Weijun Li Email and Phone Number

Leading the startup team to build a hybrid engineering team which consists of engineers in both Boston and China, to design, develop and operate a reliable web service for marketing, recruitment, management and dispatching of ESL teachers.Technology Stack:#Backend - Java, Spring, Dropwizard, Mybatis, MongoDB, Memcache, Solr/Lucene search. Quartz , Crawler4J, JSoup#Frontend - Backbone.js, React#Project & Ops – Jira/Bitbucket, AWS EC2/RDS

Dreamed and built a data-oriented campus recruitment service (www.jiuyetu.com and WeChat Offocial Account), by providing handy career & job-fair management SAAS to the Career Development Center of each university. Within two years jiuyetu.com successfully became the most popular campus recruitment service in northeast China.Technology stack: #Backend - Java, Spring, Hadoop, HBase, Memcache, Restful API, Solr search, Tomcat#Frongend - knockout.js, declare.js, bootstrap, qunit#Project & Ops - Remine/SVN, Ali Cloud

Game cloud engineering, server utilization and performance tuning, to design and provide customized optimizaiton solution for games with huge traffic and large amount of user and activity data.

* Analyze, design and implement core server features.* Performance tuning for system with super large traffic.* Cassandra, Thrift customization, optimization and integration, to handle billions of hits across data centers* Predicting and visualizing of data pixel consumption rate for each data campaign

Responsibilities: * AdServer design & development, infrastructure optimization, performance tuning (cache, CDN etc) and capacity planning* Logging data aggregation and analysis. Cross DataCenter data synchronization.* Data modeling framework to improve revenue performance. Boosted banner ads conversion rate by 10%* Production issue analysis and tracking* Server farm monitoring

1. Participated in early stage of engineering team building, training and daily management.2. Initiated design and coding of high performance AdServer and media front end tools: publisher/advertiser registration, Ad campaign management, CPD/CPH, CPM, CPC and CPA media buy, reporting and tracking.3. Managed the followings: front end product development (CSS, JavaScript, AJAX, Flash/Flex/ActionScript), build and source control management (CruiseControl+Tortoise/SubVersion), reporting batch, application server & Oracle 10g operation (FreeBSD load balancing, capacity/availability, monitoring, changes, archiving, backup, rollout etc), IT service (Microsoft Windows Server 2003, Domain Controller, Active Directory, Exchange server etc).4. Conducted research to apply data mining algorithms in AdServer: webpage crawling and indexing by using Apache Lucene and Nutch. ETL, SSIS, SSAS, OLAP, association, clustering, \text classification, SVM, logistic regression, scoring card etc.

1. Designed and implemented anti-phishing and site protection infrastructure and projects.2. Collected and analyzed technical requirements for building the new Help Center based on third party knowledge base product. Led evaluations of different knowledge base vendors3. Led the integration of a WebLogic J2EE KBase product into PayPal’s C++ environment (embedded JSP via application server).

Project "eBay Accounting Assistant" (http://pages.ebay.com/accountingassistant/)1. Worked with PM to prototype the product based on direct customer requirements. 2. Architected and implemented version 1.0 release to public.3. Coordinated with PM, UI, QA and doc team to deliver the high quality application to eBay power sellers.Project "eBay SDK for Windows" and "eBay SDK for Java" 1. Designed SDK infrastructure based on Web Service Extension (for .NET) and Apache Axis 1.1/SOAP (Java) with database support (SQL Server + MySQL through ADO.NET/OLEDB & JDBC for Java)2. Implemented the SDK core in Microsoft .NET 2.0 and JDK 1.4 with examples in C++, Java, Perl and PHP3. Developed eBay ISAPI server in C++.4. Coordinated with DTS team to provide professional support for eBay 3rd party developers.Project "eBay API Control Panel" - A Windows desktop tool that execute/analyze XML/SOAP API test scripts in multi-thread mode with search capability built upon Lucene engine.

1. Invented and patented the technology to protect Win32 PE executables. Implemented the advanced protection and obfuscation engine to boost the security of PE protection.2. Led the design and implementations of the cross-platform product in C/C++/MFC/ATL: Vbox DRM SDK, security client, VboxBuilder/TrialBuilder.3. Led the project to port Privilege 4.7 Windows (previously VboxBuilder) to Macintosh 9.x and OS X (BSD 4.4).4. Principal developer for backbone projects: Privilege SDK, Unix security daemon, file system operation and hardware detection.5. Communicated with customers like Adobe and Macromedia for requirement collection and problem tracking.

-Architect and primary developer of VboxBuilder: a eCommerce product that protect win32 based software (PE format executables) for safe trial or purchase via InternetPatents:1. "Merging of separate executable computer programs to form a single executable computer program". U.S Patent 6,334,213. Dec/25/2001.2. “System for obfuscating computer code upon disassembly”. U.S Patent 7065652

-Development of DOS based Chinese Operating System in x86 assembly language.-Mainly responsible for development of publishing and printing subsystems.