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Freelance developer for startups

Web development for startups and scale-ups

I design and build websites for startups and scale-ups in Belgium, from the first serious site to a multi-market architecture.

5.0
15 years of experience
The problem

You buy your traction instead of manufacturing it

And every euro of acquisition comes out of the same runway as your salaries.

Your website tells your product story. So does everyone else's.

Same promise, same screenshots, same row of client logos. The decision-maker evaluating three solutions in parallel finds nothing to separate you, so they compare what compares: price.

You raised, hired and shipped. Your website stayed on day one.

The team tripled, the product has moved on, the customers got serious. The page still dates from the first version. Your prospects, your candidates and your investors all read the same expired shop window.

Zero inbound, and no idea who came by.

The pipeline rests entirely on outbound and campaigns. The visitors who do turn up leave without a trace, and nobody on the team can say how many they were or what they were after.

Your acquisition cost climbs every quarter.

The bigger you get, the more budget it takes to hold the same pace. You rent your growth by the month. The day campaigns stop, the curve stops with them, and the board sees it before you do.

The solution

A website that manufactures traction instead of buying it.

It keeps working the month you switch the acquisition budget off.

With this new website, your growth stops depending on this month's budget.

Your prospects, your candidates and your investors read the same story, the one of the company you have become.

What sets you apart is what you refuse to do.

One customer profile named, one problem solved properly, and everything else owned as out of scope. A sharp position sends away the visitors who would never have signed, and convinces the rest before the first call.

Three audiences read your site. It has to hold up for all three.

A prospect looks for proof, a candidate for a team and a project, an investor for signs of seriousness. The same pages can serve all three if they show your customers, your results and the people building the product. Your site catches up with the level the company is really at.

Without measurement, you don't know which page to work on.

Journeys tracked, forms that qualify instead of collecting an email, enquiries landing in your CRM with their source and a notification to the team. You know where your best deals come from, and where to put the energy next.

Every page you publish stays in the pipeline.

Pages that answer what your prospects search on Google and ask AI assistants, and that compound instead of being consumed. The architecture absorbs a pivot, a new offer or a new market without starting over.

What my clients say

SME owners with the same need as you: a site that matches what they sell.

Sébastien is always attentive and understood our needs perfectly when it came to redesigning our website! The new site looks great and was delivered on time. We've already gained a few customers thanks to the improved SEO of the new site
Didier Boulvin

Didier Boulvin

Coddy

Numinam's contribution to the development of our App has been significant in its success with our B2C and B2B customers.
Stephane Draux

Stephane Draux

Founder • Spengo

Numinam (One More Pixel) is doing a fantastic job for Euronet. They’ve started the mission in saving our web-site from a cyber-attack. We had lost a lot of information and they had to rebuild our web-site. They had to recover the data left on our…
Valérie Van Belle.

Valérie Van Belle.

Managing director • Euronet

At Nallian we build solutions that are trusted by the world's leading airports, ground handlers and logistics companies. But our website no longer reflected that level of excellence. This redesign ensures our first impression matches the quality of…
Jean Verheyen

Jean Verheyen

CEO • Nallian

The new website much better reflects who we are. It tells our story more clearly, it's easy to navigate, it looks fresh and modern. It is more Nallian.
Joke Aerts

Joke Aerts

Director of Marketing • Nallian

Numinam's technical and design vision has enabled us to improve our lead generation flows. A big step forward.
Jérôme Van De Sande

Jérôme Van De Sande

Product & Data Leader • Heat Me

Numinam has completely modernized our website. The design is clearer, more credible, and our visitors understand what we do. A real leap in quality. Also worth noting is the excellent collaboration between Numinam and our development agency. Thank…
Olivier Lafosse

Olivier Lafosse

Founder & CEO • 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

Shirley Boterdael

Marketing & Com. Manager • Highcodata

Over 15 years of experience, put to work for your growth

You don't talk to a salesperson who reports to a project manager, who briefs a developer and a designer: all those people sit in front of you, in one person, from the very first meeting.

01 UX / UI design

from €595

Before a single line of code, we clarify your positioning and your visitors' journey. The design then does the work of establishing the credibility your team has already earned.

What's included

  • Research and scoping
  • Mockups and clickable prototype
  • Conversion-focused copywriting
  • Design system

What you get

  • Approved mockups
  • Navigable prototype
  • Visual guidelines

02 Lightning-fast website build

from €1,190

I build your site from scratch: it loads in under a second and turns visitors into qualified enquiries. Architecture ready for multiple languages and new markets, and code that is 100% yours.

What's included

  • Astro development
  • Loads in under a second
  • Google PageSpeed score of 95+
  • Multilingual, scalable architecture

What you get

  • Site live
  • Code, domain and access (100% ownership)
  • Hands-on training

03 SEO / AEO / GEO

from €595

Your prospects search on Google and ask ChatGPT what solutions exist. I structure your site so it shows up in both places, and I send you the ranking report so you can watch it move.

What's included

  • Technical SEO
  • Structured data
  • Silo architecture
  • Rank tracking

What you get

  • Indexed, structured site
  • Ranking report
  • Content recommendations

04 Automation

from €595

Lead qualification, follow-ups, reporting, alerts in your team tools: I automate what weighs on a team that is still small, with or without AI. Measurable results within 4 to 6 weeks.

What's included

  • Process audit
  • n8n workflows
  • AI integrations
  • Connecting your CRM and analytics

What you get

  • Workflows in production
  • Documentation
  • Hours won back every week

05 Follow-up and support

I don't hand over a project and vanish. Updates, optimisations, A/B testing and dashboards: I stay your partner for the long run.

What's included

  • Maintenance and updates
  • A/B testing
  • KPI dashboards
  • Ongoing optimisation

What you get

  • Regular reports
  • Measured improvements
  • A single point of contact

How we'll work together

At each step, you know what I do, what you approve and how long it takes.
100%
  1. 01 Scoping call and project setup

    We go over your goals, sort out the paperwork, and I show you the tools we'll be using together.
    5%
  2. 02 Mockups and validation

    I show you a custom mockup for you to pick apart before a single line of code is written.
    15%
  3. 03 Development

    I build your site: fast, and faithful to the design we approved. You get a live preview throughout.
    55%
  4. 04 SEO / AEO / GEO optimisation

    The site is ready, but it needs analysis and serious fine-tuning to prepare its arrival on the web.
    15%
  5. 05 Launch and training

    Go-live, tracking configured, your team trained on the back office.
    5%
  6. 06 Follow-up and optimisation

    3 months of support included, free of charge. Nobody does that.
    5%
Let's look at what acquisition is costing you.

Let's look at what acquisition is costing you.

25 minutes to look at your situation together: what acquisition costs you today, where your website loses visitors, what it says to a prospect or an investor. You leave with a clear diagnosis, even if we never work together.

It's free, there's no commitment, and you get me directly on the phone. The developer you talk to is the one who will build your site.

Book my free 25-minute call

Frequently asked questions

How much does a startup website cost at Numinam?

The budget depends on your stage of maturity and on your goals. I charge €595 per working day. A validation landing page starts from 2 days, so from €1,190. A complete showcase website with an SEO blog: 6 days, so from €2,975. If your team has to manage content on its own, a website with CMS starts at 12 days, so €8,925. The free 25-minute audit scopes the right format for your project.

How fast can a startup website be delivered?

Between 1 and 10 weeks depending on scope. Validation landing page: 1 week. Showcase website up to 10 pages: 1 to 2 weeks. Website with CMS and advanced SEO/GEO: 8 to 10 weeks. I commit to a precise timeline from day one: no deadlines that slip without explanation.

Why choose a freelance developer over an agency for my startup?

With an independent developer, you work directly with the person who designs and codes your site. No project manager in between, no agency margin, and a single point of contact who knows the project end to end. In practice, a decision gets made during the call instead of waiting for the next team meeting.

Will my startup website be visible on Google and in AI answers?

Yes. Technical SEO is baked in from day one: sub-1-second load times, structured markup, sitemap, optimised Core Web Vitals. I also integrate GEO (Generative Engine Optimization) so your site gets cited in Google AI Overviews, ChatGPT and Perplexity responses. 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 stuck?

No. A continuity procedure is in place: developers I trust have secure access to the source code and the production environments, and they contact each client in the event of extended unavailability. Beyond that, you own the source code from delivery, it lives in your own Git repository, it uses widely adopted frameworks and it ships with technical documentation.

What I cannot promise is being available forever; what I can guarantee is that my leaving does not block you.

Can my website evolve as my startup grows?

That's built in from the start. The architecture is designed to evolve: add pages, integrate a blog, go multilingual, connect a CRM or analytics tool. If you reach the stage where your team needs content independence, migrating to a custom website with CMS is seamless: I already know your project.

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