* Dual instance application design and developmentLeaded for application framework design and dual instance engine development. Made it possible to run dual instance of WeChat, QQ etc simultaneously based on plugin mechanism and API hooking. Debugged and solved the compatibility issues of top ranked applications in various Android platforms. * Commercialization of Clean MasterThe total users of Clean Master are more than 1 billion and the daily active users are more than 100 million. Integrated various Advertisement SDK and optimized the fetching and caching strategy to improve the advertisement fill rate and conversion rate.

* Yiqianbao Android development and optimizationInvolved in the formation of Android team in the early phrase. Constructed the technical framework and designed core module such as network, database and memory cache. Tracked down complex bugs encountered in development, usually related with concurrency and memory issues.  Optimized UI layout, code efficiency, memory consumption and network traffic.* Android tool development and new technology researchDeveloped a memory leak analysis tool, which could batch export Bitmap in dump file to image file. Developed a network tool to control the network interface data rate, which could simulate the low date rate GPRS network environment in Wifi or 3G/4G network. Investigated the WebView performance and feature in all Android version and designed a dynamic load solution to replace the Android native webkit with chromium core, improved the JavaScript performance by 20-70% and enhanced the HTML5 feature support rate by 40-130%.

* Android network system development and integrationIntegrated Wifi, tethering and VPN modules of multiple Android versions on Marvell SoC platform. According to China Mobile’s customized requirement, designed and implemented the solution of Wifi/Mobile network coexistence and network priority adjustment. Enhanced the parallelism of Wifi driver and improved the throughput by 20%, based on the bottleneck analysis by Systrace tool.* Android security and upgrade system development and integrationCustomized the Android build system according to Marvell Android integration solution, implemented the factory reset and OTA upgrade feature. Participated the design of trust boot solution and enhanced the Android system security by the mechanism of hierarchical signature verification and uboot/kernel backup.

* Managed Industrial Ethernet SwitchDeveloped software of Ethernet switch which support IEEE802.1Q VLAN, implemented HTTP server and Web Client to configure VLAN settings. Designed and implemented redundant protocol for Ethernet with ring topology and the recovery time met the real-time requirement. Developed SPI driver so that ARM chip could configure switch chip registers through SPI interface. The new product passed the tests of standard organization and its profit increased by 50%. Applied an invention patent.* Controller of Distributed Control SystemDeveloped software and communication modules of controller based on ADS platform and JTAG simulator. Developed CPU boot code and network card driver based on C and ARM assembly language. Ported TCP/IP stack and UCOSII kernel to ARM chip. Designed and implemented application protocol for controller communication based on TCP and UDP.