William Zeng

xai

Co-founder

2026Member of Technical Staff· xAI

Founder · since 2023

Company

xAI

Role

Member of Technical Staff

current

Stage

—

no public source

Raised

—

no public source

Based

—

Founder / co-founder — the company's markEmployee / research role

Profile coverage5 of 7 · missing posts, contact

Sweep

The best AI coding assistant for JetBrains

Experience

Career

xAI
Member of Technical Staff · 2026 – Present
2026
Sweep
Co-founder
Cofounder/CEO · San Francisco, California, United States · 2023 – 2026
2023
Roblox
Senior Machine Learning Engineer · 2023
2023
Roblox
Software Engineer II · 2022 – 2023
2022
Roblox
Software Engineer · 2021 – 2022
2021
Roblox
ML Engineer Intern · 2020
2020

Youngest senior MLE at Roblox. Cumulative 10% CTR lift on games search. Stats/ML at CMU. Building Sweep, a Cursor alternative for JetBrains.