Hejun Huang

Engineer at Amazon Prime Video · Personalization & Discovery

Building large-scale distributed recommendation systems: offline and online ranking, serving, training and batch inference for production personalization.

Ranking & Re-ranking Online Model Serving Batch ML Inference
ML Infra (CDK / EMR / Bedrock / MLflow / Airflow / SGLang)
hi@huanghejun.com
CV LinkedIn GitHub
Hejun Huang

News

latest
Apr 2026 Paper Constrained Learning-to-Rank for Controlled Trade-offs in Multi-Objective Ranking Systems was published in arXiv.
Dec 2025 Paper CalibJudge: Calibrated LLM-as-a-Judge for Multilingual RAG with Uncertainty-Aware Scoring was published in ICAIC 2026.
Dec 2025 Activity Contributed as a consultant to the Chinese translation of Engineering Design Optimization by Prof. Joaquim R. R. A. Martins, submitted to Science Press for publication.
Sept 2025 Activity Built the Harmonia Optimizer and CrossRanker services to power large-scale recommendation and page composition experiences for over 300 million customers worldwide.
2025 Paper Kubrick: Multimodal Agent Collaborations for Synthetic Video Generation was accepted to the CVPR 2025 AI4CC Workshop.
2025 Paper Distributed Coordination for Multi-Vehicle Systems in the Presence of Misbehaving Vehicles was published in Advances in Transdisciplinary Engineering.
Dec 2024 Paper Our work Privacy-Aware Design and Analysis of Drone Remote Identification Systems was published in IEEE Transactions on Intelligent Transportation Systems.
Oct 2024 Activity Joined Amazon Prime Video Personalization and Discovery (PVPD), developing large-scale recommendation systems for global streaming platforms.
Mar 2024 Activity Contributed as a consultant to the Chinese translation of Engineering Design Optimization by Prof. Joaquim R. R. A. Martins.
Jan 2024 Activity Served as Research Engineer Intern at Baidu USA in Sunnyvale, California.
Dec 2023 Activity Graduated from the University of Michigan, Ann Arbor.
Oct 2023 Activity Attended IROS 2023, an inspiring experience in robotics and autonomous systems research.
Apr 2023 Paper Remote Identification Trajectory Coverage in Urban Air Mobility Applications was accepted to ATM 2023.
Apr 2022 Paper Barrier Certified Safety Learning Control was accepted to IEEE CCTA 2022.
Feb 2022 Paper Sum-of-Squares Program and Safe Learning was accepted to ASCC 2022.
Feb 2022 Paper Probabilistic Region of Attraction Estimation was accepted to CCDC 2022.
Aug 2021 Award E-Learning Platform received the People's Prize and Silver Award at the Teaching & Learning Innovation Expo 2021 at CUHK.

At a Glance

4
Core Hobbies
fishing, swimming, football and soccer
4
Projects
From production recsys to autonomy
10
Papers
LLM, Privacy, Recommendation Systems, Reinforcement Learning