The technical-first startup has a solid idea and the ability to build it. They reach a working product faster than most, often well beyond what someone with only an idea could manage. But they frequently have not understood the market, or who would pay, or how much to charge. The product is good and goes nowhere.
The commercial-first startup is the mirror image. Someone sees a gap, knows exactly who they are selling to and for how much, and hires a developer to build to spec. The plan is sound. What is missing is deep knowledge of the sector, so the product can miss what users actually need, and it tends to cost more than it should along the way.
The domain-expert startup is the one I see most in health. A clinician or pharmacist knows the problem precisely and what a good answer looks like. They outsource the build, but without technical and commercial oversight they can end up with something that works for a small group and never travels, sometimes carrying security or design flaws that nobody was there to catch.
Where it works
Success happens when the three meet. Rarely in one person, and that is the point: it happens in the room. At Personalised Diagnostics we try to bring all three together from the start, whether the business is travel health, diagnostics or veterinary. A real commercial case, the technical judgement to build it properly, and domain experts who keep us honest about the problem we are actually solving.
Most startups that fail had a perfectly good idea. What they were missing was one of the three pillars, and they found out too late.
If you are starting something, the useful work is to be honest about which of the three you are weakest in, and to bring in someone to cover it before it costs you. The strongest pillar is rarely the one that decides whether you make it.