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.

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.

Refactored code by removing 70% duplicate code.

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