I'm Thomas Gysemans, a freelance developer and designer with a passion for astronomy. Showcase website, mobile app or software: I design it and build it myself, with no agency or subcontractor.
Why me
I plan for speed and accessibility from the very first mockup. This site is built the same way, and its Google scores are a little further down.
No bought theme, no page builder. Your project is designed around your brand and your customers, and you approve every screen before the first line of code.
I often deliver a tailor-made admin interface: texts, photos or new work, you publish them from your browser, without touching the code.
Only the code that is needed gets sent, when it is needed. The 3D planets on this site, for instance, load only once the page is displayed, and each one only as it nears the screen.
Each layout is designed for the screen that shows it: on a phone, nothing is simply shrunk.
No tracker without your visitors' consent. Your site works entirely with a keyboard, and its contrasts are checked.
Its Lighthouse tool scores every page on four criteria: speed, accessibility, best practices and search visibility.
There are billions of websites. Yours has to shine bright enough to be noticed.
Work
For clients or for myself: each page gives the project's context and the technologies used.
See all 23 projects
A modern, secure manager for storing passwords, payment cards, environment secrets, and confidential notes on one or more devices, with optional synchronization via Google Drive.
A science outreach platform for sharing astronomy with everyone, my first big project.
This project replaces the "Access" software that has been used since 2003 at a company named "Gestion Technique Informatisée" (GTI).
Their feedback, which I summed up in one sentence.
Efficient, thorough work, with great attention to detail.
Owner, GTITranslated from French
Delivered on time, exactly as promised.
Owner, YSA - roofing & renovationTranslated from French
Clear communication, start to finish.
Owner, Food'Halluin - restaurants platformTranslated from French
Behind the screen
I have been coding since I was 13, self-taught at first, then at the IUT A in Villeneuve-d'Ascq, where I earned my BUT, a three-year Bachelor of Technology. I did internships at Kimple and Tabuléo and a year-long apprenticeship on Quizéo, then came my first freelance clients, through word of mouth.
Astronomy is my other passion, and it often finds its way into my code. With Space Visitor and ScienceSky, I learned to keep 3D smooth and to explain hard topics simply.
You deal with one person, me, and you see your project at every stage, before it costs a line of code.
I design every screen. You approve them one by one, and nothing gets coded without your go-ahead.
You click through your future site or app before it is even built.
I code and I test. Every line is reviewed, and automated tests run on every delivery.
Your project goes live on schedule. You receive the source code and all the keys.
A bug within a year of delivery? I fix it for free, no questions asked.
Comparison
What you get with me, compared with the other usual ways to build a site or an app.
| Criterion | With me | Traditional agency | Website builder |
|---|---|---|---|
| Design | |||
| Mockups designed for you | Included | Depends on the provider | Rarely |
| Clickable prototype before coding | Included | Often an extra | Rarely |
| Code | |||
| Accessibility compliant | Included | Rarely | Depends on the provider |
| GDPR compliant | Included | Depends on the provider | Rarely |
| No tracker by default | Included | Depends on the provider | Rarely |
| SEO best practices | Included | Depends on the provider | Rarely |
| Core Web Vitals support | Included | Depends on the provider | Rarely |
| Source code handed over | Included | Depends on the provider | Rarely |
| Launch and follow-up | |||
| Going live | Included | Often an extra | Included |
| One-year bug guarantee | Included | Often an extra | Rarely |
| One single contact | Included | Rarely | Rarely |
| Fixed price, no subscription | Included | Depends on the provider | Rarely |
General comparison: every agency and every tool is different.
Pricing
The showcase website has a starting price. For an app or software, I price your project after a first conversation.
Show your business and let customers reach you.
from
€500
For craftspeople, shops and independents.
Your app, on the App Store and Google Play.
price
On quote
For businesses and project founders.
A tool built around the way you work.
price
On quote
For teams that want to save time.
The quote is free and with no commitment. Once signed, the price does not change.
Secure payment available through Malt.
Yes, and desktop apps too. Prism Security Manager, for example, runs on Android, iOS, macOS, Windows and Linux from a single codebase. I also handle publishing on the app stores.
Yes, for the browser as well as the desktop. For GTI, I replaced a 2003 Microsoft Access program with an internal web app, without upsetting the teams' habits.
It already is for public services. Since 28 June 2025, the European Accessibility Act extends it to many private services, such as online shops or banking. Service microenterprises are exempt, but an accessible site is still a site more people can use.
By default, I install no advertising tracker. If you want to measure your audience, I use a tool exempt from consent, or place it behind your visitors' agreement. As a result, there is often no cookie banner at all.
It depends on the scope. We set the deadline together in the quote, before starting, and it is met: that is the first thing my clients mention.
No. A rough idea is enough for a first conversation, we refine it together. That is exactly what the mockups are for: seeing the project before building it.
You do. On delivery, you receive the source code and every access: domain name, hosting, app store accounts. You are tied to no one.
For a year, any bug is fixed for free, no questions asked. For new features, we start again from a quote, as at the beginning.
Yes, as a tool: it helps me deliver faster and catch edge cases early. Every line is still reviewed by me, and automated tests run on every delivery.
Yes. On Malt, payment is secured and the assignment is covered from start to finish.
Reply within 48 hours
A few lines are enough. You get a free quote, with no commitment.
Prefer to write directly?thomas@gysemans.dev
