MVP Development
From idea to market-ready product in 4–8 weeks. Fixed price. Full-stack development with AI features for UK startups and founders.
Everything to Launch and Validate
Full-Stack Product
Complete web or mobile app — frontend, backend, database, auth, and deployment. Production-ready from day one.
AI Features Included
GPT-4, Claude, or specialist models integrated where they add real value to your product — not as an afterthought.
Fixed Price, No Surprises
Agreed scope and fixed price before we start. You know exactly what you get and what it costs.
Live in 4–8 Weeks
We work fast without cutting corners. Agile sprints with weekly demos so you see progress every step.
MVP Types We Specialise In
What a Project Looks Like
Every project is scoped and quoted after a free discovery call, so you get a fixed price for your situation rather than a number that assumes someone else’s. These are the shapes most engagements take.
Lean MVP
Founders testing whether anyone wants this at all.
Typical timeline: 4 weeks
- One core job done end to end
- Landing page and onboarding
- Payments if you charge
- Analytics to learn from users
Standard MVP
A validated idea that needs two or three connected features to be usable.
Typical timeline: 6–8 weeks
- Two to three connected features
- Admin dashboard
- AI feature where it adds value
- Post-launch iteration sprint
Complex MVP
Marketplaces and multi-sided products with integrations and compliance.
Typical timeline: 8–12 weeks
- Marketplace or multi-sided products
- Integrations and compliance
- Mobile plus web
- Investor-ready metrics
Timelines are typical and depend on how many systems are involved and how ready your data is. Tell us what you need and we will give you a fixed price and a date.
Scope to Launch
Scoping Sprint
One day to define the exact feature set, user flows, and tech stack. Output: a fixed-price proposal and timeline.
Design
Wireframes and UI design for sign-off. We design for your users, not for us.
Build
Two-week sprints with weekly demos. You see real, working software — not just updates.
Launch
Deploy to production, configure domains, set up monitoring. Your MVP is live and ready for users.
Frequently Asked Questions
What is included in an MVP?
An MVP includes core user flows, backend API, database, authentication, and the specific features that validate your business hypothesis. We scope the minimum feature set that lets real users test real value — nothing more, nothing less.
How long does an MVP take?
We target 4–8 weeks for most MVPs. Simple single-feature products can launch in 4 weeks. More complex multi-sided platforms or AI-heavy products typically take 6–8 weeks. We define the scope clearly up front so you know the timeline before we start.
Do you offer fixed pricing?
Yes. We agree the scope and fixed price before any work begins. No surprise invoices. If you want to expand scope mid-project, we discuss it as a change order with a clear price.
Can you add AI features to an MVP?
Yes — and we recommend it for most products. We can integrate GPT-4 or Claude for text generation, AI chatbots, smart search, recommendation engines, or any AI workflow relevant to your product.
What tech stack do you use for MVPs?
Next.js + React for web, React Native for mobile, Node.js for APIs, PostgreSQL for data, and Vercel or AWS for hosting. We use TypeScript throughout for maintainable, scalable code from day one.
Do you help with post-launch growth?
Yes. After launch, we offer ongoing development retainers for feature additions, performance improvements, and scaling. Many MVP clients stay with us as their products grow into full businesses.
Who owns the code and the accounts?
You do, on completion and full payment — the repository, the hosting, the domain, the app store accounts if there are any, all set up in your company name rather than ours. For a first product this matters more than for anything else we build, because an investor will ask, and an MVP you cannot hand to another team is not an asset.
How do we know you will still be here in two years?
You should not need us to be. We build on mainstream frameworks another developer can pick up rather than anything proprietary, everything runs on your accounts, and the handover includes documentation written for whoever comes next. Big Berri Limited is registered in England and Wales, company number 16562429. Ask any agency what happens to your product if they close, and take a vague answer as the answer.
Read before you buy mvp development
- MVP Development
How Long Does It Take to Build an MVP in the UK? The Clocks You Control and the Ones You Do Not
The honest answer is weeks for the build and months for the things around it. What decides the timeline, the external clocks nobody can shorten, and how to read a supplier’s estimate.
- MVP Development
The Best No-Code Tools for an MVP, and When to Write Code Instead
An honest comparison of Bubble, Glide and a coded build on substance rather than price: what each is genuinely good at, where each stops, who maintains it, and the four signals that tell you no-code has run out of road.
- MVP Development
What Decides What It Costs to Build an App in the UK? A 2026 Guide
A straight answer on what drives app development cost for UK businesses in 2026 — the scope decisions that matter, the features that move a quote up or down, the ongoing costs nobody mentions on the sales call, and how UK agencies compare with freelancers and offshore teams.
- MVP Development
MVP Development for UK Startups: Cost, Timeline and How to Scope It Right
What an MVP costs in the UK, what actually counts as one, build vs no-code vs in-house compared, and the UK-specific practicalities founders miss.
What you can hold us to
Plenty of agencies close this part of a page with client logos. We do not publish any, because we will not put a name or a number on this site that we cannot evidence. What follows instead is what you can check in a public register, and what sits in the contract either way.
What the discovery call actually is
Thirty minutes, free, no obligation and no salesperson. You describe what is costing you time or customers, we ask about the systems involved, and you leave with an honest view of whether this is worth doing. We regularly end that call by saying the tool you already pay for covers it.
You own the result
The code, the repository and the accounts are set up in your company name rather than ours, and they are yours on completion and full payment. Nothing runs on infrastructure we control, so ending the relationship does not end the thing we built.
A fixed price, never a day rate
Every project is quoted as a fixed price with a written scope after the call, so an over-run is our problem rather than yours. If the scope changes, we say so and re-quote before doing the work, not after.
Where your data sits
In the UK or EU, under a data processing agreement, kept only as long as you specify. Any model provider we rely on is named as a sub-processor rather than left implicit, and we will tell you plainly where something you have asked for would put a commitment of yours at risk.
What happens when it goes wrong
Agreed before launch rather than negotiated during an incident: what is covered, how quickly we respond, and what counts as new work. Every build has a defined escalation to a person, because the failure that costs you is the one nobody noticed.
Two things you can check
Big Berri Limited is registered in England and Wales, company number 16562429, and registered with the Information Commissioner's Office under reference ZC119995. Both are public registers. Look us up rather than taking our word for it.
Got an Idea? Let's Build It.
Book a free 30-minute scoping call. We'll tell you what an MVP costs and how long it takes — no obligation.
Book a Free Scoping Call