Moved to Ads team in 2019. Main contributions include1. Identified improvement opportunities in a couple of batch scoring pipelines supporting Mail Re-targeting and Purchase Receipt products. Pinpointed various performance bottlenecks, and redesigned/implemented the pipelines to reduce the SLA from more than 24 hours to less than 8 hours. At the same time, hardware consumption has been reduced by 60%+.2. As the POC of the targeting team for the Gemini serving system(native ads for O&O inventory), supports the integration of targeting products requested. It includes providing technical solutions / implementing features / supporting production issues. Some highlights include * Enabling 1st party powered segments for privacy and data usage policy mandated by iOS 14.5+; * Enabling 3rd party segments integration ;* Provided custom solution for Wayfair's DPA ads

Relocated to the U.S. and working on central tech team to help on multiple projects to build a reliable platform. Including:1. As the POC of Yahoo Push Notification System for GDPR compliance, designed and implemented the GDPR client with the entire OnePush team to support all GDPR requirements. 2. Continue supports Image processing/serving service. Implemented features like Smart Crop/Gamma Correction/Color Thief and so on to make sure it meets customers' requests on image processing part. 3. Designed and implemented YAMAS(Yahoo's monitoring system) v2 collector to replace v1 collector; After the v2 release, the collector as the most unstable component in v1 became super stable.4. Build and released Comet SDK for iOS to support YAK scenario. (YAK is to allow Yahoo users to sign-in with device push notifications instead of password).

As tech lead, led a team design and implemented the new version of Yahoo’s image online processing service and seamlessly migrated all existing customers to the new service. This image processing service is used in all Yahoo products: front page/news/mail/finance/sports...1. Improved average process latency from 100ms to 30ms;2. Protected itself from been flooded by traffic surge;3. reduced 60%+ of hardware needs for the same amount of request served;

Created a sub system for WebGW(Yahoo's mobile portal) to change its customer configurations online;

Worked on different projects:1. Game client: build a game client in windows 7 integrated with X-Box live;2. Windows Mobile 6: MAIL/SMS module;3. Windwos Phone 7: MMS module;4. Healthcare: Nurse board in HIS;