Mengfei Ren Email & Phone Number

United States

San Francisco, Ca, Us

We are the platform that connects Airbnb to the outside world of payment processors for the execution of any payment anywhere reliably, accurately, conveniently, and cost-effectively. We moves triple digits billion dollars on our platform on an annual basis across ~200 countries, 70 currencies, via 20+ payment providers and ~400 merchent accounts.- Manage a Processing team with 14 members in US, India and Poland.- Manage a Guest SCA team with 7 members in US and India.- Built 2 India teams from 0 to 1.- Onboarded a payments Ops team with 5 contractors to handle 3rd party related operational issues.Own 4 critical domains:- Gateway Platform The unified gateway handling both payin and payout payment processing flows. Integrated with ~20 PSPs, ~70 currencies across ~200 countries.- Routing Engine The configurable service with smart failover function. that is responsible for ~400 Airbnb merchant accounts- Offline File Processing Offline ETL service to handle bank settlement files, chargeback files, BIN files, etc.- Guest Strong Customer Authentication A vertical domain that applies additional authentication on payments, to comply regulations in Europe.

San Francisco, Ca, Us

Payments Processing TeamTech lead for Payouts SOA migration.

San Francisco, Ca, Us

Payments Processing Team- Built Redundant Gateway and failover logic for Airbnb payin credit card flow, which took 70% of Airbnb payin volume.- Integrated Western Union as a payout processor- Designed, built and migrated Stored Value 2.0, a service and architecture to support Airbnb credits(Gift Card, Referral Credit, Employee Travel Credit)

Sunnyvale, Ca, Us

Yahoo Gemini (Search & Native Ads) Team- Backend engineer for Yahoo Mobile Ads Serving team.- Extracted ads from HBase, processed data using PIG scripts, and feed data using Protocol Buffer.- Designed and built the E2E integration infrastructure in order to test the new features with quality. - Built an internal debugging tooling which helped team to debug why the ad is not serving. Reduced 60% of debugging time and the tool got used across teams. - Built a revenue monitoring system which fetches budget data in real time, alerts on anomalies based on MoM and YoY data.Experience: Java, PIG, UDF, Hadoop, HBase, Oozie, Google Protobuf

Sunnyvale, Ca, Us

Yahoo Search team- Backend engineer for Yahoo Shopping offers feed process system.- Tech-lead to crawl shopping data as categorization training data.- Developed the online/offline classification component. - Built an internal editorial tool (UI, API) to feed crawled data, let editors review and revise data, report classification accuracy daily changes, and run classification demo.Experience: Java, PIG, UDF, Hadoop, HBase, PHP, Javascript, Bootstrap, Selenium, maven, jetty

Raleigh, Nc, Us

Global Support Services (GSS) Subscriber Platform Engineering Group, Diagnostic Analysis team.- Responsible for improving the customer cases classification accuracy.- Aimed to automatically identify and route customer problems to different Red Hat specialty departments.- Used Mahout and conducted Naive Bayes and Logistic Regression (SGD) classifiers. Modified and integrated self-developed analyzer to Mahout. Integrated code and test cases in the Maven project.- Built cascading classifiers and fixed the class imbalance problem by resampling. Improved the classification accuracy from 69% to over 80%.- Built an initial language classifier to separate Japanese from English cases. Applied different analyzers to different language cases.- Used LDA algorithm in mallet to build topic models.

Redmond, Washington, Us

Developed the campus blog service using the Microsoft Solution Framework.

Ms, Computer Science

Bachelor Of Engineering, Computer Software Engineering