Hi, I'm Jared. I build iOS apps and bring AI models on-device.

By day I work on iOS at eBay. By night I run Haplo — shipping indie apps, writing open-source for on-device LLMs and diffusion, and publishing iOS-ready quantizations of open models on HuggingFace.

See what I've made → What I'm reading
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Currently shipping at eBay/ Eight Haplo apps on the App Store/ 11 OSS repos under HaploLLC/ 34 model releases on HuggingFace/ iOS · macOS · Swift · on-device AI/ Always reading/ Currently shipping at eBay/ Eight Haplo apps on the App Store/ 11 OSS repos under HaploLLC/ 34 model releases on HuggingFace/ iOS · macOS · Swift · on-device AI/ Always reading/
// where i've worked

Five-ish years on iOS, give or take.

Most of it on Apple platforms. Some of it on things that fly.

[01]
eBay
Senior iOS Engineer. On-device AI integrations, Visual Intelligence App Intents, and a patent-pending dynamic UI framework.
2021 — now
→
[02]
Haplo, LLC
Founder & engineer. Indie iOS apps, open-source for on-device AI, and 30+ iOS-ready model quantizations on HuggingFace.
2021 — now
→
[03]
L3 Technologies
Software engineering lead on defense systems firmware.
Fall 2020
→
[04]
Huck Adventures
iOS development intern.
Summer 2021
→
// also B.S. Mechanical Engineering, minor Mathematics · Baylor University · 2021
// a few things i'm proud of

Recognition from the day job.

Small wins worth keeping a note of.

2025
eBay AI Award
For implementing Apple's Visual Intelligence App Intent APIs in the eBay app.
2025
Patent Pending
Inventor of a dynamic, section-based UI system that generates layouts from JSON.
2025
Apple Foundation Model Workshop
Selected to attend a workshop at Apple HQ on foundation models and feature prototyping.
2023
Oregon Innovation Challenge
Winner — grant for an AR platform for creating and sharing interactive presentations.
// stack

Tools I reach for most days.

Mostly Apple-platform stuff, with a fair amount of Python on the side.

Swift SwiftUI UIKit Objective-C Xcode SwiftData Foundation Models Core ML Core Animation Metal ARKit Python TensorFlow llama.cpp GGUF Quantization HuggingFace GraphQL Firebase Git
// building in public

A few recent tweets.

Five highlights from @JC_builds. Scroll →