Position: DevOps engineer
Category: DevOps
English level: intermediate
Years of experience: 2

Brief description of what I have done before:

Managed Puppet+Hiera (created new/reconfigured old manifests, templates, hiera configs, both of static classes and module structure), created Puppet modules, managed Ruby facts, debug of catalogue compilation for specific target, and etc.

Experience in advanced iptables+ipset ruleset development that is supposed to run at environments with high packet rate, achieving this by tree structure of bpf-compiled rules and further optimization using Perf kernel API and source code checking.
CI Solutions: TeamCity, GitlabCI, Jenkins/Pipeline integrated with Kubernetes infrastructure on top of Google Cloud platrofm.

Monitoring: Datadog, Kibana, Prometheus, Nagios/OMD, Pakiti.

Networking: ECMP, NetNS, PBR, tc. BPF syntax. ip/nftables + ipset (advanced). Snort, Suricata, nDPI. Advanced tuning of network stack. nmap, Metasploit/Armitage, Shodan. Good understanding of network security.

Orchestration: Puppet (+Hiera), Ansible, Spacewalk (+CentOS Errata).

Advanced experience with LEMP stack, WAFs, L7 AntiDDoS (headers inspection, ratelimit zones, secure cookie).

Complex debugging using ftrace, strace, sysdig, gdb.

Familiarity on CPanel/Plesk internals.

Experience as L3 SA and as researcher about Linux internals.