Education
Bachelor’s degree in IT with a specialisation in media informatics and app development.
iOS · Swift · SwiftUI · UIKit
Hi, I’m Krisztian.
App Developer
Over seven years in the Apple ecosystem. From the first idea to the App Store, I build iOS apps that simply feel right.
My Philosophy
“Your work is going to fill a large part of your life, and the only way to be truly satisfied is to do what you believe is great work. And the only way to do great work is to love what you do. If you haven’t found it yet, keep looking. Don’t settle. As with all matters of the heart, you’ll know when you find it.”
About me.
iOS developer based in Cologne, with a soft spot for buses, trams and everything that gets people from A to B. I like building my apps solo — from the very first idea through design to release — convinced that good software never gets in your way: it just works, clearly, quickly and reliably.
Professional experience
Four years of experience as a tester in mobile development. Over seven years of experience as an iOS developer.
Personal track record
Several self-built apps in the public-transport and city-services space across two European countries, with over 9,000 monthly active users combined.
Specialisation.
At home in the Apple ecosystem for over seven years. My focus is modern Swift — from SwiftUI and Swift Concurrency to SwiftData and Swift Package Manager.
- Swift Core language
- SwiftUI Declarative UIs
- Swift Concurrency async / await
- SwiftData Persistence
- Combine Reactive
- UIKit Proven & flexible
- Swift Package Manager Dependencies
- watchOS Companion apps
- Xcode Daily driver
Projects.
My own apps
Public Transport Timisoara
iOS · 2017, 2019, 2025 – 2026
4.2
App Store rating
5.9k
monthly active users
KVBike
iOS · 2018, 2022, 2025 – 2026
3.6
App Store rating
2.3k
monthly active users
Kölner Müllabfuhrkalender
iOS · 2019 – 2021
4.0
App Store rating
600
monthly active users
GeldKompass
iOS · 2019 – 2020, 2025
3.3
App Store rating
204
monthly active users
Budapest Tömegközlekedés
iOS · 2025 – 2026
No ratings yet
App Store rating
95
monthly active users
Bonn Rhein-Sieg Bike
iOS · 2019, 2026
3.0
App Store rating
68
monthly active users
Kölner Bus & Bahn
iOS · 2021 – 2022, 2025 – 2026
2.9
App Store rating
47
monthly active users
Berliner Bus Tram & U-Bahn
iOS · 2022, 2025 – 2026
4.0
App Store rating
36
monthly active users
Basler Bus & Tram
iOS · 2021 – 2022
No ratings yet
App Store rating
28
monthly active users
Bonner Bus & Bahn
iOS · 2021, 2026
5.0
App Store rating
25
monthly active users
Luxembourg Bus & Tram
iOS · 2021, 2026
2.3
App Store rating
12
monthly active users
Contributed to
POSTIDENT
iOS · 2022 – present
4.8
App Store rating
built during full-time employment at Seven Principles Mobility GmbH
I’d love to hear from you.
Have a project in mind, or just want to say hi? Drop me a line — I’ll get back to you soon.