How long does AI SaaS take?

A contained B2B slice can move in a few months. Multi-tenant billing and integrations take longer.

Do you handle Stripe and accounts?

Yes, where that is part of the product. We will not fake billing in a spreadsheet forever.

What if we only have an idea?

Start with an MVP or prototype. SaaS comes when you have a user who will pay.

We deploy to infrastructure you control. We do not lock you into a mystery stack.

150+ projects delivered for UK and international brands

AI SaaS Development in London

AI SaaS development for London founders and operators who need a product with users, permissions and billing — not a notebook wrapped in a login.

Chat on WhatsApp

AI SaaS development for London founders and operators who need a product with users, permissions and billing — not a notebook wrapped in a login.

Start Your AI Agent

AI SaaS with billing, users and a real workflow

AI SaaS built as a product, not a wrapper

Design Dev designs and ships AI SaaS for UK teams who need accounts, roles, usage and a workflow that survives more than a demo tenant.The model is a feature. Billing, permissions and evaluation are the product.

Multi-user AI products

Roles, tenants and audit trails — not a shared chat history.

Billing that matches usage

Plans that map to the job, not mystery token invoices.

Workflows customers pay for

The AI does a job they already hate doing by hand.

Evaluation in production

Failed tasks, refusals and a way to improve without a rewrite.

A clear AI SaaS process from job to live product

Product job & ICP

Who pays, what job, and what “good” looks like in week one.

Architecture & tenancy

Accounts, data boundaries and where the model sits.

Build the core workflow

The paid job first. Settings screens wait.

Pilot with real tenants

A handful of users. We fix the product, not the pitch.

Launch, bill, improve

Go-live, usage review and a backlog that is commercial.

AI SaaS is a product problem, not a model problem

If you wrap an API in a login and call it SaaS, customers will churn the week the novelty dies. Design Dev builds AI SaaS as products: tenancy, workflow, billing and evaluation.

We will tell you if a service business or an MVP is the honest first step.

Tenant-aware AI products
Roles and audit trails
Billing mapped to the job
Evaluation in production
UK-English product UX
A commercial backlog

Start a project

Complete AI SaaS capabilities

Multi-user AI products with a paid workflow, tenancy and a path after the first tenants.

B2B AI SaaS

Tools operators pay for because they replace a painful job.

Vertical AI products

Workflows for a sector you already understand.

AI copilots as SaaS

Draft, review and export inside a product they log into.

Usage and plan design

Limits that match cost and value.

Admin and audit

Who did what, with which source, and when.

Pilot-to-scale path

What to harden before you sell to the next ten customers.

Ready to build AI SaaS that customers will keep paying for?

Speak with Design Dev about an AI SaaS product with a real workflow, tenancy and billing.

Start Your AI SaaS

WhatsApp Us

AI SaaS across key industries

Industry focus

Professional Services

Drafting and knowledge products firms will actually pay for.

Draft copilots
Knowledge SaaS
Matter intake
Audit trails

Discuss your project

Why Design Dev

A London AI SaaS team that treats the model as a feature

Design Dev builds AI SaaS for operators who have seen wrappers fail. Tenancy, workflow and billing are the job.If an MVP or a service is the honest first step, we will say so.

150+

Projects delivered

Years experience

UK+

London & worldwide

98%

Client retention

Start Your AI SaaS

A London AI SaaS team that treats the model as a feature

Strategy, design and engineering for brands that need a website that performs.

Product before prompt

The paid job is designed before the model is chosen.

Tenancy is not optional

Customers will not share a chat log and call it SaaS.

Cost is a product decision

Usage, plans and refusals are designed, not discovered in the invoice.

UK delivery

Commercial product thinking with a team that ships.

Technologies we work with

OpenAI

Python

Laravel

PHP

React

JavaScript

MySQL

HubSpot

Node.js

WordPress

Stripe

Figma

What clients say

Design Dev transformed our e-commerce platform. Their team was efficient, responsive, and delivered a stunning layout that doubled our conversion rate within a month.

Sarah Jenkins

Vauxhall Marketing - Shopify Development

An absolute pleasure to work with. They understood our brand identity perfectly and designed a clean, user-friendly SaaS platform that our clients love.