01
Never miss an enquiry
“Someone fills in my form at 9pm and hears nothing until Monday.”
A personal reply goes out straight away, the details are saved to one list, and you are told about it.
Connects to
Build with Mr J
Busywork, handled.
Repetitive tasks run on their own, so your day goes to the work that actually moves the business forward.
How it works
Describe it. See it built. Let it run.
01
Describe it
Say what is eating your week. A short call is all it takes to get started.
02
See it built
It is designed around how you already work, and shown to you before it goes live.
03
Let it run
It works quietly in the background, with support while you get used to it.
Connected
The tools you already use, working together.
Your existing tools get connected, so information moves on its own and nothing gets dropped.
Gmail
Forms
Sheets
Notion
Your assistant
Ask me anything↑
Calendar
WhatsApp
Instagram
Telegram
And the rest of your stack: email, forms, payments, social, booking, storage and more.
What gets built
Built around your day, not the other way round.
02
Answer the phone when you can't
“Calls come in while I am with a customer.”
A voice assistant answers common questions, takes a name and email, and offers a time to talk.
Connects to
03
Replies drafted, you approve
“Our inbox never gets to zero and every reply takes time.”
Each message is sorted, the urgent ones are flagged, and a first draft waits for your approval.
Connects to
04
Paperwork that fills itself in
“Invoices and forms come in as PDFs and someone retypes them.”
The details are pulled out of documents and sent to the right place, ready to check.
Connects to
05
Reports without the Sunday evening
“My numbers live in five places and the report takes hours.”
A clear summary lands in your inbox on schedule, with the questions you usually ask already answered.
Connects to
06
Ask your own files
“Nobody can find the right policy or contract when it matters.”
Your team asks in plain words and gets an answer from your own documents, kept private.
Connects to
07
Follow up so nobody goes cold
“People download my guide and I never speak to them again.”
New leads are sorted, followed up and added to your list, with proposals drafted when it is time.
Connects to
08
One idea, every channel
“I record one video and never get round to the posts.”
One recording becomes captions, short clips and a newsletter draft, ready for you to approve.
Connects to
09
Onboarding that runs itself
“Every new starter asks the same twenty questions.”
A helper walks new people through policies, training and IT questions, and flags anything unusual.
Connects to
10
Made to fit your business
“Nothing off the shelf matches how we actually work.”
A small custom tool, built around your steps and kept private if you need it, so nothing is forced.
Connects to
Plenty more where that came from.
See everything that can be taken off your plate, or describe your own on a free 15 minute call.
Built for
Built for the way you work.
Local shops
Stay helpful all day, even when the shop is busy.
Typical requests
- Do you have a table on Friday?
- Can I change my order?
- When do you open tomorrow?
Send a reminderUpdate my listConfirm the bookingTidy the spreadsheetFollow up with guestsSave every leadSend a reminderUpdate my listConfirm the bookingTidy the spreadsheetFollow up with guestsSave every lead
Save every leadFollow up with guestsTidy the spreadsheetConfirm the bookingUpdate my listSend a reminderSave every leadFollow up with guestsTidy the spreadsheetConfirm the bookingUpdate my listSend a reminder
What you get
Customers get an answer straight away, bookings land in your calendar, and anything unusual reaches you.
Outcomes
Real impact.
Real outcomes.
How teams turn busywork into time back.
5 → 1
Five separate tools became one system the whole sales team uses every day.
B2B sustainability client
24/7
Every call answered, patients verified and appointments booked, at any hour.
Healthcare client
40%
More efficient data processing across a global education network.
Education client
Automated
Patient intake and follow-up now run on their own, used daily by staff and patients.
Healthcare client
Meet Sylvia
Hi, I'm Sylvia.
I work with Mr J. Ask me what he builds, and I can set up a call with him.
Try asking
Sylvia is an AI assistant.
Learn
Want to build it yourself?
Everything needed to learn it and build it, shared in plain steps.
Trust
Built to be trusted.
Clear, careful, and always under your control.
Clear about AI
Assistants always say they are AI.
Only what is needed
Just the details the job requires.
You stay in control
Anything important gets your approval first.
Your data stays yours
Never sold, never used for ads.
About
I'm John. Most people call me Mr J.
I'm an AI Engineer & Software Developer in Germany, and I build the systems behind Build with Mr J.
I don't just write code. I design the intelligence layer: voice agents, automations, and data pipelines that hold up in production.
Every project starts the same way: understand the real bottleneck, then build the smallest system that removes it for good.
Ready to hand off the busywork?
Describe what is slowing you down. A free 15 minute call is all it takes to start.