Klaas Annema

Almere, Flevoland, Netherlands

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Summary

🤩

Rockstar

🎓

Top School

Klaas Annema is a seasoned product engineer with 16 years of cross-platform experience shipping production iOS, Android, macOS and web applications for startups and design-forward products. He’s delivered key features at Sketch (bringing the Mac app back to the App Store and building signup/payment flows), led engineering to revive mobile and backend codebases, and maintained SDKs and apps at IPinfo. A pragmatic full-stack contributor, Klaas has a long history in open source—maintaining Cappuccino and improving SketchAPI and Stripe iOS components—often tackling platform-specific edge cases like M1 text alignment and nuanced UI behaviors. Based in the Netherlands, he excels at shipping reliable UX-driven systems across time zones and has a knack for resurrecting stalled projects into MVPs.

16 years of coding experience

15 years of employment as a software developer

Bachelor, Computer Sciences, Bachelor, Computer Sciences at Christelijke Hogeschool Windesheim

MBO, ICT, MBO, ICT at ROC van Twente

Information Sciences, Information Sciences at Saxion Hogescholen

English, Dutch

Stackoverflow

Stats

2,665reputation

304kreached

42answers

4questions

Badges

currency

top-5%

iphone

top-5%

localization

top-5%

Github Skills (46)

objective-c10

uiimageview10

javascript10

ios10

mobile-development10

apidoc10

ui-components10

objcective-c10

user-interface10

sdwebimage10

sketch-plugin10

ui-design10

apple-push-notifications10

interface-design10

push-notifications10

Programming languages (22)

Objective-JC++CSSRustCMakefileGoHTML

Github contributions (5)

cappuccino/cappuccino

Jan 2010 - Sep 2011

Web Application Framework in JavaScript and Objective-J

Role in this project:

Full-stack Developer

Contributions:355 commits in 1 year 8 months

Contributions summary:Klaas implemented visual feedback for dragging in CPTableView, including adding code to manage and display a drag view. They also integrated an outline view and addressed merge conflicts within various files, indicating involvement in code integration and feature development related to the application's user interface. Moreover, they refactored and implemented core functionality improvements across the application.

javascriptweb-applicationframeworkweb-application-frameworkapplication-framework

thoughtbot/Tropos

Apr 2016 - Jun 2016

Weather and Forecasts for Humans

Role in this project:

iOS Mobile Developer

Contributions:26 commits, 33 PRs, 66 pushes in 1 month

Contributions summary:Klaas primarily contributed to the iOS application by implementing features related to push notifications and background tasks. They integrated a third-party service, Courier, for handling push notifications, including subscribing to channels and managing time zone changes. The user also made changes to ensure weather updates are triggered correctly and implemented UI updates.

for-humansforecastsiosswift

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