Customer Service Engineer

Wenxian Cai

**** ******** ***, *** ****, CA ***** 669-***-**** *******.***@*****.***

www.linkedin.com/in/wenxian-jackcai

Professional Summary

Have strong knowledge of Object Oriented Programming and experience in Java Core and Java Web of Enterprise Development

Have experience on J2EE framework Struts, Spring, Hibernate, MyBatis, JSF, JDBC, Servlets, REST, Java Mail, I/O components and big data framework Hadoop, Hive

Familiar with the web application front-end technology JSP, HTML, JavaScript, JQuery, Velocity, AJAX, CSS, Easy-UI, and AngularJS

Experience in SQL, relational databases Oracle, DB2, SQL Server, MySQL and non-relational databases HDFS, MongoDB and AWS products

Professional Experience

Toolots Inc. Los Angeles, California, U.S.

Software Development Engineer Internship May 2017 - Jul 2017

Fetched orders and products data from REST APIs and developed modules for Toolots Android APP

Analyze the distribution and changing tendency of customers by Hadoop MapReduce from 50 states

Crawled products' information and compared from ten e-Commerce websites by Python

California Lutheran University Thousand Oaks, California, U.S.

Graduate Research Assistant May 2016 - Aug 2017

Developed a project of Content Review Analysis for Amazon Comments

Collected, cleaned, and filtered the data of Amazon Comments from 1994 to 2014 year

Preprocessed JSON data and stored 9 GB text files in the Hadoop Distributed File System, which deployed on 16 machines

Utilized MapReduce and Distributed Cache patterns to extract the content of text and predict the positive or negative sentiment tendency of reviewers by thousands of emotional keywords

Visualized the distribution of average ratings for Amazon customers’ satisfaction, top 10 products/ users by reviews and offered suggestions of improving customers’ experience

Infosys Technologies Co., Ltd Shanghai, China

Technical Leader Apr 2015 - Sep 2015

Developed a financial transactions platform including equities, fixed income, bonds and derivatives

Developed a bond trade system for the Oriental Securities Co, Ltd and received customer satisfaction

Designed and developed Java APIs for front-end of trade system which used .Net framework

Implemented the logic process of bond type, bond name, unit price, quantity, total amount and date

Used Junit framework for unit testing and Log4j to capture the log that includes runtime exceptions

Bleum Software Development Co., Ltd. Shanghai, China

Java Development Engineer III Dec 2013 - Apr 2015

Designed and developed Avocado system for Walmart customer service by using Struts, Hibernate

Developed a new replacement flow, shipping flow and created a limitation of customers' replacement, which save close to $1.5 Billions

Investigated problems from logs and solved critical production issues by troubleshooting skills

Extended and enhanced Walmart ecommerce platform, which adopted JIRA and Scrum in the Agile projects to improve 20% efficiency of development

Provided technical support of production and training regarding our systems

Used Memcached to cache results of massive of searching

Cognizant Technology Solutions Co., Ltd Shanghai, China

Java Development Developer Apr 2011 - Jul 2013

Designed and developed a sales management system by using Java, Struts, Spring and Hibernate

Developed a new budget plan application and analyzed statistical data from Oracle

Implemented an automatic email platform, which can run scheduled tasks to support 5,000 users

Developed an insurance purchasing platform, which save customers 30% time, by using IBM Message Queue

Developed a flight ticket mobile website for Singapore Airline by using Java, XStream and JQuery

Education

M.S. Information Technology. California Lutheran University, United States May 2016 - Aug 2017

B.S. Computer Science. Shanghai Second Polytechnic University, China Mar 2009 - Jul 2013

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