- Provided technical leadership across projects and oversaw architecture, performance and technical aspects on highly available web services and applications- Led own development and QA team and coordinated with production support team and external teams in multiple geographic locations on various applications and projects. - Developed and managed highly scalable micro services, consolidated services and web applications from scratch that handle 300+ millions and growing transactions per day.- Built and maintained application that synchronizes transactional changes on over 5+ billions records between Oracle and Mongo through Kafka and Zookeeper, within milliseconds.- Identified, troubleshot and fixed performance issues which improve response time and throughput by 5 times.- Drove design and implementation on active / active production environment across data centers.

- Managed a team of 10+ engineers in 3-level hierarchical organization globally through multiple software releases.- Oversaw whole project release cycles from requirement gathering, design, development, QA to deployment of a team of development and QA engineers.- Had track records of rolling out new products from scratch in short cycles while maintaining production applications.- Competent interacting with multiple engineering, product management, support and professional service teams.- Hands-on throughout the whole release cycle, acted as developer, QA, support when needed.- Led design and architecture effort on projects, software applications and components, maintained good balance of technical and management work.- Continued to design, implement and maintain 24x7 N-tier web applications and REST and SOAP APIs with various technologies including Apache, Tomcat, Struts, Spring, Oracle, Jersey, AJAX and Axis.

- Created architecture design on software components and their interactions.- Designed and developed framework which allows team members to migrate static html components to AJAX components, accomplishing average 300% page load time improvement among all users.- Designed, implemented and maintained 24x7 N-tier web applications and web services API.- Investigated and fixed multi-threaded problems and memory leaks on various Java applications.- Identified production issues and provided fixes / workaround in timely fashion.- Written and maintained Perl cron scripts that publish metadata to large amount of servers in CDN networks.- Mentored junior or new team members on designs and projects.

- Managed project schedule of a team of five members.- Identified and resolved performance bottle neck on existing commerce product, which results in performance improvement by 25 times on page response time and 3 times on whole check-out page flow.- Architected and implemented a search-oriented and highly performed discussion forum application using struts, JBoss Tree Cache, Lucene and AJAX.- Designed, developed, tested and maintained JSR 168 Portlets and Web Services for Remote Portlets (WSRP) on J2EE based Portal Framework / Application.- Designed, developed, tested and maintained Java based data loader application, which parsed and loaded data in xml format to database tables.- Ported applications to various Application Servers, including WebLogic, WebSphere and JBoss.

- Designed, developed, tested and maintained server components of a wireless device application which allowed users to access the internal Web Application of companies using Java, SQL, HTTP, DHTML, JavaScript and XSLT.- Provided solutions and suggestions to technology problems encountered by professional service team or customers during product deployment.

- Designed, developed, tested and maintained components of J2EE Web Service Integration and management platform using SOAP, WSDL, XML, SAX, DOM and other Web Service technologies.- Designed, developed and maintained a Java and web service-based application, which deployed, tested and un-deployed J2EE applications in asynchronous manner on several different Application Servers in the network.- Ported the company product to various Application Servers, including WebLogic, WebSphere, Iplanet, Borland Enterprise Server and Tomcat / Apache.- Responsible for builds (twice daily) on multiple branches and multiple platforms.

- Analyzed, designed, developed and tested both front-end and back-end software components of a three-tier, J2EE based,personal network communication system.- Maintained and configured Application Servers (JBoss), Web Servers (Apache & Tomcat) and Database Servers (MySQL).