Your website is about as fast as an asthmatic goat.
Google and LLMs favor fast, high-performing websites.
I help you go from startup to scale-up
I'm a startup founder myself, with 15 years of experience. I build websites and apps for startups and scale-ups as if they were my own.
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Website design and build
I build your website as if it were mine.
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Web app development
I help you improve the product.
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Mobile app development
Hybrid technology to keep costs down.
Some signs never lie when you need a new website.
“I have no idea what you actually do.”
That's what your prospect told you. Only the bravest ones read the FAQ.
Your website still shows the MVP.
Meanwhile, the product has moved far beyond it.
Your sales team is ready with the demo.
But your website can't keep up with their ambitions.
Outbound and paid ads are expensive.
Lead generation is stalling, and your website doesn't convert the leads you get.
Give me 25 minutes and I'll tell you what's wrong with your current website. For free.
Check my availabilityI've helped these clients solve the same kind of problem
Here's what we'll do together
We'll build a strategy, dig into the data, design the screens, develop great pages and see how they perform.
4 to 16 weeks €4,760 to €17,850 excl. VAT
Let's pick a date 
First, a solid strategy
Building a website because you like how it looks is nice, but it's throwing your money away. Instead, we work out a coherent strategy based on your goals.
Then we test and iterate
As my mother used to say, I don't know everything. So we try POCs until we find what clicks.
Once we've found it, we scale what works
It's the most effective method and the one I always recommend: we move step by step, one iteration at a time. Even if it takes a little longer, the results are better.
Products that are visible, credible and ready to grow.
coddygames.com
Coddy · Urban games platform
250,000 players in 9 countries.
Acquisition, sales and operations brought together in one platform.
- players
- 250,000
- countries
- 9
- organic traffic
- 60%
- of bookings automated
- 90%
nallian.com
- 61 → 95 Lighthouse
- < 1 s load time
- 100% editorial autonomy
Nallian · B2B SaaS
A website that follows the sales cycle.
A custom editorial platform, built around an international sales cycle.
See the Nallian case Squadra
< 2 min from request to quote
Squadra · Marketplace
An instant quote, with no back-and-forth.
The client describes what they need, the platform matches them with the right provider and generates the quote.
See the Squadra caseI like to work in phases
Here's how a typical project with Numinam goes.
Today Milestone 1
Discovery call
We go over your goals and get to know each other. I give you a few pointers to fix the most urgent problems and send you a proposal for the trickier ones.
Within the week Milestone 2
Kickoff meeting
I gather all the useful data you have (your personas, SEO figures, product descriptions) and retreat to my cave to define the strategy. A few days later, we validate it together.
Within 10 days Milestone 3
Figma design
We move into a design phase, usually in Figma or Penpot. We review it together, make the changes and have it tested internally.
In 2 to 3 weeks Milestone 4
We build
Everything I do is visible: if you're interested and geeky enough, I give you access to GitHub and you follow the progress. We hold one or two video check-ins a week to keep the project on track.
Depending on feedback Milestone 5
We test the new website
We ask internal and external reviewers, such as clients or partners who know the industry, to go through the delivered website. If it's good, we launch. If not, back to development.
My clients vouch for the method.
Numinam's technical and design vision has enabled us to improve our lead generation flows. A big step forward.
Jérôme Van De Sande
Product & Data Leader · Heat Me
It was a real pleasure to do business with Sebastien. He did a great job and transform our inefficient and boring website to a nice one that generate leads. Moreover, Sebastien is a patient and reliable partner and he's always ready to help.
Shirley Boterdael
Marketing & Com. Manager · Highcodata
Price guide for a startup website redesign
It depends on the scope, but projects usually end up around these prices.
Sales website
€4,760
8 days · 2 to 4 weeks
To replace a website that is too thin with a complete sales pitch.
Positioning and user journeys
Up to 10 pages
Technical SEO and tracking
Growth website
€9,520
16 days · 6 to 10 weeks
To publish, test and grow your acquisition without relying on an agency.
CMS and dynamic content
SEO and AI visibility
CRM, forms and analytics
Most popular
Scale-up website
€17,850
30 days · 10 to 16 weeks
For several markets, languages, offers or editorial teams.
Multi-market architecture
Editorial roles and workflows
Custom integrations
All prices exclude VAT. You own the code, the domain and the accounts.
Founders often ask me these questions on discovery calls.
If you have a new one to add to the list, I'm all ears :)
How much does a website cost for a startup at Numinam?
The budget depends on your stage of maturity and your goals. I charge €595 per working day. A validation landing page starts from 4 days, i.e. from €2,380. A complete business website with SEO blog: 8 days, or from €4,760. If your team needs to manage content independently, a site with CMS starts at 16 days, or €9,520. The free 25-minute audit allows you to define the formula suited to your project.
How quickly does Numinam deliver a startup site?
Between 1 and 10 weeks depending on the scope. Landing page validation: 1 week. business website up to 10 pages: 1 to 2 weeks. Site with CMS and advanced SEO/GEO: 8 to 10 weeks. I commit to a precise schedule from the start: no deadline slips without explanation.
Why choose Numinam rather than an agency for my startup?
With an independent developer, you work directly with the person who designs and codes your site. No intermediate project manager, no agency margin, and a single contact who knows the project from start to finish. A decision is made during the call instead of waiting for the next team update.
Can Numinam make my site visible on Google and in AI responses?
Yes. Technical SEO is integrated from the design: fast loading, structured markup, sitemap and Core Web Vitals monitored. I also integrate GEO (Generative Engine Optimization) so that your site is cited in answers from Google AI Overviews, ChatGPT and Perplexity. Being visible on Google is no longer enough: you also need to be cited by AI.
What happens if Sébastien is no longer available? Is my site blocked?
No. A continuity procedure is in place: trusted developers have secure access to source code and production environments, and contact each customer in the event of prolonged unavailability. Furthermore, the code belongs to you upon delivery, it lives in your own Git repository, it uses popular frameworks and it is documented.
I cannot promise eternal availability. On the other hand, my departure will not block you.
Can Numinam develop my site with my startup?
It was planned from the start. The architecture is designed to evolve: add pages, integrate a blog, switch to multi-language, connect a CRM or an analytics tool. If you reach the stage where your team needs to manage content independently, the migration to a custom site with CMS is seamless: I already know your project.
How does Numinam protect the data of my startup and my prospects?
Numinam limits the data collected to what is strictly necessary, documents the connections between the site, your CRM and your analysis tools, and favors hosts and subcontractors adapted to your European constraints. Access is nominative and revocable, secrets are not stored in the code, and you remain owner of the domain, the repository and the accounts used. The precise choices are validated during scoping according to the sensitivity of your data and the requirements of your legal team.
Yes, you're right. It's finally time to move on the website.
You have nothing to lose by getting in touch. At worst, 25 minutes of your time if I'm no good. At best, you leave with free advice.
Let's talk it through online