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I am a Senior QA and Mainframe Tester with 13+ years of experience across Banking, Retail, and Healthcare domains. I specialize in mainframe technologies (COBOL, JCL, CICS, DB2, VSAM, TSO/ISPF) and have a proven track record delivering offshore QA testing and end-to-end release validation in z/OS environments. I thrive on collaborating with cross-functional teams to ensure high-quality software releases and robust regression coverage. I enjoy building reliable testing strategies, automating repetitive checks, and mentoring teammates to improve QA practices. Outside of project work, I stay curious about emerging testing tools and techniques to continuously enhance test efficiency and product quality.…I am a Senior QA and Mainframe Tester with 13+ years of experience across Banking, Retail, and Healthcare domains. I specialize in mainframe technologies (COBOL, JCL, CICS, DB2, VSAM, TSO/ISPF) and have a proven track record delivering offshore QA testing and end-to-end release validation in z/OS environments. I thrive on collaborating with cross-functional teams to ensure high-quality software releases and robust regression coverage. I enjoy building reliable testing strategies, automating repetitive checks, and mentoring teammates to improve QA practices. Outside of project work, I stay curious about emerging testing tools and techniques to continuously enhance test efficiency and product quality.

Nandhini Muthamilselvan

QA Engineer, Programmer, Web Developer, +2

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I am a Senior QA and Mainframe Tester with 13+ years of experience across Banking, Retail, and Healthcare domains. I specialize in mainframe technologies (COBOL, JCL, CICS, DB2, VSAM, TSO/ISPF) and have a proven track record delivering offshore QA testing and end-to-end release validation in z/OS environments. I thrive on collaborating with cross-functional teams to ensure high-quality software releases and robust regression coverage. I enjoy building reliable testing strategies, automating repetitive checks, and mentoring teammates to improve QA practices. Outside of project work, I stay curious about emerging testing tools and techniques to continuously enhance test efficiency and product quality.…I am a Senior QA and Mainframe Tester with 13+ years of experience across Banking, Retail, and Healthcare domains. I specialize in mainframe technologies (COBOL, JCL, CICS, DB2, VSAM, TSO/ISPF) and have a proven track record delivering offshore QA testing and end-to-end release validation in z/OS environments. I thrive on collaborating with cross-functional teams to ensure high-quality software releases and robust regression coverage. I enjoy building reliable testing strategies, automating repetitive checks, and mentoring teammates to improve QA practices. Outside of project work, I stay curious about emerging testing tools and techniques to continuously enhance test efficiency and product quality.

Available to hire

I am a Senior QA and Mainframe Tester with 13+ years of experience across Banking, Retail, and Healthcare domains. I specialize in mainframe technologies (COBOL, JCL, CICS, DB2, VSAM, TSO/ISPF) and have a proven track record delivering offshore QA testing and end-to-end release validation in z/OS environments. I thrive on collaborating with cross-functional teams to ensure high-quality software releases and robust regression coverage.

I enjoy building reliable testing strategies, automating repetitive checks, and mentoring teammates to improve QA practices. Outside of project work, I stay curious about emerging testing tools and techniques to continuously enhance test efficiency and product quality.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

English

Fluent

Work Experience

Lead Engineer (Testing) at FIS Global Business Solutions

January 1, 2021 - Present

Led regression testing for Laser UK credit card management system, ensuring full coverage of critical functionalities and identifying 15+ high-priority defects. Tested Base2000, a mainframe credit card processing software, for reliability and performance across issuing and acquiring functions. Developed a web-based GUI for Service View used by 100+ users to access mainframe customer service functions. Led offshore QA team and managed end-to-end testing delivery for mainframe credit card processing systems. Performed regression testing for COBOL and CICS-based credit card transaction programs. Validated batch processing using JCL in z/OS via TSO/ISPF. Executed DB2 validation using SQL. Developed regression automation scripts using ATR. Worked with ChangeMan ZMF for mainframe code migration and release validation. Coordinated release testing and deployment validation activities. Prepared QA metrics, testing reports, and project status documentation.

Senior QA Engineer at Troy Software India Pvt Ltd

January 1, 2017 - January 1, 2021

RPOS is a complete solution for all retailers. Analyzed business requirements and created detailed test scenarios and test cases. Conducted functional, system, and regression testing for 5 retail POS modules, improving software reliability and user satisfaction. Executed backend database validation using SQL queries. Performed validation of batch processing outputs using COBOL and DB2, ensuring data consistency and reducing discrepancies. Reported and tracked over 100 defects monthly using JIRA, ensuring timely resolution and quality assurance. Collaborated with development teams to diagnose and resolve defects in COBOL applications. Prepared test execution and defect summary reports.

Senior QA Engineer at Troy Software India Pvt Ltd

January 1, 2015 - January 1, 2017

Led enhancements in Behavior Scoring to improve verification accuracy of over 1,000 customer transactions monthly with TARGO Bank and other financial institutions. Collaborated with cross-functional teams to implement SDLC best practices, ensuring structured development and deployment processes. Conducted estimation and created comprehensive Unit Test plans, ensuring thorough testing of developed functionalities for reliability and accuracy. Participated in banking application testing for consumer loan and auto finance systems. Developed detailed unit test plans and test scenarios, resulting in improved test coverage. Performed integration testing and backend data validation. Maintained test documentation and QA artifacts.

System Engineer at Tata Consultancy Services

January 1, 2013 - January 1, 2015

Home Depot project: Created detailed test plans, scenarios, and test cases for banking software applications, ensuring thorough coverage aligned with business requirements. Executed functional, sanity, and regression testing on 50+ enterprise applications on z/OS, identifying over 200 defects and achieving a 98% quality rate in releases for Banking and Healthcare sectors. Validated user registration and transaction processing workflows for web applications, ensuring accurate backend data processing using SQL and Java. Supported production deployments and coordinated with onsite teams.

Assistant System Engineer at Tata Consultancy Services

January 1, 2011 - January 1, 2013

Kaiser Permanente project: Performed manual testing on 150+ test cases and integration testing for healthcare applications using JIRA and HP ALM. Prepared test cases, test data, and test execution reports. Participated in test strategy and test case review sessions. Generated QA metrics, defect reports, and test closure reports. Ensured testing activities met organizational QA standards.