DeveloperWeek 2021 DeveloperWeek 2021
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PRO WORKSHOP (ProductWorld): Building Sticky User Experiences - Lessons Learned about What Works for Push, in-App Messages, and Email

- PST
ProductWorld Stage D

Zack Hendlin
OneSignal, VP of Product

Zack is VP of Product at OneSignal, overseeing product, design and user research. He spearheaded the company’s development of in-app messaging, advanced analytics, data integrations, and self-serve billing which have now made OneSignal the leading messaging provider for 900K+ people, delivering more than 6.5 billion messages a day.
Prior to OneSignal, Zack was a product manager at Facebook where he shipped their first work in speech recognition, their first mobile-first ads format, and worked on improving newsfeed relevance. At LinkedIn, Zack worked on newsfeed, internationalization, and voice / location messaging. Zack holds a BA in statistics and economics from UC Berkeley (with honors) and a MBA from Massachusetts Institute of Technology’s Sloan School of Management.


Every day, OneSignal sends more than 8 billion messages. Looking at this aggregated data provides deep insights into what works and what doesn’t when it comes to keeping users coming back to your app or website.
In this session, I’ll cover what works and what doesn’t from learnings across 100 BN+ messages and show hands on how to use push notifications, in-app messages, email, track important outcomes, and use personalization to build great products that drive engagement.
I’ll also share insights learned from being a product manager at both Facebook and Linkedin about building engaging user experiences.