Available now for lead roles Remote
AI at every step after the idea
17 years of iOS, and now I build whole products with AI coding agents like Claude Code, Codex, and Cursor, owning the product decisions and the review. I was the sole iOS developer on Rumble Studio, and I built Autodemia and Men of Hunger solo, AI features included.
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I built Rumble Studio for iOS from scratch as its sole developer, then shipped every update on iPhone and iPad. The same iPad app runs on Vision Pro, with custom UI so eye tracking can highlight each control.
2,000+ creators adopted Studio by May 2024. Some who went live with it:
More creators in the Studio case study“The Rumble Studio feature is incredible. Effortless streaming on multiple platforms at the same time.”
Building now
AutodemiaAn AI study partner that remembers what you’ve learned. Every subject becomes a concept map, and what you master in one counts in the others.autodemia.io Visit 
Men of HungerA community for men centered on honest conversation, accountability, and personal growth.menofhunger.com Visit Also building Greenlane, a Mac tool that finds Apple App Review issues before you submit, built for Men of Hunger’s iOS app.
Meet Marv
Marv is the AI assistant I built for Autodemia and Men of Hunger. He’s the same character in both, plain and direct, but he does a different job in each.
On AutodemiaOn every screen
Ask from anywhere (⌘J). He already knows the lesson, question, or card you’re on.
Explains and checks
Answers from your own sources with checked citations, and grades your work without handing you the answer.
Builds things to try
Makes interactive widgets with sliders and challenges, and finds real images to learn from.
Talk or argue
Talk to him out loud, or argue with him: he takes a wrong side and you have three turns to change his mind.
On Men of HungerCatch me up Case study
Briefs a long thread from its replies, images, and the public profiles of the people in it. It’s his main job.
Chat and current events
Message him, or @marv him in a thread or group. He knows what’s happening on Men of Hunger right now and searches the web for the news.
Tasks and a morning brief
Hand him a task and he checks his own work before calling it done. Your morning brief only arrives when something changed. Anything he’d change for you waits for your OK.
For admins
Answers questions about site data and analytics, and drafts newsletters, report reviews, and verification calls for a person to approve.
He gets better on his own in both. Once a day he reviews how his answers landed, from corrections, pushback, and reactions, and writes himself plain-language lessons. Nothing private makes it into them.
The personal side of building
I build with AI at work, but I also use it to solve problems at home, preserve family history, and keep track of my finances.
I’m building an AI biographer for my memoir. Custom tools connect letters, photos, stories, and interviews through a graph of people and relationships, developing the book, a wiki, and a family tree.
Letters add a voice. Connections give it context.
I use household agents with my wife, connecting Linear home tasks, calendars, and email. A morning brief helps us get going. Evening wins help us close the day.
What’s coming up. What needs attention.
I use AI to organize my income, spending, expenses, and assets into a clearer picture of my finances.
Less scattered. More understandable. Illustrative workflow · no account data
Career
2009 to today. Drag through it, or use the arrow keys.
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CallinRumble2023 – 2026
Lead iOS Developer (Studio) · Senior iOS Developer (Video)
Sole iOS developer for Rumble Studio, a livestreaming app that streams to six platforms at once, adopted by 2,000+ creators by May 2024. Built it from scratch to the App Store with the backend and design teams, set the iOS technical direction, and owned every update on iPhone, iPad, and Vision Pro.
Joined via Callin acquisition · May 2023
Excerpt from James Whitney’s recommendation
…John single-handedly built the Rumble Studio app from the ground up.
James WhitneyStudio Lead at RumbleManaged John at Rumble Read the full recommendation I'm seeking a remote, full-time Lead or Staff Product Engineer role, ideally building AI-powered products. I'm also open to hands-on mobile leadership roles at smaller companies.
I take on select contract projects: product launches, AI features, architecture reviews, and improvements to existing products across iOS, web, and APIs.
Outside of tech Husband 3 kids and counting Landlord
