Joseph Mattiello - Founder at RxRealm

Joseph Mattiello

Founder at RxRealm

New York, New York, United States

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Summary

🤩

Rockstar

🎓

Top School

Joseph Mattiello is a founder and seasoned software engineer with 15+ years building consumer-facing multimedia apps and leading mobile platforms from startup to enterprise. He blends hands-on iOS/Swift expertise with deep Unix/Linux backend experience, shipping everything from emulation frontends (Provenance, one of the most followed standalone iOS open-source apps) to high-performance POS and news apps at companies like SALIDO and News Corp. As an open-source maintainer he revived and modernized prominent projects such as Hero and contributes to RxSwift community libraries, demonstrating a knack for CI/CD, release management, and long-term project stewardship. He’s comfortable across design, secure coding, and low-level work (ARM/Arduino, C++), which lets him optimize full-stack systems and media pipelines. Joseph often operates at the intersection of product ownership and engineering, stepping into roles that require rapid debugging, cross-team coordination, and pragmatic architecture decisions. Based in New York, he runs Matti Media, the umbrella for Provenance and related projects, balancing community-driven OSS with commercial engineering practice.

15 years of coding experience

16 years of employment as a software developer

BS Computer Science, BS Computer Science at University at Buffalo

Stackoverflow

Stats

134reputation

87kreached

2answers

0questions

Github Skills (13)

debugging10

uid10

objective-c10

debug10

swift10

maintenance10

ios10

front-end-development10

ui-design10

device-emulation10

emulation10

tvos9

constants6

Programming languages (16)

C#PowerShellC++RustCObjective-C++TeXVue

Github contributions (5)

SideStore/SideStore

Sep 2021 - Jan 2023

SideStore is a fork of AltStore that doesn't require an AltServer.

Role in this project:

iOS Mobile Developer

Contributions:45 reviews, 125 commits, 73 PRs in 1 year 4 months

Contributions summary:Joseph primarily contributed to the `sidestore/sidestore` repository by implementing changes related to the iOS application's functionality and UI. They made various code adjustments, including fixing spelling errors, updating URLs, and refactoring code for improved efficiency. The user was also involved in fixing warnings, updating APIs, and integrating features, particularly related to the application's core components and user interface elements. Additionally, the user implemented changes across multiple files related to the UI and application behavior.

dotnetrequirealtstoresideloadios

HeroTransitions/Hero

Oct 2019 - Oct 2022

Elegant transition library for iOS & tvOS

Role in this project:

Mobile Developer (iOS)

Contributions:8 releases, 11 reviews, 86 commits in 3 years

Contributions summary:Joseph's commits primarily focus on removing Swift files from the framework bundle products. They also involve modifying and deprecating certain UIViewController, UINavigationController, and UITabBarController properties within the Hero framework. Furthermore, the user addresses documentation generation and incorporates fixes within the examples directory.

ios-transitiontransitionioscustom-transitionscarthage

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