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Duo Ding

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Engineering & Research Leader at Cresta
📍 Menlo Park, California, United States

Duo Ding is an AI Engineering and Research Leader at Cresta, specializing in LLM training and AI agent workflows. An alumnus of Carnegie Mellon University, he previously held senior roles at Perplexity and Apple, where he scaled NLP and search systems for over a billion users.

He has a strong interest in the academic side of technology, following institutions like the MIT Media Lab and his alma mater, Carnegie Mellon University, closely.

He co-authored a technical blog post on using Reinforcement Learning to significantly improve the mathematical reasoning capabilities of LLMs.

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Experience
16 Years
Current Role
Engineering & Research Leader
Job Level
Mid-senior
Location
Menlo Park, California, United States
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Priorities

Topics Duo cares about

AI Agent Workflows
His current team at Cresta focuses on enhancing the quality of AI Agent workflows, such as agentic RAG, for real-world business applications.
LLM Reasoning
Showcases deep expertise in improving model reasoning, particularly for complex tasks like mathematics, using advanced Reinforcement Learning techniques like PPO and DPO.
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Career

Work history

1-2026
Engineering & Research Leader
Cresta
1-2025 - 12-2025
Head of Post-Training Team
Perplexity
1-2024 - 1-2025
Senior Director of Engineering
Stealth AI startup
2022 - 2024
Senior Engineering Manager
Apple
2020 - 2022
Engineering Manager
Apple
In the press

Media appearances

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Education
Master
Carnegie Mellon University
2007 - 2011
Bachelor
Shanghai Jiao Tong University
Social presence
in
Behavioral profile

DISC profile (public)

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