Sabari Girish B
Chennai
Summary
Results-driven Data Tester with 5 years of experience in ELT/ETL testing and Snowflake Data Warehouse. Specializes in building advanced SQL test cases to enhance data accuracy, security, and quality. Proficient in troubleshooting and debugging ETL pipelines, contributing to significant improvements in data warehouse efficiency and supporting business intelligence initiatives.
Overview
1
1
Certification
6
6
years of professional experience
Work History
ETL Tester
CGI , Scotia Bank
01.2026 - Current
- Developed test plans and scripts to validate ETL jobs.
- Created comprehensive test cases for ETL processes, enhancing data quality assurance.
- Worked closely with data engineers to pinpoint and rectify data discrepancies, improving data integrity.
- Conducted data validation using SQL queries with Mapping requirement.
- Detected and reported performance issues in current pipeline, leading to targeted optimizations.
- Managed and processed various file formats including Parquet, Avro, JSON, XML, and text.
- Participated in daily stand-up meetings to discuss project progress.
Data Quality Analyst
CGI , TD Bank
01.2025 - 01.2025
- Developed Test Cases /Execution for Various file formats like Json/Parquet/CSV/XML. Detected errors and mitigated existing issues in data and provided solutions prior to data processing. Used various types of transformations such as Expression, Joiner, Update Strategy, Lookup, filter for developing mappings.
- Designed complex SQL queries to validate the integrity of database objects such as tables, views and indexes.
- Performed root cause analysis on data quality issues, identified corrective actions and communicated results to stakeholders.
- Reviewed data sets for accuracy and completeness before analysis.
- Identified gaps in current Data Quality policies and processes and proposed solutions for improvement.
Data warehouse Tester
Accenture, Ally Bank
12.2022 - 12.2024
- Ensured data integrity and verified all data modifications and calculations during database migration using ETL tools.
- Developed test cases and plan for ETL data migration based on business requirements.
- Performed unit testing to identify and resolve defects in code, including regression and functional testing strategies.
- Tested data synchronization after full data refresh to ensure accuracy.
- Implemented performance tuning logic on targets, sources, mappings, sessions to provide maximum efficiency and performance.
- Used various types of transformations such as Expression, Joiner, Update Strategy, Lookup, filter for developing mappings. .
ETL Tester
Accenture, West Band
03.2021 - 12.2021
- Played a key role as a ETL Tester in migrating legacy systems to cloud-based Snowflake Data Warehouse, impacting over 15 Years of data.
- Conducted source-to-target data mapping and developed test cases to ensure data completeness and accuracy.
- Detected errors and mitigated existing issues in data and provided solutions prior to data processing.
- Used automation tools like Tosca and qtest to implement testing strategies, reducing manual effort by 20%.
- Documented ETL testing strategies and access steps to facilitate team knowledge sharing, cutting onboarding time by half.
- Used Zero copy Cloning feature to fasten the Testing Cycle before Deployment.
Education
BE - EEE
RMK Engineering College
10-2020
Skills
Azure Cloud
- Data bricks , Data factory , Azure Storage
Google Cloud
BigQuery , Apache Airflow (DAG) ,GCS
Database / Warehouse
- Snowflake
- Oracle
- SQL Server
Coding Language
- Complex SQL
- Python /Pyspark
Project Management Tools
- Jira
- Confluence
- Bitbucket /Github
Certification
- SnowPro Core , Azure 900, SAFE
Timeline
ETL Tester
CGI , Scotia Bank
01.2026 - Current
Data Quality Analyst
CGI , TD Bank
01.2025 - 01.2025
Data warehouse Tester
Accenture, Ally Bank
12.2022 - 12.2024
ETL Tester
Accenture, West Band
03.2021 - 12.2021
BE - EEE
RMK Engineering College