
I'm Perttu Lähteenlahti, I like building things.
I've always needed to make things with my hands. Started as a carpenter, somehow ended up writing code, designed stuff along the way, and yeah—I've painted a few cars too (long story).
When I'm not working, I'm probably consuming some form of media. Movies, books, anime, games—the full geek package. Coding is weirdly relaxing for me, but when I actually need to step away from the screen, I'm either running or at the gym (the meathead in me needs the balance).
Then there's the apartment thing. I've been buying and renovating properties around Finland—7 so far. There's something deeply satisfying about doing the work yourself, seeing a place transform. Maybe it's the former carpenter in me that can't let go.
Career-wise, I've bounced between startups, corporations, and consultancies. Started four companies along the way (with varying degrees of success, let's say). My bread and butter is React and React Native—web and mobile stuff. I like projects that make me slightly uncomfortable. Worked with some cool clients: Adidas, Nokia, Yle, Fingrid, Alma Media.
Recent Writing
I write about React Native, mobile development, and building products.
What I'm reading in 2026
January 26, 2026
Flights of 2025
December 31, 2025
Check if user has other iOS app installed in SwiftUI
December 13, 2025