Homelab
A Proxmox server at home runs my self-hosted services. It is tied to the production VPS over Tailscale, so databases, dashboards and SSH never face the open internet. Only ports 80 and 443 do.
Gustav
Haavik
Software developer with a BSc in IT security
I'm Gustav. I build websites for clients (friends and family), desktop tools for my own hosting business and a voxel game in Rust. When I'm not coding, I'm playing guitar or soldering pedals in the corner of a 25 m² house in Aarhus.
About me
Software development, networking and IT security are the things I dig into. In June 2026 I finished a bachelor’s in IT security, built on top of a computer science degree (datamatiker).
I grew up in a home where music and creativity were always around. When I’m not tinkering with a side project, I’m practising guitar or training with a friend. In a corner of my small house I build electronics, mostly guitar pedals, when there’s time and money for it.
I’m a bit of an introvert, though my friends don’t always see me that way. When the day is over I’m happy making smashburgers, and on Fridays I’m out for a Guinness.
- Based in
- Aarhus, Denmark
- Languages
- Danish (native), English (fluent)
- Graduated
- June 2026, BSc in IT security
Selected work
Client sites, my own products and a game. Pick a project for the full story and more pictures.
- HotelHunger Website and merch shop with a music player, tour dates and a cart.
- Kyllingeklubben A private Danish forum with invite codes, an admin panel and a shared photo gallery.
- Johan's Place Site for a music artist: services, collaborations, video and socials.
- BjertYoga One-page site for hatha and yin yoga on a farm in Sdr. Bjert.
- Bartendr Website for a made-to-measure bar service for parties.
- Wyvencraft An open-source voxel survival game in Rust and Vulkan, with its own launcher and accounts.
- PartForge Desktop app for an electronics workshop: parts inventory, build projects and an AI assistant.
The workbench
What I build and run when no one is paying me to.
Grafana watches everything
Prometheus scrapes every host and container, Loki collects the logs, and blackbox probes check that each client site answers. Grafana breaks it all down per client, and Alertmanager tells me before a client notices something is wrong.
- Grafana
- Prometheus
- Loki
- Alertmanager
- Blackbox exporter
- Proxmox
- Tailscale
- Coolify
The electronics corner
Same corner, three different years. Move the slider.
(Aarhus) The corner today. You have to make use of the small space in a 25 m² house.
Guitar
Music has always been part of home. Guitar is what I reach for when I need to think about something other than code, and it is the reason I started building pedals.
Working with AI agents
I’m very good at agentic AI workflows. Not autocomplete, but agents that plan, write, test and review code while I set the direction and make the calls.
Skills that remember the project
My larger projects each have their own Claude Code skills holding the architecture, the business rules and the traps. A fresh agent starts out knowing what took me weeks to learn.
Agents with narrow jobs
Planning, implementation, code review and security review run as separate agents, often in parallel, so each one does one thing well.
Tests as the guardrail
Agents write the tests first and work until they pass. A model reviewing its own code has blind spots, so I keep checks it cannot talk its way around.
AI inside the product
At Dynamicweb I built an OpenAI-based feature that suggested matches between external API fields and database columns. PartForge has an optional assistant grounded in your real inventory.
Experience and education
Work
- 2026
Software developer, internship and student job
OPARKO
Built and documented the company’s admin platform across the stack: React and Tailwind CSS on the frontend, Go and MySQL on the backend, plus work on their React Native app.
Penetration tested the products and worked with the infrastructure hosted on AWS.
- 2024–2025
Backend developer, internship
Dynamicweb Software
Wrote .NET/C# and ASP.NET every day, focused on integrations with external organisations’ databases.
Mapped API responses from external systems onto our own data model, and built an OpenAI-based feature that suggested matches between source fields and database columns.
Education
- 2025–2026
BSc in IT security
Erhvervsakademi Aarhus
Cyber security, risk management and secure architecture, built on the computer science degree. Designing secure systems, penetration testing and IT governance to current standards.
- 2022–2025
Computer science (datamatiker)
Erhvervsakademi Aarhus
A 2½-year degree in systems development, programming and operations. Software architecture, databases, Java and C#.
- 2018–2021
HTX, game development
Viden Djurs, Grenaa
Programming and communication/IT.
Skills
- Languages
- Go
- TypeScript
- JavaScript
- C#
- Rust
- Java
- SQL
- Frameworks
- SvelteKit
- Svelte 5
- .NET / ASP.NET
- React
- React Native
- Expo
- Wails
- Tailwind CSS
- Databases
- PostgreSQL
- MySQL
- SQLite
- Drizzle ORM
- Infrastructure
- Docker
- AWS
- Coolify
- Proxmox
- Tailscale
- CI/CD
- Grafana
- Prometheus
- Security
- Penetration testing
- Secure architecture
- Risk management
- AI
- Claude Code
- Agentic workflows
- OpenAI integration
Want my CV?
Tell me who you are and the full CV lands in your inbox as a PDF. I get a short note that you asked, so I know who to expect.
Get in touch
The quickest way to reach me is a message on LinkedIn or an email.