- Development: Linux API (network subsystem/userspace), middleware (Kubernetes CNI).
- CI Solutions: TeamCity, Jenkins/Pipeline, GitlabCI.
- Monitoring: ELK stack, Prometheus, Datadog, Nagios/OMD, Pakiti. Background in tuning ELK stack for high throughput & indexing speed.
- Networking: ECMP, NetNS, PBR, tc. BPF syntax. ip/nftables + ipset (advanced). Snort, Suricata, nDPI. Network stack tuning for specific purposes.
- Orchestration: Ansible, Octopus Deploy, Puppet (+Hiera), Spacewalk (+CentOS Errata).
- Advanced experience with LEMP stack, WAFs, L3-L7 AntiDDoS (custom builds, headers inspection, ratelimit zones, secure cookie).
- Complex debugging using ftrace, strace, sysdig, gdb. Background in debugging .NET software using Procmon & CLR profiler.