公司：duolingo
多邻国（英语：Duolingo；/ˌdjuːoʊˈlɪŋɡoʊ/ DEW-oh-LING-goh）是美国一个语言学习网站及应用程序。该公司以免费增值模式营运：网站及应用程序皆免费使用，但也有提供付费升级版本。
截至2021年6月，多邻国提供了40种语言共106种的语言课程，也有许多语言课程正在开发中。
How we used Macros to Promote MVVM architecture adoption
随着iOS代码库的扩展，团队采用MVVM架构并引入Swift宏来减少重复代码。宏在编译时生成代码，优化了DataSource组件的实现，降低了手动编写和测试的工作量。尽管宏能提升代码质量和开发效率，但也存在搜索不便和复杂性较高的缺点。通过优化构建流程，团队减少了宏包的编译次数，目前已生成4300多行宏代码，显著提升了开发效率。
How we boosted Android app performance (and DAUs!)
Duolingo通过优化Android应用性能，显著提升了用户体验。团队采用A/B测试，聚焦关键转化指标如应用打开成功率，并通过自动化方法追踪识别性能瓶颈。通过延迟非关键任务、分段加载课程数据、优化网络请求等策略，减少了应用启动时间，提升了日活跃用户数。特别关注感知延迟，如立即展示会话完成界面，后台处理数据，有效降低了用户等待时间。最终，应用打开转化率提升至94.7%，5秒以上延迟用户降至8%。
How we used AI to speed up content production by 5X
Duolingo用AI革新语言学习内容生产！传统人工编写课程耗时巨大，新系统通过"生成-评估-筛选"三模块实现自动化。AI生成句子后，评估模块检查语法、逻辑和难度，筛选合格内容。关键突破在于：1）减少人工干预；2）AI更擅长检查而非创作；3）系统可观测性至关重要。目前已成功应用于西班牙语课程，未来将扩展至意大利语和中文。这套方案让课程开发效率飙升，质量更有保障！
多邻国、耐克和亚马逊如何通过奖励机制让用户欲罢不能
应用程序通过奖励系统提升用户参与度和留存率，但有效的奖励应与用户内在动机和实际成果结合。好的奖励应具意义、真实感，并与用户目标相关，如多邻国的连击系统和领英的进度条。避免过度奖励，保持惊喜感，使奖励系统自然融入用户体验，真正促动人心。
How server-driven UI keeps our shop fresh
A single backend response can do a lot more than you think.
Teaching Owlgebra: developing math on Duolingo
What's our formula for creating the math course? We'll tell you!
Behind the metric: how we developed “Time Spent Learning Well”
Duolingo优化学习和增长的关键指标是时间学习良好度（TSLW）。他们通过一系列措施提高TSLW，如优化每日任务的顺序、改变每月挑战的基准、调整XP奖励与学习效果的比例等。他们发现，延长学习时间、增加新内容以及避免学习者疲劳对TSLW有积极影响。Duolingo的目标是帮助学习者实现自己的学习目标，持续改进TSLW有助于实现这一目标。
Dear Duolingo: What's the right level of difficulty?
Are you up for a little challenge? Here's what makes something the right level of difficulty for a learner!
Can I use ChatGPT to practice a new language?
Chatbots promise a lot of exciting things—but do they make good conversation partners?
How a sense of urgency leads to growth at Duolingo
These are the 5 principles that guide Duolingo's growth strategy!
A little spring cleaning: reducing the app size by 20%
Our app size had steadily increased since 2020 at roughly 50MB per year. It was time for some spring cleaning!
How Duolingo uses AI to create lessons faster
Duolingo's human teaching experts are using AI to make new lessons faster than ever!
平原期实现4年内DAU增长4.5倍，Duolingo是如何做到的？
已经有很多产品从 Duolingo 身上汲取了灵感。
Meaningful metrics: How data sharpened the focus of product teams
Our Data Science team developed a growth framework that helped to grow DAUs by 4x since 2019. Let’s explore the path that led us to that framework, aka The Growth Model!
Meaningful metrics: How data sharpened the focus of product teams
Our Data Science team developed a growth framework that helped to grow DAUs by 4x since 2019. Let’s explore the path that led us to that framework, aka The Growth Model!
Interning with Duolingo: bringing our characters to a new dimension
We love our summer interns, and we’re particularly proud of our Thrive Program, an 8-week program that provides second-year students from communities underrepresented in tech the chance to develop their technical skills and experience life at Duolingo.
Our Thrive interns always get to work on incredibly impactful projects, and their work lives on long after they leave! Meet Monica, whose work with the art and design team included bringing a brand-new animation technique to the company!