About Me

I am a manager at OpenAI, working on AI infrastructure and building engineering teams.
Before OpenAI, I worked at Robinhood, Google, Clari, and Oracle, across financial platforms, cloud infrastructure, analytics, and storage systems.

I received my Master's Degree in Computer Science from Columbia University in 2013, and my Bachelor's Degree in Software Engineering from East China Normal University in 2011. My undergraduate research focused on program verification and parallel concolic testing.

Experiences & Projects

• OpenAI — Manager
  Working on AI infrastructure and leading engineering teams.
• Robinhood — Manager
  Led engineering teams working on platform infrastructure and reliability.
• Google — Software Engineer
  Worked on large-scale cloud infrastructure.
• Clari — Software Engineer
  Built analytics and forecasting products, including work on live-query charting and machine learning.
• Oracle — Software Engineer
  Worked on storage systems and blocked I/O in the Solaris kernel.
• BlackRock — Summer Intern
  Worked on the Aladdin platform, analyzed SQL queries for a Cassandra data model, and designed a Java library for concurrent ingestion of live trading records.
• Columbia University — Teaching Assistant
  Teaching assistant for COMS 4115 Programming Languages and Translators, taught by Professor Alfred Aho. Mentored five teams on their language design and implementation.
• C Analysis and Unit Testing (CAUT)
  Researched parallel concolic testing during my undergraduate studies. Co-designed and implemented two parallel models, evaluated them through analysis and experiments, and published work on one of the models.

Publications & Patents & Contribution

• GPT-5 — OpenAI contribution
  Credited as Mark Sun in the contributor list for OpenAI's GPT-5 launch. [Official announcement]
• OpenAI o3 and o4-mini — OpenAI contribution
  Credited as Mark Sun in the contributor list for OpenAI's o3 and o4-mini launch. [Official announcement]
• A Parallel Approach to Concolic Testing with Low-cost Synchronization.
  Xiao Yu, Shuai Sun, Geguang Pu, Siyuan Jiang, and Zheng Wang.
  Electronic Notes in Theoretical Computer Science, Vol. 274, 2011, pp. 83–96. [PDF] · [DOI]
• Method and system for predicting task completion using machine learning.
  Lei Tang, Shuai Sun, and Xin Xu. US Patent 10,430,239 (2019). [Patent]
• Method and system for two-dimensional charting using live queries.
  Matthew King and Shuai Sun. US Patent 10,235,685 (2019). [Patent]

Miscellaneous

Outside work, I enjoy time with my family and our Shiba, photography, travel, movies, soccer, basketball, and badminton.
I also spent a year studying at Essence International School in Kaduna, Nigeria, from 1996 to 1997.

My new blog is under construction.

Last modified on Oct 16, 2026. Copyright © Mark Shuai Sun.