# Liangjun Feng

> AI/ML@Roblox | ex-Meta

Location: San Francisco Bay Area, United States
Profile: https://flows.cv/liangjun

## Work Experience
### Principal Software Engineer @ Roblox
Jan 2021 – Present
- Build infrastructure and platform to support large scale distributed training for 3D foundation models, recommendation models, etc
- Build inference engine and backend to optimize Recsys inference at Roblox

### Software Engineer @ Facebook
Jan 2015 – Jan 2021 | San Francisco Bay Area
1. Works at Messenger, Search and Facebook Watch.
2. Built a cross-platform(iOS & Andriod) mobile framework for efficient and realtime data syncing
3. Worked on first version of Messenger Lite
4. Worked on various products related to search on Facebook and Workplace
5. Worked on various products to personalize video feed through understanding user's interests

### Software Development Engineer Intern @ Amazon
Jan 2014 – Jan 2014
1. Responsible for search ranking optimization on Amazon Local Website by utilizing customer 
behavior.
2. Designed and implemented a new service to compute and index deal's performance scores 
through processing data obtained from data warehouse.
3. Created a new ranking function to incorporate deal's performance scores.
4. Launched the project. Preliminary result of A/B test showed new ranking strategy converted more clicks into purchases and created more revenue.


## Education
### Master of Science (MS) in Computer Science
University of California, Irvine

### Bachelor of Engineering (BEng) in Electrical and Electronics Engineering
Shanghai Jiao Tong University


## Contact & Social
- LinkedIn: https://linkedin.com/in/liangjuf

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