Hi! I’m Daniel - a Computer Science Engineer working in Network Security and DevOps.

Experience#

Network Security Engineer - Magyar Telekom Nyrt. (external employee), 2021-2026

  • Operating and troubleshooting enterprise firewalls (Juniper SRX, Cisco ASA / Firepower)
  • Anti-DDoS operations with Radware and Netscout Sightline
  • DevOps on Linux: in-house management applications and their integrations with other systems
  • Migrations, monitoring and log management (TIG, VictoriaMetrics / VictoriaLogs)

Network Engineer (Trainee) - Magyar Telekom Nyrt., 2018-2021

  • Fundamentals of enterprise networking on production infrastructure
  • Network cleanups and documentation
  • Automation scripts and in-house applications

Education#

  • BSc in Computer Science Engineering, Óbuda University
  • Church musician, with certificate, HAKK

Tech skills#

Python
In daily use for network automation, data processing and web programming. (Flask, Django)
Linux
Installing and maintaining GNU/Linux servers and desktops - Fedora, RHEL, Alpine, Debian. Managing updates, and vulnerabilities. Currently daily driving Fedora / Silverblue. Self-hosting on AlmaLinux.
Network
Experience in operating Juniper SRX and Cisco ASA / Firepower firewalls and Mikrotik, IOS, IOS-XR network devices. Lab/homelab experience with pfSense, OPNsense, VyOS, OpenWRT and Linux networking and filtering.
Anti-DDoS and Network security
Managing Radware and Netscout anti-DDoS solutions. DNS sinkholing for large lists via a self-developed application written in Go.
Containers
Docker and Podman - app containerization, used for self-hosting and homelab via quadlets and systemd.
Cloud
AWS and IaC (Terraform, Terragrunt, Ansible).
Monitoring & log management
Setting up monitoring using Telegraf, Nagios NRPE, InfluxDB, Grafana (TIG) stack and VictoriaMetrics / VictoriaLogs. Creating measurements from multiple sources such as SNMP, syslog and JSON. Visualization using Grafana dashboards and panels.
Android
Java and Kotlin applications for smaller projects. Translations, contributions and modifications in open-source projects.
Git
Daily use for code, configuration and infrastructure repositories (GitLab). Introduced Git-based workflows to my team.
AI-assisted work
LLM tools (chat assistants and coding agents) for development, documentation, code review with human in the loop and spec. driven methodology. Experimentation with small local models and ai workflows.
Office tools
ECDL certified. Proficient with Microsoft Office / LibreOffice for documentation, reporting and spreadsheets.

Languages#

  • Hungarian - native
  • English - B1 (intermediate); used daily in a professional environment, no formal certification
  • German - C1 certified; strong reading, writing and listening comprehension, conversational fluency currently out of practice