Gomadheeswari Mani
Aubrey,Texas
Summary
Experienced Mainframe developer with 7+ years of COBOL, JCL, and DB2 experience in banking and Finance domain. Skilled in designing, coding, and optimizing core banking batch and online transaction processes. Strong in production support, performance tuning, and troubleshooting high‑volume jobs under tight SLAs and regulatory constraints. Recently gained Azure data engineering experience (ADF, data lake, SQL) to integrate mainframe data with modern analytics solutions
Overview
14
14
years of professional experience
Work History
Big Data Engineer
BinTech Group Inc
06.2024 - 05.2025
- Developed data pipelines leveraging Azure Data Factory to conduct ETL from various sources into Azure Data Lake and Azure SQL databases.
- skilled in transferring data from on-prem Oracle server to cloud storage via Azure Data Factory ensuring precise handling of financial and payment data.
- Designed scalable ETL solutions in Azure Databricks by integrating data into three distinct layers—bronze, silver, and gold—using PySpark and SQL, enhancing visibility into payment flows and employee data.
- Developed Databricks notebooks to extract data from Azure Data Lake, executing various transformation, join, aggregation, filtering, and data cleansing processes using PySpark and SQL for insightful business analysis.
- Implemented Delta Lake features such as time travel, schema enforcement, and merge/upsert operations to manage incremental data loads and ensure data consistency.
- Built an efficient Azure Data Factory pipeline to load incremental data from sharepoint , on-prem systems and REST APIs.
- Used parameterization and input globalization in pipelines to ensure standardization and reusability.
- Created and maintained Azure SQL database objects like tables, views, and procedures to support ETL workflows.
- Implemented CI/CD pipelines using Azure DevOps to automate deployment and streamline updates.
Mainframe Developer
Wipro Technologies
02.2016 - 10.2018
- Executed SQL statements for data validation to check data integrity, error handling, data redundancy, and data consistency.
- Identified and documented additional data cleansing needs and consistent error patterns.
- Written SQL Queries to define, Identify and validate the code written for the data movement into the database tables.
- Tested mapping for extracting, cleaning, transforming, integrating and loading data into the target system.
- Performing QA Smoke, Acceptance, Regression, Function, UI, Usability and Compatibility Testing.
- Developed detailed test plans,test cases, and test data for both source and target systems.
- Wrote and optimized SQL queries to validate large volumes of data across Relational DB/Oracle/SQL server databases.
- Created and maintained defect logs in HP ALM , tracked defects through resolution and performed regression testing.
- Documented and Maintained test metrics,progress reports and risk management to QA leads and project managers.
Mainframe Developer
Wipro Technologies
07.2011 - 01.2016
- Deployed new requirements and preserved changes in mainframe applications through COBOL, JCL, CICS, and PL/I programming languages.
- Designed, developed, and modified JCL for batch processing, scheduling, and dataset management across multiple environments (DEV, QA, PROD)
- Investigated business logic and rectified performance challenges in critical mainframe applications.
- Logged, tracked, and resolved incidents through ITSM tools (ServiceNow/Remedy), ensuring timely closure and compliance.
- Developed standard operating procedure (SOP) addressing recurring production issues and ensured ongoing updates for future reference.
- Generated and showcased weekly and monthly status reports for management review.
- Performed in-depth root cause analysis for abends and implemented resolutions in system testing phase. Providingviding remedies for production errors or defects.
- Provided on-call production support, troubleshooting CICS region failures, DB2 issues, file handling errors, and job scheduling conflicts
- Developed unit test plan and executed unit testing and integration testing while supporting testing team in deploying changes to production.
- Coordinated and supported onshore and offshore to track and monitor failures of production issues.
- Monitored and supported critical batch jobs in production, ensuring SLA adherence and system availability.
- Analyze abends to uncover root causes, implement fixes, and coordinate with necessary teams until issues are resolved.
- Provided 24/7 production support and participated in on-call rotations for mission-critical systems.
Education
Bachelor of Science -
Sri Krishna College of Engineering And Technology
Coimbatore,India06-2011
Skills
- COBOL
- CICS
- JCL
- VSAM
- PLI
- Azure Data Factory
- Azure Databricks
- Azure SQL Databse
- Azure DataLake Storage
- Pyspark
- SQL
Timeline
Big Data Engineer
BinTech Group Inc
06.2024 - 05.2025
Mainframe Developer
Wipro Technologies
02.2016 - 10.2018
Mainframe Developer
Wipro Technologies
07.2011 - 01.2016
Bachelor of Science -
Sri Krishna College of Engineering And Technology