AI development agency in Reading

AI-native digital agency. Powered by people. Accelerated by agents.

With over twenty years' experience, we design and build at the forefront of AI development: agentic marketplaces, AI-integrated SaaS and agent-powered websites.

2005

Code23 established

60+ five-star Google reviews

350+

Projects delivered

UK Based

Senior team, direct access

services

AI, SaaS, marketplace and web development

Six core service areas, one senior team from first brief through launch day.

01

AI Development

  • Agentic Development
  • AI Agents
  • RAG & Search
  • Workflow Automation
02

SaaS & Platforms

  • MVP Development
  • Portals & Dashboards
  • Business Systems
  • API Integrations
03

Marketplace Development

  • B2B Marketplaces
  • Service Marketplaces
  • Multi-vendor Commerce
  • Payments & Payouts
04

Websites & Apps

  • Corporate Websites
  • E-commerce
  • Mobile Apps
  • CMS Development
05

Product Design

  • Product Discovery
  • UX Research
  • UX & UI Design
  • Design Systems
06

Support & Growth

  • Managed Support
  • Performance & Security
  • SEO & Conversion
  • Continuous Development
featured work

Selected work

Products with AI in them, running in production for real clients.

View all work
Choose your route

What are you trying to do?

Launch a marketplace

Multi-vendor commerce, payments and payouts, built to transact from day one.

Set course →

Build a SaaS product

From MVP to a platform your customers rely on every day.

Set course →

Implement AI agents

Agents that do real work inside the systems you already run.

Set course →

Rebuild your website

Fast, findable and easy to run, with a CMS your team actually uses.

Set course →

Ship an MVP

A working product in weeks, scoped to prove the idea.

Set course →

Design a better UX

Journeys that convert, backed by research rather than taste alone.

Set course →

Grow your ecommerce

Storefronts that load fast, rank well and sell more.

Set course →

Automate a workflow

Kill the manual steps that eat your team's week.

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Rank higher on search

Technical SEO and content that compounds month after month.

Set course →

Harden your platform

Performance, stability and security, measured and fixed.

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Build a mobile app

One codebase, shipped to both stores.

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Get ongoing support

A senior team on hand after launch, not a ticket queue.

Set course →
drag

Trusted by product teams

"We've recently completed Phase 1 of a bespoke business valuation tool with James at Code23, and I've been extremely impressed. He took the time to understand both the commercial and technical requirements, communicated clearly throughout, and delivered a well-thought-out system."

Jason Atkins Director, Lansley Commercial
Delivery model

People lead. Agents build.

Senior specialists direct a fleet of agents across research, design, build and QA. Every decision is signed off by a person.

Senior lead Directs · Decides · Signs off

Research agent

Reads the market, the code and the data

Design agent

Drafts variants while designers direct

Build agent

Scaffolds, wires and tests in parallel

QA agent

Checks more than any manual pass could

Every decision and every release is signed off by a person

How we work

Map. Blueprint. Build. Launch. Evolve.

Clear decisions, working software early, and direct access to the people building it.

Step 1

01 - Map

We get clear on your users, business goals, existing systems and constraints. Then we identify what's worth building and where AI can help.

  • Users, goals, systems and constraints mapped

  • Where AI can genuinely help, and where it can't

  • Success measures agreed before anything is built

Department Tools
Process Tools

Step 2

02 - Blueprint

We shape the scope, product journeys, technical architecture and delivery roadmap. You'll know what we're building and why it matters.

  • Scope, journeys and architecture shaped together

  • A delivery roadmap you can hold us to

  • A clear price before build starts

Step 3

03 - Build

Designers and engineers work together in short cycles, sharing working software early. AI increases speed; people own the quality.

  • Working software shared from the first weeks

  • AI agents speed up research, build and checks

  • People accountable for every decision that ships

Live System
1,240 +70%
SUNMONTUEWEDTHUFRISAT

Step 4

04 - Launch

We prepare the product for production, launch carefully and learn from real usage.

  • Careful production launch, no big-bang risk

  • Feedback and analytics from real usage

  • Business results guide what we improve next

Department Tools
Process Tools

Step 5

05 - Evolve

We can keep supporting, optimising and extending the product, or hand it over cleanly to your internal team.

  • Support, optimisation and continuous development

  • Or a clean handover to your internal team

  • Code, documentation and knowledge included

Live System
1,240 +70%
SUNMONTUEWEDTHUFRISAT

Testimonials

What our clients say

Real reviews from our Google Business profile.

Google 60+ reviews →

We've recently completed Phase 1 of a bespoke business valuation tool with James at Code23, and I've been extremely impressed. He has taken the time to understand both the commercial and technical requirements, communicated clearly throughout, and delivered a well-thought-out system with a high level of flexibility. The admin dashboard, in particular, gives us full control over the scoring and valuation logic, which was a key requirement. I'm looking forward to working with James on Phase 2 and would have no hesitation in recommending him to anyone looking for bespoke software development – Jason Atkins, Director, Lansley Commercial

Jason Atkins Google review

We worked with Code23 in the Autumn of 2021 as a potential website development partner for our new company website. We immediately felt confident that Code23 could deliver a fantastic quality product and that they knew exactly what to do to take our digital presence to the next level. Fast forward 3 months, and with zero delays to our project, and we're delighted with our newly launched website. The styling, functionality and overall build quality is exceptional, and in the eight years that I've worked with web agencies, this is by far the smoothest migration and launch that I've been involved with. I would highly recommend Code23 as a website development agency.

Sam Roberts Google review

I've been Code23 client for 5 years (and my website has been with the company from the start). James and his team is always responsive to any support I need and did an excellent job in re-designing and re-building our marketplace website. This was a very complex job with separate shops/payments/blog/categories and everything was custom coded and designed for our website. It was great to be part of the re-design process and working with James and his team has been a truly positive experience. Code23 has also provided our hosting and on-going support, back ups, online security and maintenance. Definitely recommended to anyone who is thinking of having their website designed by professional team - you'll be in a good hands!

Magdalena Marsden Google review

We couldn’t be happier with the service from Code23. They were a pleasure to work with—friendly, professional, and really took the time to understand our needs. They met our brief perfectly, delivering a website that looks great and performs exactly as we envisioned, all at excellent value for money. What sets Code23 apart is their aftercare. Knowing they are on hand to monitor and maintain our website means we never have to worry about its performance. Their ongoing support gives us complete peace of mind, and we’d highly recommend them to anyone looking for a reliable and skilled web development team

Dan Isterling Google review

It has truly been a fantastic experience working with the Code23 team. Every part of the process from the scoping and onboarding down to the design and implementation of our website was handled excellently. The quality of service delivered by the team is globally top standard and I couldn't be more satisfied with the final outcome.

Samuel Elili Google review

Having turned to Code23 after a bad experience with another web designer, I can confidently say that the service James, Joe and their team provided is exceptional. They are incredibly receptive, professional and patient. They listened to my "vision" and together with their knowledge and experience delivered an e-commerce website which is perfect, even better than I though it could ever be. Throughout the process, James and Joe were always on hand and easy to communicate with and would send regular updates. I am particularly appreciative of the time, care and dedication they put into this project. Many thanks for making me the website of my dreams!

Eve Moira Google review

blogs

Latest from our blog

Notes from the studio on marketplaces, SaaS and building with AI.

View all posts
About Code23

Twenty years in. Zero passengers.

Building since 2005, rebuilt for the agentic era. You work directly with the people shaping and shipping your product - no account managers, no handoffs, and an agent layer that makes a small senior team feel like a big one.

Meet Code23
Est. 2005 Reading, UK Hands-on senior team
The Code23 team working together in the Reading studio
Fig. 01 - The team, Reading studio 51.4551°N / 0.9787°W
James, founder of Code23
Fig. 02 - James, founder EST. 2005
A product review session at Code23
Fig. 03 - Product review WK 34 / 2026
faq

Frequently Asked Questions

What does AI-native mean at Code23?

We use AI through the whole delivery cycle - strategy, design, engineering and QA - and we build AI into the products themselves where it earns its place. People stay accountable for every decision and for everything that ships.

What kinds of products does Code23 build?

AI agents and automation, SaaS platforms, marketplaces, websites and mobile apps - from a first MVP through to systems that run whole businesses.

Can you improve an existing website, platform or product?

Yes. Much of our work starts with something already live: adding AI capability, rebuilding performance-critical parts, or extending a platform your team already relies on.

How does a project with Code23 start?

With a short conversation, then a mapping phase covering your users, goals, systems and constraints - so you have a clear blueprint, roadmap and price before build starts.

Do you provide support after launch?

Yes. Managed support, performance and security, SEO and conversion, and continuous development - or a clean handover to your internal team with the code, documentation and knowledge they need.

Where is Code23 based, and who will we work with?

We're based in Reading, UK. You work directly with the senior designers and engineers doing the work - no account-management layer.

What size projects does Code23 take on?

Most projects run from a focused MVP measured in weeks to multi-year platform partnerships. We're not the cheapest route - we're built for products that have to work in production.

get started

What are you trying to build?

If you've got a product idea, a marketplace opportunity or a workflow that should work better, let's talk it through.