┌─ ~/whoami ─────────────────────────────────────────────┐

Sebastiaan Koetsier

$ cat /etc/motd

Network engineering leader. I build infrastructure that doesn't page you at 3am. 20+ years in routing, switching, Linux, BSD, and making complex systems simple. Currently at Worldstream — Solid IT, No Surprises.

└──────────────────────────────────────────────────────────┘

┌─ ~/projects ────────────────────────────────────────────┐

gorancid v0.4.16 ● active

Go rewrite of RANCID. Collects network device configs over SSH/Telnet, stores diffs in git, emails changes. Drop-in replacement — same config files, same cron jobs, no Perl dependency. All collection in-process, no Expect remaining.

go ssh networking git mit

→ project details

PhreakBot v0.1.32 ● active

Modular IRC bot. Quote database, channel management, peering LAN tools (Frys-IX), ROA validation, MAC vendor lookup. Python + PostgreSQL, runs in Docker or Podman.

python irc postgresql docker mit

→ project details

└──────────────────────────────────────────────────────────┘

┌─ /etc/skills.conf ──────────────────────────────────────┐

routing/switching → bgp ospf is-is mpls
linux → debian ubuntu rhel alpine
bsd → freebsd openbsd
go → cli tools api servers networking
python → bots automation tooling
virtualization → vmware vcp410 proxmox kvm
leadership → teams mentoring architecture
philosophy → cloud repatriation data sovereignty

└──────────────────────────────────────────────────────────┘

┌─ ~/career.log ──────────────────────────────────────────┐

2025→ Worldstream — Naaldwijk, NL
→ Dublin · Singapore · Denver, Colorado
→ Rotterdam · Maassluis · Tilburg · 's-Hertogenbosch
1999→ Started in networking

certs: People Leadership Credential (2025)
langs: nl en de

└──────────────────────────────────────────────────────────┘

┌─ ~/.motd ───────────────────────────────────────────────┐

Infrastructure should be simple, owned, and boring.
Keep the cloud optional. Keep the data yours.

└──────────────────────────────────────────────────────────┘