Linux · Networking · Virtualization · IT Security
Retraining as Fachinformatiker für Systemintegration (IHK) at BFZ-Essen · 06/2026 – 06/2028
Looking for an internship in systems administration for my practical phase 09 Aug 2027 – 23 Jun 2028 · on-site in NRW or hybrid/remote · goal: staying on after my retraining
Contact: jeremy.njumbe1301@gmail.com · LinkedIn
homelab-portfolio: turning a used Lenovo ThinkCentre into a hardened Proxmox server, step by step. Every change comes with a verification step and a rollback plan.
| # | Project | Status |
|---|---|---|
| 01 | Hardware intake and BIOS/UEFI security baseline | ✅ published |
| 02 | Home network security baseline: router, Wi-Fi, lab switch | ✅ published |
| 03 | Proxmox VE deployment and access control (least privilege, 2FA, key-only SSH) | ✅ published |
| 04 | Network design and segmentation: VLANs, firewall between lab networks | planned |
lamp-server (in progress): Debian VM on Proxmox for Apache, MariaDB and PHP. Phase 0 done: ISO verified by checksum and GPG signature, static IP planned outside the DHCP range.
Next: network segmentation with VLANs and a firewall · Active Directory, DNS and DHCP · automation with Bash and PowerShell.
- Plan first: goal, risk and rollback idea before every change.
- Record the starting state, then change one thing at a time.
- Verify and log: every change gets evidence and a changelog line.
- No secrets in repos: passwords live in a password manager; only sanitized case studies are public.
| Area | Current level |
|---|---|
| Systems | Linux (Ubuntu), Windows 11, Bash, Proxmox VE (basics), KVM/libvirt |
| Networking | TCP/IP, IP addressing, DHCP, routing basics, structured troubleshooting |
| Security | BIOS/UEFI and system hardening, guest network isolation, installer verification (hash, signature), firewall rules (ufw), SSH keys, 2FA, encryption (LUKS, BitLocker) |
| Code & tools | Python (basics), Git and GitHub, documentation in Markdown |
- Retraining FISI (IHK), BFZ-Essen: operating systems, Linux and virtualization (grade 1 = top grade), networking, IT security
- Cisco Networking Academy: Junior Cybersecurity Analyst Career Path, Introduction to Cybersecurity, Networking Basics, Operating Systems Basics, Hardware and Upgrade Support
- Harvard CS50P: Introduction to Programming with Python
- python-umschulung: assignments from my retraining, reworked with test tables and lessons learned
Five years in sales and customer service, most recently placing IT freelancers in client projects. Aligning requirements with IT managers showed me that I'm more interested in the technology itself. What I bring from that time: listening to what users actually need and explaining technical solutions clearly.
Kurz auf Deutsch: Umschüler zum Fachinformatiker für Systemintegration (IHK) bei der BFZ-Essen, Schwerpunkt Systemadministration und IT-Sicherheit. Ich suche ein Praktikum für meine Praxisphase vom 09.08.2027 bis 23.06.2028, in NRW vor Ort oder hybrid/remote, gern mit Perspektive auf Übernahme. Deutsch und Englisch sind beide meine Muttersprache.