Jim Van Zummeren
Lead IOS Developer at Easy Calendar
Haarlem, North Holland, Netherlands
Summary
👤
Senior🎓
Top SchoolJim Van Zummeren is a Lead iOS Developer with 11 years of experience crafting high-performance, user-centered mobile apps and leading teams from Haarlem, Netherlands. He combines deep interaction-design roots with pragmatic engineering—prioritizing smooth UX, maintainable testable code, and secure data handling across large client projects like major private banks and international airports. Jim excels as the bridge between backend engineers and UX designers, challenging teams to reach better outcomes while keeping delivery on schedule. He’s driven by creating apps that feel as natural as paper (demonstrated by the 500,000-download Easy Calendar project) and by coaching developers to grow in ways that boost both happiness and productivity. In his leadership role he focuses on scaling iOS team practices and consistency, not just individual skill.
11 years of coding experience
7 years of employment as a software developer
Bachelor's degree, Communication and Media Studies, Bachelor's degree, Communication and Media Studies at Amsterdam University of Applied SciencesInteraction design, Interaction design at Mediacollege Amsterdam
English, Dutch
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (38)
markdown10
parser10
ios10
cocoapods10
uitextview9
currency9
phone-number9
android-app9
android9
automation9
android-apps9
uitextfield9
swift8
xcode8
ruby8
Programming languages (2)
Github contributions (5)
M2mobi/Marky-Mark
May 2016 - Jan 2023
Markdown parser for iOS
Contributions:17 releases, 8 reviews, 20 commits in 6 years 9 months
iosmarkdownparser
jvanzummeren/Marky-Mark
May 2016 - May 2016
Contributions:3 pushes, 1 branch in 1 day
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