Ondřej Šalajka
I design, deploy and fix network and security infrastructure — firewalls, access control, and the servers running behind them.
- Coverage
- All of Czech Republic — on-site and remote
- Core stack
- Fortinet, Cisco, Linux
What I do
I spend my time on the infrastructure layer: Fortinet and Cisco networks, NAC rollouts, mail security, and the Linux and virtualisation stack underneath. Most projects are one of two kinds — designing a solution before anything is bought, or coming in when something is already broken and needs to be fixed properly.
I work directly with the people who run the network, I explain the trade-offs before I change anything, and I leave documentation behind. No vendor pitch, no oversized design for a problem that doesn't need it.
Expertise
Network security
FortiGate firewalls, IPsec and SSL VPN, segmentation and policy design, FortiMail, FortiSandbox, Proofpoint email security.
Routing, switching & wireless
Cisco Catalyst and WLC, FortiSwitch and FortiAP, MikroTik, VLAN and campus design, troubleshooting down to packet level.
Access control & identity
Cisco ISE, FortiNAC, 802.1X for wired and wireless, certificate-based onboarding, guest and BYOD access.
Servers, virtualisation & monitoring
Windows and Linux administration, Proxmox, VMware, Nutanix AHV, Wazuh SIEM, central logging, backup and recovery.
Certifications
- Fortinet Certified Professional — Network SecurityFortinet
- PACSE — Accredited Certified Sales EngineerProofpoint
Contact
Tell me what's broken, or what you're planning to build. If I'm not the right person for it, I'll say so.