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Karl "Zeadar" Alexandersson

Looking for backend, systems, Linux tooling, internal tools, or C/Rust-adjacent developer roles.

Open Curriculum Vitae

About

Software developer with professional experience building JavaScript-based interactive applications, frontend interfaces, internal tools, Node.js services, and 3D features with Three.js.

I am currently focused on backend and systems development, especially C, Rust, Linux tooling, networking, automation, and command-line/system utilities. I enjoy building practical software that solves concrete problems close to the operating system.

I use AI-assisted workflows to speed up code exploration, debugging, refactoring, and documentation while keeping responsibility for design and correctness.

Featured Projects

blocktimer

Linux firewall scheduler written in C for blocking domains, IPs, and CIDR ranges during configured time windows.

github.com/Zeadar/blocktimer

netblocker

Small Linux daemon that blocks outbound IPv4/IPv6 traffic on a schedule and handles wake/sleep events.

github.com/Zeadar/netblocker