The mission

AI made building
software 10× cheaper.

A shift that large isn't a discount on the old way of working — it changes which kinds of companies can exist, and which ones win. Sirideain Ventures is a one-person incubator built to find out what the new ones look like.

The thesis
When the cost of building drops by an order of magnitude, the old playbook doesn't just get cheaper. It stops being the winning one.

I spent two decades in software — I co-founded Modus Create, scaled it to an acquisition, and was CEO through 2025. Before any of that, I trained as a fine artist (BFA, Corcoran School of Art). By most measures I was done; the sensible next move was to advise, invest, and work on my 1969 VW Beetle.

Instead I got interested in a question I couldn't put down. AI has cut the cost of building software by something like 10× — and a change that large doesn't just make the old way cheaper. It changes which kinds of companies can exist at all, and which ones come out ahead. The moats, the headcounts, the org charts we built whole industries around were answers to constraints that are quietly going away.

So I'm starting over, as small as it gets: one person, with AI as the team I used to have to hire, building real products to find out what the winning shape actually is now. I'm calling it Sirideain Ventures — an incubator of one.

Each product is a genuine bet, not a demo — and each one tests a different idea about where advantage lives when building is this cheap. Some I build; some are founders I back. The portfolio is the experiment; the products are how it gets run.

I'm doing it in the open — the wins, the misses, the method — because the interesting question isn't whether any single product succeeds. It's whether one person can build well at this scale now, and what that says about everyone else who's about to try.

That's the bet. You're welcome to watch.

Patrick Sheridan — Founder, Sirideain Ventures
A small structure, run as an experiment.
Three commitments hold the whole thing together — and each is testable against what actually ships.
1
One operator, AI as the team
The configuration under test: a single founder running a portfolio with AI doing the work that used to take a company. If that holds, a lot of received wisdom about how software businesses have to be built stops holding with it.
2
A portfolio of bets, each its own thesis
Every product is a real bet about where advantage lives in the new economics — not a demo, and not all the same idea. Some I build; some are founders I back. The point isn't any one outcome; it's what the set of them reveals.
3
Built in the open
The wins, the misses, and the method, in public. The useful question isn't whether a single product works — it's what one person building well at this scale says about what's coming for everyone else.
Who's behind it
Patrick Sheridan
Patrick Sheridan
Founder · Builder · Investor
Founder of Sirideain Ventures. Former co-founder and CEO of Modus Create, a global product engineering consultancy. Trained as a fine artist (BFA, Corcoran School of Art); builder at the intersection of technology and craft. LinkedIn
In the open

It's an open
experiment.

The bet gets made in public — the products, the results, and the reasoning behind them. The portfolio is where you can see what's been built so far; everything else is a work in progress, on purpose.