Summary
Overview
Work History
Education
Skills
Certification
Timeline
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AYYAPPAN S

AYYAPPAN S

Big Data Tester | Technology Analyst
Bangalore

Summary

A results-driven Big Data Tester with over 4 years of expertise in data validation, ETL workflows, and large-scale data management. Passionate about leveraging cutting-edge technologies like Hadoop, Hive, SQL, and Postman to ensure data integrity and optimize workflows. Adept in Python libraries (NumPy, Pandas, Matplotlib) for powerful data analysis and visualization. A collaborative team player who thrives in fast-paced environments, always looking for innovative ways to improve data solutions. My career is driven by the desire to solve complex data challenges and contribute to the seamless functioning of mission-critical systems in Big Data and financial technologies.

Overview

5
5
years of professional experience
3
3
Certifications

Work History

Big Data Tester

Visa Contractor
09.2024 - Current
  • Company Overview: Commercial and Money Movement Solutions (CMS), Wizards Sub-team
  • Performed end-to-end file testing for HSBC, verifying the accuracy of data loading and validation, ensuring integrity across all platforms
  • Processed HSBCF files (inbound processing), guaranteeing the accuracy and reliability of financial transaction data for seamless processing and compliance
  • Contributed to client migration activities, ensuring smooth historical data loads, reducing discrepancies, and enabling seamless transitions
  • Commercial and Money Movement Solutions (CMS), Wizards Sub-team

Big Data Tester

Visa Contractor
02.2024 - Current
  • Company Overview: Commercial and Money Movement Solutions (CMS), Data 2.0 Sub-team
  • Processed issuer files for Visa, ensuring accurate, timely data exchange, reducing operational delays and enhancing system efficiency
  • Tested VisaNet and B2VCF data flows, identifying and resolving discrepancies, leading to smoother and more reliable transaction processing
  • Developed and implemented VIDS templates, streamlining data validation, improving error detection, and reducing validation errors by 25%
  • Optimized data workflows by testing API scenarios with Postman, enhancing efficiency and reducing testing cycles by 15%
  • Analyzed and managed large datasets in Hadoop and Hive, proactively identifying and resolving data issues, resulting in improved data accuracy and reliability
  • Collaborated with cross-functional teams, resolving file issues and ensuring high service uptime, minimizing system downtime
  • Commercial and Money Movement Solutions (CMS), Data 2.0 Sub-team

Senior Systems Engineer

Infosys
01.2020 - 12.2023
  • Assisted in migrating large product datasets to HDFS and Hive, improving data accessibility and system performance by optimizing storage
  • Designed and optimized ETL workflows using SQL, Informatica, and SSIS, improving data consistency and reducing processing times by 30%
  • Led training sessions on Data Warehouse testing, Python, Informatica, and Big Data technologies, empowering 50+ team members to successfully execute complex testing scenarios
  • Delivered comprehensive test strategies for large-scale data validation, ensuring quality in high-stakes financial environments

Education

MBA - HR Management

Annamalai University

BE - Computer Science Engineering

Kumaraguru College of Technology

Skills

Hadoop

Certification

Microsoft Azure AZ-900

Timeline

Big Data Tester

Visa Contractor
09.2024 - Current

Big Data Tester

Visa Contractor
02.2024 - Current

Senior Systems Engineer

Infosys
01.2020 - 12.2023

MBA - HR Management

Annamalai University

BE - Computer Science Engineering

Kumaraguru College of Technology

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AYYAPPAN SBig Data Tester | Technology Analyst