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1:03:10ENGrowth in the Physics of a Market: Lessons from Gojek, Kumu and Southeast Asia's Super AppsGuest Crystal Widjaja · Host Lenny RachitskyCrystal Widjaja, who built Gojek's growth team and now leads product at Kumu, shares scrappy experiments, retention benchmarks, analytics pitfalls and hiring advice.
1:28:32ENInside Duolingo's Streak: What 600+ Experiments Taught One Retention TeamGuest Jackson Shuttleworth · Host Lenny RachitskyDuolingo group product manager Jackson Shuttleworth walks through the history, wins, wrong turns and operating habits behind the single feature he calls the company's biggest growth lever.
1:44:26ENFind the Must-Have Users First: Sean Ellis on Product-Market Fit and Sustainable GrowthGuest Sean Ellis · Host Lenny RachitskyThe creator of the Sean Ellis test and the ICE framework explains how to measure product-market fit, learn from the users who love you, and then grow in the right order.
1:25:25ENExplore, Exploit, Retain: How Albert Cheng Grows Duolingo, Grammarly and Chess.com-Style Subscription ProductsGuest Albert Cheng · Host Lenny RachitskyA veteran of three of the best-loved consumer subscription apps explains his explore-and-exploit framework, what retention really demands, and why he wants 1,000 experiments a year.









