• Developed a JavaScript library for EMV 3DS enhancements in hosted checkout and RESTful API integrations, reducing the number of EMV 3DS challenge flows for customers.

• Designed, implemented and delivered production-ready Google Pay Gateway RESTful API using C# 10 and .NET 6 by collaborating with cross-functional engineering teams. Core features include Google Pay Decryption, Signature Verification, Key Rotation Management.

• Developed and maintained unit tests for the Google Pay Project using C# (97% coverage), for the JavaScript library of EMV 3DS enhancements using Jest (100% coverage), and initiated unit tests for a legacy Java project with Junit and Jacoco (75% coverage).

• Developed administrative web portals ROAMsupport and ROAMmerchant(MCM6) using Angular, Typescript, Spring MVC. Took the lead for multiple projects and managed contract team for the implementation.

• Implemented critical RESTful API features (MCM6) including Core Transaction Report, Webhook, Billing Package Management, Reset Password, User Management, Configuration Management, Customer Boarding, etc. using C#, SQL Server.

• Monitored/optimized the performance of Core Transactions Report API using Jmeter.

• Developed administration web portals ROAMsupport and ROAMmerchant(MCM5) using Spring MVC, jQuery.

• Processed data using Hadoop, Hive, HBase, BigQuery on EC2/google cloud platform.

• Analyzed and visualized data using Pandas, Matplotlib, Numpy, Scikit-learn, NLTK, IPython with algorithms of Naïve Bayes, K-means, DBSCAN, Affinity Propagation.

• Scraped and stored data from website using Scrapy, PostgreSQL, SQLAlchemy.

• Created shell scripts and run multiple tasks with command line tools including s3cmd, bq, gsutil on Ubuntu.

• Implemented new features and fixed bugs of the Data Analysis web application using Ruby on Rails.

• Refactored code by removing 70% duplicate code.

• Improved performance by 90% on running analysis and reduced 90% of exporting zip/csv file download time.