Dag Ågren
Staff Software Engineer, IOS at Wolt
Helsinki Metropolitan Area Finland
Summary
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Rockstar🎓
Top SchoolDag Ågren is a Staff iOS Engineer based in Helsinki with 15+ years building everything from embedded firmware to polished iOS and macOS apps. He combines low-level systems and reverse-engineering skills with a strong eye for UI/graphics—recent work focuses on Swift and 3D/graphics concerns while still shipping production iOS features at scale for Wolt. A long-time indie developer, he has released commercial Mac and iOS apps (The Unarchiver, Xee³, Toot!) and single-handedly built mobile apps for startups, showing product-minded end-to-end ownership. He’s also an active open-source contributor (notably implementing core encode/decode logic and optimizations for the popular blurhash project) and prefers mercurial workflows on Heptapod, reflecting a pragmatic, tooling-aware approach to engineering.
15 years of coding experience
23 years of employment as a software developer
Master's degree, Physics, Master's degree, Physics at Åbo Akademi
Stackoverflow
1,114reputation
19kreached
11answers
8questions
Github Skills (15)
uiimage10
swift10
image-processing10
algorithms9
algorithm9
xcode8
color-theory8
objective-c6
command-line-tool6
ios6
bcrypt6
uiviewcontroller6
thread-safety6
multithreading6
uinavigationbar6
Programming languages (19)
Github contributions (5)
woltapp/blurhash
May 2017 - Feb 2020
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:103 commits, 18 PRs, 28 pushes in 2 years 10 months
Contributions summary:Dag primarily focused on implementing the core functionality of the `blurhash` library. They were responsible for creating the initial encoding and decoding mechanisms, which involved significant changes to the `Encode.swift` and `Decode.swift` files, and demonstrating the library's use via a playground. Further contributions included optimizing the encoding process for string representation and improving the decoding and display processes. These improvements involved a linear color space and a more optimized quantization of AC values.
representationcompact
sre/wifimcu-template
Aug 2015 - Feb 2016
Contributions:73 commits in 5 months
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