MVP development · Startups

MVP development for startups, built to prove the numbers

Most MVPs fail before a line of code is written — they're scoped as small products instead of big experiments. I'm James, a senior UK developer and fractional CTO. I help founders cut the build to what actually tests the idea, then build it properly: fixed price, code you own, and no agency layers between you and the person doing the work.

Book a free scoping callSee real MVP costs
How it works

From idea to evidence in four steps

  1. Step 1

    Impact Sprint

    We pin down the result worth proving, cut the feature list to what proves it, and produce a scope a developer can quote from.

  2. Step 2

    Fixed-price build

    A senior engineer builds the MVP — no juniors, no hand-offs. You see progress in working software, not status reports.

  3. Step 3

    Launch & measure

    Shipped to real users with the analytics to prove or disprove the idea. App Store submission handled if it is a mobile MVP.

  4. Step 4

    Iterate or scale

    When the numbers say go, the same codebase grows into the product — architecture chosen so you never face a rebuild.

MVP app development, done by a senior engineer

Whether it's a SaaS product, a marketplace or a mobile app, the standard is the same: an MVP lean enough to ship fast, on foundations solid enough that success doesn't mean a rebuild.

  • Scoping that cuts the build to what actually tests your riskiest assumption
  • Senior full-stack engineering — web, mobile or both, chosen honestly
  • Production-grade foundations: auth, payments, analytics, deployment
  • You own the code and the infrastructure from day one
  • A fixed price agreed before the build starts
  • Fractional CTO support available when you raise or hire
Web application developmentMobile app developmentFractional CTO

Free guides before you spend anything

I've written up the scoping and costing process in full — use it even if you never hire me.

MVP development questions, answered honestly

How much does MVP development cost for a startup?
A focused MVP typically lands between £10,000 and £30,000 depending on scope — and the scoping work exists precisely to keep you at the bottom of that range. I publish honest cost breakdowns on the blog, and every build is a fixed price agreed upfront, not a day-rate estimate that drifts.
How long does an MVP take to build?
Most MVPs I build ship in 6–12 weeks from an agreed scope. The Impact Sprint before it takes about two weeks and is usually what saves you a month of building the wrong thing.
Should my startup build a web app or a mobile app first?
Usually web-first — it's cheaper, faster to iterate, and avoids app-store friction while you're still learning. But it depends on where your users are. I build both, so the recommendation isn't biased towards either.
I'm non-technical. How does this work?
That's the most common case. You get plain-English explanations, working software to react to every week, and honest advice on what not to build. Many clients keep me on as a fractional CTO after launch for exactly this reason.
What happens if the MVP proves the idea?
The codebase is built to grow — proper architecture, tests and infrastructure from day one, not a throwaway prototype. When you're ready to scale or raise, nothing needs rebuilding and I can support the technical side of due diligence.

Got an idea to prove? Scope it first.

A free 30-minute call. I'll tell you what your MVP should cost, what to cut, and whether you should build it at all.

Book a free scoping call