Hang Wu in

Hang Wu

Observer · DISC type ci
Member of Technical Staff at Perplexity
📍 Menlo Park, California, United States

Hang Wu is a machine learning specialist at Perplexity, focusing on LLM post-training and reward hacking. A Ph. D. graduate from Georgia Institute of Technology, his expertise is in reinforcement learning, which he previously applied at scale as a Staff Research Scientist at ByteDance to enhance user personalization systems.

He has a consistent track record of applying machine learning to solve complex problems, from improving video compression speed at Google to enhancing medical image segmentation at Intuitive Surgical.

Unique fact: He describes his career focus on optimizing complex systems with the phrase, "different rewards, same hacking. "

Read the full overview →
Experience
7 Years
Current Role
Member of Technical Staff
Location
Menlo Park, California, United States
Personality Overview

How Hang shows up

Example Seeker
Value Driven
Curious

They are likely to ask many questions and look heavily for supporting information. They can sound friendly and charming but can quickly change gears to become inquisitive and probing. They are generally good communicators and can be hard to convince.

Priorities

Topics Hang cares about

LLM Alignment
His current role at Perplexity involves "reward hacking" for large language model post-training, a critical component of ensuring AI systems align with human intent.
Applied Reinforcement Learning
At ByteDance, he architected and scaled the end-to-end infrastructure for RL-based user personalization models for platforms like TikTok.
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Career

Work history

9-2025
Member of Technical Staff
Perplexity
9-2020 - 10-2025
Staff Research Scientist
ByteDance
8-2015 - 5-2020
Graduate Research Assistant
Georgia Institute of Technology
5-2018 - 8-2018
Software Engineer Intern
Google
5-2017 - 8-2017
Machine Learning Intern
Intuitive Surgical
In the press

Media appearances

No media yetWe could not find public media appearances for this person.
Education
2015 - 2020
Doctor of Philosophy (Ph.D.)
Georgia Institute of Technology
2010 - 2014
Bachelor of Engineering (B.Eng.)
Tsinghua University
Social presence
in
Behavioral profile

DISC profile (public)

c

Calculativeness (C)

Calculativeness (C) reflects the degree to which a person is likely to be cautious, systematic and analytical. Those scoring high tend to emphasise quality and accuracy.

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