Zhejian Peng

About

Seeking frontier intelligence and application.

Anime portrait of Zhejian Peng

I'm Zhejian Peng. At xAI I work on the Phoenix ranking model and Grok Coding RL — training Grok to write and reason about real code.

The through-line is the same: take a messy real-world decision — what to stock, what to show, what to train — and make the model useful at scale.

Email: zpeng@x.ai

Career

  1. SpaceXAI / xAI Member of Technical Staff

    Phoenix ranking model. Grok Coding RL — training Grok to write, debug, and reason about real software.

  2. Snap Tech lead · product ads ranking

    LLMs and multimodal models for product ads: content understanding, delayed conversion, in-context ads. Invited speaker at Ai4 and Seoul.

  3. Stanford AI Graduate Certificate

    Graduate certificate in Artificial Intelligence — the same graduate-level AI coursework as on-campus Stanford students.

  4. TikTok Video recommendation

    Led a team of 6 on personalized comment ranking. Interactive rec with LLMs. Invited to speak on personalized ranking.

  5. Walmart Data Scientist → Senior DS

    Patented probabilistic forecasting for fresh in-store production. Company hackathon, first place. Analyst to Senior in a year and a half.

  6. School

    UIUC Physics & Economics, then MS in Operations Research. Georgia Tech MS in Computer Science.

  • US patent · fresh inventory
  • Ai4 speaker · 2022 & 2024
  • Reviewer · NeurIPS, ICML
Jazzik