Etsy's Year in Review is one of the most animation-heavy moments in the app. For years it shipped on Lottie. This year, the team rebuilt it entirely with native Flutter animations, and dropped a third-party dependency in the process. This talk is the story of that migration, told by the engineer who shipped it and the trainer who helped the team get there. Filip will walk through the technical decisions: which Lottie compositions translated cleanly to AnimationController and Tween, which ones needed CustomPainter or implicit animations, and where Flutter's animation primitives forced the team to think differently about motion design. Jorge will cover the enablement side: how a team that had leaned on Lottie for years built fluency in native Flutter animation fast enough to ship a flagship feature on it. You'll leave with a concrete decision framework for when to drop Lottie, a tour of the Flutter animation patterns that did the heavy lifting in Year in Review, and a realistic picture of what it takes to upskill a production team on motion. Most useful for engineers and engineering leaders weighing the same tradeoff on their own apps.