JoeMatt - Overview
Joseph Mattiello
Engineering Leader · Mobile Architect · AI/LLM Tooling
NYC · 17+ years iOS · 3 US patents · Creator of Provenance EMU
About
I started writing iOS apps before Apple released the SDK, hacking together Objective-C on jailbroken hardware. Currently L4 Mobile Engineer on Wayfair's App Infrastructure team. Previously Director of iOS Platform at NewsCorp (8-region global team — WSJ, NY Post, Times UK, Knewz). Hold 3 US patents from Sense Networks. Creator of Provenance EMU — the most popular open-source multi-system emulator for iOS, tvOS, and macOS — now on the App Store with 388k+ downloads.
💼 Considering 1–2 consulting engagements for Q3 2026 — Mobile AI Launch Readiness Audit · 3 weeks · $25–35K fixed-fee · iOS engineering meets AI infrastructure
📊 Live operational metrics — joemattiello.dev/status (Lighthouse, security headers, OSS impact — re-audited on every deploy)
Currently building
- Provenance — multi-system iOS/tvOS/macOS emulator, App Store launch Jan 2025, 6.3k⭐, 79 contributors, 9.3k Discord members, 388k+ GitHub release downloads
- Multi-agent CI orchestration across the Provenance org — Claude (Sonnet+Opus auto-routed by static diff analysis) + Cursor + Kimi sharing one dispatch vocabulary. Case study →
- Atari Jaguar 240p Test Suite — bare-metal m68k port of Artemio Urbina's 240p Test Suite. Built end-to-end with Claude Code + Copilot/Qodo as adversarial reviewers. 36 PRs in 10 days, ~84% AI co-authored. PR #27 (PAL pass) · smoke-test CI
- virtualjaguar-libretro — maintainer; first open-source Atari Jaguar CD emulation. 28 merged PRs.
- AI tooling at Wayfair — custom MCP servers, Claude skills/plugins, n8n workflows for the App Infrastructure team supporting 60+ mobile engineers
Open source highlights
| Repo | Stars | Role | What it is |
|---|---|---|---|
| Provenance-Emu/Provenance |  |
Creator · Lead | iOS/tvOS/macOS multi-system emulator. App Store. |
| HeroTransitions/Hero |  |
Admin · Maintainer | Custom view-controller transitions for Swift. |
| libretro/virtualjaguar-libretro |  |
Maintainer | First OSS Atari Jaguar CD emulation. |
| JoeMatt/atari_jaguar_240p_test_suite |  |
Maintainer · AI-built | Bare-metal m68k Jaguar — built with Claude Code. |
| RxSwiftCommunity/RxRealm |  |
Maintainer | RxSwift bindings for Realm. |
| CoreOffice/XMLCoder |  |
Major contributor | Codable XML parsing in Swift. |
Other notable contributions: RetroArch (Apple platform drivers — camera, microphone, CoreMIDI, CoreLocation) · SideStore (org member, 21 merged PRs) · swift-corelibs-foundation · Mono / Xamarin (CoreMIDI, CoreAudio, Foundation C# wrappers for MonoMac) · GLideN64 · mupen64plus-core · UTM
Press & recognition
- mobilegamer.biz (Apr 2026) — featured developer interview in the 2-year App Store emulator retrospective
- 9to5Mac, iMore (exclusive), Time Extension, Android Authority, AppleInsider, Pocket Gamer (dedicated hub)
- YouTube coverage: TWiT (2.3M subs), ETA PRIME (2.2M), Spawn Wave
- Earlier: Newsweek cover ("The Next Google" — Sense Networks, 2009), Bloomberg Businessweek "25 Most Intriguing Startups", New York Times, CNN Money
US Patents
- US 8,224,766 — Comparing spatial-temporal trails in location analytics
- US 8,620,624 — Event identification in sensor analytics
- US 9,571,962 — System and method of performing location analytics
Patent portfolio acquired twice — by YP/YellowPages in 2014, then by Verve in 2017.
Get in touch
| If you're… | Best path |
|---|---|
| Hiring for Head of AI Platform / VP Eng / Director / CTO | LinkedIn DM |
| Looking for a consultant for a Mobile AI Launch Readiness Audit | joemattiello.dev/consulting/ |
| Curious how I work | Case studies (Wayfair · NewsCorp · Cameo · AI multi-agent CI) |
| Press, podcasting, or speaking | LinkedIn or joemattiello.dev |
Site, status dashboard, and consulting offer are all open source — see joematt.github.io.