Kreis Labs
Ruby on Rails, RSpec, PostgreSQL, Swift, SwiftUI, SwiftData, Swift Testing, Docker and more
- Developer experience
- 16 years
- Ruby on Rails
- 13 years
- Swift and SwiftUI
- 2 years
- Products shipped
- 4
- Location
- Germany
Sixteen years of experience in software development, the last thirteen on Ruby on Rails. I built systems for payments, contracts and medical records. Since 2025 I ship my own apps end to end: SwiftUI client, Rails API, App Store release and marketing. I released four products on the App Store, for iOS and macOS. For the backend I used Ruby on Rails and deployed using Kamal on Hetzner.
Prompt the AI in incremental steps, I review the result and I loop over this until I get the desired result in terms of UI/UX and code quality.
GitHub Bluesky X/Twitter Instagram Threads
© 2026 Kreis Labs. Made in EU
-
Moondane
iOS app · SwiftUI · SwiftData · iCloud sync · App Store
Budget tracker for iPhone. Log an expense in seconds, tag it, and see where the month went. No bank account link. Data stays on the device and syncs through iCloud.
-
RatingKit
iOS SDK · SwiftUI · Rails API · MIT
A review sheet for iOS apps. Happy users go to the App Store prompt. Unhappy users write to you first, so you can fix the problem before it becomes a one-star review. The SwiftUI client is open source under MIT. The backend is a hosted Rails API.
-
Typefall
iOS game · SpriteKit · SwiftUI · Game Center · App Store pre-order, out October 13, 2026
A word drop puzzle for iPhone. Letters fall one at a time. Spell a word across or down, tap it, and the letters drop away. No ads, no account, and it works offline.
Let's get in touch