Aaron Treinish

Independent iOS developer & consultant

Good ideas.
Great iOS apps.

I’m Aaron Treinish, an iOS developer and consultant. I build native apps with Swift and SwiftUI and help teams modernize existing products, with 7+ years of hands-on experience.

Let’s talk about your project

Available for consulting & contract work

My work

Apps and tools I’ve helped build, from independent launches to products used by millions.

VIZ Media · 2021–present

Shonen Jump &
VIZ Manga

Sole iOS engineer for two manga apps serving millions of readers worldwide.

I modernized a decade-old codebase with Swift and SwiftUI, rebuilding the reader, navigation, data, and download systems while maintaining 99.9% crash-free users and sessions.

View Shonen Jump
Shonen Jump App Store preview of the manga reader

Shonen Jump · App Store preview

ChampDex app icon TokSpot app icon Anime Reference app icon

Independent apps

Apps I’ve shipped myself.

10+ consumer apps, including ChampDex, TokSpot, and Anime Reference, with 100,000+ combined downloads. I own the entire journey, from the first idea to launch and ongoing updates.

Explore my apps

iOS development & consulting

Senior experience. Practical support.

Build a new app
Native iOS development, from architecture and implementation to testing and App Store release.
Improve an existing app
SwiftUI migration, legacy code modernization, performance improvements, and new features.
Support your team
Senior engineering support, architecture reviews, SDK development, and focused project work.

The person behind the work

An engineer.
A product person.

I care about making apps that are useful, feel natural to use, and are built to last. My experience spans consumer entertainment, video conferencing, retail, and communication, with roles at VIZ Media, Visionable, KWI, and TextNow.

I work with Swift, SwiftUI, UIKit, and Objective-C. I’m comfortable taking ownership of a whole app or working alongside a team on the part that needs attention.

Have an iOS project in mind?

Let’s make it happen.

Tell me what you’re working on and where you could use a hand.