Custom AI operating systems

Right now, yourbusiness runson you.

I build the system that takes the routine work off you and your team, starting with the quote drafted the moment an enquiry lands. It runs on the tools you already pay for, and you own all of it.

The problem

You’ve already spent money on AI and the business runs exactly as it did before.

A subscription somebody recommended. A tool that demoed beautifully and now lives in a tab nobody opens. Maybe an agency that took three months and handed back a chatbot answering questions your customers were never asking.

What nags is the suspicion that a competitor has worked something out that you haven’t, and no way to tell a real capability from a good demo.

What it costs you while nothing changes

01

The business moves at your speed

Take a week off and the business takes the week off with you, then hands you the backlog on the Monday.

02

You pay senior rates for data entry

The people you hired for judgement spend their day retyping, chasing and updating.

03

Growing costs more every time

Headcount is the only lever left, so more work means more people and more of the same admin.

Every one of those things you bought was a tool, and a tool sits there until a person opens it and types. That person is still you.

The better way

The difference between a tool and a system.

A tool waits for you. A system already knows how your business runs, has permission to act, and gets on with it before anyone asks.

Today
Email
WhatsApp
Spreadsheets
Client list
Xero
Your team
You
every task, every day

Everything routes through you.

With an operating system
You
decisions only
Your team
the real work
Your Operating
System
Email
Client list
Xero
Projects

Work flows through the system. You get decisions, not tasks.

What that looks like in an ordinary week

01

An enquiry lands at 21:40.

The quote is drafted off your own rates and last year’s similar jobs, sitting in your drafts before you’ve read the email. You change two numbers and send it.

02

An invoice goes fourteen days past due.

The chase goes out in your wording, then again a week later. You hear about it when the money lands.

03

It’s Monday, 06:00.

The report is written: what came in, what went out, which client has gone quiet, off live numbers rather than somebody’s memory of last week.

It runs on the tools you already pay for, inside your own accounts, with permissions per person and a record of every action it took.

Once you can see how it’s put together, you can point it at anything. That’s the part worth owning.

How I build it

Eight weeks, built live, inside your own accounts.

I don’t disappear for two months and come back with a finished box. Each piece starts working the day it lands, so you can tell early whether this is worth carrying on with.

A real example, start to finish
New client signs: Anika
Project opened, team assigned
Welcome pack sent
Kickoff call booked
Deposit invoice drafted in Xero
The one message you get

“Anika is live. Kickoff Thursday 09:00. Invoice ready for your sign-off.”

Yours might be a VAT deadline, a placement, or a patient booking.

Four things that are true of every build.

You own it outright

No licence, no platform fee, nothing that switches off if we stop working together. It lives in your accounts from the first day, so it is yours before it is finished.

Anything leaving the business waits for a yes

Money and messages to clients need a person to approve them, and you choose where that line sits.

Each person sees only what they should

Permissions per role, and a record of every action the system took and when.

Your team keeps working where they work

Most systems die because the team has to bend around them. This one goes in on the tools they already open.

Systems I've built

Real businesses, running on systems I built them.

In every one of these, the routine work moved off the founder and onto the system.

E-commerce health brand

A supplement brand where the founder was the bottleneck between orders, ads, suppliers and customers. Now one system runs the trading floor.

1,378
orders fulfilled through it
What it runs
  • Orders from placed to packed to shipped, on one board
  • A live revenue and product analytics view
  • Meta ad spend and results synced in
  • An AI assistant that drafts creative and answers questions on the numbers

These are screenshots of live client systems. Client names, personal details and financial figures have been redacted to protect confidentiality.

The pieces that show up in almost every build.

Open any one for the before, the fix, and the result.

Cristo Van Rensburg, founder of Cornerstone AI
Meet the founder

I started my first business at 16, selling firewood to neighbours.

Since then I've built systems across hospitality, construction, real estate, insurance, fintech and franchise operations.

Different industries, same bottleneck: the founder had become the operating system of their own business. The fix was always the same, a system built around how they actually work.

The name comes from my faith. Christ is the cornerstone of the church, and that's the foundation this company is built on. People come first. I don't build tech that looks impressive on a slide deck, I build systems that make a difference to the humans using them every day.

Whatever I build, you own outright. No lock-in, no licence, no dependency on me.

What it costs

$6,000 buys eight weeks of my time, pointed at your business.

There’s no fixed feature list. You decide what gets built as we go, and by the end your business is running on one system instead of five half-updated tools and a group chat.

The Build

$6,000

Eight weeks, paid up front

Then four more weeks of support on me, so you use it with me still around.

I take on three new businesses a month.

That’s what makes the turnaround times above worth anything.

What you get

  • A working session in week one, with you and the people who actually do the job
  • Two training sessions for your team
  • Everything built inside your own accounts from the first day

How fast things happen

24hours

To answer anything you send, and to fix anything already built.

7days

From starting a new build to it running in your business. That's the ceiling, not the average.

5open requests

You can have five things in the queue. I work them one at a time, so nothing sits half finished.

There’s no standing weekly call. We talk when something needs talking about, and the rest goes through the channel. You’re short of time already, and a meeting in your diary every week isn’t the thing that gets your business built.

After the twelve weeks the system is yours and it carries on either way. If you want me to stay on, it’s $2,000 per four week cycle to keep building or $500 to keep what you have running. Nothing renews on its own.

Straight answers.

How much of my time does this actually take?

A working session in week one, then very little. You get a direct line to me rather than a place in my calendar, and we talk when something needs talking about.

If the scope isn’t fixed, what stops it drifting?

The queue does. You decide what matters most that week and it gets built, and what stops it sprawling is that I only work one thing at a time. You are buying eight weeks of building toward one system your business runs on, not a shopping list of features.

Which tools does it work with?

The ones you already use. I map your exact stack in week one and tell you straight away if something can’t connect, before anything gets built on the assumption that it can.

My team isn’t technical. Will they use it?

They get trained on each piece as it lands rather than sitting through one long session at the end, so by week eight they’re using it rather than learning it.

We handle sensitive information. Patients, legal files, payroll.

That changes how I build, not whether I can. Sensitive information gets tighter access, human sign-off on anything that touches it, and I build to your industry’s rules. Bring the specifics to the call.

Book a call.

Thirty minutes, with me. Bring the part of your week that irritates you most and I’ll tell you what I’d build first and what it’s worth doing. If it isn’t worth doing, you’ll hear that on the call rather than after the invoice.

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