Web & app development · London

Fast by design.

We're a London web & app development studio building fast websites, online shops and iPhone apps — engineered for speed, Google rankings, security and AI with React & Next.js.

600+ projects·98% happy clients·Sidcup, Bexley · London, UK

Most agencies assemble websites.
We engineer them.

No templates, no page builders — every screen is hand-built from fast, reusable React components. Scroll down to see what's under the hood.

Scroll to explore
Under the hood

One page, on the surface.

Built from fast React components.

brain-code.co.uk
<App />
<Navbar />
<Hero />
<Features />
<Footer />
<Navbar /><Footer />
React · Frontend
component UI
Node.js · API
REST & GraphQL
AI · Integrated
smart features built in
Built with
React · Frontend
component UI
Node.js · API
REST & GraphQL
100
Lighthouse
performance
TS
TypeScript
type-safe code
Security
hardened & safe
AI · Integrated
smart features built in
Why BrainCode

More than just fast.

Speed is only the start. Every product we build is engineered to rank on Google, stay secure, and put AI to work for your business.

Blazing performance

Sub-second loads and green Core Web Vitals on every build.

Secure by design

Best-practice security, data protection and reliable hosting.

Ranks on Google

Technical SEO from day one — clean markup and structured data.

AI, built in

Smart search, chatbots and automation, integrated into real products.

Recent work.

handyninja.co.uk
Handy Ninja — Website
Featured project

Handy Ninja

Website · London, United Kingdom

Corporate website for HandyNinja, a wooden window & timber door specialist in Sidcup, South East London — a bold dark interface with service pages, a quote flow and blog, built to win local enquiries.

Key result
49
ReactNext.jsTurbopackTailwind CSSSSR / RSC
FAQ

Frequently asked questions.

How much does a website cost?

Every project is priced individually, because a one-page landing site and a full web app are very different jobs. Tell us what you need and we'll send a clear, itemised quote — no hidden extras. Most small business sites start in the low thousands; larger apps and online shops scale from there.

How long does it take to build a website?

A focused marketing site typically takes 2–4 weeks from kick-off to launch; online shops and web apps usually run 6–12 weeks depending on scope. We agree a fixed timeline up front and keep you updated at every milestone so there are no surprises.

Do you build iPhone apps as well as websites?

Yes. We build iPhone (iOS) apps with React Native — fast, native-feel apps that we design, build and ship to the App Store for you. We also build progressive web apps when that's the better fit for your project.

What technologies do you use?

We build on the modern JavaScript stack — React, Next.js and TypeScript on the front end, Node.js, NestJS, GraphQL, PostgreSQL and Prisma on the back end, deployed on Vercel and AWS. We also integrate AI features such as smart search, chatbots and RAG pipelines when they add real value.

Will my website rank well on Google?

We engineer for search from day one: clean semantic markup, fast sub-second load times, green Core Web Vitals, structured data and a sitemap. Technical SEO gets you a strong foundation — paired with good content, that's what wins rankings. We can advise on content and keywords too.

Do you work with clients outside London?

We're based in Sidcup, Bexley and serve businesses across London and the whole of the UK. Most of our work happens remotely with regular calls, so location is rarely a barrier — we work with clients wherever they are.

Can you redesign or speed up my existing website?

Absolutely. If your current site is slow, dated or hard to update, we can rebuild it on a fast, modern stack — keeping what works, fixing what doesn't, and getting you back into green Core Web Vitals so visitors stay and Google rewards you.

Do you offer ongoing support and maintenance?

Yes. After launch we offer support and maintenance plans covering updates, monitoring, security and small changes, so your site stays fast, secure and current. We're a long-term partner, not a build-and-disappear agency.

Let's build
something fast.

Tell us your idea and we'll come back with a clear plan and an honest price — usually within a day.

Email us
info@brain-code.co.uk
Find us
Sidcup, Bexley · London, UK
Response time
Usually within a day
Free quote·No obligation·Senior engineers — no juniors·Clear fixed timeline