# Guangyu Sun

> Principal Video Software Engineer at Roblox

Location: Redwood City, California, United States
Profile: https://flows.cv/guangyu

Skills/Interests: Multimedia, Virtual Reality, Linux, Android, Computer Graphics, Computer Vision
Open Source Experience: FFmpeg, OpenCV, Linux Kernel, Android, ExoPlayer

## Work Experience
### Principal Video Software Engineer @ Roblox
Jan 2022 – Present | San Mateo, California, United States

### Senior Video Software Engineer @ Roblox
Jan 2021 – Jan 2022 | San Mateo, California, United States

### Principal Software Engineer @ Visbit Inc.
Jan 2015 – Jan 2020 | Sunnyvale, CA
- Visbit Pro/Lite 8K VR Player: Developed the core technology that enables 8K 60FPS video and Ambisonics audio playback for mobile headsets such as GearVR, Oculus Go/Quest, Vive Focus, and Pico, while most other solutions only have a hard limit of 4K video playback. Optimized the pipeline from network and codec to multimedia rendering.

- Visbit Pro/Lite Cloud Transcoder: Built a scalable cloud infrastructure with docker on AWS and AliCoud, for pre-processing and hosting VR content. Used FFmpeg intensively to generate multiple content formats for different devices and network conditions.

- 8K Live Solution: Optimized the video processing 20 times faster with GPU to achieve real-time. Took charge and supported multiple 8K VR live stream events and tests for 5G for big partners, such as AMD, Verizon, Tata, Infosys, KDDI, and China Telecom all over the world, including the US, UK, Australia, Japan, and China.

- PixBrite: Designed and implemented the offline collage generation algorithm for the iOS app PixBrite. The app may cluster photos and pick the representative ones to create collages automatically.

- Participated in a lot of other computer vision projects in stealth mode with Agile methodology. Optimized the video and computer vision pipelines for offline systems.

### Linux Kernel Developer @ Oracle
Jan 2012 – Jan 2015 | Redwood Shores, CA
- Maintained the git repository of Oracle Linux Unbreakable Enterprise Kernel.
- Debugged and Fixed a variety of Linux kernel modules.
- Contributed back to the mainline open source community.

### Intern @ The Blindsight Corporation
Jan 2011 – Jan 2011 | Berkeley, CA
- Designed and programmed a system for visual based paper currency recognition on Android smart phone. The currency reader can recognize US currency and speaks the denomination in real-time, enabling people with visual impairments or blindness to quickly and easily identify and count bills.

### Research Assistant @ Columbia University
Jan 2011 – Jan 2011 | New York, New York
- Worked on the “Leafsnap” project, a free mobile application uses visual recognition software to help identify tree species from photographs of their leaves. Tasks including investigating new leaf identification algorithms and current algorithm optimization. Advised by Prof. Peter Belhumeur.

### Research Assistant @ Shanghai Jiao Tong University
Jan 2009 – Jan 2010 | Shanghai, China
- Researched on objects detection and segmentation in a video under partial motion by combining motion cues with color and locality cues.


## Education
### MS in Computer Science
Columbia Engineering

### BS in Electrical Engineering
Shanghai Jiao Tong University


## Contact & Social
- LinkedIn: https://linkedin.com/in/guangyu-sun-04957b2b

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Source: https://flows.cv/guangyu
JSON Resume: https://flows.cv/guangyu/resume.json
Last updated: 2026-04-12