About

Vijaynarayanan Panneerselvam is a Senior Consultant at Visa with over 15 years of experience in architecting, designing, developing, and administering databases, data warehouses, and data analytics based on SQL Server and Oracle technologies. He has immense knowledge in the payments domain and data platform stack, which has enabled him to plan and execute tech integration of new acquisitions. Vijaynarayanan has been a major contributor towards the VLDB migration of Oracle to SQL Server and was the lead inventor 2018 at Visa Inc. BLR for filing the highest number of trade secrets in the payments domain. Currently, Vijaynarayanan works as a Senior Consultant - Software Engineer at Visa's Cybersource and Verifi platform, where he manages the technical deliverables of the product team with a pool of six engineers. He is responsible for developing RDBMS, DWH (ETL pipelines), and reporting-based solutions for business use cases. Vijaynarayanan evaluates complex business features, designs, allocates resources, delivers the code in a timely fashion using agile methodology, and tracks it via Rally. He has also architected and designed highly scalable and available data models for very large on-premise SQL Server database systems with active-active configuration. His application TPS requirement is 5500, and availability is 99.999. Vijaynarayanan has also driven the migration initiative of 1 Peta byte DB Oracle 12c to SQL Server 2017 and built a machine learning-based framework for improved business monitoring and decisions using R and SQL Server. Before joining Visa, Vijaynarayanan worked as a Staff Software Engineer at Visa and as a Technology SME for SQL Server at IBM. At IBM, he managed multiple accounts, provided support for critical SQL Server issues, and improved overall customer satisfaction. He conducted account-level analysis for proactive defect prevention and handled only escalated L4 issues. Vijaynarayanan holds a Bachelor of Technology (B.Tech.) degree in Information Technology from Anna University. He also completed his high school education from NSVV Boys Higher Secondary School and NSVV Matric Higher Secondary School, where he studied Bio-Maths and Biology-Maths, respectively. Vijaynarayanan's technical skill set includes SQL, Software Engineering, Data Warehouse, ML, ETL, Integration, Search, and Azure. He has 17.45 years of relevant experience in the industry.