About Quantum Craft
We are a small, senior and growing team in London.
Company details
Quantum Craft is a software and AI development agency in London.
We build software products and AI features, and our AI consultancy helps UK companies adopt AI safely. The team has more than two decades of production software experience.
Last reviewed
The company number links to the public register, where you can check the legal details.
- Legal name
- Quantum Craft Ltd
- Company number
- 15942103 (opens in a new tab)
- Registered in
- England and Wales
- Based in
- London
- Team
- Small and senior, and growing
- Experience
- More than two decades of production software in the team
- Contact
- contact@
quantumcraft .uk
How the team works with you
Quantum Craft is a digital agency for software and AI rather than marketing, so everyone you meet on a project builds software.
An engineer from the first call
The people who scope your product are the people who build it, and you can meet them before you sign anything.
A senior engineer leading each build
They agree the specification with you before a build starts and sign off the architecture decisions after it, which is the work most expensive to get wrong.
Senior review on every change
Day-to-day changes pass a senior engineer's review and the automated tests before they merge.
Roles allocated to each engagement
A project manager, developers, senior developers and QA are allocated as the work needs them, and design joins where the product needs it.
Where the team's experience sits
- Software architecture
- Multi-tenant SaaS
- Offline-first field apps
- Payments
- Learning platforms
- AI in production
- Technical due diligence
The case studies describe the roles on each build.
Two rules we work to
- We write code like we're paying for it. Because eventually someone is. We put the hours into the parts a demo never shows, such as the tests and the documentation for whoever inherits the code, your next hire or us.
- You always know where you stand. Scope is agreed up front, in writing, with milestones. You won't get mystery invoices or quiet scope creep, and if something is slipping, you hear it from us first.
What we do
How long the work takes, as the cards below state it, on one scale in weeks: the AI-built app audit, about a week; a focused MVP, 6 to 12 weeks; the core build of BlueWave and Karu, about 14 weeks. The consultancy card gives the fee of its first step and no length, so it is not here.
- 1. AI-built app audit, about a week
- 2. A focused MVP, 6 to 12 weeks
- 3. BlueWave and Karu, core build, about 14 weeks
AI product development
We build new products and MVPs, SaaS platforms, mobile apps and AI features inside products you already run. A focused MVP typically takes 6 to 12 weeks, and larger platforms longer: BlueWave and Karu each had a core build of about 14 weeks. App, SaaS and MVP development has the price bands.
AI consultancy
We advise on where AI will pay in your business and where it will not, as the engineers who would build it. That covers taking a pilot into production, governance under the EU AI Act and UK GDPR, an AI use policy and technical due diligence for startups and their investors. The usual first step is an AI readiness assessment, from £4,950.
Fix an AI-built app
If an app built with Lovable, Bolt.new, Replit or v0 now handles money, health data or customer records, start with an AI-built app audit. It takes about a week, costs a fixed £3,500, and tells you what the app needs before it can carry real customers and what that will cost. Fixing an AI-built app explains how a rescue runs.
Engagements that continue past the build
After launch, we still work on most of the platforms we build. That is how we find out which of our decisions hold up.
- BlueWave is live, in use with six contractor organisations. The brief was field-service and compliance software for UK water-hygiene contractors, with an audit trail on every record.
- NForge is live. We were engaged to build business software for independent fitness coaches, with an AI programme generator that runs around thirty validation gates before a coach sees a plan.
- Karu is in build. The engagement covers a practice platform for UK therapists, designed for Google Cloud's London region, with clinical notes kept out of the search index.
What we will not do
- If a rule or a spreadsheet would handle a job better than AI, we turn the project down, and you hear that on the first call.
- We do not give legal advice. When a question needs a solicitor, we tell you, and we are happy to work alongside one.
- We do not name a client, or show their figures or screens, without their agreement. One of our six case studies is under NDA and stays anonymous.
- We do not quote a build until there is a written specification to price it from.
Questions about Quantum Craft
How do I choose the right software development agency in London?
Ask for evidence you can check. A good agency publishes case studies with timelines and prices, and can tell you who reviews each change before it ships. The code and accounts should sit in your name. Meet the engineers who would build your product before you sign, and start with a small first step at a price agreed in writing. Our own evidence is in the case studies.
What is Quantum Craft?
Quantum Craft is a software and AI development agency in London. Quantum Craft Ltd is a UK company, number 15942103, registered in England and Wales. The team is small and senior, with more than two decades of production software experience. The engineers who scope your product build it, and a senior engineer reviews every change.
How big is the team?
Small and senior, on purpose, and growing. Roles are allocated to each engagement, for example a project manager, developers, senior developers and QA, and design joins where the product needs it. Each case study describes the roles on its own build.
3 more questions
What happens if someone on our project is unavailable?
The project carries on from its records. The specification, decision records and tests can sit in your repository from the first commit, and the documentation is written as we build. Every change is reviewed before it merges, so another engineer, ours or yours, can pick up from the same records.
Where are you based, and do you work outside London?
London. And yes: we work with clients across the UK and Europe, remotely or on site for London teams. When a product's data needs to stay in the UK, we build it for UK hosting: BlueWave and Karu are both built for Google Cloud's London region.
Can we meet the engineers before we sign?
Yes. An engineer is on the first call, and before you sign anything you can meet the people who would build your product.
Tell us what you're building or deciding.
Tell us about a product you want built, or a decision about AI you need to make, and we'll set up a 30-minute call. You'll get a straight answer on what it would take.
What happens after you get in touch
We reply within one working day
By email, to arrange a time for the call.
A free 30-minute call
With a senior engineer, about what you are building or deciding.
The fee in writing first
If a first step is worth taking, you get its exact fee in writing before any work starts.