The Kotlin ecosystem continues to grow among the world's most recognized brands, including Meta, AWS, Duolingo, Uber, and others. At KotlinConf 2025, these companies took the stage to share practical, real-world engineering stories.
KotlinConf is where developers can learn directly from the teams building products at global scale. Software engineers showcase how they are tackling challenges in navigation, performance, cross-platform architecture, build tooling, and large-scale migrations. These sessions offer rare, firsthand insights into how industry leaders use Kotlin to solve complex problems in production.
Learn directly from the teams building products at global scale. Join KotlinConf'26 and connect with engineers from the world's leading brands.
Here's a look at some of the standout talks from KotlinConf'25 and the global brands behind them.
Real-world Kotlin use at scale
From navigation systems and build tools to AI-driven migrations and cross-platform architectures, global brands are using Kotlin to solve engineering challenges at massive scale.
1. AWS
Blueprints for Scale: What AWS Learned Building a Massive Multiplatform Project | Matas Lauzadis, Ian Botsford
The AWS team shared firsthand insights from designing, developing, and scaling the AWS SDK for Kotlin – a massive multiplatform project spanning over 300 services and targeting eight distinct platforms. They discussed the challenges they faced, the best practices they adopted, and the strategies that succeeded (and failed) at AWS scale.
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2. Duolingo
Duolingo + KMP: A Case Study in Developer Productivity | John Rodriguez, Johnny Ye
Duolingo ships weekly to more than 40 million daily active users across 176 countries, and Kotlin Multiplatform is playing a growing role in how they move fast. In this talk, the team discussed how they delivered features like Video Call, Math, and Adventures across Android, iOS, and web, which upcoming projects may benefit from KMP, and the challenges faced and lessons learned along the way.
3. Google
Deploying Kotlin Multiplatform at Google Workspace | Jason Parachoniak, Troels Lund
The Google Workspace team discussed the bugs, performance issues, and areas for potential optimization while rolling out Kotlin Multiplatform for certain users. The session included real comparisons with Objective-C, insights into the fixes they implemented, and a Q&A session with the developers who worked on the project.
