Jiayao Yu

Managed engineering teams responsible for media pipeline encompassing video transcoding (client and server-side), video playback (our client side component powers all content consumption experience: Snaps, Stories, Spotlight and Ads), and media delivery stack (upload, download, caching). Our transcoding fleet processes hundreds of millions of videos each day, using a diverse set of hardware (NVidia T4 and L4 for GPU encoding) and encoding technology (H264, HEVC, VP9. AV1), spanning both AWS and Google Cloud.

Led significant improvements in media quality and compression efficiency, elevating Snapchat's video quality to match major competitors. Many of the quality improvements drove significant engagement win and increase in ads inventory.

Designed and implemented the Config Optimization Framework (COF), a system managing 4M queries per second and foundational to all AB testing and optimization across the company.

I have championed the adoption of AI tools. My team is one of the first in the company to try GitHub Copilot. I’ve also personally evaluated SourceGraph Cody. I have prototyped a Langchain based retrieval chatbots to improve knowledge discovery and sharing.

Managed mobile and video ads backend team for Google Ad Manager, focusing on ad targeting and ad format features in the extremely high QPS ads serving fleet.
Instrumental in establishing mobile as a first-class citizen in DoubleClick for Publishers, contributing to several major components and features.

One of the key members of bluetooth team. Implemented the personal area network section of Bluetooh spec in the Symbian OS. Main liason with Nokia on Bluetooth related features and issues.