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  1. Meet a Duo: André Kenji Horie, Senior Software Engineer

    Meet André Kenji Horie, a Senior Software Engineer who has been at Duolingo for three years. André came all the way from Brazil to Pittsburgh, with a few years in Tokyo in between. We asked André about where he's from, what it's like to work at Duolingo and what he thinks about living in Pittsburgh.

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  2. Rewriting Duolingo's engine in Scala

    Recently, we profoundly refactored the engine that drives Duolingo lessons. This post talks about our engineering choices, experiences, and the pain points of rewriting a highly complex system.

    Highlights:

    • Redesigned architecture
    • Refactored code from Python to Scala
    • Latency dropped from 750ms to 14ms
    • Engine uptime increased from 99.9% to ...

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  3. How we learn how you learn

    At Duolingo, our goal is to make language learning fun and effective. We think the best education should be full of play, so we're constantly developing new features that make learning new things — and practicing old things — feel like a game! At the same time, we're serious about taking a scientific, data-driven approach to all of our products, and about sharing what we learn with the world. In this post, we'll take a look at the science behind the Duolingo skill strength meter, which we published in an Association of Computational Linguistics article earlier this year....

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