Developer Advocate at RevenueCat
Helsinki, Finland
Experienced React Native developer with a strong background in mobile app development and user experience design. Specializing in creating performant cross-platform applications with modern JavaScript and TypeScript. Currently working as a Developer Advocate at RevenueCat, helping developers monetize their apps.
Not available for hire
A guide to React Native meetup groups worldwide: Helsinki, London, New York, Berlin, and beyond. How to find your local community, what to expect, and how to start your own.
Developer Advocate at RevenueCat
The complete guide to React Native conferences in 2026. App.js Conf, React Summit, Chain React, React Universe Conf, React Native Connection, and React Native London. Dates, locations, CFP deadlines, and first-hand tips.
Developer Advocate at RevenueCat
A practical comparison of React Native and Flutter in 2026. Learn why React Native is often the smarter choice when your team already knows React and TypeScript.
Developer Advocate at RevenueCat
Building a great Android app takes time, creativity, and persistence. But once your app is live, there's one question every developer eventually faces: how do I actually make money from this?
Developer Advocate at RevenueCat
A look at how to combine React Query with FlatList, FlashList, and LegendList for smooth, stable list UIs. Best practices for handling loading states, skeletons, and safe areas.
Developer Advocate at RevenueCat
A personal recap of App.js 2025: speaking about in-app purchases, highlights from Krakow, favorite talks, and why this conference remains one of my top picks.
Developer Advocate at RevenueCat
Learn how to optimize your React Native app for better performance. Covers re-renders, memoization, list optimization, image handling, and profiling tools.
Perttu Lähteenlahti
Master animations in React Native. Learn the Animated API, React Native Reanimated, gesture handling, and how to create smooth, performant animations.
Perttu Lähteenlahti
Your complete guide to starting React Native development in Finland. Learn about the community, resources, meetups, and how to connect with Finnish RN developers.
Perttu Lähteenlahti
A comprehensive comparison of Expo and bare React Native. Learn when to use each approach, the trade-offs involved, and how to make the right choice for your project.
Perttu Lähteenlahti
Comprehensive look at in-app purchases and how to add them to your React Native app. Covers different types of in-app purchases, how to set them up in your app, and the psychology of good in-app purchase experiences. Technology used: React Native, RevenueCat, App Store Connect.
Developer Advocate at RevenueCat
Full article version of the talk I gave at RTC.ON Conference 2024 about getting started with WebRTC in React Native
Developer Advocate at RevenueCat
Customize the React Native Developer menu to your needs using the built in addMenuItem function.
Developer Advocate at RevenueCat
How to fix the 'VirtualizedLists should never be nested inside plain ScrollViews with the same orientation' warning in React Native using ListHeaderComponent and ListFooterComponent.
Developer Advocate at RevenueCat
Let´s draw a nice looking analogue clock in React Native with SVG
Developer Advocate at RevenueCat
This article is based on a lighting talk I gave at React Day Berlin in 2019. Learnings are from prototyping Nyxo app.
Developer Advocate at RevenueCat
There is no need to start Xcode to test on different React Native apps on different device simulators. You can do that easily with the simulator flag.
Developer Advocate at RevenueCat
Checklist for publishing React Native app to Apple App Store successfully.
Developer Advocate at RevenueCat