Company
The Vertical Engine model
Fusion, Build, Grow, Handoff — the four-move model behind how Fusapp OÜ builds vertical SaaS products on one shared engineering core.
Fusapp OÜ is a Tallinn, Estonia-based company built around a simple idea: don't rebuild the engineering core for every product. Instead, fuse people, software and AI into one shared foundation — identity, infrastructure, discipline — and build focused, vertical SaaS products on top of it.
We're not a portfolio of unrelated bets. Every product we ship starts from the same engine, which means faster starts, consistent security and observability, and a team that gets better at building the next product because of the last one.
Our first live vertical is MarbleMap, a no-commission, sealed-bid B2B marketplace for natural stone. It's a real product with real usage today, not a pitch deck.
This blog is where we'll write about how we build, what we learn, and where the Vertical Engine goes next.