Sabarigiri Chandrasekaran
Irving,TX
Summary
Mainframe Technical Lead / On-Site Coordinator with 17+ years of experience in enterprise mainframe application development, maintenance, modernization and production support within financial services. Extensive hands-on expertise in COBOL, JCL, CICS, DB2, VSAM, REXX and z/OS. Experienced in mainframe DevOps/CI/CD using GitHub and Jenkins, REST API integration/testing, DB2 performance troubleshooting, Agile delivery and technical leadership of onsite/offshore teams.
Overview
17
17
years of professional experience
Work History
Mainframe Technical lead /On-Site Coordinator
Citi cards Collection
Irving, USA
07.2024 - Current
- Promoted GitHub Copilot adoption to enhance productivity and accelerate code development.
- Integrated GitHub Copilot into workflows, reducing development time significantly.
- Utilized AI-powered tools like GitHub Copilot to improve productivity and code quality.
- Implemented DevOps practices for mainframe lifecycle using GitHub and Jenkins.
- Demonstrated strong proficiency in COBOL, CICS, DB2, and JCL for application support.
- Conducted end-to-end API testing with Postman for CICS/COBOL REST services.
- Analyzed and resolved DB2 production issues, including SQLCODE errors and deadlocks.
- Managed development activities through JIRA, ensuring timely updates and issue resolution.
Mainframe Technical lead
Citi cards Collection
Chennai, India
03.2020 - 06.2024
- Automated recovery business process and upgraded technology for enhanced performance.
- Developed application monitoring system for credit balance write-off accounts, improving financial oversight.
- Utilized hybrid agile methodology to facilitate application development processes.
- Maintained various small applications to streamline recovery-related operations, boosting efficiency.
- Oversaw daily activities, ensuring task completion and project status reporting.
- Employed Jira for sprint planning, story point estimation, task assignments, and defect tracking.
- Managed development activities through Jira to ensure timely updates and effective coordination.
- Performed end-to-end API testing using Postman for CICS/COBOL REST services.
Mainframe Technical lead/On-Site Coordinator
Citi cards Collection
Irving, USA
02.2014 - 02.2020
- Automated credit card collection offer management to enhance efficiency.
- Utilized traditional waterfall model for structured application development.
- Coordinated daily onsite activities, ensuring seamless operations across multiple projects.
- Employed File-Aid for VSAM sequential file and DB2 data analysis, validation, and troubleshooting.
- Maintained knowledge of Software Development Life Cycle (SDLC) principles for software design.
- Performed data lookup, record verification, test data creation, and correction for COBOL CICS applications.
- Managed application components including COBOL, JCL, CICS, DB2 across all environments.
- Facilitated requirement gathering with business teams to align project goals.
Mainframe Developer
Citi cards Collection
Chennai, India
04.2009 - 01.2014
- Developed new application to encapsulate triad decision engine for accessibility by various lines of business.
- Oversaw management of COBOL, JCL, CICS, DB2 components across all environments including development and production.
- Conducted data analysis using File-Aid for VSAM and DB2 during development and testing phases.
- Managed mainframe source code with Serena ChangeMan for version control and deployment processes.
- Executed data verification tasks including record lookups and file comparisons to support COBOL and batch applications.
- Analyzed system functionality through enhancement requests leading to effective coding and testing implementations.
- Created REXX utility for improved efficiency in daily operations while generating comprehensive test cases for enhancements.
- Engaged in user acceptance testing alongside business users to validate system performance prior to rollout.
Education
Bachelor of Science (BSc) -
SASTRA University
Thanjavur, Tamil Nadu, IndiaMCA -
SASTRA University
Thanjavur, Tamil Nadu, IndiaSkills
COBOL
JCL
CICS
DB2
VSAM
Mainframe Development
API Development
REXX
File-Aid
Postman
GitHub Copilot
Change Man
TSO/ISPF
Visual Basic
Python
DYL280
Transaction Management
DevOps Practices
Scrum Practices
JIRA
RTC
RDZ
SPUFI
Service Now
Bitbucket
GIT
Eclipse
CDIR
SAR
Card lifecycle
Notable Process Improvements
- Code Tuning, Saved around 100K$. Tuned high-MIPS consuming jobs. Provided simplified approach for the COBOL codes having complex steps. Moved jobs to weekend to utilize green zone time for MIPS saving.
- Automation, Automated the process taking more manual effort. Automated rule table process using Excel and Cobol. Developed and enhanced REXX tools to assist team in day-to-day activity. Created framework to upload reports online to handle Credit balance write off, Risk and Fraud using Unix, Cobol and Java.
Technical Highlights
COBOL, JCL, CICS, REXX, DYL280, SAS, Visual Basic, Java, Restful API, Python, Natural, DB2, VSAM, Change Man, HP Quality Center, TSO/ISPF, File-Aid, ALM, SAR, HP Quality Center, IBM Utilities like Sync sort, JIRA, RTC, RDZ (IBM Developer for z/OS (IDz)), SPUFI, Service Now, Postman, Eclipse, Bit bucket, GIT, CDIR (Connect Direct), Git Hub Copilot (coding assistance), Excel, PowerPoint, Word, Visio, Jira (Basic), Credit Card Life Cycle, Cards Acquisition, Payments, Credit Balance Write Off, Brand Conversion
Roles And Responsibilities
- Involving in various stages of SDLC – Requirement Analysis, Design, Coding, Unit Testing, User Acceptance Testing, Implementation and Post Implementation Support
- Led development and maintenance activities for enterprise mainframe applications using COBOL, JCL, CICS, and DB2 technologies.
- Develop application standards and controls to ensure every system’s projects function effectively perform all varied applications as well as operating system.
- Always follow the defined standards in code development process.
- Provide prime assistance toward application release installation into production under given direction.
- Co-Ordinate and involve in structured peer reviews and walkthrough with customers.
- Shouldering overall responsibilities to understand client process and work efficiently to meet targets and deliver solutions in accordance with quality control standards, Business practices and procedures.
- Interact with different system and vendors to integrate system infrastructure.
- Project documentation and performing audit.
Timeline
Mainframe Technical lead /On-Site Coordinator
Citi cards Collection
07.2024 - Current
Mainframe Technical lead
Citi cards Collection
03.2020 - 06.2024
Mainframe Technical lead/On-Site Coordinator
Citi cards Collection
02.2014 - 02.2020
Mainframe Developer
Citi cards Collection
04.2009 - 01.2014
Bachelor of Science (BSc) -
SASTRA University
MCA -
SASTRA University