Hello! My name is Miikka Koskinen. I live in Helsinki, Finland. You might know me by the handle arcatan.

Professionally

I’m a software engineer working as an independent consultant. I have extensive experience in cloud and backend development, especially in Python, Rust, and Clojure. My previous employers include Oura Health, Metosin, ZenRobotics and Futurice. I have a Master of Science degree in mathematics from University of Helsinki.

Internet presence

• Read my tech blog at quanttype.
• Read my outdoors newsletter at Small Rapids.
• Follow me on Mastodon.
• Look at my code on GitHub.
• Look at my photos on Flickr and on Instagram.
• Check out what I have been reading recently.

Public speaking

The talks I’ve given about software engineering:

• 2025-06-11: Compressing floating point data with Gorilla, Helsinki Python Meetup
• 2025-02-28: Why S3’s conditional writes made people excited (lightning talk), HYTRADBOI
• 2024-09-19: You should write a blogpost (lightning talk), Heart of Clojure
• 2019-02-23: Pointfree Clojure (lightning talk), :clojureD
• 2017-10-25: Data, the Ultimate Abstraction, Helsinki Clojure Meetup
• 2016-09-27: Implicit Configurations, Helsinki Haskell User Group
• 2015-09-24: 20th century functional programming, Helsinki Haskell User Group