# Xianfeng Rui

> Staff Software Engineer, Meta Superintelligence Labs

Location: Sunnyvale, California, United States
Profile: https://flows.cv/xianfeng

## Work Experience
### Staff Software Engineer @ Meta
Jan 2019 – Present | Menlo Park, California, United States
- Tech leader for Llama4 speech model evaluation, including infra, benchmarks, metrics to assess the model performance from various aspects including understanding, generation and conversational dynamics  for both pre-training, post-training and RL
- Led and executed evaluation pipelines for speech tokenizers and audio encoders, measuring both semantic accuracy and paralinguistic representation.
- Tech leader for pronunciation modeling, pronunciation learning, personalization and contextual biasing of ASR models, shipped to various interfaces including Ray-Ban Meta glasses and voice-in-feed

### Senior Software Engineer @ PingAn Technology, US Research Lab
Jan 2018 – Jan 2019 | Palo Alto, California, United States
- Delivered the system of real-time ASR decoding based on Kaldi
- Built deep learning models to detect stress and evaluate vowel and consonant quality
- Led the group for automatic pronunciation assessment including stress, vowel and
consonant for L2 English speech

### Senior Staff Engineer in SOC and FW @ SK hynix memory solutions America Inc.
Jan 2013 – Jan 2018
-Architected and designed new generation DMA, NAND controller and NAND PHY
-Developed Firmware for command fetch of Host for NVMe PCIE3
-Responsible for Firmware development of NAND controller, working closely with
NAND engineer and achieving the required performance for mass production

### Staff ASIC Design and Verification Engineer @ Link_A_Media Devices Corporation
Jan 2007 – Jan 2013
-Built the first generation NAND model of our company using C++ from scratch
-Brought up the first generation verification environment of NAND controller using C++
-Designed and architected the main modules of data path including SOVA controller, scrambler, RLL and LDPC encoder


## Education
### Master of Science - MS (Ph.D. Candidate) in Condensed Matter Physics
University of Illinois Urbana-Champaign

### Master's degree in Condensed Matter Physics
Peking University

### Bachelor of Science - BS in Applied Physics
Southeast University

### Artificial Intelligence Graduate Certificate in Computer Science
Stanford University


## Contact & Social
- LinkedIn: https://linkedin.com/in/xianfeng-rui-46a72037

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