Joona Piirainen
Senior Software Engineer at Taito.ai
Helsinki, Finland
Summary
👤
Senior🎓
Top SchoolJoona Piirainen is a Senior Software Engineer based in Helsinki with about six years of hands-on experience building and maintaining business-critical software across consultancy and product environments. He has helped accelerate client teams’ delivery and ways of working at Reaktor and moved into senior engineering roles at Taito.ai, bringing practical expertise in delivering reliable systems. Joona is active on GitHub and enjoys exploring programming languages and mathematics, often applying those interests to improve code quality and architecture. Colleagues know him as a thoughtful technologist who balances pragmatic engineering with a curiosity for theory. Outside work he writes code for fun, reads research papers, and recharges with his corgi and partner—an indicator of his focus on sustainable work-life balance. He’s open to new connections and collaboration, reachable at joona.piirainen@gmail.com.
6 years of coding experience
5 years of employment as a software developer
Ylioppilastodistus, Ylioppilastodistus at Mäkelänrinteen lukio
Finnish, English
Github Skills (20)
agda9
haskell8
ui-testing8
type-theory8
interpreter8
programming-language8
proof-assistant7
dependent-types7
chrome7
proof7
shell6
automation6
scripting6
clojure5
typescript5
Programming languages (6)
Github contributions (5)
japiirainen/fp
Oct 2022 - Feb 2023
A small, weird and unpractical programming language.
Contributions:1 release, 76 commits, 4 PRs in 3 months
programming-languagehaskellinterpreter
japiirainen/japiirainen
Jan 2021 - Apr 2025
Contributions:104 pushes, 1 branch in 4 years 3 months
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