Since 2024: upgrading Search Discovery ranking recommendations using real-time deep learning, query & content classifications, fast data pipelines & distributed systems.2019 - 2023: Re-Thinking & Upgrading Privacy & Security for the planet-scale Search Technical Stack for All Search Needs (for Web, Play Apps, YouTube, Photo, Cloud, etc). The index data account for a huge portion of user data in Google and hence requires highly reliable security & privacy.2015 - 2019: Led a team of 11 software engineers across very large (50+ people involved) cross-org effort (across Search Ads, YouTube Ads, GMail Ads, and Display Ads) on Machine Learning Infrastructure to classify Ads targeting, policy violations, privacy, security, GDPR compliance etc.2013 - 2015: Led a crucial infrastructure in Google's high-volume and highly reliable software-based load balancing infrastructure.2008 - 2013: Led the world's largest DNS resolver, Google Public DNS, with high reliability & availability, using complex distributed system architecture.Worked in NYC office from Sep 2008 - Apr 2013 and am now in the headquarter in Mountain View, CA. Have been a Tech Lead since Aug 2011. Began serving as a manager in Nov 2016.

Design and implement prototypes of LTE-Direct wireless systems

Using site-specific knowledge and mobile positioning to optimize the handoff, power control, and throughput of wireless networks.

Implemented antenna models, enhanced measurement tools, and customized the internationalization settings of SitePlanner and LANPlanner software, which are world-standard prediction software for various cellular and WLAN signal coverage predictions

Analyze the privacy model of public databases for the Department of Health of Taiwan, Republic of China. Design and program a Chinese-input method called Chewing on the operating system Linux

Wrote C programs to handle instant messages on the Internet (similar to MSN)