THIRUNERE CHELVAN R

Senior Mainframe Developer

https://www.opentalent.in/thirunere-chelvan-r

Key Strengths

Deep expertise in core mainframe technologies: COBOL, JCL, DB2, CICS, VSAM, and IMS.
Proven track record in performance optimization, including batch processing, SQL tuning, and JCL optimization, with quantifiable results (e.g., 40% improvement in batch performance).
Extensive experience in production support, incident management, root cause analysis (RCA), and implementing permanent fixes, reducing MTTR by 30%.
Proficiency with a wide array of mainframe tools and utilities: schedulers (CA-7, Control-M, TWS), SCM (Endevor, Changeman), debuggers (Abend-AID, Xpediter), and file utilities (File-AID, IDCAMS).
Strong background in critical domains like payroll and financial transaction processing, including regulatory enhancements and zero-downtime migrations.

AI is analyzing your overall score…

Identifying your key strengths…

Evaluating your skill match against the job requirements…

Assessing your cultural and operational fit

About

Senior Software Engineer / Senior Mainframe Developer and Production Support Engineer with 4.7+ years of experience in IBM z/OS application development, batch support, incident management, performance tuning, and regulatory release delivery across enterprise payroll, retail, and financial systems. Strong hands-on expertise in COBOL, JCL, DB2, SQL, CICS, VSAM, IMS, REXX, Endevor, File-AID, Abend-AID, Xpediter, CA-7, Control-M, and RACF. Improved batch performance by 40%, reduced manual support effort by 50%, cut incident resolution time by 30%, and delivered zero-downtime production releases with strong SLA and audit discipline.

Top Skills

COBOLJCLSplunkSQL

Education

Vidya Vahini College

Bachelor of Computer Applications (BCA) · Computer Science

August 1, 2018 – June 30, 2021

Vidya Vahini Pre-University College

Higher Secondary Certificate (HSC) · Science Stream

June 1, 2016 – May 31, 2018

Experience

Sopra Steria India Limited

Senior Software Engineer - Mainframe Developer and Production Support

October 1, 2021 – Present

Bengaluru, Karnataka, India

Projects

Enterprise Payroll Mainframe Modernization and Support

October 1, 2021 – May 1, 2026

Enhanced and supported enterprise payroll and financial transaction applications covering batch processing, online transactions, report generation, data validation, incident resolution, and release delivery. Improved batch performance by 40%, reduced manual effort by 50%, and cut production issue resolution time by 30% through automation, SQL tuning, JCL optimization, and permanent defect fixes.

Master Dump Enhancement - Tesco

October 1, 2021 – May 1, 2026

Re-designed VSAM file-processing logic and COBOL record layouts, eliminated redundant I/O, streamlined JCL PROC chains, and improved high-volume master-dump processing throughput by 40%.

ZELLIS Migration and Integration

October 1, 2021 – May 1, 2026

Supported zero-downtime migration and integration by coordinating CICS cutovers, DB2/IMS validation, data-integrity checks, RACF access controls, and automated compliance verification using REXX.

Unipay Production Support and Enhancements

October 1, 2021 – May 1, 2026

Delivered payroll regulatory enhancements and production support fixes across batch and online modules, achieving 100% on-time release delivery and reducing Tier-2/Tier-3 incident resolution time by 30%.

Certifications

Generative AI Fundamentals

Databricks

May 1, 2026 – Present

Python and Data Analytics

GUVI Geek Networks

May 1, 2026 – Present

Advanced Microsoft Office and Excel

GUVI Geek Networks

May 1, 2026 – Present

Project Management Professional

G Learning

May 1, 2026 – Present

Key Strengths

Deep expertise in core mainframe technologies: COBOL, JCL, DB2, CICS, VSAM, and IMS.
Proven track record in performance optimization, including batch processing, SQL tuning, and JCL optimization, with quantifiable results (e.g., 40% improvement in batch performance).
Extensive experience in production support, incident management, root cause analysis (RCA), and implementing permanent fixes, reducing MTTR by 30%.
Proficiency with a wide array of mainframe tools and utilities: schedulers (CA-7, Control-M, TWS), SCM (Endevor, Changeman), debuggers (Abend-AID, Xpediter), and file utilities (File-AID, IDCAMS).
Strong background in critical domains like payroll and financial transaction processing, including regulatory enhancements and zero-downtime migrations.

Cultural & Operational Fit

Cultural Fit Analysis

The candidate exhibits a strong cultural fit for a Senior Mainframe Developer role, given their extensive and specialized experience directly aligning with the target position. Their professional projects showcase a comprehensive understanding of the mainframe ecosystem, covering development, modernization, and critical production support. The quantifiable impact metrics demonstrate a commitment to efficiency and operational excellence. While certifications like 'Generative AI Fundamentals' and 'Python and Data Analytics' are not directly mainframe-related, they indicate a proactive approach to continuous learning and broader technical awareness, which is a positive trait for adaptability and growth within an organization.

Soft Skills & Operational Fit

The candidate demonstrates strong problem-solving abilities through incident resolution and performance tuning. Their experience in automating tasks with REXX highlights an efficiency-driven mindset. Collaboration with onshore teams, QA, and business users indicates good teamwork and stakeholder management. A focus on audit compliance, security, and structured release processes reflects a disciplined and responsible operational approach. The quantifiable achievements underscore a results-oriented and proactive work ethic.