Ian Wong

Ian Wong is co-founder and CEO of Summation, which builds AI analysts and decision tools for finance and operations teams. He previously co-founded Opendoor and served as its CTO, and was Square’s first data scientist, working on fraud detection. His writing reflects on lessons from building data systems, models, and internal software at those companies.

Career

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Based in: Bellevue
Elsewhere

Summation

Feb 2024 — Present

Co-founder and CEO

Opendoor

Co-Founder & Technical Advisor
Aug 2022 — Feb 2023
Bellevue, Washington, United States
Co-Founder & CTO
Apr 2014 — Aug 2022
San Francisco, California, United States

Prismatic

2013 — 2014

Software Engineer

Stanford University

PhD

Products & media

ianwong.co

From Doer to Reviewer

How fraud detection at Square combined human review, pattern discovery, and machine-learning models—and how that approach carried over to Opendoor.

Writing

ianwong.co

Build, then Buy

A reflection on Opendoor’s decision to replace parts of a custom-built CRM with Salesforce, and what the experience taught him about building versus buying software.

Writing

review.firstround.com

Operations vs. Algorithms: Advice for Scaling Startups

A conversation about integrating data science into a startup, building a data science team, and lessons from scaling Opendoor.

Media appearance

itshipped.fm

Effective and Scalable Machine Learning

A discussion of predictive and descriptive machine learning, human-in-the-loop prediction, and building data science teams for business impact.

Media appearance

fueltalent.com

The X Factor Is Almost Always Will

A conversation tracing his path through Square and Opendoor to Summation, including his views on hiring and the problem that led him to start Summation.

Media appearance

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Ian Wong

Summation

Opendoor

Co-Founder & Technical Advisor

Co-Founder & CTO

Prismatic

Stanford University

Products & media

From Doer to Reviewer

Build, then Buy

Operations vs. Algorithms: Advice for Scaling Startups

Effective and Scalable Machine Learning

The X Factor Is Almost Always Will

Curated Lists

List Inclusions