• Architected and developed Voice over LTE (VoLTE) in the product of mobile network traffic adviser, which successfully help the mobile station and core network manufactures and wireless service providers.• Architected (with C++, OOP, SIP, SDP, RTP, etc.) and developed an IP Multi-media Core Network Subsystem (IMS) client framework based on the 3GPP standards, that uses SIP as signaling protocol communication with IMS and uses the RTP for transmitting media data. This framework has successfully facilitated the VoLTE application and provided solid base for other applications (such as video over LTE, presence, instant messaging, etc.) with IMS services.• Architected and developed IMS VoLTE emergency calling feature in the Capacity Advisor • Architected and designed Video over LTE (ViLTE) for the Capacity Advisor• Performed analysis and architectural design for new features, such as IMS AKA with IPSec for IMS authentication and encryption; Early media traffic detection, etc.• Successfully supported the sales engineers in the product field trials and in winning the product market share. Support customers by analyzing issues in the fields and providing resolutions in time. Provided technical tutorials to internal and external engineers.• Provided technical leadership, helped to manage resources, provided project estimation, communicated with PLM and other teams, negotiated contract with third-party vendors and supported clients.

• Designed and implemented in C++ multi-threaded, multimedia applications such as VoIP, IVR, audio/video conferencing, and Voice XML on a Linux-based media server controlled through SIP, H.248, MGCP, H323, HTTP, CGI, and Java Servlet. • Developed a RTP traffic generator/terminator for streaming multimedia packets with codecs: pcmu, g722, g726, g729, H.263, H.264, AMR, RFC2833, MPEG4, 3GPP NbUP. It also supported DTMF detection, RTP redundancy, SRTP, and MIKEY. • Architected and developed a high-stability, scalable multi-threaded load tester to load test an application server using SIP, TCP/IP socket, ACE, SOAP, RESTful, XML, and CURL. • Enhanced the stability, scalability and reusability of call control and RTP traffic server applications using IPC, OOP/OOD, Design Patterns. • Architected and developed a SIP call generator and multimedia packet stream analyzer that have significantly reduced manual test works and promoted test automation.• Provided technical leadership, helped to manage resources, communicated with other teams, and supported clients.

• Developed the Advantex/R7 N-tier mobile workforce management system using C++, SQL, XML, Java, WebLogic/CORBA, and Oracle Database. • Designed and implemented the Enterprise Scheduling system using Rational Rose, C++/STL. • Developed a prototype N-tier distribution system for scalability and performance investigation using WebLogic/CORBA, TUXEDO.

Developed software (using C++, Java, ORBIX CORBA) for Service Director MainStreetXpress for ATM telecommunication networks.• Designed and built System High Availability with Legato Cluster, ODI ObjectStore database replication controller. • Developed Stats Collector for Service Subscriber Management Application• Developed Generic Process Control Platform with UNIX IPC• Developed PERL/CGI/HTML/Servlet application for SD system administration through Web

Developed software for Crystal Report for Business Intelligence• Developed DBCS code and resource DLLs for internationalization/localization. • Developed Database access DLLs with SQL, ODBC, native API• Developed Exporting DLLs for Lotus Notes, VIM• Developed multi-task, multi-threaded applications for Crystal Info System• Developed Desktop UI with MFC, SDK for Process Scheduling

Developed software for a 3D range scanner and rail profiling system (based on computer vision, image processing, pattern recognition and artificial intelligence) in a real-time, multi-task environment (UNIX, pSOS+ and VME bus)• Created algorithms that recognize and classify new patterns for identifying rail types. • Designed and implemented Dynamic Data Exchange (DDE) in Windows environment. • Designed database schema, built database-manipulation functions for the RAIMA relational database embedded in the Rangecam System, and optimized database query routings.