About
Justus-Constantin Weidhaus.
Freelance IT consultant. I make the systems a business runs on behave like one.
I’m a freelance IT consultant based in Viereth-Trunstadt, Germany, with over a decade of hands-on experience running the systems businesses depend on every day.
My focus is the “integration layer” — the place where identity, communication, projects and data meet. Most companies don’t struggle because of bad tools; they struggle because those tools were never designed to work together. That’s the problem I solve.
What I do
I design, connect and operate Google Workspace and Microsoft Entra environments, build custom integrations across Slack, Atlassian, Microsoft 365 and Google Workspace, and develop internal tools and SaaS for operational teams — increasingly with AI in the mix.
- Certified Google Workspace administration
- Microsoft Entra identity & access
- Automation and API integrations (Slack, Atlassian, M365, Google)
- Custom software, dashboards and AI copilots
- Hosting, domains, security and day-to-day IT
How I work
My focus isn’t “admin work” — it’s reliability, security and scalability. I bring ownership, structure and clarity to environments that grew organically, and I document what I build so it doesn’t depend on any one person’s memory.
Systems should support the work, not create friction. That’s the standard I build to.
If your tools don’t talk to each other yet — or you know they could do far more — that’s exactly the kind of work I like most.