I'm René Klačan and I love building software.

I am a husband, father of two, and a T-shaped software engineer with experience in designing and working on large-scale systems.

I'm co-founder of FirstLook.gg, a platform that helps game studios manage their playtesting.

Previously I was CTO at FetLife, a kinky social network which is with more than 1M daily active users, one of the largest Rails applications in the world.

I am also creator of AoE4 World, the largest community website for Age of Empires 4 game.

During my spare time, I love to be active, currently mainly lifting weights and running. But I also enjoy cycling, hiking, climbing, and yoga.

While I have plenty of experience with frontend and infrastructure, my biggest passion is backend development, systems architecture, and performance optimization throughout the whole stack. In other words, I love building scalable, performant, reliable, and cost-effective systems.

My language of choice is Rust but I'm comfortable working with pretty much any language and I believe in always using the right tool for the job.

I have experience managing small teams but it is something I don't enjoy nor am I exceptionally good at, so I only want to focus on what I love the most - building great software.