Speaker: Zhen Zhou

He / him / his

Software Engineer at @Duolingo, Previous Theoretical Computer Science Enthusiast @CMU

Zhen is a senior software engineer at Duolingo. He is a core member of the Growth Infrastructure team, which is responsible for backend microservices that fuels Duolingo’s vibrant social features and retention strategies.

He joined Duolingo in 2020 after graduating from Carnegie Mellon University. He is deeply passionate about designing and implementing robust backend infrastructure that directly impacts millions of users globally. He embraces challenges that come with evolving system designs and adapts services to meet the needs of a growing and diverse global audience.

Find Zhen Zhou at:


How We Created a High-Scale Notification System at Duolingo That Delivered Millions of Messages Within Seconds During a Super Bowl Commercial Break

Building a notification system may seem trivial, but what about building one that could reach million of users within a few seconds? What about doing that right after your advertisement airs?

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Monday Apr 8 / 02:45PM BST ( 50 minutes )


Fleming (3rd Fl.)


platforms Platform Engineering architecture scalability Reliability Asynchronous System Design Notification System Cloud Resource Management python