A rock-solid site that loads fast
Straffe Sites is a senior web team in Belgium building fast websites and AI. Seppe is your main contact. Our case sites scored a median 98/100 on mobile PageSpeed in September 2026.
4.9/5 on Google26 reviewsWe build with Astro — the Core Web Vitals leader in the latest HTTP Archive comparison
In July 2026, 69% of measured mobile Astro sites had good Core Web Vitals, compared with 49% for WordPress and 33% for Next.js. View the source data.
One team, everything for your site
From the first line of code to maintenance: one point of contact for everything your website needs.
Web development
Fast websites and online stores, designed and built by a small senior team.
Custom features & integrations
Custom features, from smart forms to connections with your tools.
Website maintenance
Updates, monitoring and speed: your site stays secure, current and fast.
Technical partner
A dedicated point of contact who helps shape your digital plans, even after launch.
AI design to website
We turn your AI design into a fast website that is easy to maintain.
Work with real personality
Digital experiences that feel like the company behind them.
Verhuurwinkel.nl
A rental store with twice the daily Google clicks it had at launch
Straffe Sites
Our own site as a running case: measured monthly, reported honestly
Voltti.ai
A premium site for practical AI agents under human control
Gitaarlessen Boeckx
Guitar lessons in Antwerp: page one for teacher Ben Boeckx
2140 Boxing Training
A boxing site with punch for personal trainer Brian, on a small budget
Figur
Beautiful and findable on a budget: Astro and custom bookings
New Impact
A cinematic site for professional content creation and video production
Roulez Roulez
A light portfolio site where prospects find the right video type
sympl
A sharp SaaS site that explains social recruitment and leads to a demo
ZET
A clear site for heat pumps and air conditioning, DIY to installation
HWV Facilities
One clear digital story for facility and industrial services
CLW Antwerpen
A warm school website for dual education, managed in Storyblok
What our clients say
A rotating selection of the reviews clients left on Google — Dutch reviews shown in English translation. An average of 4.9 out of 5 stars across 26 Google reviews (September 18, 2026).
Two years ago I started looking for someone who could help me with a website that scored well. In terms of approach, Seppe immediately made a good impression on me; he is patient (which I definitely need), professional, and transparent. You can always reach out to him with questions and he charges fair prices. Shortly after we first got in touch he launched a new website that I am very happy with, and he manages the SEO and SEA features to the best of his ability. As a proud ambassador of Straffe Sites, I look to the future with confidence!
Fast & perfect service.
A pleasant collaboration for 15 years now, with knowledge and skill at the center.
How we work together
Clear and personal: you always know where your project stands.
Introduction
An informal conversation about your business, your goals and your customers. You speak directly with the builder.
Design
A visual direction that fits your business, with room for your feedback.
Build
We build a fast, accessible and technically solid site. You see the progress as it happens.
Launch & support
After launch, we stay available for website maintenance, web hosting and next steps.
No agency. Just a senior team
At Straffe Sites, you work directly with the team. Seppe is your dedicated point of contact and builds your site; the team supports him where needed. No account managers or go-betweens.
- 20+ years of experience
- 1 dedicated point of contact
- Honest advice without a sales pitch
- Worldwide clients, delivered remotely
Keep reading
PHP2Shell: what the PHP flaw means for your WordPress site
Storyblok localization: how to set up a multilingual site
Outsourcing online marketing: when does it pay off?
How much does SEO cost in 2026?
MCP servers for CMS systems: AI agents in your CMS
How small agencies compete with big rivals in Google
Benchmark: how fast are the web agencies on page 1?
Lab vs field: what your PageSpeed score does and doesn't say
Why slow websites rank high in Google
Switching to Storyblok: a migration guide
Hire an Astro developer: what to look for
Implementing AI in your business: training, guidance, or outsourcing?
Hiring someone to build an AI agent: what to look for
Astro vs. Next.js: which framework fits your website?
Simple website: when less is more
What does an online store cost in 2026?
Web designer or web developer: who do you need for your website?
Hire a web developer: what to look for
Building a headless website: when it pays off (and when it doesn't)
A website without a CMS: Astro Content Collections in practice
Outsourcing website maintenance: what you get
Automating SEO with AI: build a self-improving loop
Website performance: improve your site speed in 9 clear steps
Add an RSS feed to Astro with Storyblok stories
Integrate Prettier with Astro and Tailwind CSS
Generate localized sitemaps for your Astro and Storyblok project
Setting up an Astro project with Svelte, Tailwind CSS, Vercel, Prettier, and TypeScript
Minifying Astro HTML after the build: how the script works
A guide to proper semantic markup for blog posts
Writing a blog with AI: the complete workflow from brief to measurement
The ideal blog post structure in 7 steps
What is a headless CMS, and what are its benefits?
Writing website copy with AI: a practical workflow
WordPress maintenance: what it involves and what it costs
How to set up Google Search Console: a step-by-step guide
How to find the SEO keywords of a website: 6 clear steps
Ranking higher on Google: improve your website step by step
Website development costs: what does a website cost in 2026?
Frequently asked questions
How much does a website from Straffe Sites cost?
That depends on your goals and the size of your project. During an initial conversation, we assess what you need and provide a clear, tailored quote.
How long until my site is ready?
It varies by project. Because you work directly with the developer, communication is quick. After our first conversation, you’ll get a realistic schedule.
Can I edit the content and pages myself?
Yes. Depending on your project, you manage your content in a headless CMS such as Storyblok or in structured files in Git, like our own site. We’ll show you how it works.
What happens after the launch?
We don’t disappear after launch. With website maintenance and web hosting, your site stays secure, fast and up to date, and you keep one dedicated point of contact. Every month, we measure 13 sites we built, including our own, with PageSpeed. In September 2026, each one reached a best mobile score between 94 and 100.
Do you also take care of web hosting?
Yes, if you want us to. We then manage hosting for your site: publishing, the SSL certificate and technical follow-up. You never have to maintain a server yourself. Email hosting isn’t automatically included. We map your existing mail settings before we change anything in your DNS.
Terms
Web terminology, explained briefly and clearly.
CMS
Software for creating, managing and publishing website content without editing source code for every change.
Responsive web design
A design and development approach that lets one website adapt to viewport size, device capabilities and input method.
Core Web Vitals
Three metrics that measure loading performance, interaction responsiveness and visual stability: LCP, INP and CLS.
SEO
Improving a website so search engines can find, understand and show relevant pages to people making related searches.
Web hosting
The infrastructure and services that store website files, run server processes, and make a website available online.
Website maintenance
Regular checks, updates, repairs, and improvements to website code, content, integrations, security measures, and performance.
Ready for a rock-solid site?
Tell us about your project. There’s no obligation after our first conversation, and you’ll get honest advice and a clear proposal.
Discuss your projectPrefer email? seppe@straffesites.com