● jnb.service - Portfolio & CV Service
Loaded: loaded (/etc/systemd/system/jnb.service; enabled; vendor preset: enabled)
Active: active (running) since Fri 1999-02-05 12:00:00 CET; 240320h ago
Main PID: 1337 (sysadmin)
Tasks: 1 (limit: 4915)
Memory: 256.0K
CPU: 0.02s
CGroup: /system.slice/jnb.service
└─1337 /usr/bin/jan --focus="Infrastructure & Linux"
Jul 02 20:55:23 systemd[1]: Starting Portfolio & CV Service...
Jul 02 20:55:24 jan[1337]: SYSTEM: Booted successfully.
Jul 02 20:55:25 jan[1337]: INFO: Welcome to my portfolio.
Jul 02 20:55:25 jan[1337]: INFO: Focus: Linux Admin / Virtualization / Networks
Jul 02 20:55:26 jan[1337]: [auth] Connection established from 216.73.217.123
IT Infrastructure & System Integration // Dortmund
I plan, implement, and operate IT infrastructures with a focus on stability, security, and structured documentation. Specialized in Debian GNU/Linux, Proxmox virtualization, OPNsense network structures, and Docker operations.
As a system integration specialist, I see my task in designing IT infrastructures so that they not only function on the day of setup, but remain understandable, scalable, and maintainable years down the road.
I work in a pragmatic and solution-oriented manner. In the event of system faults, I rely on structured troubleshooting from the physical layer up to the application. Clean documentation (Infrastructure as Code, network diagrams, and precise runbooks) is not an annoying extra for me, but the foundation of any stable operation.
In addition to my professional work, I operate an extensive homelab. Here I test new technologies, simulate network segmentation, and evaluate open-source alternatives under realistic conditions.
Setup, hardening, and maintenance of server infrastructures. Experience with virtualization (Proxmox VE, KVM/QEMU, VMware ESXi), containerization with Docker, and automation via Bash scripting and Ansible.
Administration of Linux distributions (Arch Linux, Debian, Ubuntu Server, Alpine). Proficient with the terminal, SSH, Systemd, nginx/Caddy as reverse proxies, DNS systems (Bind9, Pi-hole, AdGuard Home), and storage solutions (NFS, Samba, ZFS).
Practical experience with network architecture and segmentation. Configuration of VLANs, IP routing, VPNs (WireGuard, OpenVPN), firewalls (OPNsense/pfSense, iptables/nftables), and access points in the UniFi ecosystem.
Structured 1st/2nd level IT support, troubleshooting on-site and remote. Support and integration of point-of-sale systems (POS), peripherals, and event IT infrastructure in live environments.
Setup and operation of a segmented network and virtualization environment based on Proxmox VE. Connected via OPNsense firewall with dedicated VLANs for IoT, clients, and servers. Monitoring with Uptime Kuma and Prometheus.
Planning and execution of migrating a Windows Server 2012 R2 Active Directory and DNS structure to a modern server OS. Includes FSMO role transfer, DHCP migration, and DNS cleanup.
Setup of a monitoring solution for server health and network load. Visualization of metrics in Grafana dashboards. Alerts on service downtime or storage shortages via Discord/Telegram webhooks.
Physical and logical integration of IP security cameras (NVR) and IoT systems. Isolation of devices in separate VLANs without WAN access, securing remote access via dedicated WireGuard VPN.
Configuration of a Linux workstation for daily tasks and technical audio processing. Optimization of audio latency via PipeWire, virtualization of Windows test systems via KVM/QEMU with GPU passthrough.
Scripts, automation playbooks, and detailed markdown documentations from my homelab projects are continuously prepared and published on GitHub.
| Preferred Roles: | IT Infrastructure, Linux Administration, Support Engineering |
| Location: | Dortmund & Ruhr area (on-site / hybrid), Remote (Germany-wide) |
| Availability: | Short-term by arrangement |
| Communication: | Easiest via Email (jan-niklas.becker@example.com) or LinkedIn. |