JCL, DB2, Stored Procedures, IMS/DB, Teradata, CICS, mainframe API enablement, MQ Services, Ezytrieve, ChangeMan, Endevor, Jenkins, REXX, File-Aid, File-Manager, and CI/CD practices.
• Skilled with Jira, ServiceNow, TSO/ISPF, SPUFI, QMF, SyncSort, JCL, NDM, FTP/SFTP, EDM (Edifecs & Axway), and IBM utilities.
• Creates and maintains mainframe execution JCL to support system replacement projects across UAT and Production.
• Strong problem-solver with a passion for clean, efficient architecture; evaluates and recommends cost-effective enhancements that improve performance, reliability, and business value.
• Works closely with business stakeholders, product owners, and enterprise architects; translates business requirements into technical architecture.
• Supports estimation, planning, and delivery governance, and mentors junior and mid-level engineers.
• Certified SAFe Scrum Master (valid through January 2026). TECHNICAL SKILLS
Platforms Z/390, Z/OS
Languages COBOL, JCL, Ezytrieve
Databases DB2, IMS-DB, Teradata, VSAM
Transaction
Processing
CICS, API Services
Tools & Utilities File-Aid, ChangeMan, Xpeditor, Endevor, FTP, NDM, CA-7, EDM, Edifecs & Axway, ServiceNow, IBM Utilities
EDUCATION
Bachelor's Degree in Computer Science and Engineering — University of Madras, Chennai (2000) PROFESSIONAL EXPERIENCE
Blue Cross Blue Shield of Texas
Mainframe Lead Developer (COBOL, JCL, VSAM, DB2, Endevor, CA-7, Control-M) Remote Jan 2025 – Current
• Provided maintenance, enhancement, and incident-fix support for medical cross-over and reverse eligibility of members.
• Delivered COBOL, DB2, and CICS program changes; used CICS APIs for sending/receiving messages with front-end systems.
• Built and maintained JCLs, PROCs, and related control cards (SORT, DFSORT, and other IBM utilities).
• Worked closely with business stakeholders, product owners, and enterprise architects.
• Documented impact analysis for all components in a SPEC and led SME review calls for SPEC sign-off.
• Performed code changes and unit testing, then participated in SIT, UAT, and implementation.
• Handled coding, testing, and user sign-off through implementation, including fixes for medical cross-over issues.
• Provided rotational production support to maintain, monitor, and support batch processing operations. Blue Cross Blue Shield of Texas
Senior Mainframe Developer (COBOL, JCL, VSAM, DB2, CICS, Endevor) Remote May 2024 – Jul 2024
• Worked on an Agile team to analyze system components and implement changes to differentiate USPS clients.
• Documented impact analysis in a SPEC and led SME review calls for sign-off.
• Assessed the impact and logic required to add USPS customers to existing insurance policies.
• Authored SPEC logic describing how to segregate USPS and non-USPS clients. CIGNA (Express Scripts)
Senior Developer (JCL, DB2, Stored Procedures, API, Teradata, PostgreSQL, Jenkins, Jira, CA-7 & Control-M) Remote Oct 2022 – Jan 2024
• Maintained and enhanced P360 member data and claims management using Teradata, DB2, and JCL.
• Managed DB2/Teradata data creation, storage, maintenance, and updates feeding calculated data into HC360.
• Supported the data flow from DB2 (patient info, claims processing, adherence) through Teradata to the HC360 front end.
• Worked end-to-end in an Agile model: effort estimation, requirements analysis, development, testing, and implementation.
• Partnered with QA on SIT/UAT environments and moved components through the SDLC using Endevor and Jenkins.
• Created and scheduled batch jobs using CA-7; supported pre- and post-implementation activities.
• Provided rotational production support for batch processing operations. TATA CONSULTANCY SERVICES
2005 – 2018
Client: Royal Bank of Scotland
Mainframe SIT Team Lead (COBOL, JCL, IMS-DB, VSAM, CICS, DB2) India Jan 2017 – Apr 2018
• Led the SIT support team for incident fixes and batch cycle monitoring.
• Guided the team in resolving COBOL, DB2, JCL, and VSAM errors, including authorization and storage issues.
• Coached the team on fixing common COBOL, IMS-DB, and DB2 batch errors such as unique index violations, cursor handling, and deadlocks.
• Advised on key database practices including authorization, restart/checkpoint, and image copies.
• Closed open tickets on time with proper solutions and documented new fixes for future reference. Client: CITI ITO
Tech Lead (COBOL, JCL, VSAM, DB2, TWS, CICS, File-Aid, ChangeMan, Jira) India Jan 2013 – Dec 2016
• Led full SDLC delivery — requirements gathering, analysis, coding, testing, implementation, and UAT — for wealth management and corporate actions (dividends, bonus, futures & options).
• Coordinated with onsite-offshore teams to analyze project requirements.
• Prepared and presented technical requirement documents, securing approval from architects and SMEs.
• Performed coding, unit testing, SIT, and UAT for assigned tasks.
• Tracked project status for peers across SDLC phases through user sign-off and post-implementation.
• Conducted peer reviews of code changes and unit test results.
• Scheduled jobs via TWS (daily/weekly cycles) and managed dependencies
(predecessor/successor/triggers/file receipt).
• Monitored batch job execution and updated job streams as required; reported project progress to the Delivery Manager.
Client: Morgan Stanley & Smith Barney
Onsite Coordinator (COBOL, JCL, VSAM, DB2, File-Aid, ChangeMan, Jira) New York, USA Jan 2012 – Dec 2012
• Led discussions with SMEs to analyze project requirements and provided impact analysis and estimation.
• Made code changes, prepared unit test plans, and tested new/modified programs.
• Reviewed and tested programs developed by other team members; participated in SIT and UAT.
• Created RAPS ad-hoc reports using Ezytrieve.
• Coordinated with offshore teams on requirements, test plans, and query resolution. Client: CITI-CMB
Lead and Onsite Coordinator (COBOL, JCL, VSAM, IMS-DB, DB2, File-Aid, Endevor, Omegamon for IMS, Jira) Jersey City, USA Jan 2008 – Dec 2012
• Analyzed project requirements across all SAL-BONY applications with SMEs.
• Helped prepare technical design documents for clearing and settlement processes with BONY and DTCC.
• Provided impact analysis and estimation; developed unit test plans and tested new/modified programs.
• Coordinated system integration testing across teams and led user acceptance testing.
• Partnered with offshore teams on requirements, test plans, and issue resolution.
• Coordinated major projects including Collateral Protection, HIC Allocation, and Chase Phase 1.
• Served as SAL-BONY module lead (Mar 2011 – Aug 2011), tracking onsite-offshore project status and ensuring on-time delivery.
Client: Lehman Brothers
Mainframe Developer (COBOL, JCL, DB2, Ezytrieve, File-Aid, CICS, VSAM, Panvalet, Xpeditor) India Jan 2007 – Dec 2007
• Prepared low-level design for various functionalities and developed/tested programs for re-written functionality.
• Incorporated enhancements and analyzed the system for further improvement.
• Participated in peer reviews and led knowledge-sharing sessions on the client system. Client: Merrill Lynch
Mainframe Developer (COBOL, JCL, VSAM, File-Aid, Endevor, CICS, DB2, Xpeditor) India Jul 2005 – Dec 2006
• Prepared low-level design for various functionality and developed/tested re-written programs.
• Incorporated and analyzed enhancements to the system.
• Tested programs developed by other team members.
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