Data qa

Gajendran Thangeswaran

Data qa

Available to hire

Data qa

Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate

Language

English
Advanced

Work Experience

Senior Test Specialist at iLink Multitech Solutions Pvt Ltd
December 1, 2023 - Present
Performs end-to-end ETL testing of large-scale data pipelines, validating data quality, integrity, and transformation logic across staging, EDW, and reporting layers. Wrote and executed complex SQL queries to validate source-to-target mappings and business logic across relational and big data systems. Used Azure Databricks with SparkSQL and PySpark for data validation in distributed environments. Collaborated with data engineers and analysts to design test cases, identify data anomalies, and ensure adherence to data governance and quality standards. Conducted detailed root cause analysis (RCA) of defects and data issues, documenting findings and driving permanent fixes with development teams. Led a QA team, managed task allocation, peer reviews, and Agile/Scrum progress tracking. Documented test plans, test cases, and defect reports in Azure DevOps.
Test Lead at Ernst & Young
July 1, 2021 - December 1, 2023
Strategic and technical QA lead on Strategy Edge project, delivering real-time collaborative platform and predictive analytics. Proficient in ETL/data warehouse concepts and SQL for complex query writing. Created automation test suites for regression, executed test cases, triaged defects, and guided the team in approaching new requirements. Conducted QA walkthroughs with business users and tracked defects using Azure DevOps/JIRA. Led the team through Agile ceremonies and contributed to test strategy and planning.
Associate Consultant at Capgemini Technology
October 1, 2019 - July 1, 2021
Migration-related ETL testing for LCR reports, ensuring data completeness and mapping integrity. Interacted extensively with Business Analysts and Developers to design SQL scripts and test cases; performed BI testing on both UI and DB layers. Participated in defect triage, logging in JIRA, and guiding fixes. Recognized with GE M Award for timely completion and leadership in handling multiple data sources with no defect leakage in SIT.
Test Engineer at Infosys Limited
May 1, 2016 - October 1, 2019
Validated enterprise data in Master Data Management project to ensure data quality and standardization. Prepared test scenarios and scripts, developed Oracle/Aqua Data Studio queries, tested data through staging areas, performed defect logging and daily status reporting in an Agile/Scrum environment.

Education

Bachelor of Engineering at Sathyabama University, Chennai, Tamilnadu
January 1, 2012 - January 1, 2016
Higher Secondary Education at Bishop Heber School, Teppakulam, Trichy, TamilNadu
January 1, 2011 - January 1, 2012
High School Education at Bishop Heber School, Teppakulam, Trichy, TamilNadu
January 1, 2009 - January 1, 2010

Qualifications

Microsoft Azure Fundamentals
January 11, 2030 - May 3, 2026
Microsoft Fabric Analytics Engineer Associate
January 11, 2030 - May 3, 2026
Microsoft Azure Data Fundamentals
January 11, 2030 - May 3, 2026

Industry Experience

Financial Services, Professional Services, Software & Internet

Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate

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