Calvin · IT, security and websites for small businesses

Safer, smarter, and independent online.

  • Secure by default.
  • Open-source where it counts.
  • Self-hosted where it matters.
  • Documented and maintainable.

I build websites and web shops, help you get found, and get small-business IT safe and in order. On open-source and self-hosted tech, so you stay the owner of your site and your data.

See the services Free tools

For everyone: free tools and guides on privacy and security.

What I stand for

Take back control of your digital life.

Most of our data and daily tools sit with a handful of US tech giants. Convenient, until it isn't. I help people and businesses become safer, more private and less dependent.

  • Private by default

    Know where your data lives and who can access it. No profiles or ad trackers, no unnecessary storage, sensitive data under your own control.

  • Open & independent

    Open-source, European and self-hosted alternatives to big tech where they genuinely work. No dogma—just a clear view of your options.

  • Aware, not afraid

    Online risks explained calmly: from phishing to everyday vulnerabilities. Always paired with a concrete step you can take.

Read what I stand for How to become less dependent on big tech

Specializations

Broad where needed, deep where it counts.

Six disciplines that overlap in any small business, with one point of contact.

  • Cybersecurity

    E-mail security, accounts and 2FA, security headers, and backups tested to restore. Plus plain-language guides to spot scams early.

  • IT infrastructure

    Servers, networks and self-hosting, set up redundantly with open-source tools so work keeps running if something fails.

  • AI and automation

    Replacing recurring manual work with scripts, integrations and AI where the time saved can actually be measured.

  • Web development

    Fast websites and web shops built with Astro, MedusaJS and Tailwind—no bloated templates or plugin chaos.

  • SEO and findability

    Technical SEO, local search and an accurate Google Business Profile. A great site only pays off when people find it.

  • Marketing and design

    Clear copy, branding and design that match the quality of the tech underneath.

The approach

Three focus areas.

Whether you use the free tools or work with me as a business: everything here makes your setup safer, smarter or easier to find.

  • Safe

    Phishing, data leaks and weak spots. Find where the risk is, then fix it.

    • E-mail that is hard to forge
    • Accounts with 2FA and proper password management
    • Backups that are tested to restore
    Test your e-mail domain

  • Smart

    Less manual work and fewer overlapping subscriptions. Automation and AI where the gain can be measured.

    • Automating recurring tasks
    • Removing duplicate software
    • Clear advice on what is worth automating
    Calculate what manual work costs

  • Findable

    Websites that are fast, technically sound and easy to find.

    • Fast, maintainable websites
    • Technical and local SEO
    • An accurate Google Business Profile
    See the services

For businesses

Work together.

I help small businesses in the Netherlands get a clear picture of their IT: what works well, where the risks are, and where time or money can be saved.

Services are in Dutch for now

How the IT-scan works

  1. Questionnaire and intake

    A short questionnaire and a one-hour call or visit.

  2. Automated checks

    E-mail, domain, SSL and website are checked automatically.

  3. Report and review

    A traffic light per item, and a clear list of next steps.

Free resources

Free tools and guides.

Tools

Security tools that run in your browser.

Check your e-mail domain, inspect a suspicious link or generate a strong passphrase. Nothing is stored.

See the tools

Knowledge

IT and security in plain language.

Practical guides on e-mail security, backups, 2FA and open-source alternatives, with steps you can follow yourself.

Read the guides

Lab

What I build and tinker with.

Open-source utilities, work projects and personal experiments, with notes on how they work.

Visit the Lab

New on the site

Recently written.

Go to the blog

  1. What this site measures, and why nobody can be identified in it

    This site now keeps statistics on how it's used, with Umami on my own server. What exactly I see, why it isn't Google Analytics, and why that data is never sold or shared. Blog · 3 min read

  2. Why I run my own cloud (and why you don't have to)

    My files, passwords, calendar and contacts live on servers I manage myself. Why I do it, what it costs in time and care, and what you can take from it without setting up a server yourself. Blog · 3 min read

  3. Why the first three IT scans are free

    I'm starting a new service, the IT scan, and I'm doing the first three for free. Not as bait, but because I want to know the scan really helps before I put a price on it. What you get, and what I ask in return. Blog · 2 min read

Who I am

One specialist, the whole stack.

I'm Calvin. I started out rooting phones; today I build complete IT environments, advocate for open-source, and self-host my own cloud. Working across infrastructure, code and security means solving problems where they start.

  • Proxmox
  • OPNsense
  • Docker
  • Traefik
  • WireGuard
  • Linux
  • Grafana
  • Go
  • Python
  • TypeScript
  • Astro
  • n8n

More about Calvin

Contact

Want your IT reviewed?

Send an e-mail about what your business does, and you'll get a direct, honest answer from me.

info@cvdz.digital