Codex
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OpenAI
2026.07 - present
Yongjun Chen
Systems and Products
Coding agents
Improved coding-agent reliability via context, tools, delegation, and failure analysis; explored training lower-cost subagents with multi-agent RL.
Augment Code
2026.01 - 2026.07
Apple Intelligence
Worked on early-stage model development behind initial product launches, including Writing Tools and Reply Suggestions.
Apple
2022.09 - 2025.12
About
working on Codex at OpenAI; previously worked at Augment Code, Apple and Salesforce AI Research; studied Statistics in Wuhan and Computer Science in Washington State.