John Peña

Cto

Hatch · New York, New York, United States

Present

Hatch was acquired by Yelp in January 2026

Senior Engineering Manager, Platform

Rippling · New York, New York, United States

Cto and Cofounder

Correlated · New York City Metropolitan Area

Built lead propensity scoring for CRMs. Acquired by Rippling in 2024.

Senior Engineering Manager, Platform

Lime · San Francisco, CA

EM for Infra + Platforms, worked with an amazing group of people to produce Lime's API platform, partnerships, governmental technologies, and data services.

Founding Engineer

MAX · San Francisco Bay Area

Built the first header bidding platform for mobile. MAX was acquired by AppLovin in 2018.

Staff Software Engineer

Twitter · San Francisco Bay Area

Built Twitter's ad exchange and scaled it to 50 billion ads served a day.

Software Engineer

MoPub (acquired by Twitter) · San Francisco Bay Area

Early member and senior contributor to many of MoPub's engineering teams. I worked on a variety of systems and projects and helped MoPub scale to billions of ad requests per day.

Software Engineer

Baseline Ventures · San Francisco

I worked as an engineer in residence, helping to build several SaaS and web products.

Software Engineer

Duke University Visualization Technology Group · Durham, NC

Developed interactive virtual reality programs for the Duke Immersive Virtual Environment (DIVE)

Intern

Duke University Office of Information Technology