Killian Paulic, freelance developer in Rennes, France
You work directly with me. The price and the timeline are in writing before we start.
30-minute call, free and with no commitment.
“He showed great maturity, and was able to understand what was at stake for the product…”
Pick the situation closest to yours.
I have a product to launch
You have an idea, but nobody to build it. You don’t need a tank to find your first customers: you get a first version to test within a few days.
What’s included
I want to use AI in my business
Your teams spend time on tasks AI could do, and you don’t know where to start. I look at how they work and tell you where AI will save them time.
What it can look like
My AI-built app has hit a wall
You built your app with Lovable, Bolt, Cursor or Replit. It works in a demo, but you’re afraid to launch it, or it’s starting to break. I look at what’s wrong and make it reliable.
What’s included
My team needs a hand
Your technical team is in place, but you’re missing someone. I join the team a few days a week and work like everyone else, with your tools.
When to call me
I need a website
People looking for you should be able to find you, understand what you do and contact you. A site of a few pages is often enough, live within a few days.
What’s included
Products I’ve built, on my own or with others.
The French platform for amateur competition in the video game Valorant.
Nearly 1,000 members · Over 150 matches played · 26,000 visitors in the last 12 months
Live in5 weeks
A management tool for company leaders.
Then a year of support
A platform that checks a website works properly, using AI agents.
A tool that checks whether your products can be shipped to the United States, then prepares the documents with you.
The tool Valorant teams use to get organised and practise.
A tool to create your email signature.
An iPhone app to lose weight without overthinking it.
Taken over and made reliable in5 months
Software that manages medical assessments between insurers, medical experts and patients.
“Killian supported us in developing our MVP. He showed great maturity, and was able to understand what was at stake for the product and make it his own in order to develop efficiently. In addition, he demonstrated excellent communication skills, showing rigour and professionalism, which inspires confidence. He also managed to overcome development difficulties by finding relevant solutions with the means he was given. On top of that, Killian listens to feedback and quickly adapted to our way of working.”
“Killian is an excellent developer. He delivered what we asked for very quickly and accurately. Communication with him was always smooth and efficient. He listened to our needs and reacted very quickly when unexpected things came up, which made our collaboration very pleasant and productive.”
You tell me about your project and I tell you whether I can help or not.
In writing, with the scope, the timeline and the price.
We talk often during the project, and you tell me what works and what doesn’t.
At the end, the code and all the accounts belong to you.
I show my prices so you know what to expect before you call me.
These are guide prices, as of 31 October 2026. Every project is priced in writing before we start.
I can look after what comes next, for a business website or a product. Prices per month, excl. VAT.
Your site or product stays online.
Hosting included
I make sure everything keeps working.
Hosting and maintenance included
Time set aside to move the project forward.
I reply within 1 working day. Unused time doesn’t carry over, and outside services, like sending emails or AI, are at your expense. You can stop whenever you want: the code and the accounts stay yours.
My name is Killian Paulic. I’ve been a developer for 5 years and freelance since 2024, in Rennes, France.
Propell is me. I build your project myself and I work with AI every day. When you have a question, you call me directly.
Another question? Email me at killian@propell.studio
The guide prices are on this page. After our call, I send you a written proposal with the scope, the timeline and the price. You know what you’ll pay before we start.
No. I explain the technical choices in plain words and you test each new version yourself. Your job is to tell me whether it does what you expect.
Yes. Tell me what you can spend: we make the first version smaller, or I tell you what’s doable. A business website, for example, starts at €1,000 excl. VAT.
For a product, you can test a first version within a few days. A more complete product takes longer: Oramapp was live in 5 weeks. For an AI tool, expect a first prototype in 2 weeks. Your project’s timeline is written in the proposal.
You do. At the end of the project, the code and all the accounts belong to you. If you want to carry on with someone else, you can.
I can look after hosting, maintenance and improvements, with one of the three plans listed under Pricing. With Oramapp, I supported the team for a year after the first version. You can also take it all over yourself.
It can stay hosted in France. Before we start, I’ll explain where it will go.
The call lasts 30 minutes and it’s free. I’ll give you my opinion on your project, even if we don’t end up working together.