# Wenfei Liang

> Senior Software Engineer at Worldline

Location: Greater Boston, United States
Profile: https://flows.cv/wenfei

## Work Experience
### Senior Software Engineer @ Shift4
Jan 2014 – Present | Greater Boston
• 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.

### Data Analyst Intern @ BitSight Technologies
Jan 2013 – Jan 2013 | Cambridge, MA
•	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.

### Data Analytics Lead Developer Co-op @ Alcatel-Lucent
Jan 2012 – Jan 2012 | Westford, MA
• 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.


## Education
### Master's degree in Computer Science
Northeastern University
Jan 2011 – Jan 2013

### Master's degree in Computer Software and Theory
Beijing Jiaotong University
Jan 2004 – Jan 2007


## Contact & Social
- LinkedIn: https://linkedin.com/in/wenfeiliang

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Source: https://flows.cv/wenfei
JSON Resume: https://flows.cv/wenfei/resume.json
Last updated: 2026-03-22