Yesterday, building custom software cost €30,000 and took 6 months.

Today it costs €3,000 and takes 1 week

The quality hasn't changed, only the methods.

The penguin dances with a gift

I have a gift for you

To celebrate my launch, I'm giving away a one-day workshop to build your tool, worth €3,000, to the idea that moves me most. I'll pick my favourite project on November 20.

  1. Your idea
  2. Your details
  3. Sent

I am . I make . I'd love a tool to .

Youssef, founder of Growth with Flow

Hey, that's me

I'm a French software engineer. After my studies I left a consulting job at an investment bank and went freelance, with one mission: helping people with a project bring it to life their own way.

This is what I manage to build on my own

Well... With a little help from Claude :)

Built forOrpi

A tool that re-engages past clients on WhatsApp

3,000 past clients, a WhatsApp marketing campaign from the agency's own number, and an AI assistant that alerts the right agent.

  • Ten years of files merged into one database
  • The assistant replies and spots projects
  • Every project lands with the right agent
See the details

Built forMiharu

A tool that keeps watch on the market by itself

About 330 web searches, every link checked, under €1 per briefing, and a map of competitors.

  • Searches in parallel, then sorting
  • Every fact checked and sourced
  • Settings anyone can change, no developer needed
See the details

Built forAdefpat

A tool that fills in documents automatically

The right template, the values already filled, the file saved in the right place.

  • The funder's template, picked on its own
  • Values arrive from the team's own software
  • The file named and saved, no retyping
See the details

Built forMiharu

A tool that sends the right email at the right time

Seven emails instead of one sent with the quote, triggered by the stage in Zoho, with every manager staying in control.

  • The sequence set up in a few clicks
  • Emails written with the CRM's data
  • Every send can be personalised before it goes
See the details

Built forAdefpat

A tool that tracks what each agreement has used

Each agreement, its budget, what is already spent and what is planned: overruns show up before the payment request.

  • Time, expenses and sessions added up
  • Line by line, to date or with what is planned
  • Overruns spotted right away
See the details

Built forMiharu

A tool that brings several venues' calendars together

Eight venues, dozens of rooms, one view: everyone sees at once what is free.

  • Every room of every venue, at a glance
  • On hold or confirmed: each slot says so
  • The quote's details land on the slot
See the details

Built forAdefpat

A tool that gathers the month's timesheets

Each employee's hours and expenses, compared with the hours expected: you know who to chase before paying.

  • The whole team's month on one page
  • Incomplete days and receipts to fix
  • To check, to chase, approved, paid
See the details

My own way of doing things

We co-build your tool, together. You come to a workshop, and you take part in every step of its design.

Over video

A call to scope it.

You tell me about your project, we set the scope, and we pick the workshop format that suits you.

In person

A workshop.

One or more days together. I advise you on your work and your processes, then we build your tool: you take part in every decision.

A week later

An iteration.

You've used the tool for a week. We fix what bothers you, and I deliver the final version.

Then, if you want

The follow-up.

A question, a bug, a new idea? I'm still here to grow your tool with you.

My prices

Everything you need to know to understand what it will cost you. That way, no nasty surprises.

The sessions

We build your tool together, side by side.

A simple tool

€3,000all included
  • A call beforehand, to agree on the plan
  • One day of workshop together
  • Delivered in one week, from the workshop to the final version online
  • Then one iteration to fine-tune it
  • The code is yours
  • Hosting, from €20 / month
  • Follow-up, from €100 / month

Hosting

I put it online, in France, and keep an eye on it.

Light usage

€20 / monthper app
  • Hosted in France
  • Storage: 2 GB
  • Visits: 30,000 a month
  • Power: 0.5 vCPU
  • Backups, updates, monitoring

Follow-up

I look after it over time.

I keep watch

€100 / monthper app
  • I fix it when it breaks
  • I answer your questions within 2 working days
  • Up to 3 small changes a month
  • One day of development a month
  • One hour of advice a month

You can save money and time.

A custom tool is a huge competitive advantage, and it used to be reserved for the giants. I'm making it available to anyone with a project!

Two kind messages from happy clients

Careful, I'm going to blush.

“Nobody had taken the time, or had the curiosity, to really understand what was blocking us.”

“I get so much praise for that website. It's so different, exactly like my school.”

Frequently asked questions

Ever wondered why almost every website has an FAQ? It helps Google find them: the more questions and keywords, the higher the site ranks in searches. This one is no exception. If you have a real question, the easiest way is still to ask me directly 🙂

€3,000 for a simple tool and €7,500 for a complex one, all included. An agency would typically charge €30,000 and six months for the same result. The price covers the scoping call, the workshop, development, going live and one iteration. It can be spread over 12 months, with hosting and maintenance included for a year. The five-day retreat is quoted on request.

One week for a simple tool, three weeks for a complex one, from the workshop to the final version online. One iteration follows, to fine-tune the tool once you've used it.

Business tools for small companies: customer follow-ups by email or WhatsApp, document generation, room planning, market monitoring, CRMs, dashboards, invoicing. In short, anything that replaces a makeshift spreadsheet or a task done by hand over and over. Every example on this page is used by real clients.

First a video call to scope the project and pick the format. Then one or more days together, in person in Toulouse: I advise you on your work and your processes, and we build the tool together. I finish it, put it online, and we run one iteration.

Because it's faster and more accurate. You're there while I build: you watch the tool take shape, and we fix what's wrong straight away instead of finding out months later.

No. You know your business, I know the tech. During the workshop I ask the right questions and advise you, so we build the right tool.

Off-the-shelf software is fine if the way you work is standard. Custom pays off when you stack subscriptions that don't talk to each other, or work around your tools with spreadsheets. You pay once, the code is yours, and the tool follows your processes exactly.

Yes, with Claude Code, Anthropic's coding assistant. That's what makes it possible to deliver in a week what used to take months. I review and master all the code: AI speeds up the work, it doesn't make the decisions.

You could try: anyone can use Claude Code. But handing an AI work you can't judge yourself is risky: you won't spot its mistakes. That's exactly where I come in.

You do. On delivery if you pay upfront, at the end of the 12 months if you spread the cost.

Your call. I install it for free on your own server, or I host it for you: €20 or €40 a month depending on usage, or €40 a month plus the server price if you want your own. Everything is hosted in France, with backups, updates and monitoring included.

I'm still here. A follow-up plan from €100 to €1,200 a month per tool, or on demand with no subscription: €200 for a two-hour fix, €800 for a day of changes, on quote, billed by the half-day, €300 for a one-hour consulting session with a written report and recommendations.

Workshops take place in Toulouse, at The Social Hub, with access, coffee and lunch included. You can come from anywhere: the scoping call and the follow-up happen remotely, only the workshop needs you on site.

Yes. In France, receiving electronic invoices has been mandatory since September 2026, and issuing them will be for every company in 2027. You may as well own your tool rather than pay for one more subscription.

Me, Youssef, an EPITA engineer and freelance developer based in Toulouse. I build custom tools for small businesses and project owners, and I'm your only point of contact, from the first call to the follow-up.

We should talk!

If you've made it this far, it might be worth carrying on with an actual call?

Grab a virtual coffee with me ☕